CN219147878U - Ablation catheter and ablation system - Google Patents

Abstract

The utility model provides an ablation catheter and an ablation system, comprising: a catheter, a balloon, and a detection unit; the catheter comprises an outer tube and an inner tube, wherein the inner tube is movably arranged on the outer tube in a penetrating manner along the axial direction of the outer tube and partially penetrates out of the distal end of the outer tube, and the distal end of the outer tube is fixedly connected with the proximal end of the balloon and is connected with the distal end of the inner tube through the balloon; the detection unit comprises a displacement detection unit, wherein the displacement detection unit comprises a variable resistor and a resistance value processing unit; the resistance value of the variable resistor changes along with the movement of the inner tube; the resistance processing unit is used for converting the resistance variation of the variable resistor into the movement amount of the inner tube and feeding back to the equipment end so as to trigger the equipment end to inflate or deflate the balloon. The ablation catheter provided by the utility model is in communication connection with the equipment end for controlling the inflation and deflation of the balloon, and in the process of recovering the balloon to the sheath, the equipment end can automatically start the inflation and deflation function according to the movement amount of the inner tube and/or the state change amount of the balloon through the communication between the ablation catheter and the equipment end.

Description

Ablation catheter and ablation system

Technical Field

The utility model relates to the technical field of medical treatment, in particular to an ablation catheter and an ablation system.

Background

Patients with atrial fibrillation have high risk of cerebral apoplexy, when atrial fibrillation occurs, the atrium beats irregularly and rapidly, the contraction function is lost, blood is easy to stagnate in the atrium to form thrombus, the thrombus falls off, and the arterial system enters the brain, so that cerebral apoplexy occurs. The pulmonary vein is ablated by applying energy through the interventional catheter to isolate the pulmonary vein potential, so that the therapeutic effect can be achieved.

The cryoballoon ablation is based on anatomical consideration, and the balloon is used for freezing by contacting with tissues, so that the method has the characteristics of disposability, continuity and the like. Cryoballoon cryoablation is achieved primarily by the Joule-Thomson effect, the throttle expansion effect. This effect refers to the temperature drop caused by the expansion of the fluid to absorb heat as the high pressure fluid passes through a fine capillary tube to the low pressure region. The cryoablation instrument is the control integration of the whole system and mainly comprises a control panel, a refrigerator storage container, a vacuum system and related pipelines. The refrigerant under high pressure is stored in a steel bottle isolated from the outside at normal temperature, when cryoablation begins, the refrigerant is pressurized, cooled and liquefied through a built-in device of the cryoablation instrument and then reaches the inside of the balloon through a refrigerant conveying pipeline, and the liquefied refrigerant is rapidly vaporized and expanded after being sprayed out through small holes on the surface of the refrigerant conveying pipeline, so that the temperature inside the balloon is rapidly taken away, and the balloon is greatly cooled to generate the cryoablation effect.

In surgery, the balloon is retrieved into the sheath once it is needed to reposition the balloon or to ablate the balloon to the needs of the operator. In order to achieve smooth recovery of the balloon with minimal morphology, the inflation operation is typically repeated and the balloon is deflated after axial elongation. At present, the operation is completed by matching an operator with an assistant, the operator controls a device for axially elongating the balloon in the balloon inflation state, and then the assistant clicks a deflation button on the cryoablation apparatus, so that the operator and the assistant are highly matched, and if the operator is in error in matching, the device can be damaged. Repeating this procedure increases the operation time, and during the operation, the doctor and patient are exposed to the X-ray environment for a longer period of time, which is detrimental to the health of the doctor and patient. If the cryogenic fluid is evacuated from the vacuum source alone without axial elongation, there is a high likelihood that the cryoballoon will not be fully recovered into the sheath, resulting in damage to the balloon or sheath and subsequent injury to the patient.

Disclosure of Invention

The present utility model is directed to an ablation catheter and an ablation system that address one or more of the problems of the prior art.

In view of this, the present utility model provides an ablation catheter comprising: a catheter body, a balloon, and a detection unit;

the catheter body comprises an outer tube and an inner tube, the inner tube is movably arranged on the outer tube in a penetrating manner along the axial direction of the outer tube, part of the inner tube penetrates out of the distal end of the outer tube, and the distal end of the outer tube is fixedly connected with the proximal end of the balloon and is connected with the distal end of the inner tube through the balloon;

the detection unit comprises a displacement detection unit, wherein the displacement detection unit comprises a variable resistor and a resistance value processing unit; the resistance value of the variable resistor changes along with the movement of the inner tube; the resistance processing unit is used for converting the resistance variation of the variable resistor into the movement amount of the inner tube and feeding back to the equipment end so as to trigger the equipment end to inflate or deflate the balloon.

Optionally, in the ablation catheter, the variable resistor includes a resistance wire and a sliding sheet, the resistance wire is kept relatively fixed to the outer tube, and the sliding sheet is disposed on an outer side wall of the inner tube, moves along with movement of the inner tube, and is kept in contact with the resistance wire.

Optionally, in the ablation catheter, the ablation catheter further comprises a handle, the handle is fixed at the proximal end of the outer tube, the inner tube movably penetrates through the handle along the axial direction of the handle, the resistance wire is wound at a fixed position inside the handle, and the sliding sheet is kept in contact with the resistance wire in the handle.

Optionally, in the ablation catheter, the ablation catheter further includes a limiting component, the limiting component includes a first limiting member and a second limiting member, one of the first limiting member and the second limiting member is disposed on an outer side wall of the inner tube, the other is fixed in an inner cavity of the handle, and the first limiting member and the second limiting member are abutted to limit the maximum displacement of the inner tube moving distally.

Optionally, in the ablation catheter, the ablation catheter further comprises a resistance assembly, wherein the resistance assembly comprises an elastic member and a blocking member, one of the elastic member and the blocking member is connected to the outer side wall of the inner tube, the other is fixed to the inner cavity of the handle, and when the inner tube moves proximally until the elastic member and the blocking member are contacted, resistance is generated between the elastic member and the blocking member, so as to be used for representing that the movement of the inner tube proximally reaches an inflation site of the balloon.

Optionally, in the ablation catheter, the elastic member and the blocking member are partially staggered in a radial direction in a free state, and when the inner tube moves to a maximum resistance between the elastic member and the blocking member, the elastic member is deformed to be dislocated with the blocking member so as to release the blocking member from limiting the elastic member.

Optionally, in the ablation catheter, the elastic element includes a spring and a first blocking piece, the first blocking piece is fixed by the spring, the blocking element is a second blocking piece, and the first blocking piece and the second blocking piece are partially staggered in a radial direction in a free state.

The present utility model also provides an ablation system, comprising: a freezing device and an ablation catheter as in any of the preceding claims;

the refrigerating equipment comprises a control unit, wherein the control unit is used for receiving the detection result of the detection unit and controlling the inflation and deflation of the balloon according to the detection result.

Optionally, in the ablation system, the ablation system further includes a display device, the control unit is further configured to be electrically connected to the display device, convert the state variable quantity of the balloon detected by the detection unit into a balloon shape, and the display device displays the balloon shape.

Optionally, in the ablation system, the ablation system further includes a switching device, and the switching device is used for controlling the connection or disconnection between the making unit and the detecting unit.

In summary, the ablation catheter and the ablation system provided by the utility model comprise: a catheter, a balloon, and a detection unit; the catheter comprises an outer tube and an inner tube, wherein the inner tube is movably arranged on the outer tube in a penetrating manner along the axial direction of the outer tube and partially penetrates out of the distal end of the outer tube, and the distal end of the outer tube is fixedly connected with the proximal end of the balloon and is connected with the distal end of the inner tube through the balloon; the detection unit is used for detecting the movement amount of the inner tube and/or the state change amount of the balloon and feeding back the detection result to the equipment end so as to trigger the equipment end to inflate or deflate the balloon. The ablation catheter provided by the embodiment of the utility model is in communication connection with the equipment end for controlling the inflation and deflation of the balloon, and in the process of recovering the balloon to the sheath tube, the equipment end can automatically start the inflation and deflation function according to the movement amount of the inner tube and/or the state change amount of the balloon through the communication between the ablation catheter and the equipment end. Through the design, on one hand, the operation flow can be simplified, the operation can be performed by an operator, and on the other hand, the balloon or the sheath tube can be prevented from being damaged because the balloon cannot be completely recovered to the sheath tube due to the fact that the balloon does not reach the minimum form (is not axially elongated), and the safety of the operation is improved.

Drawings

FIG. 1 is a schematic view of a distal end structure of an ablation catheter according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a proximal end structure of an ablation catheter according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of the connection of various portions of an ablation system in accordance with an embodiment of the present utility model;

FIG. 4 is a logic diagram of an ablation system controlling balloon deflation in accordance with a first embodiment of the present utility model;

FIG. 5 is a logic diagram of an ablation system controlling balloon inflation in accordance with a first embodiment of the utility model;

FIG. 6 is a schematic view of an arrangement of resistance modules in accordance with an embodiment of the present utility model;

FIG. 7 is a schematic view showing the placement of electrodes on a balloon in an embodiment of the present utility model;

FIG. 8 is a logic diagram of an ablation system controlling balloon deflation in accordance with a second embodiment of the present utility model;

FIG. 9 is a logic diagram of an ablation system controlling balloon inflation in accordance with a second embodiment of the utility model;

wherein, each reference sign is explained as follows:

100-an ablation catheter; 200-a freezing device; 300-a display device; 400-switching the integrated device;

1-a catheter body; 2-balloon; 3-soft head; a 4-displacement detection unit; 5-a handle; 6-limiting components; 7-operating control; 8-a resistance assembly;

11-an outer tube; 12-inner tube.

Detailed Description

The utility model will be described in detail with reference to the drawings and the embodiments, in order to make the objects, advantages and features of the utility model more apparent. It should be noted that the drawings are in a very simplified form and are not drawn to scale, merely for convenience and clarity in aiding in the description of embodiments of the utility model. Furthermore, the structures shown in the drawings are often part of actual structures. In particular, the drawings are shown with different emphasis instead being placed upon illustrating the various embodiments. As used in this disclosure, the singular forms "a," "an," and "the" include plural referents, the term "or" is generally used in the sense of comprising "and/or" and the term "plurality" is generally used in the sense of comprising "at least one," and the term "at least two" is generally used in the sense of comprising "two or more," unless otherwise specified or indicated, the terms "first," "second," "third," and the like in the specification are used merely to distinguish between various components, elements, steps, etc., and are not intended to express a logical or sequential relationship between the various components, elements, steps, etc.

The terms "proximal" and "distal" are defined herein with respect to an ablation catheter having one end for intervention into the human body and a manipulation end extending outside the body. The term "proximal" refers to the position of the element closer to the manipulation end of the ablation catheter that extends outside the body, and the term "distal" refers to the position of the element closer to the end of the ablation catheter that is to be inserted into the body and thus farther from the manipulation end of the ablation catheter. Alternatively, in a manual or hand-operated application scenario, the terms "proximal" and "distal" are defined herein with respect to an operator, such as a surgeon or clinician. The term "proximal" refers to a location of an element that is closer to the operator, and the term "distal" refers to a location of an element that is closer to the ablation catheter and thus further from the operator.

[ embodiment one ]

Referring to fig. 3, an embodiment of the present utility model provides an ablation catheter 100, wherein the ablation catheter 100 is communicatively connected to a freezing device 200 when performing ablation on a target tissue using the ablation catheter 100.

Referring to fig. 1, the ablation catheter 100 includes: catheter body 1, balloon 2 and detection unit.

The catheter body 1 comprises an outer tube 11 and an inner tube 12, the inner tube 12 is movably arranged on the outer tube 11 in a penetrating manner along the axial direction of the outer tube 11, and partially penetrates out of the distal end of the outer tube 11, and the distal end of the outer tube 11 is fixedly connected with the proximal end of the balloon 2 and is connected with the distal end of the inner tube 12 through the balloon 2. With this structural design, when the inner tube 12 is moved in the axial direction of the outer tube 11, the distance between the proximal end and the distal end of the balloon 2 can be changed, thereby changing the axial dimension of the balloon 2.

Preferably, a soft head 3 is disposed at the distal end of the inner tube 12, and the distal end of the balloon 2 is fixedly connected with the soft head 3, so as to realize connection between the balloon 2 and the distal end of the inner tube 12. The soft head 3 can avoid the far end of the catheter from damaging human tissues. When the inner tube 12 moves along the axial direction of the outer tube 11, the soft head 3 is driven to move, so that the distance between the proximal end and the distal end of the balloon 2 is also changed.

The detection unit comprises a displacement detection unit, wherein the displacement detection unit comprises a variable resistor and a resistance value processing unit, and the resistance value of the variable resistor changes along with the movement of the inner tube; the resistance value processing unit is used for converting the resistance value variation of the variable resistor into the movement amount of the inner tube and feeding back to an equipment end (the refrigeration equipment 200 shown in fig. 3) to trigger the equipment end to inflate or deflate the balloon 2.

When the ablation catheter provided in this embodiment is actually applied, before entering the human body, the initial state of the ablation catheter is as follows: the distance between the distal end of the inner tube and the distal end of the outer tube is the maximum distance, after entering a human body, the inner tube is pulled to move to the proximal end, the equipment end is triggered to automatically inflate the balloon 2 to implement ablation, and after the ablation is finished, the inner tube is pulled or pushed for multiple times to trigger the equipment end to repeatedly automatically inflate and deflate the balloon 2, so that the recovery of the balloon is completed.

The ablation catheter 100 provided by the embodiment of the utility model is in communication connection with the equipment end for controlling the inflation and deflation of the balloon 2, and in the process of recovering the balloon 2 to the sheath, the equipment end can automatically start the inflation and deflation function according to the movement amount of the inner tube 12 and/or the state change amount of the balloon 2 through the communication between the ablation catheter 100 and the equipment end. Through the design, on one hand, the operation flow can be simplified, the operation of recovering the balloon 2 can be performed by one operator, and on the other hand, the balloon 2 or the sheath can be prevented from being damaged because the balloon 2 cannot be completely recovered to the sheath due to the fact that the balloon 2 does not reach the minimum shape (is not axially elongated), and the safety of the operation is improved.

Embodiments of the present utility model also provide an ablation system comprising a freezing apparatus 200 and the ablation catheter 100 as provided by embodiments of the present utility model. The freezing apparatus 200 includes a control unit (not shown) communicatively connected to the ablation catheter 100, and configured to receive a detection result of the detection unit and control inflation and deflation of the balloon 2 according to the detection result.

In addition to the control unit, the refrigeration unit 200 may also include a vacuum source (e.g., including a fluid output channel, a vacuum pump) and a cold source (e.g., including a fluid input channel, a refrigerant storage tank). The refrigerant storage tank is used for conveying the refrigerant into the balloon 2 through the cold source, and the vacuum pump is used for pumping the refrigerant in the balloon 2 through the vacuum source. The control unit is used for controlling the valve opening of the cold source and the valve opening of the vacuum source respectively so as to complete inflation and deflation of the sacculus 2.

Specifically, the control unit controls inflation and deflation of the balloon 2 according to the detection result, including the steps of:

receiving the detection result from the detection unit in real time, and judging the moving direction of the inner tube 12 according to the detection result;

if the inner tube 12 moves from the proximal end to the distal end and the variation value of the detection result is greater than or equal to a first preset threshold value, controlling to perform the deflation operation on the balloon 2;

if the inner tube 12 moves from the distal end to the proximal end and the variation value of the detection result is greater than or equal to a second preset threshold value, the inflation operation of the balloon 2 is controlled.

The displacement detection unit 4 may be a sliding rheostat, a sliding switch, or the like, and includes a resistance wire and a sliding sheet, where the resistance wire is fixed relative to the outer tube 11, and the sliding sheet is disposed on an outer side wall of the inner tube 12, moves along with the movement of the inner tube 12, and is in contact with the resistance wire.

Preferably, as shown in fig. 2, the ablation catheter 100 further comprises a handle 5, the handle 5 is fixed to the proximal end of the outer tube 11, the inner tube 12 movably passes through the handle 5 along the axial direction of the handle 5, the resistance wire is wound around a fixed position inside the handle 5, and the sliding sheet is kept in contact with the resistance wire in the handle 5. The arrangement of the handle 5 facilitates the arrangement of the variable resistor. The resistance value processing unit may also be disposed in the handle 5, or the resistance value processing unit and the control unit may be integrated in one device.

In addition, preferably, the ablation system further comprises a switching device (not shown) for controlling connection or disconnection between the detection unit and the control unit. The switch device may be provided in the handle 5 or in the refrigerating apparatus 200, and by using the switch device, an operator may select whether to use the automatic air charging/discharging function by himself, thereby improving the operation flexibility.

Fig. 4 is a logic block diagram of the ablation system for controlling balloon deflation in the present embodiment, please refer to fig. 4, wherein the initial resistance value of the variable resistor is R1, when the control inner tube 12 moves distally, the sliding sheet moves on the resistance wire, so that the resistance value of the variable resistor becomes R2, and the electrical signal of the resistance value is transmitted to the resistance value processing unit. The resistance value processing unit calculates the difference between R1 and R2 and converts the difference into a movement amount b. The resistance value processing unit is connected with the equipment end through a circuit, and transmits the movement amount to the refrigeration equipment 200 in the form of a signal. The control unit of the refrigeration equipment 200 can preset a maximum movement amount a, and when the actual movement amount b is smaller than the preset maximum movement amount a, the control unit judges that the balloon 2 is deformed normally and does not trigger a vacuum source; when the actual movement amount b is greater than or equal to the preset maximum movement amount a, the control unit judges that the balloon 2 is abnormally deformed, and sends a control signal to the vacuum source, and the vacuum source vacuumizes according to preset deflation parameters to perform deflation operation on the balloon 2 so as to enable the balloon 2 to be contracted.

Referring to fig. 2 again, preferably, in order to avoid safety problem caused by excessive displacement of the distal movement, a limiting component 6 may be further disposed in the handle 5, and specifically, the limiting component 6 includes a first limiting member and a second limiting member, one of the first limiting member and the second limiting member is disposed on an outer side wall of the inner tube 12, the other is fixed in the inner cavity of the handle 5, and when the first limiting member and the second limiting member abut against each other, the inner tube 12 is limited to further move distally, so that the maximum displacement of the inner tube 12 moving distally is limited. The first limiting member and the second limiting member may be both blocking pieces, but the shapes of the first limiting member and the second limiting member do not constitute a limitation to the present application.

Fig. 5 is a logic diagram of the ablation system for controlling the balloon deflation in the present embodiment, referring to fig. 5, after the balloon 2 is contracted, the inner tube 12 can be controlled to move proximally to the target site and then perform the inflation operation, wherein the displacement of the inner tube 12 to move proximally should not be larger than the displacement of the inner tube 12 to move distally. The inner tube 12 moves proximally, the resistance of the variable resistor becomes R3, and an electrical signal of the resistance is transmitted to the resistance processing unit. The resistance processing unit calculates the difference between R2 and R3 and converts the difference into a movement amount X1 to be transmitted to the equipment end, the control unit of the equipment end compares the received movement amount X1 with a preset movement amount X2, and if X1 is less than X2, the control unit judges that the control unit is in normal movement and does not trigger inflation; if X1 is more than or equal to X2, judging that the air inflation operation is carried out, and the control unit sends a signal to the cold source to carry out the air inflation operation according to preset parameters.

Referring to fig. 6, the ablation catheter 100 further preferably includes a resistance assembly 8, wherein the resistance assembly 8 includes an elastic member and a blocking member, one of the elastic member and the blocking member is connected to the outer sidewall of the inner tube 12, and the other is fixed to the inner cavity of the handle 5, and the elastic member and the blocking member generate resistance when contacting to indicate that the proximal movement of the inner tube 12 will reach the inflation site of the balloon 2. The inflation site is also the target site described above.

Preferably, the elastic member and the blocking member are partially staggered in a radial direction (herein referred to as a radial direction of the handle), and when the inner tube moves to a point where a resistance between the elastic member and the blocking member reaches a maximum, the elastic member is deformed to be dislocated with the blocking member so as to release the blocking member from restraining the elastic member.

The elastic piece comprises a spring and a first baffle, the first baffle is fixed through the spring, the baffle is a second baffle, and the first baffle and the second baffle are partially staggered in the radial direction in a free state. Before reaching the inflation site, the first and second baffles are in contact to generate resistance, and as the inner tube 12 moves further proximally, the resistance slowly increases, but due to the presence of the spring, after reaching the inflation site, the first and second baffles can be displaced axially with little effort, so that the inner tube 12 can move further proximally. The presence of the resistance assembly 8 provides resistance to the operator before the inner tube 12 is moved to the inflation site, thus preventing safety issues from false inflation due to false touches.

In addition, referring to fig. 2 again, optionally, the ablation catheter 100 may further include an operation member 7, where the operation member 7 is connected to the proximal end of the inner tube 12 and is disposed outside the distal end of the handle 5, and the operation member 7 is moved to drive the inner tube 12 to move in the axial direction. The arrangement of the control member 7 increases the convenience of the operator's operation.

[ example two ]

Unlike the first embodiment, in this embodiment, the inflation/deflation function of the refrigeration apparatus 200 is triggered by detecting the state change amount of the balloon 2.

Specifically, in the present embodiment, the detection unit further includes a shape detection unit for detecting a state change amount of the balloon 2, the shape detection unit including an electric field generation unit, a plurality of electrodes 8, and an electric field processing unit. Wherein the electric field generating unit is used for constructing a specific electric field; referring to fig. 7, a plurality of electrodes 8 are disposed in the electric field and on the surface of the balloon 2, for inducing an electric field and transmitting an electric induction signal to the electric field processing unit; the electric field processing unit calculates the state change amount of the balloon 2 according to the change of the electric induction signals of the plurality of electrodes 8 and feeds back the state change amount to the equipment end, namely the control unit in the first embodiment.

A plurality of the electrodes 8 may be provided on the outer surface or the inner surface of the balloon 2. In this embodiment, preferably, the plurality of electrodes 8 are disposed on the outer surface of the balloon 2, and when the plurality of electrodes 8 are disposed on the outer surface of the balloon 2, the positions of the electrodes are further capable of representing the deformation of the balloon 2, so that the accuracy of the state change amount of the balloon 2 calculated according to the electric induction signals of the plurality of electrodes 8 can be improved.

Optionally, the state change amount includes: position change and/or balloon deformation.

Fig. 8 is a logic diagram of the ablation system for controlling balloon deflation in this embodiment, referring to fig. 8, in an inflated state, the initial position of each electrode 8 in the electric field is a first position, and when the inner tube 12 is driven to move distally, the state (shape, diameter, etc.) of the balloon 2 is changed, so that the positions of the electrodes 8 on the surface of the balloon 2 are changed in the electric field, and the changed positions are a second position. Each electrode 8 is connected with the electric field processing unit through a circuit, a position signal is transmitted to the electric field processing unit through the circuit, and the electric field processing unit calculates the position change amount of the electrode 8 in the electric field according to the electric induction signal as a state change amount c, or further calculates the deformation amount of the balloon 2 according to the position change amount of each electrode 8 in the electric field as the state change amount c. The electric field processing unit is also connected with the refrigeration equipment 200 through a circuit, and the state change quantity c is transmitted back to the refrigeration equipment 200 in the form of an electric signal. The control unit in the refrigeration equipment 200 stores a threshold d of a preset state change amount of the balloon 2, and when the state change amount c is smaller than the preset state change amount threshold d, the control unit judges that the balloon 2 is deformed normally and does not trigger a vacuum source; when the state change quantity c is larger than or equal to a preset state change quantity threshold d, the control unit judges that the balloon 2 is abnormally deformed, and sends a control signal to the vacuum source, and the vacuum source vacuumizes according to preset deflation parameters so as to realize deflation operation.

Referring to fig. 3, in the deflated state of the balloon 2, the initial position of each electrode 8 in the electric field is the third position, and when the inner tube 12 is driven to move proximally, the state (shape, diameter, etc.) of the balloon 2 is changed, so that the position of the electrode 8 on the outer surface of the balloon 2 is changed in the electric field, and the changed position is the fourth position. Each electrode 8 is connected with the electric field processing unit through a circuit, a position signal is transmitted to the electric field processing unit through the circuit, and the electric field processing unit calculates the position change amount of the electrode 8 in the electric field according to the electric induction signal as a state change amount-e, or further calculates the deformation amount of the balloon 2 according to the position change amount of the electrode 8 in the electric field as a state change amount-e. The electric field processing unit is also connected with the refrigeration equipment 200 through a circuit, and the state change quantity-e information is transmitted back to the refrigeration equipment 200 in the form of an electric signal. The control unit in the refrigeration equipment 200 stores a threshold value-f of the state change quantity of the balloon 2, and when the state change quantity-e is smaller than a preset state change quantity threshold value-f, the control unit judges that the balloon 2 is deformed normally and does not trigger a vacuum source; when the actual state change quantity-e is larger than or equal to the preset state change quantity threshold value-f, the control unit judges that the balloon 2 is abnormally deformed, and sends a control signal to the vacuum source, and the vacuum source vacuumizes according to preset deflation parameters so as to realize inflation operation.

In particular, as shown in fig. 3, the ablation system provided in this embodiment further includes a display device 300, and the control unit is further configured to be electrically connected to the display device 300, and convert the state variable quantity of the balloon 2 detected by the detection unit into a shape and display the shape on the display device 300 in real time.

To achieve the above functions, the freezing apparatus 200, the ablation catheter 100, and the display device 300 may be integrated together through the transfer integration device 400 as shown in fig. 3, to achieve more functions. Wherein the electric field generating unit and the electric field processing unit may be integrated in the switching integrated device 400.

The detection results of the displacement detection unit 4 and the shape detection unit can be selectively combined to control the inflation and deflation. The combination mode comprises the following steps:

(1) Triggering the refrigeration equipment 200 to automatically start the deflation kinetic energy by detecting the movement amount of the inner tube 12 when the inner tube 12 moves distally, and triggering the refrigeration equipment 200 to automatically start the inflation function by detecting the state change amount of the balloon 2 when the inner tube 12 moves proximally;

(2) The inner tube 12 is moved distally, the state change amount of the balloon 2 is detected to trigger the refrigeration equipment 200 to automatically start the deflation kinetic energy, and the inner tube 12 is moved proximally, the movement amount of the inner tube 12 is detected to trigger the refrigeration equipment 200 to automatically start the inflation function.

In summary, the ablation catheter and the ablation system provided in the embodiments of the present utility model include: a catheter body, a balloon, and a detection unit; the catheter body comprises an outer tube and an inner tube, the inner tube is movably arranged on the outer tube in a penetrating manner along the axial direction of the outer tube, part of the inner tube penetrates out of the distal end of the outer tube, and the distal end of the outer tube is fixedly connected with the proximal end of the balloon and is connected with the distal end of the inner tube through the balloon; the detection unit comprises a displacement detection unit, wherein the displacement detection unit comprises a variable resistor and a resistance value processing unit; the resistance value of the variable resistor changes along with the movement of the inner tube; the resistance processing unit is used for converting the resistance variation of the variable resistor into the movement amount of the inner tube and feeding back to the equipment end so as to trigger the equipment end to inflate or deflate the balloon. The ablation catheter provided by the embodiment of the utility model is in communication connection with the equipment end for controlling the inflation and deflation of the balloon, and in the process of recovering the balloon to the sheath tube, the equipment end can automatically start the inflation and deflation function according to the movement amount of the inner tube and/or the state change amount of the balloon through the communication between the ablation catheter and the equipment end. Through the design, on one hand, the operation flow can be simplified, the operation can be performed by an operator, and on the other hand, the balloon or the sheath tube can be prevented from being damaged because the balloon cannot be completely recovered to the sheath tube due to the fact that the balloon does not reach the minimum form (is not axially elongated), and the safety of the operation is improved.

In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, so that the same similar parts of each embodiment are referred to each other.

It should also be appreciated that while the present utility model has been disclosed in the context of a preferred embodiment, the above embodiments are not intended to limit the utility model. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art without departing from the scope of the technology, or the technology can be modified to be equivalent. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims (10)

1. An ablation catheter, comprising: a catheter body, a balloon, and a detection unit;

the catheter body comprises an outer tube and an inner tube, the inner tube is movably arranged on the outer tube in a penetrating manner along the axial direction of the outer tube, part of the inner tube penetrates out of the distal end of the outer tube, and the distal end of the outer tube is fixedly connected with the proximal end of the balloon and is connected with the distal end of the inner tube through the balloon;

the detection unit comprises a displacement detection unit, wherein the displacement detection unit comprises a variable resistor and a resistance value processing unit; the resistance value of the variable resistor changes along with the movement of the inner tube; the resistance processing unit is used for converting the resistance variation of the variable resistor into the movement amount of the inner tube and feeding back to the equipment end so as to trigger the equipment end to inflate or deflate the balloon.

2. The ablation catheter of claim 1, wherein the variable resistor comprises a resistive wire that remains relatively fixed to the outer tube and a slip sheet that is disposed on an outer sidewall of the inner tube that moves with movement of the inner tube and remains in contact with the resistive wire.

3. The ablation catheter of claim 2, further comprising a handle secured to a proximal end of the outer tube, the inner tube movably passing through the handle in an axial direction of the handle, the resistance wire being wound into a fixed position within the handle, the slider being held in contact with the resistance wire within the handle.

4. The ablation catheter of claim 3, further comprising a stop assembly comprising a first stop and a second stop, one of the first stop and the second stop being disposed on an outer sidewall of the inner tube, the other being secured to the lumen of the handle, the two being biased to define a maximum displacement of the inner tube distally.

5. The ablation catheter of claim 3, further comprising a resistance assembly including an elastic member and a blocking member, one of the elastic member and the blocking member being attached to an outer sidewall of the inner tube, the other being secured to the lumen of the handle, wherein resistance is generated between the elastic member and the blocking member when the inner tube is moved proximally until the elastic member and the blocking member contact, for characterizing proximal movement of the inner tube will reach an inflation site of the balloon.

6. The ablation catheter of claim 5, wherein the resilient member and the blocking member are partially staggered in a radial direction in a free state, and wherein when the inner tube moves to a maximum resistance between the resilient member and the blocking member, the resilient member deforms into misalignment with the blocking member to release the blocking member from the resilient member.

7. The ablation catheter of claim 6, wherein the resilient member comprises a spring and a first flap, the first flap being secured by the spring, the barrier being a second flap, the first flap and the second flap being partially staggered in a radial direction in a free state.

8. An ablation system, comprising: a freezing device and an ablation catheter as in any one of claims 1-7;

the refrigerating equipment comprises a control unit, wherein the control unit is used for receiving the detection result of the detection unit and controlling the inflation and deflation of the balloon according to the detection result.

9. The ablation system of claim 8, further comprising a display device, wherein the control unit is further configured to be electrically connected to the display device, to convert the state change amount of the balloon detected by the detection unit into a balloon shape, and wherein the display device displays the balloon shape.

10. The ablation system of claim 8, further comprising a switching device for controlling the connection or disconnection between the control unit and the detection unit.

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