US20200345904A1 - Aspiration control valve - Google Patents
Aspiration control valve Download PDFInfo
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- US20200345904A1 US20200345904A1 US16/400,221 US201916400221A US2020345904A1 US 20200345904 A1 US20200345904 A1 US 20200345904A1 US 201916400221 A US201916400221 A US 201916400221A US 2020345904 A1 US2020345904 A1 US 2020345904A1
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- Prior art keywords
- catheter
- valve
- side port
- aspiration
- control
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Definitions
- the present invention generally relates to intravascular medical treatments, and more particularly, to regulating aspirated blood flow rate during a thrombectomy procedure.
- a physician can utilize a syringe or a vacuum pump to obtain reverse blood flow to aid in dislodgement and retrieval of a blood clot or thrombus in conjunction with a stentriever or for direct aspiration into an Intermediate or Access Catheter.
- the syringe or vacuum pump can be connected to the proximal end of the Intermediate or Guide Catheter (e.g. Balloon Guide Catheter) and the vacuum can communicate with the distal tip of the catheter through the lumen of the catheter.
- the syringe and vacuum pump are typically connected to the side arm of a “Rotating Hemostasis Valve” which is attached to the proximal end of the Intermediate or Guide Catheter.
- “Rotating” refers to a luer connection which can be screwed onto the proximal end of the catheter and can be free to rotate for ease of attachment, while the hemostasis feature facilitates the introduction of other catheters and accessory devices through the Intermediate or Guide Catheter while minimizing back bleed and blood loss.
- the hemostasis valve typically contains a gasket which may be fully open for device introduction or tightened to prevent any blood loss. The gasket can also be tightened to grip a guidewire or microcatheter which is positioned inside the Intermediate or Guide Catheter.
- Known hemostasis valves typically include an entrance passageway for receiving the accessory devices or catheters in a hemostatically sealed condition and a side port which can be used for connecting a saline flush, injections such as contrast media or to which the aspiration syringe or vacuum pump can be attached.
- Known hemostasis values can also include a passageway through which a guidewire, microcatheter, Intermediate Catheter, device shaft, or such elongated member can pass.
- the passageway can include a gasket for hemostatically sealing the exterior perimeter of the inner elongated member to minimize blood loss and grip the inner elongated member in position where required.
- a syringe or vacuum pump can provide suction through a lumen of an Intermediate or Guide Catheter to produce reverse blood flow at the blood clot.
- a vacuum pump When a vacuum pump is used, it is typically set to maximum and applies full vacuum/aspiration as the clot is being retrieved. Similarly, if a vacuum lock syringe is used, full vacuum is typically applied to give the maximum reverse flow rate for as long as possible until the syringe is full.
- a physician can desire to modify the aspiration rate during the procedure to suit specific aspects of a clinical case. For example, during a thrombectomy, a physician might prefer to aspirate slowly on initial clot dislodgement, then increase suction when the clot is approaching the catheter, and then further increase suction to maximum when pulling the clot into the catheter. Increasing aspiration during clot retrieval can reduce the chance of vessel collapse due to negative pressure in the vasculature, and when performed with a syringe, can more effectively utilize the fixed volume of the syringe compared to a steadily applied vacuum. This technique requires simultaneous manipulation of the syringe or pump, retraction of the thrombectomy device, and stabilization of the catheter, which can be extremely difficult with traditional systems.
- an object of the present invention to provide systems, devices, and methods to meet the above-stated needs.
- an aspiration control device having an aspiration control valve controllable by a switch, button, slider, trigger, grip, lever, rotating wheel, rotating valve, handle or other interface that is conveniently positioned and configured to be manipulated while simultaneously stabilizing a hemostasis valve and catheter in one hand and/or retracting an elongated member with the other hand.
- the aspiration control device can be integrated into a hemostasis valve, integrated into a wire gripping device, and/or attached to an inlet, outlet, hose, pump, or syringe in series with an aspiration flow path.
- Systems for aspirating blood flow during an intravascular procedure can include combinations of one or more aspiration control devices, one or more hemostasis valves, one or more wire gripping devices, and/or one or more vacuum sources to provide and/or regulate vacuum to one or more catheters.
- An example system can include a hemostasis valve, a control valve, and a control interface.
- the hemostasis valve can have an entrance for receiving a catheter.
- the control valve can be in communication with the hemostasis valve and can have an opening resizable from a first dimension to a second dimension, the first dimension sized to limit flow of aspirated blood from the catheter at a first flow rate, and the second dimension sized to limit flow of aspirated blood from the catheter at a second flow rate.
- the control interface can be in communication with the control valve, and the control interface can be movable to move the opening of the control valve from the first dimension to the second dimension.
- the hemostasis valve can further include a side port.
- the control valve can be positioned approximate the side port.
- the control valve can be positioned to prove a flow path for the flow of aspirated blood, the flow path extending from the catheter, through the control valve, and to the side port.
- the control valve and the control interface can be integrated with the hemostasis valve in a common housing.
- the control interface can be positioned to allow a user to select one of the first flow rate or the second flow rate with a single hand while stabilizing the catheter with the same hand.
- the control interface can be a button configured to select at least one of the first flow rate or the second flow rate based at least in part on a force applied to the control interface.
- the opening of the control valve can be movable through a continuum of dimensions between the first dimension and the second dimension such that flow of aspirated blood is controllable over a continuum of flow rates between the first flow rate and the second flow rate.
- the control interface can be movable through a continuum of positions to move the opening of the control valve through the continuum of dimensions.
- the control interface can be spring loaded and can be set in a default open or default closed position or be ratcheted to be set at any interim position between fully open and fully closed.
- the hemostasis valve can further include an exit sized to pass an inner elongated member, a seal disposed near the exit, a locking actuator displaceable to open, semi-open, or close the seal, and a hemostatic indicator movable to provide a visual indication of a position of the locking actuator.
- the inner elongated member can be disposed within a lumen of the catheter.
- the locking actuator can be displaceable from a first position, a second position, and a third position, each position corresponding to the open, semi-open, or closed state of the seal respectively.
- the hemostatic indicator can be movable to indicate which position the locking actuator is currently in.
- the inner elongated member When the locking actuator is in the semi-open position, the inner elongated member can be retracted or moved in the catheter while the seal provides sufficient sealing to prevent air ingress when vacuum is applied to the side port during aspiration.
- the inner elongated member can be a microcatheter and a stentriever can be retracted to retrieve the clot into the catheter when the catheter is under full vacuum without air leakage through the seal of the locking actuator.
- An example apparatus can include a distal port, a proximal port, a first side port, a first flow path, a control valve, and a control interface.
- the distal port can be sized to receive a catheter.
- the proximal port can be sized to allow passage of an inner elongated member, the inner elongated member being disposed within a lumen of the catheter.
- the first flow path can extend from the lumen of the catheter to the first side port.
- the control valve can be in communication with the lumen of the catheter and the first side port, and the control valve can be movable to control blood flow through the first flow path.
- the control interface can be in communication with the control valve, and the control interface can be movable between at least two positions, the at least two positions corresponding to at least two flow rates of the blood flow through the first flow path.
- the control interface can have a slide button positioned to allow a user to simultaneously select one of the two or more positions with a single hand while also stabilizing the catheter with the single hand.
- the control interface can have a push button, and the push button can be pushed by a force to move the push button between the two or more positions while simultaneously stabilizing the catheter with the single hand.
- the apparatus can further include a second side port and a second flow path.
- the second flow path can extend from the second side port to the first side port.
- the control valve can be in communication with the second side port and the first side port, and the control valve can be movable to control the blood flow through the second flow path.
- An example method for aspirating blood flow can include some or all of the following steps and variations thereof. The steps are recited in no particular order.
- a hemostasis valve having a distal port and a side port can be provided.
- An aspiration control device having a control valve and a control interface can be provided. The aspiration control device can be positioned approximate the side port.
- the hemostasis valve and the aspiration control valve can be disposed in a common housing.
- a flow path from a lumen of a catheter positioned in the distal port to the side port can be provided.
- the control valve of the aspiration control device can be positioned in the flow path.
- a flexible tubing having an opening can be positioned in the flow path.
- a housing having an opening can be provided.
- the flexible tubing can be positioned in the housing.
- a compression element in communication with the control interface can be provided.
- the compression element can be positioned to engage the flexible tubing.
- the compression element can be positioned in the opening in the housing. The compression element can be moved to resize the opening of the flexible tubing by manipulating the control interface.
- the catheter can be provided, and the catheter can be positioned in the distal port.
- a vacuum source can be provided.
- a vacuum can be provided to the flow path with the vacuum source.
- the control interface can be manipulated to control a flow rate through the flow path.
- a force can be applied to the control interface and the control interface can be moved from an initial position by applying the force to the control interface.
- the catheter can be stabilized with a first hand while simultaneously manipulating the control interface with the single hand.
- the control interface can be released.
- the control interface can be returned to the initial position.
- FIG. 1 is an illustration of an aspiration control device connected to a hemostasis valve according to aspects of the present invention
- FIG. 2 is an illustration of an aspiration control device with a sliding interface integrated into a hemostasis valve according to aspects of the present invention
- FIG. 3 is an illustration of an aspiration control device with a push button interface integrated into a hemostasis valve according to aspects of the present invention
- FIG. 4 is an illustration of a system including an aspiration control device connected to regulate aspiration at two hemostasis valves according to aspects of the present invention
- FIG. 5 is an illustration of a system including an aspiration control device integrated into a wire gripping device according to aspects of the present invention
- FIG. 6A through 6C are illustrations of an aspiration control device with a trigger, a locking actuator, and a hemostatic indicator integrated into a hemostasis valve according to aspects of the present invention
- FIG. 7A is an illustration of a locking actuator according to aspects of the present invention.
- FIGS. 7B through 7I are illustrations of hemostatic indicators according to aspects of the present invention.
- FIGS. 8A through 8D are illustrations of an aspiration control device with a trigger finger grip interface integrated into a hemostasis valve according to aspects of the present invention
- FIGS. 9A through 9C are illustrations of an aspiration control device with a two-finger grip interface integrated into a hemostasis valve according to aspects of the present invention.
- FIGS. 10A through 10C are illustrations of an aspiration control device with a lever interface integrated into a hemostasis valve according to aspects of the present invention
- FIGS. 11A through 11F are illustrations of two variations of an aspiration control device with a thumb trigger interface integrated into a hemostasis valve according to aspects of the present invention
- FIG. 12 is an illustration of an aspiration control device with a side grip interface integrated into a hemostasis valve according to aspects of the present invention
- FIGS. 13A through 13E are illustrations of blood flow indicators for an aspiration control device according to aspects of the present invention.
- FIGS. 14A through 14D are illustrations of an aspiration control device controlled by a push button interface integrated into a hemostasis valve according to aspects of the present invention
- FIG. 15 is an illustration of an aspiration control device controlled by a switch interface according to aspects of the present invention.
- FIG. 16 is an illustration of a system including two aspiration control devices configured to regulate aspiration at two hemostasis valves with only one vacuum source according to aspects of the present invention
- FIG. 17 is an illustration of an aspiration control device with an electrical actuation interface
- FIGS. 18 through 21 are flow diagrams each including method steps for controlling aspiration during a thrombectomy according to aspects of the present invention.
- Examples disclosed herein can generally include an aspiration control apparatus or device used together with a hemostasis valve to allow a physician to more easily vary a flow rate of aspirated blood during an intravascular treatment compared to some traditional systems.
- the aspiration control device can include a control valve in a flow path of aspirated blood and an interface for moving the control valve to regulate a flow rate through the flow path. Controlling the flow rate at the control valve can control reverse blood flow at a treatment site. For example, a flow rate of a reverse blood flow around a blood clot can be varied during a thrombectomy procedure by manipulating the aspiration control device.
- the aspiration control device can be positioned at various locations and have various configurations of control interfaces to achieve greater ease of use compared to traditional systems.
- the aspiration control device can be a stand-alone assembly that is connectable to a side port of a hemostasis valve, the aspiration control device and hemostasis valve can be integrated as a single assembly, or the aspiration control device can be integrated with a secondary device such as a wire grip device.
- the interface for moving the control valve can move between two or more discrete positions or over a continuum of positions.
- the control valve can be movable between two or more discrete positions or over a continuum of positions in response to positioning the interface.
- the regulated flow rate through the control valve can be adjusted by the movement of the control valve.
- the interface can include a mechanical interface such as a slider, push button, switch, wheel, trigger, grip, lever, rotating valve, handle, etc., the interface can be positioned to allow the physician to adjust the flow rate while simultaneously stabilizing a Guide Catheter or sheath with only a single hand, leaving the physician's second hand free for other activities such as withdrawing a stentriever and microcatheter.
- the interface can be designed to function similar to valves already known to physicians, such as a rotating valve, to provide a more intuitive interface.
- the aspiration control device can additionally include an electrical actuator that can be programmed to provide specific waveforms or aspiration flow patterns.
- Some example systems having purely mechanical aspiration control device and some example systems which additionally include an electrical actuator can be used to switch on or off the vacuum to allow the vacuum to build to give sudden and significant pressure changes in the catheter to help get improved engagement and removal of challenging thrombus.
- the control valve can have various orientations to regulate blood flow through the control valve.
- the control valve can include a section of compressible tubing that can be compressed by manipulating the aspiration control device interface.
- the valve can be in a normally open, non-compressed state when not being manipulated and can compress to restrict flow as a result of manipulation of the interface, the valve can be in a normally closed, compressed state when not being manipulated and can expand to increase flow as a result of manipulation, or the valve can retain its last state of compression, possibly a partially compressed state, when not manipulated and moved to a different retainable state as a result of manipulation.
- a spring-loaded control valve can be designed as a normally open or normally closed valve, and a rotating valve can be designed as a state retaining valve.
- the aspiration control device can be designed to be used together with two hemostasis valves, the first hemostasis valve providing a suction path for the Guide Catheter, and the second hemostasis valve providing a suction path for the Intermediate Catheter.
- the aspiration control device can simultaneously regulate vacuum through the Guide Catheter and the Intermediate Catheter through connections to both the first and second hemostasis valves.
- An advantage of this configuration is the ability to provide suction at two hemostasis valves with a single vacuum source (e.g. single pump or syringe).
- a second aspiration control device can be used together with the two hemostasis valves and the first aspiration control device, and the second aspiration control device can be connected to the single vacuum source through the first aspiration control device. Configured thusly, two catheters can simultaneously receive suction from the single vacuum, with differing vacuum pressures.
- the aspiration control device can be designed as integrated into a secondary device that can be used in conjunction with a hemostasis valve.
- the aspiration control device can be integrated into a wire grip device, allowing a physician to use a single hand to control the rate of aspiration while simultaneously retracting a thrombectomy device and/or microcatheter, leaving the physician's second hand free for other activities such as stabilizing a Guide Catheter.
- FIG. 1 is an illustration of an example system 100 including an aspiration control device 120 and a hemostasis valve 160 .
- FIG. 1 illustrates the aspiration control device 120 as a stand-alone device that is connectable to a side port 166 of the hemostasis valve 160 and connectable to tubing 112 of a vacuum system.
- An advantage of the stand-alone aspiration control device 120 is that it can be configured to mate with a traditional hemostasis valve 160 .
- a catheter 102 can be received by an entrance 162 of the hemostasis valve 160 , and the aspiration control device 120 can be positioned in a flow path from the catheter 102 , through the side port 166 of the hemostasis valve 160 , and out through the tubing 112 to the vacuum system.
- the aspiration control device 120 can have an internal valve that can be adjusted by moving a control interface or actuator 140 .
- the aspiration control device 120 can include a flow rate indicator 152 to provide a visual indicate of a rate of blood flow through the aspiration control device 120 .
- the aspiration control device 120 can be positioned so that a physician can adjust the flow rate through the flow path with the interface 140 while simultaneously stabilizing the Guide Catheter 102 and extracting a pull wire, shaft of a thrombectomy device, or other inner elongated member 108 from an exit 164 of the hemostasis valve 160 .
- FIG. 2 is an illustration of an example system 200 including an aspiration control device 220 integrated with a hemostasis valve 260 .
- the integrated aspiration control device 220 and hemostasis valve 260 can be integrated into a common housing.
- the integrated apparatus can have an entrance 262 with a luer connection to receive and hemostatically seal a catheter 202 , an exit 264 sized to allow passage of an inner elongated member 208 and adjustable to hemostatically seal the inner elongated member 208 , a side port 266 designed to connect with a vacuum system, a control interface 240 for manipulating the control valve to regulate aspirated blood flow, and a visual indicator 252 to provide an indication of the aspirated blood flow rate.
- the control valve can be positioned in a flow path extending from a lumen of the catheter 202 to the side port 266 , and the control valve can regulate the aspirated blood flow rate through the flow path.
- the control interface 240 can be a slider button that is movable along a track 241 , and the control valve can have an opening that is resized as the slider 240 is moved along the track 241 , thereby regulating the aspirated blood flow rate.
- the slider 240 can be spring loaded so that it returns to a default position when not being manipulated. Alternatively, the slider 340 can maintain a position to which it was recently moved when not being manipulated.
- FIG. 3 is an illustration of an example system 300 including an aspiration control device 320 integrated with a hemostasis valve 360 .
- the integrated aspiration control device 320 and hemostasis valve 360 can be integrated into a common housing.
- the integrated apparatus can have an entrance 362 sized to receive and hemostatically seal a catheter 302 , an exit 364 sized to allow passage of an inner elongated member 308 and hemostatically seal the inner elongated member 308 , a side port 366 designed to connect with a vacuum system, an aspiration control valve in communication with the side port 366 , and a control interface 340 for manipulating the control valve to regulate aspirated blood flow.
- the control valve can be positioned in a flow path extending from a lumen of the catheter 302 to the side port 366 , and the control valve can regulate an aspirated blood flow rate through the flow path.
- the control interface 340 can be a push button that is movable from a fully extended state to a fully compressed state.
- the push button 340 can be held at an intermediate state between the fully extended state to the fully compressed state.
- the control valve can have an opening that is sized depending on the state of the push button, and the flow rate through the flow path can be regulated based on the size of the opening.
- the control valve can be normally open, meaning the opening of the control valve is at a maximum size to allow a maximum flow rate when the push button 340 is fully extended, and the opening of the control valve shrinks to restrict blood flow as the push button 340 is compressed.
- the control valve can be normally closed, meaning the opening of the control valve is at a minimum size to allow a minimum flow rate when the push button 340 is fully extended, and the opening of the control valve extends to allow more blood flow as the push button 340 is compressed.
- FIG. 4 is an illustration of an example system 400 including an aspiration control device 420 connected to regulate aspiration at two hemostasis valves 460 , 480 .
- the system 400 can provide suction simultaneously to two catheters 402 , 404 from a single vacuum source 414 , and the aspiration control device 420 can simultaneously regulate flow rates through both catheters 402 , 404 .
- the system 400 can include a first hemostasis valve 460 that is integrated with the aspiration control device 420 .
- the integrated aspiration control device 420 and hemostasis valve 460 can be integrated into a common housing.
- the integrated apparatus can have an entrance 462 sized to receive and hemostatically seal a Guide Catheter 402 , an exit 464 sized to allow passage of an Intermediate Catheter 404 and hemostatically seal the Intermediate Catheter 404 , a first side port 466 designed to connect with a vacuum system, a second side port 468 designed to connect to the second hemostasis valve 480 , an aspiration control valve in communication with the first side port 466 and the second side port 468 , a control interface 440 for manipulating the control valve to regulate aspirated blood flow, and a visual indicator 452 to provide an indication of an aspirated blood flow rate through the control valve.
- the system 400 can include a second hemostasis valve 480 having an entrance 482 positioned to receive the Intermediate Catheter 404 and hemostatically seal the Intermediate Catheter 404 , an exit 484 sized to allow passage of an inner elongated member 408 such as a microcatheter and hemostatically seal the inner elongated member 408 , and a side port 486 .
- the side port 486 of the second hemostasis valve 480 can be connected by way of a tube 416 to the second side port 468 of the first hemostasis valve 460 .
- the system 400 can include two flow paths to provide suction to each catheter 402 , 404 simultaneously.
- the two flow paths can converge in the control valve of the aspiration control device 420 and receive vacuum pressure from a syringe 414 or other vacuum source connected at the first side port 466 of the first hemostasis valve 460 .
- a first flow path can extend from a lumen of the Guide Catheter 402 to the first side port 466 of the first hemostasis valve 460 .
- a second flow path can extend from a lumen of the Intermediate Catheter, 404 , through a side port 486 of the second hemostasis valve 480 , through the tube 416 , through the second side port 468 of the first hemostasis valve 460 , through the control valve of the aspiration control device 420 , and to the first side port 466 of the first hemostasis valve 460 . Because the first and second flow paths converge in the control valve, the control valve can regulate a first aspirated blood flow rate through the first flow path and a second aspirated blood flow rate through the second flow path.
- the visual indicator 452 can indicate a flow rate of aspirated blood through the control valve.
- the flow rate through the control valve can be the sum of the first flow rate through the first flow path and the second flow rate through the second flow path.
- the control interface 440 can be a slider button that is movable along a track 441 , and the control valve can have an opening that is resized as the slider 440 is moved along the track 441 , thereby regulating the first and the second aspirated blood flow rates.
- the slider 440 can be spring loaded so that it returns to a default position when not being manipulated. Alternatively, the slider 440 can maintain a position to which it was recently moved when not being manipulated.
- FIG. 5 is an illustration of an example system 500 including an aspiration control device 520 integrated into a wire gripping device 590 .
- the system 500 can include two hemostasis valves 560 , 580 . At least one of the hemostasis valves 560 can be connected to the aspiration control device 520 to receive suction from a vacuum source by way of the aspiration control device.
- the aspiration control device 520 can be positioned so that a physician can simultaneously manipulate the wire gripping device 590 and the control interface 540 of the aspiration control device 520 with one hand while the physician's second hand is be free to perform other tasks, such as stabilize the Guide Catheter 502 .
- the system 500 can include a first hemostasis valve 560 and a second hemostasis valve 580 each having a hemostatically sealable entrance 562 , 582 , a hemostatically sealable exit 564 , 584 , and a side port 566 , 586 .
- the hemostasis valves 560 , 580 can be a traditional type hemostasis valve as is known in the art, or a hemostasis valve incorporating features described herein.
- the first hemostasis valve 560 can receive the Guide Catheter 502 at the entrance 562 , pass the Intermediate Catheter 504 through the exit 564 , and connect to tubing 516 at the side port 566 .
- the second hemostasis valve 580 can receive the microcatheter 504 at the entrance 582 , pass a stentriever 508 or other such shaft, guidewire, or inner elongated member through the exit 584 , and have a side port 586 connectable to a pressure flush system, for example as per standard thrombectomy procedure.
- the integrated wire grip device 590 and aspiration control device 520 can be integrated into a common housing.
- the integrated apparatus can have an entrance 592 for receiving and gripping the inner elongated member 508 , an exit for passing through the inner elongated member 508 , a first side port 596 , a second side port 598 , a control valve, and a control interface 540 for the control valve.
- the system 500 can include a first flow path from the Guide Catheter 502 , through the side port 566 of the first hemostasis valve 560 , through the tubing 516 , through the second port 598 of the integrated pull wire/aspiration control apparatus, through the control valve of the aspiration control device 520 , and to the first port 596 of the integrated pull wire/aspiration control apparatus.
- the aspiration control device 520 can control flow through the first flow path to regulate aspirated blood flow through the Guide Catheter 502 .
- the control interface 540 can be a slider button that is movable along a track 541 , and the control valve can have an opening that is resized as the slider 540 is moved along the track 541 , thereby regulating the aspirated blood flow rate through the Guide Catheter 502 .
- the slider 540 can be spring loaded so that it returns to a default position when not being manipulated. Alternatively, the slider 540 can maintain a position to which it was recently moved when not being manipulated.
- a physician can withdraw the microcatheter 504 and thrombectomy device shaft 508 from the catheter 502 while simultaneously controlling aspiration by manipulating the control interface 540 .
- the system can be configured as follows: the exit 564 of the first hemostasis valve 560 can be at a semi-open position, allowing the microcatheter 504 to slide through the exit 564 while inhibiting air leakage; the microcatheter 504 can be locked in place at the entrance of the second hemostasis valve 580 so that the microcatheter 504 is inhibited from moving in relation to the second hemostasis valve 580 ; the exit 584 of the second hemostasis valve 580 can be locked around the stentriever device shaft 508 so that the shaft 508 is inhibited from moving in relation to the second hemostasis valve 580 and the microcatheter 504 ; and the wire gripping device 590 can be locked to the shaft 508 so that the shaft 508
- the wire gripping device 590 can be moved proximally in relation to the first hemostasis valve 560 , thereby pulling the stentriever shaft 508 , second hemostasis valve 580 , and microcatheter 504 proximally and withdrawing the microcatheter 504 and device 508 from the Guide Catheter 502 .
- the physician can use one hand to stabilize the first hemostasis valve 560 while using the other hand to simultaneously pull the wire gripping device 590 and manipulate the control interface 540 on the wire gripping device 590 .
- FIG. 6A is an illustration of an example system 600 including an aspiration control device 620 with a trigger control interface 640 , integrated into a hemostasis valve 660 .
- FIGS. 6B and 6C are cross-sectional views of the aspiration control device 620 depicted in FIG. 6A with FIG. 6B illustrating the control interface 640 at an initial position and FIG. 6C illustrating the control interface 640 at a retracted position.
- the integrated aspiration control device 620 and hemostasis valve 660 can be integrated into a common housing.
- the integrated apparatus can have an entrance 662 sized to receive and hemostatically seal a catheter 602 , an exit 664 sized to allow passage of an inner elongated member 608 and hemostatically seal the inner elongated member 608 , a side port 666 designed to connect with a vacuum system, an aspiration control valve 622 in communication with the side port 666 , a trigger control interface 640 for manipulating the control valve 622 to regulate aspirated blood flow, a lock actuator 670 positioned at the exit 664 , and a hemostatic indicator 672 for indicating the status of the hemostatic seal at the exit 664 .
- the control valve 622 can be positioned in a flow path extending from a lumen 603 of the Guide Catheter 602 , through a proximal end 663 of the Guide Catheter 602 , to the side port 666 , and the control valve 622 can regulate the aspirated blood flow rate through the flow path.
- the control interface 640 can be a trigger that is movable along a portion 644 of the housing extending toward the side port 666 .
- the portion 644 can define a length of travel of the trigger 640 so that the trigger is in an initial, or fully extended position when it is nearest the side port 666 , and the trigger is in a final, or fully retracted position when it is nearest the body of the hemostasis valve 660 .
- the trigger 640 can be spring loaded to return to the initial position when the trigger 640 is not being manipulated.
- the integrated aspiration control/hemostasis valve apparatus can be gripped with a single hand with a thumb positioned on the body of the apparatus near the exit locking actuator 670 , an index finger positioned on the trigger 640 , and the remaining fingers positioned on the apparatus and Guide Catheter 602 to stabilize the Guide Catheter 602 .
- the trigger can be moved from the initial position to a retracted position by squeezing the index finger toward the thumb.
- the aspiration control device 620 can include a control valve 622 including a compressible tubing 624 having an opening 626 that is movable through a range of dimensions in response to being compressed or released by a compression element 642 in communication with the trigger 640 .
- the aspiration control device 620 can be a normally closed device.
- FIG. 6B illustrates the control interface 640 at an initial position.
- the compression element 642 can extend through an opening 646 in the housing 644 to provide maximum compression to the compressible tubing 624 .
- the compression element 642 can engage an edge of the opening 646 in the housing 644 and bend away from the compressible tubing 624 as indicated by the smaller arrow.
- FIG. 6C illustrates the control interface 640 at a retracted position, the compression element 642 bent to move out of the opening 646 in the housing 644 as a result of the trigger being squeezed away from the side port 666 .
- the opening 626 in the compressible tubing 624 can expand to allow a greater flow rate through the control valve 622 .
- the compression element 642 can be spring loaded or connected to the trigger 640 with a spring force so that when the trigger 640 is released, the compression element 642 moves as a result of the spring force to expand within the opening 646 of the housing portion 644 , thereby moving the trigger 640 toward the initial position (as illustrated in FIG. 6B ) and restricting the opening 626 in the compressible tubing 624 .
- FIG. 7A is an illustration of an example locking actuator 770 and an example hemostatic indicator 772 a that can be positioned at an exit 764 of a hemostasis valve.
- the locking actuator 770 can be tightened by manipulating a rotating thumb wheel or pressing a push button.
- the locking actuator 770 can include a gasket or other seal that can be tightened on a catheter, pull wire, or other elongated member extending through the exit 764 of the hemostasis valve.
- the locking actuator 770 can seal the elongated member against air ingress during aspiration while allowing retraction of the elongated member from the exit 764 .
- the locking actuator 770 can be displaceable to discrete positions or over a continuum of positions.
- the locking actuator 770 can be movable from an open, semi-open, and/or closed state of the seal.
- an inner elongated member passing through the locking actuator 770 can be retracted or moved through a lumen of a catheter engaged at an entrance of a hemostatic valve while the gasket of the locking actuator 770 provides sufficient sealing to prevent air ingress when vacuum is applied to a side port of the hemostasis valve during aspiration.
- Air leakage around an inner elongated member can diminish the effectiveness of aspiration and reduce the available volume in a vacuum syringe; however, a gasket seal that is too tight around the inner elongated member can inhibit the inner elongated member from being easily and/or properly manipulated during a treatment.
- a microcatheter and a stentriever can be retracted to retrieve a clot into a Guide Catheter while the Guide Catheter is under full vacuum without air leakage through the gasket of the locking actuator 770 .
- the locking actuator can be indexed to easily and quickly select the position where it accurately seals against the elongate member to prevent air ingress while still facilitating retraction of the elongate member through the hemostasis valve.
- the locking actuator can be set to prevent air ingress when the elongate member is a microcatheter with an inner diameter of 0.021′′ or 0.017′′.
- the hemostatic indicator can be movable to indicate which position the locking actuator is currently in.
- the indicator 772 a can have colored portions that are coded to represent the status of the seal.
- the indicator 772 a can be colored with three portions, a first portion indicating a fully open seal operation, a second portion indicating the seal is operational to provide an air seal and allow retraction of the elongated member, and a third portion indicating a locked closed operation.
- the indicator 772 a can be visible from one or more windows positioned on a side of the housing of the hemostasis valve, and the indicator can be a band with three regions, each region of a different pattern and/or color so that the region visible through the window is changed as the indicator 772 a is rotated.
- the indicator 772 a can be visible from two windows positioned on opposite sides of the housing of the hemostasis valve, and the indicator 772 a can be a band with six regions with same colored regions positioned opposite each other.
- FIGS. 7B through 7I are illustrations of hemostatic indicators 772 b , 772 c , 772 d , 772 e that can be used in place of hemostatic indicator 772 a with the locking actuator 770 illustrated in FIG. 7A .
- Hemostatic indicators 772 b , 772 c , 772 d in FIGS. 7B through 7I can each have three distinguishably patterned and/or distinguishably colored portions to indicate the fully open, hemostatic retraction, and locked operational modes described in relation to FIG. 7A , and each indicator 772 b , 772 c , 772 d can be a band with six regions with same patterned and/or colored regions positioned opposite each other on the band. As illustrated in FIGS.
- the hemostatic indicator can have a dark colored portion, a striped portion, and a light-colored portion.
- the hemostatic indicator 772 c can have a dark colored portion, a diagonally bisected portion having the dark color on one half of the diagonal and a light color on the other half of the diagonal, and a light-colored portion.
- the hemostatic indicator 772 d can have three solid colored portions, each portion having a different solid color.
- the hemostatic indicator 772 e can have three regions, each region having a distinguishable solid color.
- FIGS. 8A through 8D are illustrations of an example system 800 including an aspiration control device 820 with a trigger control interface 840 , integrated with a hemostasis valve 860 .
- FIGS. 8A and 8B illustrate the aspiration control device in an initial position, where FIG. 8B is a cross-sectional view of components of the aspiration control device 820 .
- FIGS. 8C and 8D illustrate the aspiration control device in a retracted position, where FIG. 8D is a cross-sectional view of components of the aspiration control device 820 .
- the integrated aspiration control device 820 and hemostasis valve 860 can be integrated into a common housing.
- the integrated apparatus can have an entrance 862 sized to receive and hemostatically seal a catheter 802 , an exit 864 sized to allow passage of an inner elongated member 808 and hemostatically seal the inner elongated member 808 , a side port 866 designed to connect with a vacuum system, an aspiration control valve 822 in communication with the side port 866 , a trigger control interface 840 for manipulating the control valve 822 to regulate aspirated blood flow, a lock actuator 870 positioned at the exit 864 and including a hemostatic seal, and a hemostatic indicator 872 for indicating the status of the hemostatic seal at the exit 864 .
- the control valve 822 can be positioned in a flow path extending from a lumen 803 of the Guide Catheter 802 to the side port 866 , and the control valve 822 can regulate the aspirated blood flow rate through the flow path.
- the trigger control interface 840 can extend between a joint 850 positioned near the exit locking actuator 870 to a grooved sleeve 854 positioned around a portion 844 of the housing extending toward the side port 866 .
- the trigger 840 can bend at the joint 850 , and the grooved sleeve 854 can slide along the portion 844 of the housing.
- the housing portion 844 can define a length of travel of the trigger 840 so that the trigger is in an initial, or fully extended position when it is bent toward the side port 866 as illustrated in FIGS. 8A and 8B , and the trigger is in a final, or fully retracted position when it is bent toward the body of the hemostasis valve 860 as illustrated in FIGS. 8C and 8D .
- the trigger 840 can be spring loaded to return to the initial position as illustrated in FIGS. 8A and 8B when the trigger 840 is not being manipulated.
- the integrated aspiration control device/hemostasis valve apparatus can be gripped with a single hand with a thumb positioned on a thumb grip 848 near the exit locking actuator 870 , an index finger positioned on the trigger 840 , and the remaining fingers positioned on the apparatus and Guide Catheter 802 to stabilize the Guide Catheter 802 .
- the trigger 840 can be moved from the initial position to the final position by squeezing the index finger toward the thumb.
- the aspiration control device 820 can include a control valve 822 including a compressible tubing 824 having an opening 826 that is movable through a range of dimensions in response to being compressed or released by a compression element 842 in communication with the trigger 840 .
- the aspiration control device 820 can be a normally closed device.
- the compression element 842 In the initial position as illustrated in FIG. 8B , the compression element 842 can extend through an opening 846 in the housing 844 to provide maximum compression to the compressible tubing 824 .
- a grooved sleeve 854 can move over the housing portion 844 .
- the compression element 842 can move into a groove 855 in the grooved sleeve 854 as illustrated in FIG. 8D .
- the compression element 842 can be spring loaded, or the compression element 842 can slide freely through the opening 846 in the housing 844 , being moved into the groove 855 as a result of elastic recovery expanding the compressible tubing 824 and pressing against the compression element 842 .
- the compression tubing 824 can expand to allow a greater flow rate through the control valve 822 .
- the groove 855 can be angled so that as the grooved sleeve 854 is moved along the portion 844 of the housing, being moved away from the side port 866 , progressing from the initial position as illustrated in FIG. 8B to the retracted position as illustrated in FIG. 8D , the compression element 842 can move progressively further into the grooved sleeve 854 , allowing the opening 826 in the compressible tubing 824 to increase.
- Aspirated blood flow rate can be controlled by the size of the opening 826 in the compressible tubing 824 . Therefore, a blood flow rate can be selected by a user over a continuum of blood flow rates by holding the trigger 840 at a position between the initial position and the fully retracted position.
- the trigger 840 can be spring loaded so that it returns to the initial position when not being manipulated.
- FIGS. 9A through 9C are illustrations of an example system 900 including an aspiration control device 920 with a two-finger grip interface 940 integrated with a hemostasis valve 960 .
- FIGS. 9B and 9C are cross-sectional views of components of the aspiration control device 920 depicted in FIG. 9A , where the aspiration control device 920 is illustrated in an initial position in FIGS. 9A and 9B and the aspiration control device 920 is illustrated in a retracted position in FIG. 9C .
- the aspiration control device 920 and hemostasis valve 960 can be integrated into a common housing.
- the integrated apparatus can have an entrance 962 sized to receive and hemostatically seal a catheter 902 , an exit 964 sized to allow passage of an inner elongated member 908 and hemostatically seal the inner elongated member 908 , a side port 966 designed to connect with a vacuum system, an aspiration control valve 922 in communication with the side port 966 , a two-finger grip interface 940 for manipulating the control valve 922 to regulate aspirated blood flow, a lock actuator 970 positioned at the exit 964 and having a hemostatic seal, and a hemostatic indicator 972 for indicating the status of the hemostatic seal at the exit 964 .
- the control valve 922 can be positioned in a flow path extending from a lumen 903 of the Guide Catheter 902 to the side port 966 , and the control valve 922 can regulate the aspirated blood flow rate through the flow path.
- the control interface 940 can have a grooved sleeve 954 surrounding a portion 944 of the housing of the integrated apparatus near the side port 966 .
- the grooved sleeve 954 can slide along the portion 944 of the housing.
- the housing portion 944 can define a length of travel of the trigger 940 so that the trigger is in an initial, or fully extended position when it is positioned nearest the side port 966 , and the trigger 940 is in a final, or fully retracted position when it is nearest the body of the hemostasis valve 960 .
- the trigger 940 can be spring loaded to return to the initial position when the trigger 940 is not being manipulated.
- the trigger 940 can have two arms extending from either side of the grooved sleeve 954 .
- the integrated aspiration control/hemostasis valve apparatus can be gripped with a single hand with a thumb positioned on a thumb grip 948 near the exit locking actuator 970 , an index finger positioned on one arm of the two-finger trigger 940 , a middle finger positioned on another arm of the two-finger trigger 940 , and the remaining fingers positioned on the apparatus and Guide Catheter 902 to stabilize the Guide Catheter 902 .
- the trigger 940 can be moved from the initial position to the final position by squeezing the index finger and middle finger toward the thumb.
- the aspiration control device 920 can include a control valve 922 including a compressible tubing 924 having an opening 926 that is movable through a range of dimensions in response to being compressed or released by a compression element 942 .
- the compression element 942 can be in communication with the trigger 940 by way of the grooved sleeve 954 .
- the aspiration control device 920 can be a normally closed device. In the initial position as illustrated in FIG. 9B , the compression element 942 can extend through an opening 946 in the housing 944 to provide maximum compression to the compressible tubing 924 . As the trigger 940 is moved from the initial position as indicated by the arrows in FIG.
- the grooved sleeve 954 can move over the portion of the housing 944 and away from the side port 966 . As the grooved sleeve 954 is moved away from the side port 966 , the compression element 942 can move into a groove 955 in the grooved sleeve 954 .
- the compression element 942 can be spring loaded, or the compression element 942 can slide freely through the opening 946 in the housing 944 , being moved into the groove 955 as a result of elastic recovery expanding the compressible tubing 924 and pressing against the compression element 942 .
- the compression tubing 924 can expand to allow a greater flow rate through the control valve 922 .
- the groove 955 can be angled so that as the grooved sleeve 954 is moved along the portion 944 of the housing and away from the side port 966 as indicated by the arrow, the compression element 942 can move progressively further into the grooved sleeve 954 , allowing the opening 926 in the compressible tubing 924 to increase.
- Aspirated blood flow rate can be controlled by the size of the opening 926 in the compressible tubing 924 . Therefore, a blood flow rate can be selected by a user over a continuum of blood flow rates by holding the trigger 940 at a position between the initial position and the fully retracted position.
- the trigger 940 can be spring loaded so that it returns to the initial position when not being manipulated.
- FIGS. 10A through 10C are illustrations of an example system 1000 including an aspiration control device 1020 with a lever interface 1040 integrated into a hemostasis valve 1060 , FIG. 10A illustrating the lever interface 1040 in an initial position, FIG. 10B illustrating the lever interface 1040 in a retracted position, and FIG. 10C illustrating a cut-away view of FIG. 10B .
- the aspiration control device 1020 and hemostasis valve 1060 can be integrated into a common housing.
- the integrated apparatus can have an entrance 1062 sized to receive and hemostatically seal a catheter 1002 , an exit 1064 sized to allow passage of an inner elongated member 1008 and hemostatically seal the inner elongated member 1008 , a side port 1066 designed to connect with a vacuum system, an aspiration control valve 1022 in communication with the side port 1066 , a rotating lever interface 1040 for manipulating the control valve 1022 to regulate aspirated blood flow, a lock actuator 1070 positioned at the exit 1064 and having a hemostatic seal, and a hemostatic indicator 1072 for indicating the status of the hemostatic seal at the exit 1064 .
- the control valve 1022 can include flexible tubing 1024 positioned to extend through a bending joint 1050 in the housing of the integrated apparatus.
- the bending joint 1050 can be positioned between the body of the hemostasis valve 1060 and the side port 1066 .
- the housing can be bent at the joint 1050 causing the flexible tubing 1024 to bend. As the flexible tubing 1024 bends, an opening 1026 in the tubing 1024 can resize.
- the control valve 1022 can be positioned in a flow path extending from a lumen 1003 of the Guide Catheter 1002 to the side port 1066 , and the control valve 1022 can regulate the aspirated blood flow rate through the flow path.
- the lever 1040 portion of the aspiration control device 1020 can be bent at the joint 1050 from an initial, or fully extended position as illustrated in FIG. 10A to a fully retracted position as indicated in FIG. 10B .
- the aspiration control device 1020 can include a spring 1032 positioned to return the lever 1040 to the initial position when the trigger 1040 is not being manipulated.
- the integrated aspiration control device/hemostasis valve apparatus can be gripped with a single hand with a thumb positioned on a thumb grip 1048 near the exit locking actuator 1070 , an index finger positioned on the lever 1040 , and the remaining fingers positioned on the apparatus and Guide Catheter 1002 to stabilize the Guide Catheter 1002 .
- the lever 1040 can be moved from the initial position to the final position by squeezing the index finger toward the thumb.
- the flexible tubing 1024 can have an opening 1026 that is movable through a range of dimensions in response to the flexible tubing 1024 being bent when the lever 1040 is moved.
- the aspiration control device 1020 can be a normally open device. In the initial position, the flexible tubing 1024 can be substantially straight as illustrated in FIG. 10A .
- the opening 1026 can be in its largest dimension, widest opening, when the flexible tubing is 1024 substantially strait and the lever is in the initial position 1040 . Configured thusly, in the initial position, the aspiration control device 1020 can allow maximum blood flow. As the lever 1040 is moved from the initial position in the direction indicated by the arrows in FIG.
- a blood flow rate can be selected by a user over a continuum of blood flow rates by holding the lever 1040 at a position between the initial position and a fully retracted position. As the lever 1040 is released, the lever 1040 can return to the initial position by the spring 1032 .
- FIGS. 11A through 11F are illustrations of example systems 1100 , 1100 a including an aspiration control device 1120 with a thumb trigger 1140 integrated into a hemostasis valve 1160 .
- FIGS. 11A and 11B illustrate a system having a thumb trigger 1140 that slides freely while
- FIGS. 11C through 11F illustrate a system having a thumb trigger 1140 a that can be ratcheted to one or more predetermined position and held in place until the ratchet is released.
- FIGS. 11A, 11C, and 11D illustrate the thumb trigger 1140 , 1140 a of each respective example system 1100 , 1100 a in an initial position, and FIGS.
- FIGS. 11A through 11F each respective integrated aspiration control device 1120 , 1120 a and hemostasis valve 1160 can be integrated into a common housing.
- Each integrated apparatus can have an entrance 1162 sized to receive and hemostatically seal a catheter 1102 , an exit 1164 sized to allow passage of an inner elongated member 1108 and hemostatically seal the inner elongated member 1108 , a side port 1166 designed to connect with a vacuum system, an aspiration control valve 1122 in communication with the side port 1166 , a thumb trigger interface 1140 , 1140 a for manipulating the control valve 1122 to regulate aspirated blood flow, and a lock actuator 1170 positioned at the exit 1164 .
- the example system 1100 illustrated in FIGS. 11A and 11B also includes an aspirated blood flow rate indicator 1152 for indicating blood flow rate through the control valve 1122 and a hemostatic indicator 1172 for indicating the status of the hemostatic seal at the exit 1164
- the example system 1100 a illustrated in FIGS. 11C and 11F includes a ratchet release lever 1143 and a ratchet interface 1153 that can be used to hold the thumb trigger 114 in a retracted position and a second side port 1168 .
- the thumb trigger 1140 can move from an initial position as illustrated in FIG. 11A to a compressed configuration as illustrated in FIG. 11B .
- the thumb trigger 1140 can be spring loaded to return to the initial position when the trigger 1140 is not being manipulated.
- the thumb trigger 1140 a can move from an initial position as illustrated in FIG. 11C to a compressed configuration as illustrated in FIG. 11D .
- the thumb trigger 1140 a can be spring loaded by spring 1132 .
- the thumb trigger 1140 a can be ratcheted so that it holds at a fully or partially retracted position.
- the user can press against the thumb trigger 1140 a to further retract the thumb trigger 1140 a as illustrated by the arrow in FIG. 11D , and the user can return the thumb trigger 1140 a to the initial position by pressing a ratchet release lever 1143 as illustrated by the arrow in FIG. 11C , thereby releasing the ratchet interface 1153 and allowing the spring 1132 to return the thumb trigger 1140 a.
- the integrated aspiration control/hemostasis valve apparatus can be gripped with a single hand with a thumb positioned on the thumb trigger 1140 , 1140 a and the fingers positioned on the housing of the integrated apparatus and the Guide Catheter 1102 to stabilize the apparatus and the Guide Catheter 1102 and provide leverage for compressing the thumb trigger 1140 , 1140 a .
- the index finger can be positioned near the side port 1166 and the pinky finger can be positioned on the Guide Catheter 1102 .
- the thumb trigger 1140 , 1140 a can be moved from the initial position illustrated in FIG. 11A or 11C to the compressed position illustrated in FIG. 11B or 11D by squeezing the thumb toward the fingers as indicated by the arrow in FIG. 11B or 11D .
- the control valve 1122 can be positioned in a flow path extending from a lumen 1103 of the Guide Catheter 1102 to the side port 1166 , and the control valve 1022 can regulate the aspirated blood flow rate through the flow path.
- the control valve 1122 can include compressible tubing 1124 positioned to extend through a portion 1144 of the housing of the apparatus extending between from near the entrance 1162 of the hemostasis valve 160 to near the side port 1166 .
- the portion of the housing 1144 can have an opening 1146 through which a compression element 1142 can pass to compress the compressible tubing 1124 .
- the compression element 1142 can be connected to the thumb trigger 1140 , 1140 a so that when the thumb trigger is compressed, the compression element 1142 moves into the opening 1146 , presses against the compressible tubing 1124 , and compresses the compressible tubing 1124 . As the compressible tubing 1124 is compressed, an opening 1126 in the tubing 1124 can be restricted to reduce blood flow rate through the control valve 1122 . The opening 1126 can be moved through a range of dimensions in response to being compressed or released by the compression element 1142 .
- the aspiration control device 1120 can be a normally open device.
- the compression element 1142 can be positioned outside of the opening 1146 in the housing portion 1144 , and the compressible tubing 1124 can be uncompressed.
- the opening 1126 in the compressible tubing 1124 can have a maximum dimension with a wide opening sized to allow a maximum blood flow rate.
- the compression element 1142 can pass through the opening 1146 in the portion 1144 of the housing holding the compressible tubing 1124 and engage the compressible tubing 1124 .
- the opening 1126 in the compressible tubing 1124 can collapse to restrict blood flow through the control valve 1122 .
- the opening 1126 in the compressible tubing 1124 can expand as a result of elastic recovery within the tubing pressing the tubing open and/or elastic qualities of materials of the compressible tubing 1124 .
- the thumb trigger 1140 and the compression element 1142 can be integrated into a singularly molded component 1156 , and the component 1156 can be attached to the common housing of the integrated aspiration control device and hemostasis valve.
- the compression element 1142 can be fixed in relation to the thumb trigger 1140 , meaning the compression element 1142 is translated through the same distance as the thumb trigger 1140 when a physician engages the thumb trigger 1140 .
- the component 1156 can pass through a second portion 1158 of the housing. The second portion 1158 can be sized to stabilize the component 1156 in relation to the overall apparatus.
- the thumb trigger 1140 a , ratchet release lever 1143 , notches to form part of the ratchet interface 1153 , and the compression element 1142 can be integrated into a singularly molded component 1156 a , and the component 1156 a can be attached to the common housing of the integrated aspiration control device and hemostasis valve. Similar to as in FIGS. 11A and 11B , the compression element 1142 of system 1100 a can be fixed in relation to the thumb trigger 1140 a , meaning the compression element 1142 is translated through the same distance as the thumb trigger 1140 a .
- the component 1156 a can surround a second portion 1158 a of the housing. The second portion 1158 a can be sized to stabilize the component 1156 a in relation to the overall apparatus.
- a user can control the position of the thumb trigger 1140 and thereby the flow rate through the aspiration control device 1120 by squeezing and holding the thumb trigger.
- the user To select a flow rate with the system 1100 illustrated in FIGS. 11A and 11B the user must apply a force to the thumb trigger 1140 a (with the exception of the maximum flow rate when the valve opening 1126 is fully open).
- a user can control the flow rate either by pressing the thumb trigger 1140 a or by pressing the ratchet release lever 1143 .
- the user can release the trigger 1140 a and lever 1143 until the user desires to adjust the flow rate.
- the position of the trigger 1140 a can be maintained by the ratchet interface 1153 and the user need not apply any force to maintain the position of the trigger 1140 a.
- FIG. 12 is an illustration of an example system 1200 including an aspiration control device 1220 with a side grip interface 1240 integrated into a hemostasis valve 1260 .
- the side grip interface 1240 can include a button compressible to vary a flow rate of aspirated blood through the aspiration control device 1220 .
- a catheter 1202 can be received by an entrance 1262 of the hemostasis valve 1260 , and the aspiration control device 1220 can be positioned in a flow path from the catheter 1202 to the side port 1266 of the hemostasis valve 1260 .
- the side port 1266 can be sized to be connected to a vacuum system such as a vacuum pump or syringe.
- the aspiration control device 1220 can have an internal valve having an opening that can be adjusted by pressing the side grip 1240 .
- the aspiration control device 1220 can be positioned so that a physician can adjust the flow rate through the flow path with the side grip 1240 while simultaneously stabilizing the Guide Catheter 1202 and extracting a pull wire or other inner elongated member from an exit 1264 of the hemostasis valve 1260 .
- the side grip 1240 can be compressed as a binary switch that switches between a maximum and a minimum blood flow rate. Alternatively, the side grip 1240 can be clicked through a sequence of flow rates, each click selecting a progressively greater or lesser flow rate ending with a reset click returning the flow rate to a starting flow rate. Alternatively, the side grip 1240 can adjust the flow rate over a continuum of flow rates in response to a force applied to the side grip, where the flow rate can be directly or inversely related to the force. In any of the configurations, the aspiration control device 1220 can be a normally open or normally closed device.
- FIGS. 13A through 13E are illustrations of blood flow indicators that can be used to indicate blood flow through an aspiration control device.
- the blood flow indicators illustrated in FIGS. 13A through 13E can be placed in a flow path that includes a control valve of the aspiration control device.
- Some specific example aspiration control devices 120 , 420 , 1120 disclosed herein include a blood flow indicator 152 , 452 , 1152 (see FIGS. 1, 4, 11A, and 11B ), and these blood flow indicators 152 , 452 , 1152 can be designed as illustrated in FIGS. 13A through 13E or other design having a similar function. It is contemplated that other examples disclosed herein can also include a blood flow indicator such as illustrated in FIGS. 13A through 13E or other design having a similar function.
- FIG. 13A illustrates a pin wheel flow rate indicator that can be positioned within the flow path and housed by transparent materials.
- the pin wheel can be visible through transparent materials along the blood flow path.
- the pin wheel can spin faster as blood flow rate is increased, and the physician can be provided a visual indication of blood flow rate by the spin speed of the pin wheel.
- the blood need not be visible so long as at least a portion of the pin wheel is visible, and the portion moves as a visual indication of blood flow rate.
- FIGS. 13B and 13C illustrate a rotating flanged barrel flow rate indicator that can be positioned within the flow path and housed by transparent materials.
- the tips of flanges of the flow rate indicator can be visible through transparent materials along the blood flow path.
- the barrel can rotate faster as blood flow rate is increased, and a physician can be provided a visual indication of blood flow rate by the speed of the flange tips.
- the blood need not be visible so long as at least a portion of the flow rate indicator is visible that moves as a visual indication of blood flow rate.
- FIGS. 13D and 13E illustrate a rotating striped band having angled blades extending from an interior circumference of the band to a central node.
- the blades can be positioned along the blood flow path, and as blood flows over the angled blades, the indicator can rotate circumferentially with a spin speed that is determined by the blood flow rate.
- the striped perimeter of the band can be visible by the physician, and the spin speed of the band can provide a visual indication of flow rate.
- the band can be made visible by being positioned within a transparent housing or by being positioned to be visible through an opening of a non-transparent housing.
- FIG. 14A is an illustration of an example system 1400 including an aspiration control device 1420 controlled by a push button interface 1440 , the aspiration control device 1420 integrated with a hemostasis valve 1460 in a common housing.
- FIGS. 14B through 14D are illustrations of various aspects and configurations of the aspiration control device 1420 .
- the push button interface 1440 can include a button compressible to vary a flow rate of aspirated blood through the aspiration control device 1420 .
- a catheter 1402 can be received by an entrance 1462 of the hemostasis valve 1460 , and the aspiration control device 1420 can be positioned in a flow path from the catheter 1402 to the side port 1466 of the hemostasis valve 1460 .
- the side port 1466 can be sized to be connected to a vacuum system such as a vacuum pump or syringe.
- the aspiration control device 1420 can have an internal valve that can be adjusted by pressing the side grip 1440 .
- the push button interface 1420 can be positioned so that a physician can adjust the flow rate through the flow path with the push button 1440 while simultaneously stabilizing the Guide Catheter 1402 and extracting a pull wire or other inner elongated member from an exit 1464 of the hemostasis valve 1460 .
- the aspiration control device 1420 can include a compressible tubing 1424 , a housing 1444 , the button 1440 , and springs 1432 .
- the compressible tubing 1424 can act as a valve 1422 with an opening 1426 that can be resized through a continuum of dimensions in response to a force applied to press the button 1440 .
- the housing 1444 can contain the compressible tubing 1424 .
- the button 1440 can be mounted in an opening 1446 of the housing 1444 and be attached to the housing 1444 by one or more springs 1432 .
- the aspiration control device 1420 can be a normally open device, and FIG. 14B can illustrate the aspiration control device 1420 in an initial, open position.
- the compressible tubing 1424 can have an opening 1426 that is open to allow maximum blood flow.
- the button 1440 can be pressed to compress the compressible tubing 1424 .
- the aspiration control device 1420 can include compression elements 1442 positioned to press against the compressible tubing 1424 to resize the opening 1426 when the button 1440 is pressed.
- the springs 1432 can provide a spring force to return the aspiration control device 1420 to the initial position when the button 1440 is not being manipulated.
- the flow rate can be inversely related to the force applied to the button.
- FIG. 14C illustrates a variation on the configuration of the springs 1432 of the aspiration control device 1420 as described in relation to FIG. 14B .
- the aspiration control device can 1420 be a normally closed device.
- the one or more springs 1432 can be positioned to provide a spring force to compress the compressible tubing 1424 when the push button 1440 is not being manipulated.
- a force applied to the button 1440 can move the compression elements 1442 to allow the opening 1426 in the compressible tubing 1424 to expand to increase blood flow rate.
- the flow rate can be directly related to the force applied to the button 1440 .
- FIG. 15 is an illustration of an example system 1500 including an aspiration control device 1520 integrated with a hemostasis valve 1560 .
- the integrated aspiration control device 1520 and hemostasis valve 1560 can be integrated into a common housing.
- the integrated apparatus can have an entrance 1562 sized to receive and hemostatically seal a catheter 1502 , an exit 1564 sized to allow passage of an inner elongated member and hemostatically seal the inner elongated member, a side port 1566 designed to connect with a vacuum system, an aspiration control valve in communication with the side port 1566 , and a switch interface 1540 for manipulating the control valve to regulate aspirated blood flow.
- the control valve can be positioned in a flow path extending from a lumen of the catheter 1502 to the side port 1566 , and the control valve can regulate the aspirated blood flow rate through the flow path.
- the switch interface 1540 can include a lever that is rotatable about a joint 1550 connected to the housing of the apparatus.
- the control valve can have an opening that is resized as the lever of the switch interface 1540 is rotated about the joint 1550 , thereby regulating the aspirated blood flow rate.
- the lever of the switch interface 1540 can be spring loaded so that it returns to a default position when not being manipulated. Alternatively, the switch interface 1540 can maintain a position to which it was recently moved when not being manipulated.
- FIG. 16 is an illustration of an example system 1600 including two aspiration control devices 1620 , 1621 configured to regulate aspiration through two catheters 1602 , 1604 at two hemostasis valves 1660 , 1680 with a single vacuum source.
- the system 1600 can provide suction simultaneously to the two catheters 1602 , 1604 from the single vacuum source.
- Aspiration control devices 1620 , 1621 can provide control so that the simultaneous suction provided to each of the catheters 1602 , 1604 is different from the other.
- the system 1600 can include a first hemostasis valve 1660 having an entrance 1662 sized to receive and hemostatically seal a Guide Catheter 1602 , an exit 1664 size to allow passage of an Intermediate Catheter 1604 and hemostatically seal the Intermediate Catheter 1604 , a first side port 1666 , and a second side port 1668 .
- the system can include a first aspiration control device 1620 positioned to regulate blood flow through a flow path from a lumen of the Guide Catheter 1602 to the first side port 1666 of the first hemostasis valve 1660 .
- the first aspiration control device 1620 can be integrated into a common housing with the first hemostasis valve 1660 .
- the first side port 1666 can be connected to a vacuum source.
- the second side port 1668 can be connected to a tubing 1616 .
- the first hemostasis valve 1660 can include an exit locking actuator 1670 for engaging and sealing the Intermediate Catheter 1604 .
- the system 1600 can include a second hemostasis valve 1680 having an entrance 1682 positioned to receive the Intermediate Catheter 1604 and hemostatically seal the Intermediate Catheter 1604 , an exit 1684 sized to allow passage of an inner elongated member 1608 such as a pull wire or shaft of a thrombectomy device and hemostatically seal the inner elongated member 1608 , and a third side port 1686 .
- the system can include a second aspiration control device 1621 positioned to regulate blood flow through a flow path from a lumen of the Intermediate Catheter 1604 to the third side port 1686 .
- the second aspiration control device 1621 can be a stand-alone component connectable to the third side port 1686 .
- the second aspiration control device 1621 can be integrated with the second hemostasis valve 1680 .
- the third side port 1686 can be sized to be connected to the second aspiration control device 1621 , and the second aspiration control device 1621 can be connected to the tubing 1616 .
- the system 1600 can include two flow paths to provide suction to each catheter 1602 , 1604 simultaneously.
- the two flow paths can converge in the control valve of the first aspiration control device 1620 and receive vacuum pressure from a vacuum source connected at the first side port 1666 of the first hemostasis valve 1660 .
- a first flow path can extend from a lumen of the Guide Catheter 1602 to the first side port 1666 of the first hemostasis valve 1660 .
- a second flow path can extend from a lumen of the Intermediate Catheter 1604 , through the side port 1686 of the second hemostasis valve 1680 (third side port), through a second control valve of the second aspiration control device 1621 , through the tube 1616 , through the second side port 1668 of the first hemostasis valve 1660 , through the control valve of the first aspiration control device 1620 , and to the first side port 1666 of the first hemostasis valve 1660 . Because the first and second flow paths converge in the first control valve of the first aspiration control device 1620 , the control valve can regulate a first aspirated blood flow rate through the first flow path and a second aspirated blood flow rate through the second flow path.
- the second aspiration control device 1621 can be manipulated to reduce the suction in the second flow path compared to the first flow path so that the vacuum pressure applied to each flow path are different.
- This set up can be particularly advantageous in thrombectomy procedures when an Intermediate Catheter 1604 is used in conjunction with a Guide Catheter or sheath 1602 .
- the second hemostasis valve 1660 with aspiration control 1621 can be connected to the Intermediate Catheter 1604 and the extension tubing 1616 can connect the aspiration flow to the first hemostasis valve 1660 connected to the Guide Catheter or sheath 1602 .
- the single vacuum source connected to the aspiration control valve 1666 can facilitate reverse flow through the Guide Catheter 1602 and the Intermediate Catheter 1604 as it is retracted and is particularly valuable to prevent clot embolization as the tip of the Intermediate Catheter 1604 enters the tip of Guide Catheter 1602 .
- the vacuum extension tube 1616 can have a greater length than the Intermediate Catheter and may be coiled or extendable for ease of handling.
- the first hemostasis valve 1660 can be a standard hemostasis valve and need not include additional aspiration control 1620 .
- the first aspiration control device 1620 and the second aspiration device 1621 can be designed according to examples and principles disclosed herein and need not be specifically designed as illustrated in FIG. 16 .
- FIG. 17 is an illustration of an example system 1700 including an aspiration control device 1720 that includes an electrical actuator.
- the aspiration control device 1720 can be integrated into the hemostasis valve 1760 .
- the integrated aspiration control device 1720 and hemostasis valve 1760 can be integrated into a common housing.
- the integrated apparatus can have an entrance 1762 sized to receive and hemostatically seal a catheter 1702 , an exit 1764 sized to allow passage of an inner elongated member 1708 and hemostatically seal the inner elongated member 1708 , a side port 1766 designed to connect with a vacuum system, an aspiration control valve in communication with the side port 1766 , and a control interface 1740 for manipulating the control valve to regulate aspirated blood flow.
- the control valve can be positioned in a flow path extending from a lumen of the catheter 1702 to the side port 1766 , and the control valve can regulate an aspirated blood flow rate through the flow path.
- an external aspiration control device 120 such as illustrated in FIG. 1 could include an electrical interface.
- the control valve can have an opening that is sized depending on an electrically actuated mechanism such as a motor.
- the electrical actuator can be programmed to have a set of flow rates and/or predetermined sequences of valve opening positions that a physician can select via the interface 1740 . When the electrical actuator is activated, the opening of the control valve can be sized based on the selected program.
- the program can include specific waveforms or flow patterns.
- it can be advantageous to pulsatile or vary vacuum rates to increase the likelihood that the catheter can fully aspirate the clot, or if the clot has a high fibrin content and cannot be fully aspirated, the pulsatile vacuum can allow the catheter to obtain an improved grip on the clot. This can be beneficial when the aspiration control valve is used with a Balloon Guide Catheter, Guide Sheath, Intermediate or other catheter used in a thrombectomy procedure.
- the control interface 1740 can include mechanisms for selecting a program for the electrical actuator and activating the electrical actuator to execute the program.
- the interface 1740 include mechanical inputs that can be manipulated by a physician to activate the electrical actuator such a slider, push button, switch, wheel, trigger, grip, lever, rotating valve, handle, and/or other mechanism such as described in relation to mechanically controlled aspiration control valve. Additionally, or alternatively, the interface 1740 can include a touch screen, touch pad, multiple push buttons, textual and/or video display, or other type of electrical device user interface.
- FIGS. 18 through 20 are flow diagrams each including method steps for controlling aspiration during an intravascular treatment.
- FIG. 21 is a flow diagram including method steps for a clot retrieval treatment.
- the method steps can be implemented by any of the example systems, devices, and/or apparatus described herein or by a means that would be known to one of ordinary skill in the art. Method steps from one or more methods 1800 , 1900 , 2000 , 2100 can be combined.
- a hemostasis valve can be provided having a distal port and a side port.
- an aspiration control device having a control valve and a control interface can be provided.
- the aspiration control device can be positioned approximate the side port.
- the hemostasis valve and the control valve can be disposed in a common housing.
- a catheter can be provided.
- the catheter can be positioned in the distal port of the hemostasis valve.
- a vacuum source can be provided.
- the vacuum source can be attached to the side port.
- a flow path can be provided extending from a lumen of the catheter to the side port.
- the control interface can be manipulated to control a flow rate through the flow path.
- the catheter can be stabilized, and the control interface can be manipulated simultaneously with a single hand.
- step 1910 the control valve of the aspiration control device can be positioned in the flow path.
- step 1920 a flexible tubing having an opening can be positioned in the flow path.
- step 1930 a housing having an opening can be provided.
- step 1940 the flexible tubing can be positioned in the housing.
- a compression element in communication with the control interface can be provided.
- step 1960 the compression element can be positioned to engage the flexible tubing.
- step 1970 the compression element can be positioned in the opening in the housing.
- step 1980 the compression element can be moved to resize the opening in the flexible tubing by manipulating the control interface.
- step 2010 the control interface can be moved from an initial position by applying a force to the control interface.
- step 2020 the control interface can be released.
- step 2030 the control interface can be returned to the initial position.
- some or all of the steps can be performed by a physician using example systems 100 , 200 , 300 , 400 , 500 , 600 , 800 , 900 , 1000 , 1100 , 1100 a , 1200 , 1400 , 1500 , 1600 , 1700 illustrated herein, variations thereof, and systems having equivalent functionality together with a Balloon Guide Catheter, microcatheter, and clot retriever device to remove a clot from the Neurovasculature.
- a Balloon Guide Catheter can be positioned within a patient.
- the Balloon Guide Catheter can be positioned through known procedures, for example by first positioning a guide wire within the patient, pushing the Balloon Guide Catheter into the patient over the guide wire and dilator or access catheter as appropriate, and removing the guide wire and Access Catheters.
- the Balloon Guide Catheter can have an inflatable balloon near its distal end that can be inflated during the thrombectomy to inhibit proximal blood flow.
- the Balloon Guide Catheter can have a lumen for receiving one or more catheters and/or other devices as needed.
- the distal end of the Balloon Guide Catheter can be positioned in the Internal Carotid Artery or near the clot on the proximal side of the clot.
- the Balloon Guide Catheter can be attached to the entrance of a hemostasis valve.
- the hemostasis valve can be one of the example hemostasis valves described and illustrated herein, a variation thereof, or a hemostasis valve having equivalent functionality.
- a microcatheter and clot retriever device can be positioned for treatment.
- the microcatheter can be positioned such that a distal portion of the microcatheter passes the clot, a majority of the length of the microcatheter passes through the Balloon Guide Catheter, the microcatheter passes through the entrance of the hemostasis valve, and the proximal end of the microcatheter is positioned in the hemostasis valve. While the microcatheter is being positioned, a valve at the entrance of the hemostasis valve can be fully open.
- the clot retriever device can be introduced through the microcatheter after the microcatheter is positioned across the clot using standard interventional techniques.
- the portion of the clot retriever that is configured to expand within the clot can be positioned in the portion of the microcatheter that is positioned within the clot.
- the valve at the entrance of the hemostasis valve can be locked to the microcatheter while the clot retriever device is fed into the microcatheter.
- the clot retriever can be deployed.
- the microcatheter can be retracted such that the distal end of the microcatheter is on the proximal side of the clot while the clot retriever maintains its position within the clot.
- the clot retriever can be unsheathed, and once unsheathed, can expand within the clot.
- the valve at the entrance of the hemostasis valve can be locked to a mid-position around the microcatheter to minimize blood loss.
- an aspiration control valve at a side port of the hemostasis valve can be closed.
- the aspiration control valve can be integral to the hemostasis valve or can be attached to the side port as described and illustrated in the examples herein, variations thereof, or an aspiration control valve having equivalent functionality.
- a vacuum can be created at the side port.
- the vacuum can be created by attaching a luerloc syringe at the side port and retracting its plunger, by connecting a vacuum pump, or other means.
- the closed aspiration control valve can prevent flow through the side port.
- the aspiration control valve In some procedures it can be advantageous to close the aspiration control valve and create the vacuum as described in steps 2110 and 2112 prior to any of the steps 2102 , 2104 , 2106 , or 2108 , or after step 2108 .
- a physician can choose an order that makes the system easier to handle based on their own preference.
- the aspiration control valve is preferably closed before vacuum is applied at the side port to prevent premature aspiration.
- the aspiration control valve can be opened to a low flow position.
- the aspiration control valve can be opened by manipulating a control interface, actuator, trigger, slider, lever, or other interface as described and illustrated in the examples herein, variations thereof, and aspiration control valves having equivalent functionality.
- a balloon on the Balloon Guide Catheter Prior to the aspiration valve being opened, a balloon on the Balloon Guide Catheter can be inflated to occlude blood flow within the vessel of the patient.
- the Balloon Guide Catheter can be configured to occlude the vessel to provide the reverse blood flow improving the efficacy of the clot retrieval device to dislodge and retrieve the thrombus fully in step 2116 .
- step 2118 after the clot retriever device has been partially retracted (e.g. past the Internal Carotid Artery terminus), the aspiration control device can be manipulated to increase the flow rate to a medium flow rate into the syringe, pump, or other vacuum source.
- step 2021 after the clot retriever device has been further retracted (e.g. as the clot retriever device nears the distal end of the Balloon Guide Catheter), the aspiration control device can be manipulated to allow a high flow rate.
- step 2122 while the aspiration control device is set to allow the highest flow rate, the clot retriever device can be retracted into the Balloon Guide Catheter. In steps 2118 through 2122 , the microcatheter can be retracted together with the clot retriever device.
- the example valve systems described herein can be used to control or modulate the vacuum applied to the catheter via the vacuum pump or syringe.
- the aspiration control valve can be used to give the physician an ergonomic and easy way to control the aspiration flow while maintaining control of the catheter and without leaving the side of the patient to modify the pump settings.
- the invention contemplates many variations and modifications of the systems and devices for aspirating blood flow, including integrating an aspiration control device with another other treatment device, attaching an aspiration control device to another traditional treatment device, utilizing one or more aspiration control devices to control flow rate through one or more flow paths, using various configurations of a control valve, using various configurations of a control interface, utilizing various combinations of components to achieve described functionality, utilizing alternative materials to achieve described functionality, combining components from the various examples, combining components from the various example with known components, etc.
Abstract
Description
- The present invention generally relates to intravascular medical treatments, and more particularly, to regulating aspirated blood flow rate during a thrombectomy procedure.
- During intravascular medical treatments it can be advantageous to slow or reverse blood flow at a treatment site within a patient. During a thrombectomy, for example, a physician can utilize a syringe or a vacuum pump to obtain reverse blood flow to aid in dislodgement and retrieval of a blood clot or thrombus in conjunction with a stentriever or for direct aspiration into an Intermediate or Access Catheter. The syringe or vacuum pump can be connected to the proximal end of the Intermediate or Guide Catheter (e.g. Balloon Guide Catheter) and the vacuum can communicate with the distal tip of the catheter through the lumen of the catheter. The syringe and vacuum pump are typically connected to the side arm of a “Rotating Hemostasis Valve” which is attached to the proximal end of the Intermediate or Guide Catheter. “Rotating” refers to a luer connection which can be screwed onto the proximal end of the catheter and can be free to rotate for ease of attachment, while the hemostasis feature facilitates the introduction of other catheters and accessory devices through the Intermediate or Guide Catheter while minimizing back bleed and blood loss. The hemostasis valve typically contains a gasket which may be fully open for device introduction or tightened to prevent any blood loss. The gasket can also be tightened to grip a guidewire or microcatheter which is positioned inside the Intermediate or Guide Catheter. Known hemostasis valves typically include an entrance passageway for receiving the accessory devices or catheters in a hemostatically sealed condition and a side port which can be used for connecting a saline flush, injections such as contrast media or to which the aspiration syringe or vacuum pump can be attached.
- Known hemostasis values can also include a passageway through which a guidewire, microcatheter, Intermediate Catheter, device shaft, or such elongated member can pass. The passageway can include a gasket for hemostatically sealing the exterior perimeter of the inner elongated member to minimize blood loss and grip the inner elongated member in position where required.
- During a thrombectomy procedure, a syringe or vacuum pump can provide suction through a lumen of an Intermediate or Guide Catheter to produce reverse blood flow at the blood clot. When a vacuum pump is used, it is typically set to maximum and applies full vacuum/aspiration as the clot is being retrieved. Similarly, if a vacuum lock syringe is used, full vacuum is typically applied to give the maximum reverse flow rate for as long as possible until the syringe is full.
- In some procedures, a physician can desire to modify the aspiration rate during the procedure to suit specific aspects of a clinical case. For example, during a thrombectomy, a physician might prefer to aspirate slowly on initial clot dislodgement, then increase suction when the clot is approaching the catheter, and then further increase suction to maximum when pulling the clot into the catheter. Increasing aspiration during clot retrieval can reduce the chance of vessel collapse due to negative pressure in the vasculature, and when performed with a syringe, can more effectively utilize the fixed volume of the syringe compared to a steadily applied vacuum. This technique requires simultaneous manipulation of the syringe or pump, retraction of the thrombectomy device, and stabilization of the catheter, which can be extremely difficult with traditional systems.
- There is therefore a need for improved methods, devices, and systems for controlling aspiration during thrombectomy procedures. Similarly, control of aspiration flow rates is potentially beneficial in other intravascular or medical treatments where an aspiration pump or suction syringe is used.
- It is an object of the present invention to provide systems, devices, and methods to meet the above-stated needs. Generally, it is an object of the present invention to provide an aspiration control device having an aspiration control valve controllable by a switch, button, slider, trigger, grip, lever, rotating wheel, rotating valve, handle or other interface that is conveniently positioned and configured to be manipulated while simultaneously stabilizing a hemostasis valve and catheter in one hand and/or retracting an elongated member with the other hand. The aspiration control device can be integrated into a hemostasis valve, integrated into a wire gripping device, and/or attached to an inlet, outlet, hose, pump, or syringe in series with an aspiration flow path. Systems for aspirating blood flow during an intravascular procedure can include combinations of one or more aspiration control devices, one or more hemostasis valves, one or more wire gripping devices, and/or one or more vacuum sources to provide and/or regulate vacuum to one or more catheters.
- An example system can include a hemostasis valve, a control valve, and a control interface. The hemostasis valve can have an entrance for receiving a catheter. The control valve can be in communication with the hemostasis valve and can have an opening resizable from a first dimension to a second dimension, the first dimension sized to limit flow of aspirated blood from the catheter at a first flow rate, and the second dimension sized to limit flow of aspirated blood from the catheter at a second flow rate. The control interface can be in communication with the control valve, and the control interface can be movable to move the opening of the control valve from the first dimension to the second dimension.
- The hemostasis valve can further include a side port. The control valve can be positioned approximate the side port. The control valve can be positioned to prove a flow path for the flow of aspirated blood, the flow path extending from the catheter, through the control valve, and to the side port. The control valve and the control interface can be integrated with the hemostasis valve in a common housing.
- The control interface can be positioned to allow a user to select one of the first flow rate or the second flow rate with a single hand while stabilizing the catheter with the same hand. The control interface can be a button configured to select at least one of the first flow rate or the second flow rate based at least in part on a force applied to the control interface. The opening of the control valve can be movable through a continuum of dimensions between the first dimension and the second dimension such that flow of aspirated blood is controllable over a continuum of flow rates between the first flow rate and the second flow rate. The control interface can be movable through a continuum of positions to move the opening of the control valve through the continuum of dimensions. The control interface can be spring loaded and can be set in a default open or default closed position or be ratcheted to be set at any interim position between fully open and fully closed.
- The hemostasis valve can further include an exit sized to pass an inner elongated member, a seal disposed near the exit, a locking actuator displaceable to open, semi-open, or close the seal, and a hemostatic indicator movable to provide a visual indication of a position of the locking actuator. The inner elongated member can be disposed within a lumen of the catheter. The locking actuator can be displaceable from a first position, a second position, and a third position, each position corresponding to the open, semi-open, or closed state of the seal respectively. The hemostatic indicator can be movable to indicate which position the locking actuator is currently in. When the locking actuator is in the semi-open position, the inner elongated member can be retracted or moved in the catheter while the seal provides sufficient sealing to prevent air ingress when vacuum is applied to the side port during aspiration. During a thrombectomy procedure the inner elongated member can be a microcatheter and a stentriever can be retracted to retrieve the clot into the catheter when the catheter is under full vacuum without air leakage through the seal of the locking actuator.
- An example apparatus can include a distal port, a proximal port, a first side port, a first flow path, a control valve, and a control interface. The distal port can be sized to receive a catheter. The proximal port can be sized to allow passage of an inner elongated member, the inner elongated member being disposed within a lumen of the catheter. The first flow path can extend from the lumen of the catheter to the first side port. The control valve can be in communication with the lumen of the catheter and the first side port, and the control valve can be movable to control blood flow through the first flow path. The control interface can be in communication with the control valve, and the control interface can be movable between at least two positions, the at least two positions corresponding to at least two flow rates of the blood flow through the first flow path.
- The control interface can have a slide button positioned to allow a user to simultaneously select one of the two or more positions with a single hand while also stabilizing the catheter with the single hand.
- The control interface can have a push button, and the push button can be pushed by a force to move the push button between the two or more positions while simultaneously stabilizing the catheter with the single hand.
- The apparatus can further include a second side port and a second flow path. The second flow path can extend from the second side port to the first side port. The control valve can be in communication with the second side port and the first side port, and the control valve can be movable to control the blood flow through the second flow path.
- An example method for aspirating blood flow can include some or all of the following steps and variations thereof. The steps are recited in no particular order. A hemostasis valve having a distal port and a side port can be provided. An aspiration control device having a control valve and a control interface can be provided. The aspiration control device can be positioned approximate the side port. The hemostasis valve and the aspiration control valve can be disposed in a common housing.
- A flow path from a lumen of a catheter positioned in the distal port to the side port can be provided. The control valve of the aspiration control device can be positioned in the flow path. A flexible tubing having an opening can be positioned in the flow path. A housing having an opening can be provided. The flexible tubing can be positioned in the housing. A compression element in communication with the control interface can be provided. The compression element can be positioned to engage the flexible tubing. The compression element can be positioned in the opening in the housing. The compression element can be moved to resize the opening of the flexible tubing by manipulating the control interface.
- The catheter can be provided, and the catheter can be positioned in the distal port. A vacuum source can be provided. A vacuum can be provided to the flow path with the vacuum source. The control interface can be manipulated to control a flow rate through the flow path. To manipulate the control interface, a force can be applied to the control interface and the control interface can be moved from an initial position by applying the force to the control interface. The catheter can be stabilized with a first hand while simultaneously manipulating the control interface with the single hand. The control interface can be released. The control interface can be returned to the initial position.
- The above and further aspects of this invention are further discussed with reference to the
- following description in conjunction with the accompanying drawings, in which like numerals indicate like structural elements and features in various figures. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating principles of the invention. The figures depict one or more implementations of the inventive devices, by way of example only, not by way of limitation.
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FIG. 1 is an illustration of an aspiration control device connected to a hemostasis valve according to aspects of the present invention; -
FIG. 2 is an illustration of an aspiration control device with a sliding interface integrated into a hemostasis valve according to aspects of the present invention; -
FIG. 3 is an illustration of an aspiration control device with a push button interface integrated into a hemostasis valve according to aspects of the present invention; -
FIG. 4 is an illustration of a system including an aspiration control device connected to regulate aspiration at two hemostasis valves according to aspects of the present invention; -
FIG. 5 is an illustration of a system including an aspiration control device integrated into a wire gripping device according to aspects of the present invention; -
FIG. 6A through 6C are illustrations of an aspiration control device with a trigger, a locking actuator, and a hemostatic indicator integrated into a hemostasis valve according to aspects of the present invention; -
FIG. 7A is an illustration of a locking actuator according to aspects of the present invention; -
FIGS. 7B through 7I are illustrations of hemostatic indicators according to aspects of the present invention; -
FIGS. 8A through 8D are illustrations of an aspiration control device with a trigger finger grip interface integrated into a hemostasis valve according to aspects of the present invention; -
FIGS. 9A through 9C are illustrations of an aspiration control device with a two-finger grip interface integrated into a hemostasis valve according to aspects of the present invention; -
FIGS. 10A through 10C are illustrations of an aspiration control device with a lever interface integrated into a hemostasis valve according to aspects of the present invention; -
FIGS. 11A through 11F are illustrations of two variations of an aspiration control device with a thumb trigger interface integrated into a hemostasis valve according to aspects of the present invention; -
FIG. 12 is an illustration of an aspiration control device with a side grip interface integrated into a hemostasis valve according to aspects of the present invention; -
FIGS. 13A through 13E are illustrations of blood flow indicators for an aspiration control device according to aspects of the present invention; -
FIGS. 14A through 14D are illustrations of an aspiration control device controlled by a push button interface integrated into a hemostasis valve according to aspects of the present invention; -
FIG. 15 is an illustration of an aspiration control device controlled by a switch interface according to aspects of the present invention; -
FIG. 16 is an illustration of a system including two aspiration control devices configured to regulate aspiration at two hemostasis valves with only one vacuum source according to aspects of the present invention; -
FIG. 17 is an illustration of an aspiration control device with an electrical actuation interface; and -
FIGS. 18 through 21 are flow diagrams each including method steps for controlling aspiration during a thrombectomy according to aspects of the present invention. - Examples disclosed herein can generally include an aspiration control apparatus or device used together with a hemostasis valve to allow a physician to more easily vary a flow rate of aspirated blood during an intravascular treatment compared to some traditional systems. The aspiration control device can include a control valve in a flow path of aspirated blood and an interface for moving the control valve to regulate a flow rate through the flow path. Controlling the flow rate at the control valve can control reverse blood flow at a treatment site. For example, a flow rate of a reverse blood flow around a blood clot can be varied during a thrombectomy procedure by manipulating the aspiration control device.
- The aspiration control device can be positioned at various locations and have various configurations of control interfaces to achieve greater ease of use compared to traditional systems. For example, the aspiration control device can be a stand-alone assembly that is connectable to a side port of a hemostasis valve, the aspiration control device and hemostasis valve can be integrated as a single assembly, or the aspiration control device can be integrated with a secondary device such as a wire grip device. The interface for moving the control valve can move between two or more discrete positions or over a continuum of positions. Likewise, the control valve can be movable between two or more discrete positions or over a continuum of positions in response to positioning the interface. The regulated flow rate through the control valve can be adjusted by the movement of the control valve. For example, the interface can include a mechanical interface such as a slider, push button, switch, wheel, trigger, grip, lever, rotating valve, handle, etc., the interface can be positioned to allow the physician to adjust the flow rate while simultaneously stabilizing a Guide Catheter or sheath with only a single hand, leaving the physician's second hand free for other activities such as withdrawing a stentriever and microcatheter. The interface can be designed to function similar to valves already known to physicians, such as a rotating valve, to provide a more intuitive interface. In some examples, the aspiration control device can additionally include an electrical actuator that can be programmed to provide specific waveforms or aspiration flow patterns.
- Some example systems having purely mechanical aspiration control device and some example systems which additionally include an electrical actuator can be used to switch on or off the vacuum to allow the vacuum to build to give sudden and significant pressure changes in the catheter to help get improved engagement and removal of challenging thrombus.
- The control valve can have various orientations to regulate blood flow through the control valve. The control valve can include a section of compressible tubing that can be compressed by manipulating the aspiration control device interface. The valve can be in a normally open, non-compressed state when not being manipulated and can compress to restrict flow as a result of manipulation of the interface, the valve can be in a normally closed, compressed state when not being manipulated and can expand to increase flow as a result of manipulation, or the valve can retain its last state of compression, possibly a partially compressed state, when not manipulated and moved to a different retainable state as a result of manipulation. For example, a spring-loaded control valve can be designed as a normally open or normally closed valve, and a rotating valve can be designed as a state retaining valve.
- The aspiration control device can be designed to be used together with two hemostasis valves, the first hemostasis valve providing a suction path for the Guide Catheter, and the second hemostasis valve providing a suction path for the Intermediate Catheter. The aspiration control device can simultaneously regulate vacuum through the Guide Catheter and the Intermediate Catheter through connections to both the first and second hemostasis valves. An advantage of this configuration is the ability to provide suction at two hemostasis valves with a single vacuum source (e.g. single pump or syringe). A second aspiration control device can be used together with the two hemostasis valves and the first aspiration control device, and the second aspiration control device can be connected to the single vacuum source through the first aspiration control device. Configured thusly, two catheters can simultaneously receive suction from the single vacuum, with differing vacuum pressures.
- Alternatively, or additionally, the aspiration control device can be designed as integrated into a secondary device that can be used in conjunction with a hemostasis valve. For example, the aspiration control device can be integrated into a wire grip device, allowing a physician to use a single hand to control the rate of aspiration while simultaneously retracting a thrombectomy device and/or microcatheter, leaving the physician's second hand free for other activities such as stabilizing a Guide Catheter.
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FIG. 1 is an illustration of anexample system 100 including anaspiration control device 120 and ahemostasis valve 160.FIG. 1 illustrates theaspiration control device 120 as a stand-alone device that is connectable to aside port 166 of thehemostasis valve 160 and connectable totubing 112 of a vacuum system. An advantage of the stand-aloneaspiration control device 120 is that it can be configured to mate with atraditional hemostasis valve 160. Acatheter 102 can be received by anentrance 162 of thehemostasis valve 160, and theaspiration control device 120 can be positioned in a flow path from thecatheter 102, through theside port 166 of thehemostasis valve 160, and out through thetubing 112 to the vacuum system. Theaspiration control device 120 can have an internal valve that can be adjusted by moving a control interface oractuator 140. Theaspiration control device 120 can include aflow rate indicator 152 to provide a visual indicate of a rate of blood flow through theaspiration control device 120. Theaspiration control device 120 can be positioned so that a physician can adjust the flow rate through the flow path with theinterface 140 while simultaneously stabilizing theGuide Catheter 102 and extracting a pull wire, shaft of a thrombectomy device, or other innerelongated member 108 from an exit 164 of thehemostasis valve 160. -
FIG. 2 is an illustration of anexample system 200 including anaspiration control device 220 integrated with ahemostasis valve 260. The integratedaspiration control device 220 andhemostasis valve 260 can be integrated into a common housing. The integrated apparatus can have anentrance 262 with a luer connection to receive and hemostatically seal acatheter 202, anexit 264 sized to allow passage of an innerelongated member 208 and adjustable to hemostatically seal the innerelongated member 208, aside port 266 designed to connect with a vacuum system, acontrol interface 240 for manipulating the control valve to regulate aspirated blood flow, and avisual indicator 252 to provide an indication of the aspirated blood flow rate. The control valve can be positioned in a flow path extending from a lumen of thecatheter 202 to theside port 266, and the control valve can regulate the aspirated blood flow rate through the flow path. Thecontrol interface 240 can be a slider button that is movable along atrack 241, and the control valve can have an opening that is resized as theslider 240 is moved along thetrack 241, thereby regulating the aspirated blood flow rate. Theslider 240 can be spring loaded so that it returns to a default position when not being manipulated. Alternatively, theslider 340 can maintain a position to which it was recently moved when not being manipulated. -
FIG. 3 is an illustration of anexample system 300 including anaspiration control device 320 integrated with ahemostasis valve 360. The integratedaspiration control device 320 andhemostasis valve 360 can be integrated into a common housing. The integrated apparatus can have anentrance 362 sized to receive and hemostatically seal acatheter 302, anexit 364 sized to allow passage of an innerelongated member 308 and hemostatically seal the innerelongated member 308, aside port 366 designed to connect with a vacuum system, an aspiration control valve in communication with theside port 366, and acontrol interface 340 for manipulating the control valve to regulate aspirated blood flow. The control valve can be positioned in a flow path extending from a lumen of thecatheter 302 to theside port 366, and the control valve can regulate an aspirated blood flow rate through the flow path. Thecontrol interface 340 can be a push button that is movable from a fully extended state to a fully compressed state. Thepush button 340 can be held at an intermediate state between the fully extended state to the fully compressed state. The control valve can have an opening that is sized depending on the state of the push button, and the flow rate through the flow path can be regulated based on the size of the opening. The control valve can be normally open, meaning the opening of the control valve is at a maximum size to allow a maximum flow rate when thepush button 340 is fully extended, and the opening of the control valve shrinks to restrict blood flow as thepush button 340 is compressed. Alternatively, the control valve can be normally closed, meaning the opening of the control valve is at a minimum size to allow a minimum flow rate when thepush button 340 is fully extended, and the opening of the control valve extends to allow more blood flow as thepush button 340 is compressed. -
FIG. 4 is an illustration of anexample system 400 including anaspiration control device 420 connected to regulate aspiration at twohemostasis valves system 400 can provide suction simultaneously to twocatheters single vacuum source 414, and theaspiration control device 420 can simultaneously regulate flow rates through bothcatheters - The
system 400 can include afirst hemostasis valve 460 that is integrated with theaspiration control device 420. The integratedaspiration control device 420 andhemostasis valve 460 can be integrated into a common housing. The integrated apparatus can have anentrance 462 sized to receive and hemostatically seal aGuide Catheter 402, anexit 464 sized to allow passage of anIntermediate Catheter 404 and hemostatically seal theIntermediate Catheter 404, afirst side port 466 designed to connect with a vacuum system, asecond side port 468 designed to connect to thesecond hemostasis valve 480, an aspiration control valve in communication with thefirst side port 466 and thesecond side port 468, acontrol interface 440 for manipulating the control valve to regulate aspirated blood flow, and avisual indicator 452 to provide an indication of an aspirated blood flow rate through the control valve. - The
system 400 can include asecond hemostasis valve 480 having anentrance 482 positioned to receive theIntermediate Catheter 404 and hemostatically seal theIntermediate Catheter 404, anexit 484 sized to allow passage of an innerelongated member 408 such as a microcatheter and hemostatically seal the innerelongated member 408, and aside port 486. Theside port 486 of thesecond hemostasis valve 480 can be connected by way of atube 416 to thesecond side port 468 of thefirst hemostasis valve 460. - The
system 400 can include two flow paths to provide suction to eachcatheter aspiration control device 420 and receive vacuum pressure from asyringe 414 or other vacuum source connected at thefirst side port 466 of thefirst hemostasis valve 460. A first flow path can extend from a lumen of theGuide Catheter 402 to thefirst side port 466 of thefirst hemostasis valve 460. A second flow path can extend from a lumen of the Intermediate Catheter, 404, through aside port 486 of thesecond hemostasis valve 480, through thetube 416, through thesecond side port 468 of thefirst hemostasis valve 460, through the control valve of theaspiration control device 420, and to thefirst side port 466 of thefirst hemostasis valve 460. Because the first and second flow paths converge in the control valve, the control valve can regulate a first aspirated blood flow rate through the first flow path and a second aspirated blood flow rate through the second flow path. Thevisual indicator 452 can indicate a flow rate of aspirated blood through the control valve. The flow rate through the control valve can be the sum of the first flow rate through the first flow path and the second flow rate through the second flow path. - The
control interface 440 can be a slider button that is movable along atrack 441, and the control valve can have an opening that is resized as theslider 440 is moved along thetrack 441, thereby regulating the first and the second aspirated blood flow rates. Theslider 440 can be spring loaded so that it returns to a default position when not being manipulated. Alternatively, theslider 440 can maintain a position to which it was recently moved when not being manipulated. -
FIG. 5 is an illustration of anexample system 500 including anaspiration control device 520 integrated into a wiregripping device 590. Thesystem 500 can include twohemostasis valves hemostasis valves 560 can be connected to theaspiration control device 520 to receive suction from a vacuum source by way of the aspiration control device. Theaspiration control device 520 can be positioned so that a physician can simultaneously manipulate the wiregripping device 590 and thecontrol interface 540 of theaspiration control device 520 with one hand while the physician's second hand is be free to perform other tasks, such as stabilize theGuide Catheter 502. - The
system 500 can include afirst hemostasis valve 560 and asecond hemostasis valve 580 each having a hemostaticallysealable entrance sealable exit side port hemostasis valves first hemostasis valve 560 can receive theGuide Catheter 502 at theentrance 562, pass theIntermediate Catheter 504 through theexit 564, and connect totubing 516 at theside port 566. Thesecond hemostasis valve 580 can receive themicrocatheter 504 at theentrance 582, pass astentriever 508 or other such shaft, guidewire, or inner elongated member through theexit 584, and have aside port 586 connectable to a pressure flush system, for example as per standard thrombectomy procedure. - The integrated
wire grip device 590 andaspiration control device 520 can be integrated into a common housing. The integrated apparatus can have anentrance 592 for receiving and gripping the innerelongated member 508, an exit for passing through the innerelongated member 508, afirst side port 596, asecond side port 598, a control valve, and acontrol interface 540 for the control valve. - The
system 500 can include a first flow path from theGuide Catheter 502, through theside port 566 of thefirst hemostasis valve 560, through thetubing 516, through thesecond port 598 of the integrated pull wire/aspiration control apparatus, through the control valve of theaspiration control device 520, and to thefirst port 596 of the integrated pull wire/aspiration control apparatus. Theaspiration control device 520 can control flow through the first flow path to regulate aspirated blood flow through theGuide Catheter 502. - The
control interface 540 can be a slider button that is movable along atrack 541, and the control valve can have an opening that is resized as theslider 540 is moved along thetrack 541, thereby regulating the aspirated blood flow rate through theGuide Catheter 502. Theslider 540 can be spring loaded so that it returns to a default position when not being manipulated. Alternatively, theslider 540 can maintain a position to which it was recently moved when not being manipulated. - In an example implementation of the
system 500 illustrated inFIG. 5 , a physician can withdraw themicrocatheter 504 andthrombectomy device shaft 508 from thecatheter 502 while simultaneously controlling aspiration by manipulating thecontrol interface 540. In the example implementation, the system can be configured as follows: theexit 564 of thefirst hemostasis valve 560 can be at a semi-open position, allowing themicrocatheter 504 to slide through theexit 564 while inhibiting air leakage; themicrocatheter 504 can be locked in place at the entrance of thesecond hemostasis valve 580 so that themicrocatheter 504 is inhibited from moving in relation to thesecond hemostasis valve 580; theexit 584 of thesecond hemostasis valve 580 can be locked around thestentriever device shaft 508 so that theshaft 508 is inhibited from moving in relation to thesecond hemostasis valve 580 and themicrocatheter 504; and the wiregripping device 590 can be locked to theshaft 508 so that theshaft 508 is inhibited from moving in relation to thegripping device 590. Configured thusly, the wiregripping device 590 can be moved proximally in relation to thefirst hemostasis valve 560, thereby pulling thestentriever shaft 508,second hemostasis valve 580, andmicrocatheter 504 proximally and withdrawing themicrocatheter 504 anddevice 508 from theGuide Catheter 502. The physician can use one hand to stabilize thefirst hemostasis valve 560 while using the other hand to simultaneously pull the wiregripping device 590 and manipulate thecontrol interface 540 on the wiregripping device 590. -
FIG. 6A is an illustration of anexample system 600 including anaspiration control device 620 with atrigger control interface 640, integrated into ahemostasis valve 660.FIGS. 6B and 6C are cross-sectional views of theaspiration control device 620 depicted inFIG. 6A withFIG. 6B illustrating thecontrol interface 640 at an initial position andFIG. 6C illustrating thecontrol interface 640 at a retracted position. Referring collectively toFIGS. 6A and 6C , the integratedaspiration control device 620 andhemostasis valve 660 can be integrated into a common housing. The integrated apparatus can have anentrance 662 sized to receive and hemostatically seal acatheter 602, anexit 664 sized to allow passage of an innerelongated member 608 and hemostatically seal the innerelongated member 608, aside port 666 designed to connect with a vacuum system, anaspiration control valve 622 in communication with theside port 666, atrigger control interface 640 for manipulating thecontrol valve 622 to regulate aspirated blood flow, alock actuator 670 positioned at theexit 664, and ahemostatic indicator 672 for indicating the status of the hemostatic seal at theexit 664. - The
control valve 622 can be positioned in a flow path extending from alumen 603 of theGuide Catheter 602, through aproximal end 663 of theGuide Catheter 602, to theside port 666, and thecontrol valve 622 can regulate the aspirated blood flow rate through the flow path. Thecontrol interface 640 can be a trigger that is movable along aportion 644 of the housing extending toward theside port 666. Theportion 644 can define a length of travel of thetrigger 640 so that the trigger is in an initial, or fully extended position when it is nearest theside port 666, and the trigger is in a final, or fully retracted position when it is nearest the body of thehemostasis valve 660. Thetrigger 640 can be spring loaded to return to the initial position when thetrigger 640 is not being manipulated. - The integrated aspiration control/hemostasis valve apparatus can be gripped with a single hand with a thumb positioned on the body of the apparatus near the
exit locking actuator 670, an index finger positioned on thetrigger 640, and the remaining fingers positioned on the apparatus andGuide Catheter 602 to stabilize theGuide Catheter 602. The trigger can be moved from the initial position to a retracted position by squeezing the index finger toward the thumb. - Referring to
FIGS. 6B and 6C , theaspiration control device 620 can include acontrol valve 622 including acompressible tubing 624 having anopening 626 that is movable through a range of dimensions in response to being compressed or released by acompression element 642 in communication with thetrigger 640. Theaspiration control device 620 can be a normally closed device. -
FIG. 6B illustrates thecontrol interface 640 at an initial position. In the initial position, thecompression element 642 can extend through anopening 646 in thehousing 644 to provide maximum compression to thecompressible tubing 624. As thetrigger 640 is moved from the initial position as indicated by the larger arrow, thecompression element 642 can engage an edge of theopening 646 in thehousing 644 and bend away from thecompressible tubing 624 as indicated by the smaller arrow. -
FIG. 6C illustrates thecontrol interface 640 at a retracted position, thecompression element 642 bent to move out of theopening 646 in thehousing 644 as a result of the trigger being squeezed away from theside port 666. As thecompression element 642 bends away from thecompressible tubing 624, theopening 626 in thecompressible tubing 624 can expand to allow a greater flow rate through thecontrol valve 622. - The
compression element 642 can be spring loaded or connected to thetrigger 640 with a spring force so that when thetrigger 640 is released, thecompression element 642 moves as a result of the spring force to expand within theopening 646 of thehousing portion 644, thereby moving thetrigger 640 toward the initial position (as illustrated inFIG. 6B ) and restricting theopening 626 in thecompressible tubing 624. -
FIG. 7A is an illustration of anexample locking actuator 770 and an example hemostatic indicator 772 a that can be positioned at anexit 764 of a hemostasis valve. The lockingactuator 770 can be tightened by manipulating a rotating thumb wheel or pressing a push button. The lockingactuator 770 can include a gasket or other seal that can be tightened on a catheter, pull wire, or other elongated member extending through theexit 764 of the hemostasis valve. The lockingactuator 770 can seal the elongated member against air ingress during aspiration while allowing retraction of the elongated member from theexit 764. - The locking
actuator 770 can be displaceable to discrete positions or over a continuum of positions. The lockingactuator 770 can be movable from an open, semi-open, and/or closed state of the seal. When the lockingactuator 770 is in the semi-open position, an inner elongated member passing through the lockingactuator 770 can be retracted or moved through a lumen of a catheter engaged at an entrance of a hemostatic valve while the gasket of the lockingactuator 770 provides sufficient sealing to prevent air ingress when vacuum is applied to a side port of the hemostasis valve during aspiration. Air leakage around an inner elongated member can diminish the effectiveness of aspiration and reduce the available volume in a vacuum syringe; however, a gasket seal that is too tight around the inner elongated member can inhibit the inner elongated member from being easily and/or properly manipulated during a treatment. In one example application of an example hemostasis valve, during a thrombectomy procedure a microcatheter and a stentriever can be retracted to retrieve a clot into a Guide Catheter while the Guide Catheter is under full vacuum without air leakage through the gasket of the lockingactuator 770. - The locking actuator can be indexed to easily and quickly select the position where it accurately seals against the elongate member to prevent air ingress while still facilitating retraction of the elongate member through the hemostasis valve. In particular, for thrombectomy use the locking actuator can be set to prevent air ingress when the elongate member is a microcatheter with an inner diameter of 0.021″ or 0.017″.
- The hemostatic indicator can be movable to indicate which position the locking actuator is currently in. The indicator 772 a can have colored portions that are coded to represent the status of the seal. The indicator 772 a can be colored with three portions, a first portion indicating a fully open seal operation, a second portion indicating the seal is operational to provide an air seal and allow retraction of the elongated member, and a third portion indicating a locked closed operation. The indicator 772 a can be visible from one or more windows positioned on a side of the housing of the hemostasis valve, and the indicator can be a band with three regions, each region of a different pattern and/or color so that the region visible through the window is changed as the indicator 772 a is rotated. Alternatively, the indicator 772 a can be visible from two windows positioned on opposite sides of the housing of the hemostasis valve, and the indicator 772 a can be a band with six regions with same colored regions positioned opposite each other.
-
FIGS. 7B through 7I are illustrations ofhemostatic indicators actuator 770 illustrated inFIG. 7A .Hemostatic indicators FIGS. 7B through 7I can each have three distinguishably patterned and/or distinguishably colored portions to indicate the fully open, hemostatic retraction, and locked operational modes described in relation toFIG. 7A , and eachindicator FIGS. 7B and 7C, the hemostatic indicator can have a dark colored portion, a striped portion, and a light-colored portion. As illustrated inFIGS. 7D and 7E , thehemostatic indicator 772 c can have a dark colored portion, a diagonally bisected portion having the dark color on one half of the diagonal and a light color on the other half of the diagonal, and a light-colored portion. As illustrated inFIGS. 7F and 7G , thehemostatic indicator 772 d can have three solid colored portions, each portion having a different solid color. As illustrated inFIGS. 7H and 7I , thehemostatic indicator 772 e can have three regions, each region having a distinguishable solid color. -
FIGS. 8A through 8D are illustrations of anexample system 800 including anaspiration control device 820 with atrigger control interface 840, integrated with ahemostasis valve 860.FIGS. 8A and 8B illustrate the aspiration control device in an initial position, whereFIG. 8B is a cross-sectional view of components of theaspiration control device 820.FIGS. 8C and 8D illustrate the aspiration control device in a retracted position, whereFIG. 8D is a cross-sectional view of components of theaspiration control device 820. - Referring collectively to
FIGS. 8A through 8D , the integratedaspiration control device 820 andhemostasis valve 860 can be integrated into a common housing. The integrated apparatus can have anentrance 862 sized to receive and hemostatically seal acatheter 802, anexit 864 sized to allow passage of an innerelongated member 808 and hemostatically seal the innerelongated member 808, aside port 866 designed to connect with a vacuum system, anaspiration control valve 822 in communication with theside port 866, atrigger control interface 840 for manipulating thecontrol valve 822 to regulate aspirated blood flow, alock actuator 870 positioned at theexit 864 and including a hemostatic seal, and ahemostatic indicator 872 for indicating the status of the hemostatic seal at theexit 864. - The
control valve 822 can be positioned in a flow path extending from alumen 803 of theGuide Catheter 802 to theside port 866, and thecontrol valve 822 can regulate the aspirated blood flow rate through the flow path. Thetrigger control interface 840 can extend between a joint 850 positioned near theexit locking actuator 870 to agrooved sleeve 854 positioned around aportion 844 of the housing extending toward theside port 866. Thetrigger 840 can bend at the joint 850, and thegrooved sleeve 854 can slide along theportion 844 of the housing. Thehousing portion 844 can define a length of travel of thetrigger 840 so that the trigger is in an initial, or fully extended position when it is bent toward theside port 866 as illustrated inFIGS. 8A and 8B , and the trigger is in a final, or fully retracted position when it is bent toward the body of thehemostasis valve 860 as illustrated inFIGS. 8C and 8D . Thetrigger 840 can be spring loaded to return to the initial position as illustrated inFIGS. 8A and 8B when thetrigger 840 is not being manipulated. - The integrated aspiration control device/hemostasis valve apparatus can be gripped with a single hand with a thumb positioned on a
thumb grip 848 near theexit locking actuator 870, an index finger positioned on thetrigger 840, and the remaining fingers positioned on the apparatus andGuide Catheter 802 to stabilize theGuide Catheter 802. Thetrigger 840 can be moved from the initial position to the final position by squeezing the index finger toward the thumb. - Referring to
FIGS. 8B and 8D , theaspiration control device 820 can include acontrol valve 822 including acompressible tubing 824 having anopening 826 that is movable through a range of dimensions in response to being compressed or released by acompression element 842 in communication with thetrigger 840. Theaspiration control device 820 can be a normally closed device. In the initial position as illustrated inFIG. 8B , thecompression element 842 can extend through anopening 846 in thehousing 844 to provide maximum compression to thecompressible tubing 824. As thetrigger 840 is moved from the initial position as indicated by the arrow, agrooved sleeve 854 can move over thehousing portion 844. As thegrooved sleeve 854 is moved away from theside port 866, thecompression element 842 can move into agroove 855 in thegrooved sleeve 854 as illustrated inFIG. 8D . Thecompression element 842 can be spring loaded, or thecompression element 842 can slide freely through theopening 846 in thehousing 844, being moved into thegroove 855 as a result of elastic recovery expanding thecompressible tubing 824 and pressing against thecompression element 842. As thecompression element 842 moves into thegroove 855 thecompression tubing 824 can expand to allow a greater flow rate through thecontrol valve 822. - The
groove 855 can be angled so that as thegrooved sleeve 854 is moved along theportion 844 of the housing, being moved away from theside port 866, progressing from the initial position as illustrated inFIG. 8B to the retracted position as illustrated inFIG. 8D , thecompression element 842 can move progressively further into thegrooved sleeve 854, allowing theopening 826 in thecompressible tubing 824 to increase. Aspirated blood flow rate can be controlled by the size of theopening 826 in thecompressible tubing 824. Therefore, a blood flow rate can be selected by a user over a continuum of blood flow rates by holding thetrigger 840 at a position between the initial position and the fully retracted position. Thetrigger 840 can be spring loaded so that it returns to the initial position when not being manipulated. -
FIGS. 9A through 9C are illustrations of anexample system 900 including anaspiration control device 920 with a two-finger grip interface 940 integrated with ahemostasis valve 960.FIGS. 9B and 9C are cross-sectional views of components of theaspiration control device 920 depicted inFIG. 9A , where theaspiration control device 920 is illustrated in an initial position inFIGS. 9A and 9B and theaspiration control device 920 is illustrated in a retracted position inFIG. 9C . - Referring collectively to
FIGS. 9A through 9C , theaspiration control device 920 andhemostasis valve 960 can be integrated into a common housing. The integrated apparatus can have anentrance 962 sized to receive and hemostatically seal acatheter 902, anexit 964 sized to allow passage of an innerelongated member 908 and hemostatically seal the innerelongated member 908, aside port 966 designed to connect with a vacuum system, anaspiration control valve 922 in communication with theside port 966, a two-finger grip interface 940 for manipulating thecontrol valve 922 to regulate aspirated blood flow, alock actuator 970 positioned at theexit 964 and having a hemostatic seal, and ahemostatic indicator 972 for indicating the status of the hemostatic seal at theexit 964. - The
control valve 922 can be positioned in a flow path extending from alumen 903 of theGuide Catheter 902 to theside port 966, and thecontrol valve 922 can regulate the aspirated blood flow rate through the flow path. Thecontrol interface 940 can have a groovedsleeve 954 surrounding aportion 944 of the housing of the integrated apparatus near theside port 966. The -
grooved sleeve 954 can slide along theportion 944 of the housing. Thehousing portion 944 can define a length of travel of thetrigger 940 so that the trigger is in an initial, or fully extended position when it is positioned nearest theside port 966, and thetrigger 940 is in a final, or fully retracted position when it is nearest the body of thehemostasis valve 960. Thetrigger 940 can be spring loaded to return to the initial position when thetrigger 940 is not being manipulated. Thetrigger 940 can have two arms extending from either side of thegrooved sleeve 954. - The integrated aspiration control/hemostasis valve apparatus can be gripped with a single hand with a thumb positioned on a
thumb grip 948 near theexit locking actuator 970, an index finger positioned on one arm of the two-finger trigger 940, a middle finger positioned on another arm of the two-finger trigger 940, and the remaining fingers positioned on the apparatus andGuide Catheter 902 to stabilize theGuide Catheter 902. Thetrigger 940 can be moved from the initial position to the final position by squeezing the index finger and middle finger toward the thumb. - Referring to
FIGS. 9B and 9C , theaspiration control device 920 can include acontrol valve 922 including acompressible tubing 924 having anopening 926 that is movable through a range of dimensions in response to being compressed or released by acompression element 942. Thecompression element 942 can be in communication with thetrigger 940 by way of thegrooved sleeve 954. Theaspiration control device 920 can be a normally closed device. In the initial position as illustrated inFIG. 9B , thecompression element 942 can extend through anopening 946 in thehousing 944 to provide maximum compression to thecompressible tubing 924. As thetrigger 940 is moved from the initial position as indicated by the arrows inFIG. 9C , thegrooved sleeve 954 can move over the portion of thehousing 944 and away from theside port 966. As thegrooved sleeve 954 is moved away from theside port 966, thecompression element 942 can move into agroove 955 in thegrooved sleeve 954. - The
compression element 942 can be spring loaded, or thecompression element 942 can slide freely through theopening 946 in thehousing 944, being moved into thegroove 955 as a result of elastic recovery expanding thecompressible tubing 924 and pressing against thecompression element 942. As thecompression element 942 moves into thegroove 955 thecompression tubing 924 can expand to allow a greater flow rate through thecontrol valve 922. Thegroove 955 can be angled so that as thegrooved sleeve 954 is moved along theportion 944 of the housing and away from theside port 966 as indicated by the arrow, thecompression element 942 can move progressively further into thegrooved sleeve 954, allowing theopening 926 in thecompressible tubing 924 to increase. Aspirated blood flow rate can be controlled by the size of theopening 926 in thecompressible tubing 924. Therefore, a blood flow rate can be selected by a user over a continuum of blood flow rates by holding thetrigger 940 at a position between the initial position and the fully retracted position. Thetrigger 940 can be spring loaded so that it returns to the initial position when not being manipulated. -
FIGS. 10A through 10C are illustrations of anexample system 1000 including anaspiration control device 1020 with alever interface 1040 integrated into ahemostasis valve 1060,FIG. 10A illustrating thelever interface 1040 in an initial position,FIG. 10B illustrating thelever interface 1040 in a retracted position, andFIG. 10C illustrating a cut-away view ofFIG. 10B . Referring collectively toFIGS. 10A through 10C , theaspiration control device 1020 andhemostasis valve 1060 can be integrated into a common housing. The integrated apparatus can have anentrance 1062 sized to receive and hemostatically seal a catheter 1002, anexit 1064 sized to allow passage of an innerelongated member 1008 and hemostatically seal the innerelongated member 1008, aside port 1066 designed to connect with a vacuum system, anaspiration control valve 1022 in communication with theside port 1066, arotating lever interface 1040 for manipulating thecontrol valve 1022 to regulate aspirated blood flow, alock actuator 1070 positioned at theexit 1064 and having a hemostatic seal, and ahemostatic indicator 1072 for indicating the status of the hemostatic seal at theexit 1064. - The
control valve 1022 can includeflexible tubing 1024 positioned to extend through a bending joint 1050 in the housing of the integrated apparatus. The bending joint 1050 can be positioned between the body of thehemostasis valve 1060 and theside port 1066. The housing can be bent at the joint 1050 causing theflexible tubing 1024 to bend. As theflexible tubing 1024 bends, anopening 1026 in thetubing 1024 can resize. - The
control valve 1022 can be positioned in a flow path extending from alumen 1003 of the Guide Catheter 1002 to theside port 1066, and thecontrol valve 1022 can regulate the aspirated blood flow rate through the flow path. Thelever 1040 portion of theaspiration control device 1020 can be bent at the joint 1050 from an initial, or fully extended position as illustrated inFIG. 10A to a fully retracted position as indicated inFIG. 10B . Theaspiration control device 1020 can include aspring 1032 positioned to return thelever 1040 to the initial position when thetrigger 1040 is not being manipulated. - The integrated aspiration control device/hemostasis valve apparatus can be gripped with a single hand with a thumb positioned on a
thumb grip 1048 near theexit locking actuator 1070, an index finger positioned on thelever 1040, and the remaining fingers positioned on the apparatus and Guide Catheter 1002 to stabilize the Guide Catheter 1002. Thelever 1040 can be moved from the initial position to the final position by squeezing the index finger toward the thumb. - Referring to
FIGS. 10A and 10C , theflexible tubing 1024 can have anopening 1026 that is movable through a range of dimensions in response to theflexible tubing 1024 being bent when thelever 1040 is moved. Theaspiration control device 1020 can be a normally open device. In the initial position, theflexible tubing 1024 can be substantially straight as illustrated inFIG. 10A . Theopening 1026 can be in its largest dimension, widest opening, when the flexible tubing is 1024 substantially strait and the lever is in theinitial position 1040. Configured thusly, in the initial position, theaspiration control device 1020 can allow maximum blood flow. As thelever 1040 is moved from the initial position in the direction indicated by the arrows inFIG. 10A , the bending of theflexible tubing 1024 can cause theopening 1026 to contract as illustrated inFIG. 10C , thereby restricting blood flow. Therefore, a blood flow rate can be selected by a user over a continuum of blood flow rates by holding thelever 1040 at a position between the initial position and a fully retracted position. As thelever 1040 is released, thelever 1040 can return to the initial position by thespring 1032. -
FIGS. 11A through 11F are illustrations ofexample systems aspiration control device 1120 with athumb trigger 1140 integrated into ahemostasis valve 1160.FIGS. 11A and 11B illustrate a system having athumb trigger 1140 that slides freely whileFIGS. 11C through 11F illustrate a system having a thumb trigger 1140 a that can be ratcheted to one or more predetermined position and held in place until the ratchet is released.FIGS. 11A, 11C, and 11D illustrate thethumb trigger 1140, 1140 a of eachrespective example system FIGS. 11B, 11E, and 11F illustrate thethumb trigger 1140, 1140 a of eachrespective example system FIG. 11D is a cut-away view illustrating thecompression element 1142 andcontrol valve 1122 positioned as inFIG. 11C .FIG. 11F is a cut-away view illustrating thecompression element 1142 andcontrol valve 1122 positioned as inFIG. 11E . Referring collectively toFIGS. 11A through 11F , each respective integratedaspiration control device 1120, 1120 a andhemostasis valve 1160 can be integrated into a common housing. Each integrated apparatus can have anentrance 1162 sized to receive and hemostatically seal acatheter 1102, anexit 1164 sized to allow passage of an innerelongated member 1108 and hemostatically seal the innerelongated member 1108, aside port 1166 designed to connect with a vacuum system, anaspiration control valve 1122 in communication with theside port 1166, athumb trigger interface 1140, 1140 a for manipulating thecontrol valve 1122 to regulate aspirated blood flow, and alock actuator 1170 positioned at theexit 1164. - In addition to the features common to the
example systems example system 1100 illustrated inFIGS. 11A and 11B also includes an aspirated bloodflow rate indicator 1152 for indicating blood flow rate through thecontrol valve 1122 and ahemostatic indicator 1172 for indicating the status of the hemostatic seal at theexit 1164, and theexample system 1100 a illustrated inFIGS. 11C and 11F includes aratchet release lever 1143 and aratchet interface 1153 that can be used to hold the thumb trigger 114 in a retracted position and a second side port 1168. - Referring to the
example system 1100 illustrated inFIGS. 11A and 11B , thethumb trigger 1140 can move from an initial position as illustrated inFIG. 11A to a compressed configuration as illustrated inFIG. 11B . Thethumb trigger 1140 can be spring loaded to return to the initial position when thetrigger 1140 is not being manipulated. Referring to theexample system 1100 a illustrated inFIGS. 11C and 11D , the thumb trigger 1140 a can move from an initial position as illustrated inFIG. 11C to a compressed configuration as illustrated inFIG. 11D . The thumb trigger 1140 a can be spring loaded byspring 1132. The thumb trigger 1140 a can be ratcheted so that it holds at a fully or partially retracted position. The user can press against the thumb trigger 1140 a to further retract the thumb trigger 1140 a as illustrated by the arrow inFIG. 11D , and the user can return the thumb trigger 1140 a to the initial position by pressing aratchet release lever 1143 as illustrated by the arrow inFIG. 11C , thereby releasing theratchet interface 1153 and allowing thespring 1132 to return the thumb trigger 1140 a. - In either
example system thumb trigger 1140, 1140 a and the fingers positioned on the housing of the integrated apparatus and theGuide Catheter 1102 to stabilize the apparatus and theGuide Catheter 1102 and provide leverage for compressing thethumb trigger 1140, 1140 a. The index finger can be positioned near theside port 1166 and the pinky finger can be positioned on theGuide Catheter 1102. Thethumb trigger 1140, 1140 a can be moved from the initial position illustrated inFIG. 11A or 11C to the compressed position illustrated inFIG. 11B or 11D by squeezing the thumb toward the fingers as indicated by the arrow inFIG. 11B or 11D . - Referring collectively to
FIGS. 11A through 11F , in eithersystem control valve 1122 can be positioned in a flow path extending from alumen 1103 of theGuide Catheter 1102 to theside port 1166, and thecontrol valve 1022 can regulate the aspirated blood flow rate through the flow path. Thecontrol valve 1122 can includecompressible tubing 1124 positioned to extend through aportion 1144 of the housing of the apparatus extending between from near theentrance 1162 of thehemostasis valve 160 to near theside port 1166. The portion of thehousing 1144 can have anopening 1146 through which acompression element 1142 can pass to compress thecompressible tubing 1124. Thecompression element 1142 can be connected to thethumb trigger 1140, 1140 a so that when the thumb trigger is compressed, thecompression element 1142 moves into theopening 1146, presses against thecompressible tubing 1124, and compresses thecompressible tubing 1124. As thecompressible tubing 1124 is compressed, anopening 1126 in thetubing 1124 can be restricted to reduce blood flow rate through thecontrol valve 1122. Theopening 1126 can be moved through a range of dimensions in response to being compressed or released by thecompression element 1142. - Referring collectively to
FIGS. 11A through 11F , in eithersystem aspiration control device 1120 can be a normally open device. In the initial position, thecompression element 1142 can be positioned outside of theopening 1146 in thehousing portion 1144, and thecompressible tubing 1124 can be uncompressed. In the initial position, theopening 1126 in thecompressible tubing 1124 can have a maximum dimension with a wide opening sized to allow a maximum blood flow rate. As thethumb trigger 1140 is moved from the initial position illustrated inFIG. 11A orFIG. 11C in the direction of the arrow as indicated inFIG. 11B or 11D , thecompression element 1142 can pass through theopening 1146 in theportion 1144 of the housing holding thecompressible tubing 1124 and engage thecompressible tubing 1124. As thecompression element 1142 presses against thecompressible tubing 1124, theopening 1126 in thecompressible tubing 1124 can collapse to restrict blood flow through thecontrol valve 1122. As the compression element releases thecompressible tubing 1124, or moves toward the initial position, theopening 1126 in thecompressible tubing 1124 can expand as a result of elastic recovery within the tubing pressing the tubing open and/or elastic qualities of materials of thecompressible tubing 1124. - Referring to the
system 1100 illustrated inFIGS. 11A and 11B , thethumb trigger 1140 and thecompression element 1142 can be integrated into a singularly moldedcomponent 1156, and thecomponent 1156 can be attached to the common housing of the integrated aspiration control device and hemostasis valve. Thecompression element 1142 can be fixed in relation to thethumb trigger 1140, meaning thecompression element 1142 is translated through the same distance as thethumb trigger 1140 when a physician engages thethumb trigger 1140. Thecomponent 1156 can pass through asecond portion 1158 of the housing. Thesecond portion 1158 can be sized to stabilize thecomponent 1156 in relation to the overall apparatus. - Referring to the
system 1100 a illustrated inFIGS. 11C through 11F , the thumb trigger 1140 a,ratchet release lever 1143, notches to form part of theratchet interface 1153, and thecompression element 1142 can be integrated into a singularly moldedcomponent 1156 a, and thecomponent 1156 a can be attached to the common housing of the integrated aspiration control device and hemostasis valve. Similar to as inFIGS. 11A and 11B , thecompression element 1142 ofsystem 1100 a can be fixed in relation to the thumb trigger 1140 a, meaning thecompression element 1142 is translated through the same distance as the thumb trigger 1140 a. Thecomponent 1156 a can surround a second portion 1158 a of the housing. The second portion 1158 a can be sized to stabilize thecomponent 1156 a in relation to the overall apparatus. - Although the
systems system 1100 illustrated inFIGS. 11A and 11B , a user can control the position of thethumb trigger 1140 and thereby the flow rate through theaspiration control device 1120 by squeezing and holding the thumb trigger. To select a flow rate with thesystem 1100 illustrated inFIGS. 11A and 11B the user must apply a force to the thumb trigger 1140 a (with the exception of the maximum flow rate when thevalve opening 1126 is fully open). For thesystem 1100 a illustrated inFIGS. 11C through 11F , a user can control the flow rate either by pressing the thumb trigger 1140 a or by pressing theratchet release lever 1143. Once the user has selected a flow rate with thesystem 1100 a illustrated inFIGS. 11C through 11F the user can release the trigger 1140 a andlever 1143 until the user desires to adjust the flow rate. The position of the trigger 1140 a can be maintained by theratchet interface 1153 and the user need not apply any force to maintain the position of the trigger 1140 a. -
FIG. 12 is an illustration of anexample system 1200 including anaspiration control device 1220 with aside grip interface 1240 integrated into ahemostasis valve 1260. Theside grip interface 1240 can include a button compressible to vary a flow rate of aspirated blood through theaspiration control device 1220. Acatheter 1202 can be received by anentrance 1262 of thehemostasis valve 1260, and theaspiration control device 1220 can be positioned in a flow path from thecatheter 1202 to theside port 1266 of thehemostasis valve 1260. Theside port 1266 can be sized to be connected to a vacuum system such as a vacuum pump or syringe. Theaspiration control device 1220 can have an internal valve having an opening that can be adjusted by pressing theside grip 1240. Theaspiration control device 1220 can be positioned so that a physician can adjust the flow rate through the flow path with theside grip 1240 while simultaneously stabilizing theGuide Catheter 1202 and extracting a pull wire or other inner elongated member from anexit 1264 of thehemostasis valve 1260. - The
side grip 1240 can be compressed as a binary switch that switches between a maximum and a minimum blood flow rate. Alternatively, theside grip 1240 can be clicked through a sequence of flow rates, each click selecting a progressively greater or lesser flow rate ending with a reset click returning the flow rate to a starting flow rate. Alternatively, theside grip 1240 can adjust the flow rate over a continuum of flow rates in response to a force applied to the side grip, where the flow rate can be directly or inversely related to the force. In any of the configurations, theaspiration control device 1220 can be a normally open or normally closed device. -
FIGS. 13A through 13E are illustrations of blood flow indicators that can be used to indicate blood flow through an aspiration control device. The blood flow indicators illustrated inFIGS. 13A through 13E can be placed in a flow path that includes a control valve of the aspiration control device. Some specific exampleaspiration control devices blood flow indicator FIGS. 1, 4, 11A, and 11B ), and theseblood flow indicators FIGS. 13A through 13E or other design having a similar function. It is contemplated that other examples disclosed herein can also include a blood flow indicator such as illustrated inFIGS. 13A through 13E or other design having a similar function. - It is contemplated that visual indication of blood flow can be achieved by providing transparent materials along the blood flow path so that blood in the path can be seen by a physician or user.
FIG. 13A illustrates a pin wheel flow rate indicator that can be positioned within the flow path and housed by transparent materials. In addition to the physician seeing the presence of blood in the flow path, the pin wheel can be visible through transparent materials along the blood flow path. The pin wheel can spin faster as blood flow rate is increased, and the physician can be provided a visual indication of blood flow rate by the spin speed of the pin wheel. Alternatively, the blood need not be visible so long as at least a portion of the pin wheel is visible, and the portion moves as a visual indication of blood flow rate. -
FIGS. 13B and 13C illustrate a rotating flanged barrel flow rate indicator that can be positioned within the flow path and housed by transparent materials. The tips of flanges of the flow rate indicator can be visible through transparent materials along the blood flow path. The barrel can rotate faster as blood flow rate is increased, and a physician can be provided a visual indication of blood flow rate by the speed of the flange tips. Alternatively, the blood need not be visible so long as at least a portion of the flow rate indicator is visible that moves as a visual indication of blood flow rate. -
FIGS. 13D and 13E illustrate a rotating striped band having angled blades extending from an interior circumference of the band to a central node. The blades can be positioned along the blood flow path, and as blood flows over the angled blades, the indicator can rotate circumferentially with a spin speed that is determined by the blood flow rate. The striped perimeter of the band can be visible by the physician, and the spin speed of the band can provide a visual indication of flow rate. The band can be made visible by being positioned within a transparent housing or by being positioned to be visible through an opening of a non-transparent housing. -
FIG. 14A is an illustration of anexample system 1400 including anaspiration control device 1420 controlled by apush button interface 1440, theaspiration control device 1420 integrated with ahemostasis valve 1460 in a common housing.FIGS. 14B through 14D are illustrations of various aspects and configurations of theaspiration control device 1420. - The
push button interface 1440 can include a button compressible to vary a flow rate of aspirated blood through theaspiration control device 1420. Acatheter 1402 can be received by anentrance 1462 of thehemostasis valve 1460, and theaspiration control device 1420 can be positioned in a flow path from thecatheter 1402 to theside port 1466 of thehemostasis valve 1460. Theside port 1466 can be sized to be connected to a vacuum system such as a vacuum pump or syringe. Theaspiration control device 1420 can have an internal valve that can be adjusted by pressing theside grip 1440. Thepush button interface 1420 can be positioned so that a physician can adjust the flow rate through the flow path with thepush button 1440 while simultaneously stabilizing theGuide Catheter 1402 and extracting a pull wire or other inner elongated member from anexit 1464 of thehemostasis valve 1460. - As illustrated in
FIG. 14B , theaspiration control device 1420 can include acompressible tubing 1424, ahousing 1444, thebutton 1440, and springs 1432. Thecompressible tubing 1424 can act as avalve 1422 with anopening 1426 that can be resized through a continuum of dimensions in response to a force applied to press thebutton 1440. Thehousing 1444 can contain thecompressible tubing 1424. Thebutton 1440 can be mounted in anopening 1446 of thehousing 1444 and be attached to thehousing 1444 by one ormore springs 1432. Theaspiration control device 1420 can be a normally open device, andFIG. 14B can illustrate theaspiration control device 1420 in an initial, open position. In the initial position, thecompressible tubing 1424 can have anopening 1426 that is open to allow maximum blood flow. Thebutton 1440 can be pressed to compress thecompressible tubing 1424. Theaspiration control device 1420 can includecompression elements 1442 positioned to press against thecompressible tubing 1424 to resize theopening 1426 when thebutton 1440 is pressed. Thesprings 1432 can provide a spring force to return theaspiration control device 1420 to the initial position when thebutton 1440 is not being manipulated. For the normally open configuration, the flow rate can be inversely related to the force applied to the button. -
FIG. 14C illustrates a variation on the configuration of thesprings 1432 of theaspiration control device 1420 as described in relation toFIG. 14B . - As illustrated in
FIG. 14D , the aspiration control device can 1420 be a normally closed device. The one ormore springs 1432 can be positioned to provide a spring force to compress thecompressible tubing 1424 when thepush button 1440 is not being manipulated. A force applied to thebutton 1440 can move thecompression elements 1442 to allow theopening 1426 in thecompressible tubing 1424 to expand to increase blood flow rate. For the normally closed configuration, the flow rate can be directly related to the force applied to thebutton 1440. -
FIG. 15 is an illustration of anexample system 1500 including anaspiration control device 1520 integrated with ahemostasis valve 1560. The integratedaspiration control device 1520 andhemostasis valve 1560 can be integrated into a common housing. The integrated apparatus can have an entrance 1562 sized to receive and hemostatically seal acatheter 1502, anexit 1564 sized to allow passage of an inner elongated member and hemostatically seal the inner elongated member, aside port 1566 designed to connect with a vacuum system, an aspiration control valve in communication with theside port 1566, and aswitch interface 1540 for manipulating the control valve to regulate aspirated blood flow. The control valve can be positioned in a flow path extending from a lumen of thecatheter 1502 to theside port 1566, and the control valve can regulate the aspirated blood flow rate through the flow path. Theswitch interface 1540 can include a lever that is rotatable about a joint 1550 connected to the housing of the apparatus. The control valve can have an opening that is resized as the lever of theswitch interface 1540 is rotated about the joint 1550, thereby regulating the aspirated blood flow rate. The lever of theswitch interface 1540 can be spring loaded so that it returns to a default position when not being manipulated. Alternatively, theswitch interface 1540 can maintain a position to which it was recently moved when not being manipulated. -
FIG. 16 is an illustration of anexample system 1600 including twoaspiration control devices catheters hemostasis valves 1660, 1680 with a single vacuum source. Thesystem 1600 can provide suction simultaneously to the twocatheters Aspiration control devices catheters - The
system 1600 can include a first hemostasis valve 1660 having anentrance 1662 sized to receive and hemostatically seal aGuide Catheter 1602, anexit 1664 size to allow passage of anIntermediate Catheter 1604 and hemostatically seal theIntermediate Catheter 1604, afirst side port 1666, and asecond side port 1668. The system can include a firstaspiration control device 1620 positioned to regulate blood flow through a flow path from a lumen of theGuide Catheter 1602 to thefirst side port 1666 of the first hemostasis valve 1660. The firstaspiration control device 1620 can be integrated into a common housing with the first hemostasis valve 1660. Thefirst side port 1666 can be connected to a vacuum source. Thesecond side port 1668 can be connected to atubing 1616. The first hemostasis valve 1660 can include anexit locking actuator 1670 for engaging and sealing theIntermediate Catheter 1604. - The
system 1600 can include asecond hemostasis valve 1680 having anentrance 1682 positioned to receive theIntermediate Catheter 1604 and hemostatically seal theIntermediate Catheter 1604, anexit 1684 sized to allow passage of an innerelongated member 1608 such as a pull wire or shaft of a thrombectomy device and hemostatically seal the innerelongated member 1608, and athird side port 1686. The system can include a secondaspiration control device 1621 positioned to regulate blood flow through a flow path from a lumen of theIntermediate Catheter 1604 to thethird side port 1686. The secondaspiration control device 1621 can be a stand-alone component connectable to thethird side port 1686. Alternatively, the secondaspiration control device 1621 can be integrated with thesecond hemostasis valve 1680. Thethird side port 1686 can be sized to be connected to the secondaspiration control device 1621, and the secondaspiration control device 1621 can be connected to thetubing 1616. - The
system 1600 can include two flow paths to provide suction to eachcatheter aspiration control device 1620 and receive vacuum pressure from a vacuum source connected at thefirst side port 1666 of the first hemostasis valve 1660. A first flow path can extend from a lumen of theGuide Catheter 1602 to thefirst side port 1666 of the first hemostasis valve 1660. A second flow path can extend from a lumen of theIntermediate Catheter 1604, through theside port 1686 of the second hemostasis valve 1680 (third side port), through a second control valve of the secondaspiration control device 1621, through thetube 1616, through thesecond side port 1668 of the first hemostasis valve 1660, through the control valve of the firstaspiration control device 1620, and to thefirst side port 1666 of the first hemostasis valve 1660. Because the first and second flow paths converge in the first control valve of the firstaspiration control device 1620, the control valve can regulate a first aspirated blood flow rate through the first flow path and a second aspirated blood flow rate through the second flow path. The secondaspiration control device 1621 can be manipulated to reduce the suction in the second flow path compared to the first flow path so that the vacuum pressure applied to each flow path are different. - This set up can be particularly advantageous in thrombectomy procedures when an
Intermediate Catheter 1604 is used in conjunction with a Guide Catheter orsheath 1602. The second hemostasis valve 1660 withaspiration control 1621 can be connected to theIntermediate Catheter 1604 and theextension tubing 1616 can connect the aspiration flow to the first hemostasis valve 1660 connected to the Guide Catheter orsheath 1602. The single vacuum source connected to theaspiration control valve 1666 can facilitate reverse flow through theGuide Catheter 1602 and theIntermediate Catheter 1604 as it is retracted and is particularly valuable to prevent clot embolization as the tip of theIntermediate Catheter 1604 enters the tip ofGuide Catheter 1602. This can also be highly beneficial if a stentriever is used in conjunction with theIntermediate Catheter 1604 andGuide Catheter 1602 particularly when the stentriever is partially retrieved into theIntermediate Catheter 1604 and the stentriever andIntermediate Catheter 1604 are retrieved as a single unit such as during the EPIC technique. To facilitate this thevacuum extension tube 1616 can have a greater length than the Intermediate Catheter and may be coiled or extendable for ease of handling. In some thrombectomy procedures, the first hemostasis valve 1660 can be a standard hemostasis valve and need not includeadditional aspiration control 1620. - The first
aspiration control device 1620 and thesecond aspiration device 1621 can be designed according to examples and principles disclosed herein and need not be specifically designed as illustrated inFIG. 16 . -
FIG. 17 is an illustration of anexample system 1700 including anaspiration control device 1720 that includes an electrical actuator. As illustrated, theaspiration control device 1720 can be integrated into thehemostasis valve 1760. The integratedaspiration control device 1720 andhemostasis valve 1760 can be integrated into a common housing. The integrated apparatus can have anentrance 1762 sized to receive and hemostatically seal acatheter 1702, anexit 1764 sized to allow passage of an innerelongated member 1708 and hemostatically seal the innerelongated member 1708, aside port 1766 designed to connect with a vacuum system, an aspiration control valve in communication with theside port 1766, and acontrol interface 1740 for manipulating the control valve to regulate aspirated blood flow. The control valve can be positioned in a flow path extending from a lumen of thecatheter 1702 to theside port 1766, and the control valve can regulate an aspirated blood flow rate through the flow path. Although not illustrated, it is contemplated that an externalaspiration control device 120 such as illustrated inFIG. 1 could include an electrical interface. - The control valve can have an opening that is sized depending on an electrically actuated mechanism such as a motor. The electrical actuator can be programmed to have a set of flow rates and/or predetermined sequences of valve opening positions that a physician can select via the
interface 1740. When the electrical actuator is activated, the opening of the control valve can be sized based on the selected program. - In some examples, the program can include specific waveforms or flow patterns. In some applications, it can be advantageous to pulsatile or vary vacuum rates to increase the likelihood that the catheter can fully aspirate the clot, or if the clot has a high fibrin content and cannot be fully aspirated, the pulsatile vacuum can allow the catheter to obtain an improved grip on the clot. This can be beneficial when the aspiration control valve is used with a Balloon Guide Catheter, Guide Sheath, Intermediate or other catheter used in a thrombectomy procedure.
- The
control interface 1740 can include mechanisms for selecting a program for the electrical actuator and activating the electrical actuator to execute the program. Theinterface 1740 include mechanical inputs that can be manipulated by a physician to activate the electrical actuator such a slider, push button, switch, wheel, trigger, grip, lever, rotating valve, handle, and/or other mechanism such as described in relation to mechanically controlled aspiration control valve. Additionally, or alternatively, theinterface 1740 can include a touch screen, touch pad, multiple push buttons, textual and/or video display, or other type of electrical device user interface. -
FIGS. 18 through 20 are flow diagrams each including method steps for controlling aspiration during an intravascular treatment.FIG. 21 is a flow diagram including method steps for a clot retrieval treatment. The method steps can be implemented by any of the example systems, devices, and/or apparatus described herein or by a means that would be known to one of ordinary skill in the art. Method steps from one ormore methods - Referring to a
method 1800 outlined inFIG. 18 , in step 1808 a hemostasis valve can be provided having a distal port and a side port. Instep 1816, an aspiration control device having a control valve and a control interface can be provided. Instep 1824, the aspiration control device can be positioned approximate the side port. Instep 1832, the hemostasis valve and the control valve can be disposed in a common housing. Instep 1840, a catheter can be provided. Instep 1848, the catheter can be positioned in the distal port of the hemostasis valve. Instep 1856, a vacuum source can be provided. Instep 1864, the vacuum source can be attached to the side port. In step 1872, a flow path can be provided extending from a lumen of the catheter to the side port. Instep 1880, the control interface can be manipulated to control a flow rate through the flow path. Instep 1888, the catheter can be stabilized, and the control interface can be manipulated simultaneously with a single hand. - Referring to a
method 1900 outlined inFIG. 19 , instep 1910 the control valve of the aspiration control device can be positioned in the flow path. Instep 1920, a flexible tubing having an opening can be positioned in the flow path. Instep 1930, a housing having an opening can be provided. Instep 1940, the flexible tubing can be positioned in the housing. Instep 1950, a compression element in communication with the control interface can be provided. Instep 1960, the compression element can be positioned to engage the flexible tubing. Instep 1970, the compression element can be positioned in the opening in the housing. Instep 1980, the compression element can be moved to resize the opening in the flexible tubing by manipulating the control interface. - Referring to a
method 2000 outlined inFIG. 20 , instep 2010 the control interface can be moved from an initial position by applying a force to the control interface. In step 2020, the control interface can be released. Instep 2030, the control interface can be returned to the initial position. - Referring to a
method 2100 outlined inFIG. 21 , some or all of the steps can be performed by a physician usingexample systems - In
step 2102, a Balloon Guide Catheter can be positioned within a patient. The Balloon Guide Catheter can be positioned through known procedures, for example by first positioning a guide wire within the patient, pushing the Balloon Guide Catheter into the patient over the guide wire and dilator or access catheter as appropriate, and removing the guide wire and Access Catheters. The Balloon Guide Catheter can have an inflatable balloon near its distal end that can be inflated during the thrombectomy to inhibit proximal blood flow. The Balloon Guide Catheter can have a lumen for receiving one or more catheters and/or other devices as needed. The distal end of the Balloon Guide Catheter can be positioned in the Internal Carotid Artery or near the clot on the proximal side of the clot. - In
step 2104, the Balloon Guide Catheter can be attached to the entrance of a hemostasis valve. The hemostasis valve can be one of the example hemostasis valves described and illustrated herein, a variation thereof, or a hemostasis valve having equivalent functionality. - In
step 2106, a microcatheter and clot retriever device can be positioned for treatment. The microcatheter can be positioned such that a distal portion of the microcatheter passes the clot, a majority of the length of the microcatheter passes through the Balloon Guide Catheter, the microcatheter passes through the entrance of the hemostasis valve, and the proximal end of the microcatheter is positioned in the hemostasis valve. While the microcatheter is being positioned, a valve at the entrance of the hemostasis valve can be fully open. The clot retriever device can be introduced through the microcatheter after the microcatheter is positioned across the clot using standard interventional techniques. The portion of the clot retriever that is configured to expand within the clot can be positioned in the portion of the microcatheter that is positioned within the clot. The valve at the entrance of the hemostasis valve can be locked to the microcatheter while the clot retriever device is fed into the microcatheter. - In step 2108, the clot retriever can be deployed. To deploy the clot retriever, the microcatheter can be retracted such that the distal end of the microcatheter is on the proximal side of the clot while the clot retriever maintains its position within the clot. In this way, the clot retriever can be unsheathed, and once unsheathed, can expand within the clot. While the microcatheter is being retracted, the valve at the entrance of the hemostasis valve can be locked to a mid-position around the microcatheter to minimize blood loss.
- In
step 2110, an aspiration control valve at a side port of the hemostasis valve can be closed. The aspiration control valve can be integral to the hemostasis valve or can be attached to the side port as described and illustrated in the examples herein, variations thereof, or an aspiration control valve having equivalent functionality. - In step 2112, a vacuum can be created at the side port. The vacuum can be created by attaching a luerloc syringe at the side port and retracting its plunger, by connecting a vacuum pump, or other means. The closed aspiration control valve can prevent flow through the side port.
- In some procedures it can be advantageous to close the aspiration control valve and create the vacuum as described in
steps 2110 and 2112 prior to any of thesteps - In
step 2114, the aspiration control valve can be opened to a low flow position. The aspiration control valve can be opened by manipulating a control interface, actuator, trigger, slider, lever, or other interface as described and illustrated in the examples herein, variations thereof, and aspiration control valves having equivalent functionality. Prior to the aspiration valve being opened, a balloon on the Balloon Guide Catheter can be inflated to occlude blood flow within the vessel of the patient. - When the aspiration control valve is open, blood can flow from within the vessel of the patient and into the Balloon Guide Catheter, pulling free thrombus into the catheter. Alternatively, or additionally, the Balloon Guide Catheter can be configured to occlude the vessel to provide the reverse blood flow improving the efficacy of the clot retrieval device to dislodge and retrieve the thrombus fully in
step 2116. - In step 2118, after the clot retriever device has been partially retracted (e.g. past the Internal Carotid Artery terminus), the aspiration control device can be manipulated to increase the flow rate to a medium flow rate into the syringe, pump, or other vacuum source.
- In step 2021, after the clot retriever device has been further retracted (e.g. as the clot retriever device nears the distal end of the Balloon Guide Catheter), the aspiration control device can be manipulated to allow a high flow rate.
- In
step 2122, while the aspiration control device is set to allow the highest flow rate, the clot retriever device can be retracted into the Balloon Guide Catheter. In steps 2118 through 2122, the microcatheter can be retracted together with the clot retriever device. - In procedures where an Intermediate Catheter or Distal Access Catheter is used to aspirate clot without the use of an additional clot retriever device, for example in the A Direct Aspiration First Pass Technique (ADAPT) technique, the example valve systems described herein can be used to control or modulate the vacuum applied to the catheter via the vacuum pump or syringe. The aspiration control valve can be used to give the physician an ergonomic and easy way to control the aspiration flow while maintaining control of the catheter and without leaving the side of the patient to modify the pump settings.
- The descriptions contained herein are examples of embodiments of the invention and are not intended in any way to limit the scope of the invention. As described herein, the invention contemplates many variations and modifications of the systems and devices for aspirating blood flow, including integrating an aspiration control device with another other treatment device, attaching an aspiration control device to another traditional treatment device, utilizing one or more aspiration control devices to control flow rate through one or more flow paths, using various configurations of a control valve, using various configurations of a control interface, utilizing various combinations of components to achieve described functionality, utilizing alternative materials to achieve described functionality, combining components from the various examples, combining components from the various example with known components, etc. The invention contemplates substitutions of component parts illustrated herein with known component parts including known control valves, control interfaces, indicators, etc. These modifications would be apparent to those having ordinary skill in the art to which this invention relates and are intended to be within the scope of the claims which follow.
Claims (20)
Priority Applications (6)
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US16/400,221 US20200345904A1 (en) | 2019-05-01 | 2019-05-01 | Aspiration control valve |
CN202010355931.9A CN111870311A (en) | 2019-05-01 | 2020-04-29 | Suction control valve |
KR1020200051983A KR20200128357A (en) | 2019-05-01 | 2020-04-29 | Aspiration control valve |
JP2020080062A JP2020182844A (en) | 2019-05-01 | 2020-04-30 | Aspiration control valve |
EP20172255.0A EP3733237A1 (en) | 2019-05-01 | 2020-04-30 | Aspiration control valve |
US18/136,138 US20230248894A1 (en) | 2019-05-01 | 2023-04-18 | Aspiration control valve |
Applications Claiming Priority (1)
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US16/400,221 US20200345904A1 (en) | 2019-05-01 | 2019-05-01 | Aspiration control valve |
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US18/136,138 Pending US20230248894A1 (en) | 2019-05-01 | 2023-04-18 | Aspiration control valve |
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EP (1) | EP3733237A1 (en) |
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US11197684B1 (en) | 2021-03-04 | 2021-12-14 | Nventric Corporation | Thrombectomy device and method |
US20220110634A1 (en) * | 2020-10-13 | 2022-04-14 | Asahi Intecc Co., Ltd. | Thrombus Aspiration Systems and Related Methods |
US11490909B2 (en) | 2014-05-19 | 2022-11-08 | Walk Vascular, Llc | Systems and methods for removal of blood and thrombotic material |
US11497521B2 (en) | 2008-10-13 | 2022-11-15 | Walk Vascular, Llc | Assisted aspiration catheter system |
US11510689B2 (en) | 2016-04-06 | 2022-11-29 | Walk Vascular, Llc | Systems and methods for thrombolysis and delivery of an agent |
US20220378450A1 (en) * | 2021-02-15 | 2022-12-01 | Walk Vascular, Llc | Systems and methods for removal of blood and thrombotic material |
WO2023057179A1 (en) * | 2021-10-04 | 2023-04-13 | Koninklijke Philips N.V. | Flow control switch with variable flow rate control and with consistent clog-free inner diameter |
US11653945B2 (en) | 2007-02-05 | 2023-05-23 | Walk Vascular, Llc | Thrombectomy apparatus and method |
US11672561B2 (en) | 2015-09-03 | 2023-06-13 | Walk Vascular, Llc | Systems and methods for manipulating medical devices |
US11679195B2 (en) | 2021-04-27 | 2023-06-20 | Contego Medical, Inc. | Thrombus aspiration system and methods for controlling blood loss |
US11678905B2 (en) | 2018-07-19 | 2023-06-20 | Walk Vascular, Llc | Systems and methods for removal of blood and thrombotic material |
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US11826064B2 (en) | 2018-06-15 | 2023-11-28 | Incuvate, Llc | Systems and methods for aspiration and monitoring |
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JP2022073074A (en) | 2020-10-30 | 2022-05-17 | 株式会社荏原製作所 | Head for holding substrate and substrate processing device |
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Also Published As
Publication number | Publication date |
---|---|
KR20200128357A (en) | 2020-11-12 |
JP2020182844A (en) | 2020-11-12 |
US20230248894A1 (en) | 2023-08-10 |
CN111870311A (en) | 2020-11-03 |
EP3733237A1 (en) | 2020-11-04 |
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