WO2005092203A1 - Delivery/recovery system for septal occluder - Google Patents
Delivery/recovery system for septal occluder Download PDFInfo
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- WO2005092203A1 WO2005092203A1 PCT/US2005/006703 US2005006703W WO2005092203A1 WO 2005092203 A1 WO2005092203 A1 WO 2005092203A1 US 2005006703 W US2005006703 W US 2005006703W WO 2005092203 A1 WO2005092203 A1 WO 2005092203A1
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- Prior art keywords
- proximal
- occluder
- distal
- mandrel
- delivery
- Prior art date
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/0057—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/0057—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect
- A61B2017/00575—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect for closure at remote site, e.g. closing atrial septum defects
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/0057—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect
- A61B2017/00575—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect for closure at remote site, e.g. closing atrial septum defects
- A61B2017/00592—Elastic or resilient implements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/0057—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect
- A61B2017/00575—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect for closure at remote site, e.g. closing atrial septum defects
- A61B2017/00606—Implements H-shaped in cross-section, i.e. with occluders on both sides of the opening
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/0057—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect
- A61B2017/00575—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect for closure at remote site, e.g. closing atrial septum defects
- A61B2017/00619—Locking means for locking the implement in expanded state
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/0057—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect
- A61B2017/00575—Implements for plugging an opening in the wall of a hollow or tubular organ, e.g. for sealing a vessel puncture or closing a cardiac septal defect for closure at remote site, e.g. closing atrial septum defects
- A61B2017/00623—Introducing or retrieving devices therefor
Definitions
- the present invention relates generally to an occlusion device for the closure of physical anomalies like septal apertures, such as patent foramen ovale and other septal and vascular defects.
- a patent foramen ovale illustrated in FIG. 1, is a persistent, one-way, usually flap-like opening in the wall between the right atrium 11 and left atrium 13 of the heart 10. Because left atrial (LA) pressure is normally higher than right atrial (RA) pressure, the flap usually stays closed. Under certain conditions, however, right atrial pressure can exceed left atrial pressure, creating the possibility that blood could pass from the right atrium 11 to the left atrium 13 and blood clots could enter the systemic circulation. It is desirable that this circumstance be eliminated.
- the foramen ovale serves a desired purpose when a fetus is gestating.
- the circulatory system of a heart in a fetus allows the blood to flow through the foramen ovale as a physiologic conduit for right-to-left shunting.
- the increased left atrial blood flow and pressure results in functional closure of the foramen ovale.
- This functional closure is subsequently followed by anatomical closure of the two over-lapping layers of tissue: septum primum 14 and septum secundum 16.
- septum primum 14 and septum secundum 16 a PFO has been shown to persist in a number of adults.
- Embodiments of a delivery/recovery system allow an operator to deploy and, in many cases, recover a medical implant, such as an occluder for closing a PFO.
- the system includes a delivery mandrel for preventing the occluder from moving in the proximal direction, a delivery wire for securing the occluder to the delivery mandrel and preventing unwanted movement in the distal direction, and a sheath for enveloping the delivery wire, mandrel and occluder.
- the sheath By moving the sheath relative to the occluder in a series of steps, the occluder opens first on a distal side and then on a proximal side, in a manner that locks the occluder in place.
- the system preferably further includes a recovery catheter with claws that can be controlled to grasp a partially deployed occluder and withdrawing the occluder back into the sheath for repositioning or removal.
- a handle can be provided for assisting the operator with manipulations to deliver and /or recover an occluder.
- the handle can include springs for biasing the mandrel and sheath, with knobs for holding these components in desired positions.
- the system can be used with a PFO occluder, such as an occluder with a center joint for passing through the PFO tunnel, and closure components on the distal (left atrial) side and on the proximal (right atrial) side.
- the closure components can include loops, open ended struts, or struts that double back from the center joint to an end of the occluder.
- the occluder preferably also has a catching structure for holding the components in place.
- the occluder can be made of a polymer, nitinol, stainless steel, or other suitable material, and can include a fabric for promoting tissue growth.
- FIG. 1 shows a human heart with anatomical structures relevant to this description
- FIG. 2 is a cross-section of a clover leaf occluder and a delivery/recovery system in its "stowed" configuration;
- FIGS. 3, 4, 5a, 5b and 5c are cross-sectional views that illustrate a sequence of events for using the recovery/delivery system to deploy the clover leaf occluder within the PFO;
- FIGS. 6, 7, 8, 9, 10 and 11 are cross-sectional views that illustrate a sequence of events for using the delivery/recovery system to recover a deployed occluder
- FIG. 12 shows an occluder deployed as described herein
- FIGS. 13 and 14 show an occluder with a locking member having a third stop between the end stops
- FIGS. 15, 16 and 17 show an occluder with a locking member as in FIG. 13, in three stages of deployment;
- FIGS. 18a and 18b show another embodiment of the mandrel tip
- FIG. 19a shows several alterative embodiments of the mandrel tip
- FIG. 19b shows another alternative embodiment of the mandrel tip
- FIGS. 19c through 19e show several embodiments of the distal end of the wire for use with the mandrel tip of FIG. 19b;
- FIG. 19f shows a mandrel with a soft segment added near its distal end
- FIG. 20 shows a handle for use with the occluder delivery/recovery system of
- FIG. 2
- FIGS. 21 through 25 show stages of a delivery sequence using the handle of
- FIG. 20 and,
- FIGS. 26 through 30 show stages of a recovery sequence using the handle of
- FIG. 20 is a diagrammatic representation of FIG. 20.
- FIGS. 31a and 3 lb show another embodiment of an occluder that may be used with some of the delivery systems herein;
- FIG. 32 through 39 show several views of another occluder
- FIGS. 40 through 45 show several further embodiments of occluders
- FIGS. 46 through 48 show still further embodiments of occluders, these with an end cap lock stop. Description Of Invention
- the described embodiment is a delivery/recovery system for deploying and/or removing a device for occluding an aperture within body tissue.
- an occluder may be used for closing a PFO in the atrial septum of a heart.
- Application serial no. 10/890,784, filed July 14, 2004, which is incorporated herein by reference, provides a more detailed description of an occluder that the described embodiment manipulates.
- This occluder has a center joint, opposite ends, and loops extending from the center joint to the ends such that the loops are generally parallel to the PFO tunnel. Because of its shape, the occluder is referred to as a "clover leaf' occluder.
- the embodiments described herein refer to a PFO in particular, the devices and methods of these embodiments may be used to treat other anatomical conditions, such as an atrial septal defect (ASD) or ventricular septal defect (NSD). As such, the invention should not be considered limited to any particular anatomical condition.
- ASD atrial septal defect
- NSD ventricular septal defect
- the embodiments described herein refer to a clover leaf occluder in particular, the devices and methods of these embodiments may be used to deploy other occluders, and other implants in general. As such, the invention should not be considered limited to any particular deploy able implants.
- an occluder can include struts that extend out in a manner like an umbrella, or can have struts that double back from a center joint to ends, with loops that are perpendicular to the PFO tunnel.
- the term "operator” means the person operating the delivery/recovery system to insert an occluder into the body of a patient.
- FIG. 1 illustrates a human heart 10, having a right atrium 11 and a left atrium 13.
- the atrial septum 12 includes septum primum 14, septum secundum 16, and a passage 18 between the right atrium 11 and left atrium 13.
- the anatomy of the septum varies widely within the population.
- septum primum 14 extends to and overlaps with septum secundum 16.
- the septum primum 14 may be quite thin.
- FIG. 1 further shows an outline of the delivery/recovery system 100, described herein, being inserted into the right atrium 11 through the inferior vena cava 20.
- a clover leaf occluder delivery/recovery system 100 includes a clover leaf occluder 102, a delivery wire 104, a mandrel tip 106, a mandrel 108, a recovery catheter 110, recovery claws 112, a delivery/recovery sheath 114, and a catch member 116 of the clover leaf occluder.
- the delivery/recovery system also includes a handle (not shown) that enables the operator to repeatably and efficiently perform the steps described herein. The handle is described in more detail in the sections to follow.
- the occluder 102 and all components of the delivery/recovery system 100 may be advanced into the sheath 114 after the sheath 114 has crossed the PFO 18, and the guide wire has been removed from the sheath 114.
- FIG. 2 shows the clover leaf occluder delivery/recovery system 100 in its "stowed" configuration, i.e., as it is arranged when it is ready to be inserted into a patient.
- the delivery wire 104, the mandrel 108, the recovery catheter 110, and- the delivery/recovery sheath 114 are all disposed in a coaxial arrangement about a longitudinal central axis, with the mandrel 108 disposed about the delivery wire 104, the recovery catheter 110 disposed about the mandrel 108, and the delivery/recovery sheath 114 disposed about the recovery catheter 110.
- the mandrel tip 106 refers to the distal end of the mandrel 108.
- the mandrel 108 extends through the occluder 102 so that the mandrel tip 106 is disposed at the distal end of the catch member 116.
- the delivery wire extends through the mandrel and out of the mandrel tip 106, and is bent at its distal end to form a hook. The bent end of the delivery wire rests against the distal end of the locking member and provides a restraining force for preventing the catch member 116 from moving in the distal direction.
- the mandrel 108 includes a portion at ttne distal end that has a smaller outside diameter, creating a shoulder at the transition. Tr-t-e smaller outside diameter portion fits through the catch member 116, and the shoulder p-rovides a stop against which the proximal end of the catch member 116 rests. The shoulder therefore prevents movement of the catch member 116 in the proximal direction.
- the mandrel 108 has an outside diameter slightly less than, the inside diameter of the locking member, and includes a region having an extended outside diameter for providing a stop (i.e., a bump) against which the proximal end of the locking member 116 rests, to prevent movement of the catch member in the pro>ximal direction.
- the recovery claws 112 are attached to the distal end of the recovery catheter 110, and are spring loaded to tend toward opening, i.e., expansion away from the central axis.
- the distal end of the catch member 116 is fixedly attached to the distal end of the occluder 102.
- FIGS. 3, 4, 5a, 5b and 5c illustrate a sequence of events for using the recovery/delivery system 100 to deploy the clover leaf occluder 102 within the PFO tunnel 18.
- FIG. 3 shows a sheath 114 inserted into the PFO tunnel, with the occluder 102 partially deployed on the left atrial side of the PFO tunnel 18. The operator causes the occluder 102 to exit the sheath 114 by moving the sheath relative to the occluder, preferably by pulling the sheath 114 away from the distal end, while maintaining the mandrel 108 and delivery wire 104 relatively fixed.
- the clover petals of the occluder 102 are free to expand away from the central axis on the left atrial side of the PFO 18.
- the operator pushes the sheath relative to the mandrel 108 and the wire 104, further forcing the clover petals open to extend outwardly in a radial direction (an example in partially deployed form is shown in FIG. 15, with full deployment in FIG. 17). This movement also pushes a central portion 136 of the occluder 102 over the larger diameter proximal end 130 of the locking member.
- the operator again moves the sheath 114 relative to the mandrel 108 and the wire 104, preferably by pulling back on the sheath 114, thereby uncovering the proximal petals of the occluder 102 in the right atrium 11 and allowing these petals to expand away from the central axis.
- the operator then pushes the sheath 114 relative to the mandrel 108 and wire 104 further forcing those clover petals to extend outwardly in a radial direction on the right atrial 11 side of the PFO 18.
- the operator continues to push the sheath relative to the mandrel 108 and wire 104, forcing the proximal end of the occluder over the proximal end of the catch member 116, thereby holding the occluder 102 in its deployed position.
- the operator pulls the sheath 114 relative to the mandrel 108, away from the deployed occluder 102, as shown in FIG. 5a. Withdrawing the sheath 114 from the occluder 102 provides the flexibility necessary to pivot the occluder 102 via the mandrel 108 to a desired position. The operator can then determine whether the occluder 102 is properly deployed with respect to the PFO tunnel 18, using techniques such as transesophageal or intracardiac echo, and/or fluoroscopy. If the operator deems the occluder 102 to be properly deployed, the operator pulls on the delivery wire 104 while holding the mandrel 108 in a fixed position.
- the bend at the distal end of the delivery wire 104 straightens against the mandrel tip 106, and the wire 104 withdraws into the mandrel 108 (FIG. 5b).
- the bend in the distal end of the wire 104 is gone, there is no longer a restraining force preventing the catch mechanism 116 from moving in the distal direction, and the operator disengages the mandrel 108 from the catch member 116 (FIG. 5c).
- the operator could straighten the bend in the wire 104 by holding the delivery wire 104 in a fixed position and pushing on the mandrel 108, or by a combination of pulling on the wire 104 and pushing on the mandrel 108.
- FIGS. 6 through 11 illustrate a sequence of steps described in detail below. From the position shown in FIG. 5a, the operator pushes longitudinally on the recovery catheter 110 with respect to the sheath 114. Doing so causes the sheath 114 to uncover the recovery claws 112, removing a restricting force from the spring-loaded recovery claws 112, and allowing the claws 112 to expand away from the central axis, as shown in FIG. 6.
- the operator continues to push the recovery catheter 110 relative to the sheath until the claws 112 surround the proximal end of the occluder 102.
- the operator then pushes the sheath 114 longitudinally relative to the recovery catheter 110 until the sheath covers the claws 112, thereby closing the claws 112 on the proximal end of the occluder 102, as shown in FIG. 7.
- the operator pushes the mandrel 108 longitudinally relative to the recovery catheter 110, forcing the proximal stop 130 of the catch member 116 through the proximal end of the occluder 102 in a distal direction, as shown in FIG. 8.
- the mandrel 108 pushes the proximal stop 130 of the catch member 116 through the occluder center joint 136, and the occluder elongates, so that the clover petals of the occluder retract toward the central axis, as shown in FIGS. 9 and 10.
- the operator pulls the recovery catheter 110 longitudinally relative to the sheath 114, so that the claws 112 pull the elongated occluder 102 back into the sheath 114. Once the sheath 114 covers the occluder 102, as shown in FIG. 11, the operator can remove the delivery/recovery system 100 from the patient.
- FIG. 12 shows an occluder 102 deployed as described above.
- the catch member 116 in this embodiment includes a proximal stop 130 and a distal stop 132.
- the diameter A of the proximal stop 130 is greater than the inside diameter D of the occluder 102
- the diameter B of the distal stop 132 is greater than the diameter A of the proximal stop 130.
- distal stop 132 should be fixedly connected to the rest of the occluder and thus should not be movable with respect to the end of the occluder at any time, while the portions of the occluder move over the proximal end to lock the occluder in place.
- the catch member 116a has a third stop 134 between the proximal stop 130 and the distal stop 132.
- the third stop 134 provides an intermediate stop for the center joint 136 of the occluder 102.
- the diameter A of the proximal stop 130 is greater than the inside diameter D of the occluder 102
- the diameter B of the distal stop 132 is greater than the diameter A of the proximal stop 130
- the diameter C of the intermediate stop 134 is approximately equal to the proximal stop 130.
- the third stop 134 allows the distal petals 138 of the occluder 102 to maintain their form prior to the engagement of the proximal stop 130, and in the event the proximal stop 130 fails.
- FIGS. 15, 16 and 17 show a clover leaf occluder 102 in three stages of deployment with a three stop catch member 116a.
- FIG. 15 shows the occluder 102 with the distal end against the distal stop 132
- FIG. 16 shows the occluder 102 with the center joint locked with the intermediate stop 134
- FIG. 17 shows the occluder 102 completely deployed with the distal end locked against the distal stop 132, the center joint 136 held against the intermediate stop 134, and the proximal end held against the proximal stop 130.
- One embodiment includes a self-locking mandrel tip 106a as shown in FIGS. 18a and 18b.
- This mandrel tip 106a eliminates the need for a bend at the end of the delivery wire 104 by including an L-shaped extension 140 that is preferably biased toward the center axis AX.
- the mandrel tip 106a can pass relatively unimpeded through the axial passage in the catch member 116.
- the wire 104a forces the L-shaped extension 140 away from the center axis and beyond the inside diameter envelope of the catch member.
- the L-shaped extension 140 impedes passage through the catch member 116, and performs the same function that the bent wire 104 provided in the earlier-described embodiment. Removing the wire 104a allows the L-shaped extension 140 to return to its former biased position, again allowing relatively unimpeded passage through the locking member 116.
- Other alternative shapes for the mandrel tip 106a are shown in FIG. 19a. All of these examples allow easier passage through the locking member 116 without a delivery wire 104a inserted than with a delivery wire 104a inserted, and all of these examples operate without requiring a bend in the distal end of the delivery wire and the associated force required to remove it.
- FIG. 19b shows another embodiment of a self-catching mandrel tip 106c having an aperture 150 in the side wall of the mandrel.
- the delivery wire 104 passes through this aperture 150 rather than extending out through the distal end of the mandrel as in the previously-described embodiments.
- the distal end 152 of the delivery wire in this embodiment has a hook that restricts the distal stop 132 of the catch member 116, and/or the distal end of the occluder 102, from movement in the distal direction.
- Other possible shapes for the distal end 152 of the delivery wire 104 may also be used, for example those shown in FIGS. 19c, 19d and 19e. The shape shown in FIG.
- 19e uses a wire that is thinner than the other embodiments shown, so that a pair of wires pass through the mandrel.
- the force required to "unbend" the hook is isolated to the rim of the aperture 150. Since the mandrel is preferably made of stainless steel or another similarly hard material, the rim of the aperture 150 can withstand that force without significant deformation.
- FIG. 19f shows a mandrel with a soft segment 156 added near the distal end of the mandrel to improve pivoting between the delivery system and the implant.
- the soft segment is made of a martensitic or R-phase tube segment 156 attached to the proximal portion 158 of the mandrel and the distal portion 160 of the mandrel via any of several appropriate techniques known in the art.
- a titanium sleeve 162 may be used to attach the segment 156 via welding or crimping to the proximal portion 158 and the distal portion 160 of the mandrel, as shown in FIG. 19f.
- the proximal portion 158 and the distal portion 160 of the mandrel may be made of stainless steel to provide a more cost effective system than having the entire mandrel made of a martensitic or R-phase material (e.g., nitinol).
- a martensitic or R-phase material e.g., nitinol
- Other metals and/or polymers may alternatively be used to achieve similar results.
- a handle 200 for this embodiment of an occluder delivery/recovery system 100 performs many of these manipulations with minimal input from the operator, so that a polymer may be deployed almost as easily as, and in some cases easier than, a metal device. By carefully controlling and regulating the applied forces, the handle 200 also protects the implant devices from overstressing that can occur with manual manipulations. Elements of the handle also have general applicability to metal implant devices.
- FIG. 20 shows a handle 200 for use with the occluder delivery/recovery system 100 described herein.
- the general procedure for inserting and/or removing an implant is similar to that described in connection with FIGS. 3-14, above.
- the handle 200 includes a delivery knob 202 attached to the sheath 114, and operates between two primary positions, as further described herein.
- a separator 204 separates recovery and delivery springs, and provides a small amount of compression to the springs in their most extended configuration.
- a recovery knob 206 attaches to the recovery catheter 110 and operates between two primary positions as further described herein.
- a mandrel knob 208 attaches to the mandrel 108 and operates between two primary positions, as further described herein.
- a delivery wire knob 210 attaches to the delivery wire 104 and the mandrel 108.
- a delivery spring 212 compresses between the delivery knob 202 and the separator 204, so that withdrawal of the delivery knob 202 away from the occluder 202 compresses the delivery spring 212.
- a recovery spring 214 is disposed between the recovery knob 206 and the separator 204, so that advancing the recovery knob 206 toward the occluder 102 compresses the recovery spring 214.
- a handle housing 216 provides a casing for the other handle components and restricts their movements to within predetermined ranges.
- the casing may have an ergonomic design so that the various components are easily accessible to the operator, and the required manipulations can be performed in an efficient and repeatable manner.
- a detachment screw 218 mates with the delivery wire knob 210, and is fixedly attached to the delivery wire 104. Rotating the detachment screw 218 incrementally pulls on the delivery wire 104 with significant force, but in a controlled manner, pulling the bend in the distal end ofthe delivery wire 104 against the mandrel tip 106, thereby straightening the bend and releasing the implant from the delivery/recovery system 100.
- the delivery sequence for deploying an occluder 102 using the handle 200 begins with the distal end of the delivery/recovery system 100 inserted through the PFO tunnel 18 from the right atrial side and extended partially into the left atrium 13.
- the term “retract” means to pull away, longitudinally, from the distal end of the delivery/recovery system 100.
- the term “advance” means to push, longitudinally, toward the distal end of the delivery/recovery system 100.
- the operator begins the delivery sequence by retracting the delivery knob 202 from position I to position II, which compresses the delivery spring 212 and uncovers the distal half of the occluder 102, as shown in FIG. 21.
- the sheath 114 pressing against the proximal occluder petals forces the proximal end of the occluder 102 over the proximal stop of the catch member 116, thereby locking the occluder 102 in its deployed position.
- the operator determines that the occluder 102 is in the proper position, the operator removes the bend in the distal end of the delivery wire 104 by turning the detachment screw 218, which pulls the bend against the mandrel tip 106 and forces the bend to straighten. The operator then pulls the mandrel away from the deployed occluder 102 and removes the delivery/recovery system 100 from the patient.
- the operator determines that the occluder 102 is not in the proper deployed position, the operator begins the recovery sequence by advancing the recovery knob 206 from position HI to position IN, compressing the recovery spring 214 and advancing the claws 212 outside of the sheath 114 and toward the proximal end of the occluder 102. The operator then releases the delivery knob 202 from the locked position II to position I, which forces the sheath 114 over the claws 112, clamping the claws onto the proximal end of the occluder 102, as shown in FIG. 26.
- the spring force of the compressed recovery spring 214 pushes the recovery knob 206 from position IV to position HI, which causes the claws 112 to pull the proximal half of the occluder 102 into the sheath, along with the mandrel knob 208 from position VI to position N to completely withdraw the proximal petals of the occluder 102 into the sheath 114, as shown in FIG. 28.
- the operator advances the mandrel knob 208 from position N to position NI, which allows the distal petals of the occluder 102 to relax and elongate, as shown in FIG. 29.
- the mandrel knob 208 retracts automatically (via spring force, or in some cases with assistance from the operator) from position NI to position N, withdrawing the occluder completely into the sheath 114, as shown in FIG. 30.
- the sheath may be left behind to allow for another delivery.
- the operator may remove the recovered occluder 112 and the delivery/recovery system 100 from the patient, or redeploy it.
- the delivery system can be used with other embodiments that have internal interference catching systems.
- These systems typically include components that pass through a center joint of an implant along a longitudinal axis.
- This type of catch member typically has a section or sections with a larger outside diameter (OD) than the inside diameter (ID) of the implant, so the catch member can engage the implant in one of several ways, such as: (a) the section of the catch member with a larger OD compresses during the catching process as the catch member passes through the implant, and/or (b) the implant ID increases during the catching process as the catch member passes through the implant.
- FIG. 31a illustrates another embodiment of a septal occluder that may be delivered using a system of the type described herein.
- an occluder 520 in a deployed position has a distal (left atrial) side 522 and a proximal side 524, each with four petals.
- a catch mechanism 530 has a distal ball 532, a proximal ball 534, and a rod 536 connecting balls 532 and 534.
- Balls 532, 534 and rod 536 can each have a central bore (not shown) to allow catch mechanism 530 to be delivered with occluder 520 over a guide wire, and can allow a bent wire to pass through as in FIGS. 2 and 3.
- Other types of occluders for example, those with petals having solid or mesh surfaces, or those with tissue scaffolds may also be used.
- FIG. 3 lb is a side view showing occluder 520 with left atrial side 522 and a right atrial side 524, each in contact with septum secundum 516 and septum primum 514.
- a device of this type can be formed by making cuts or slits in a tube and compressing the ends.
- the tube can be made of a polymer.
- the device can be made of a polymer that can be bioresorbable or not bioresorbable.
- FIG. 32 shows an occluder with a ball and string for catching and holding a device mechanism.
- the distal ball 1130 engages the distal joint 1110
- the proximal ball 1132 is disposed along the delivery string 1134 between the distal joint 1110 and the center joint 1108.
- FIGS. 33 through 36 show the delivery sequence for the ball and string mechanism of FIG. 32.
- a shown in FIG. 33 the distal portion of the occluder is deployed from the delivery sheath 1136 on the left atrial side of the PFO.
- FIG. 34 shows the proximal ball 1132 pulled through the center joint 1108, thereby locking the distal portion of the occluder.
- FIG. 35 shows the proximal portion of the occluder deployed from the delivery sheath 1136 on the right atrial side of the PFO.
- FIG. 36 shows the proximal ball 1132 pulled through the proximal joint 1106, thereby locking the proximal portion of the occluder. Detaching wire 1134 from ball 1132 is the step remaining to complete the delivery of the occluder in the PFO.
- FIGS. 37 through 39 show a recovery sequence for removing an occluder, such as that delivered in the manner shown in FIGS. 33 through 36.
- FIG. 37 shows the delivery sheath 1136 disposed against the proximal end of the occluder.
- Wire 1134 has been pulled with sufficient force to pull ball 1130 through the distal joint 1110 thereby allowing the distal side of the occluder to start to return toward a tubular shape.
- FIG. 38 shows the distal ball 1130 further pulled through the center joint 1108, and up against the proximal joint 1106, so the right atrial side starts to lose its compressive force.
- FIG. 37 shows the delivery sheath 1136 disposed against the proximal end of the occluder.
- Wire 1134 has been pulled with sufficient force to pull ball 1130 through the distal joint 1110 thereby allowing the distal side of the occluder to start to return toward a tubular shape.
- FIG. 38 shows the distal ball 1130 further pulled through the center
- FIG. 39 shows the unlocked occluder after it has been retracted back into the delivery sheath and out of the PFO by advancing the sheath, retracting the device, or some combination of these motions.
- Another method for recovering the device is using a method similar to that shown in a provisional application entitled “Closure Device With Hinges”, provisional application no. 60/569,203, filed May 7, 2004, which is incorporated herein by reference. In that method, a set of claws is used to grip and pull the device, starting with the proximal joint.
- the balls need not be preferably spherical, but could be altered, such as having a distal ball with a flattened distal end.
- the balls can have bores, and a bent wire or other mechanism can prevent the occluder from moving in a distal direction when it is desirable to prevent such movement.
- FIGS. 40 and 41 show one type of two elements catching system, including multiple pairs of balls distributed along a pair of strings.
- a first ball 1360 and a second ball 1362 are fixedly attached to a first string 1364 (or wire or suture).
- the distal end of the first string 1364 is releasably attached to a ball 1365 that is part of the distal joint 1110, either held to the distal end by the tension, or fixedly connected to the distal end.
- the proximal end of the first string 1364 extends out through a center joint 1108 and a proximal joint 1106 to the operator.
- a third ball 1366 and a fourth ball 1368 are fixedly attached to a second string 1370.
- the distal end of the second string 1370 is releasably attached to the ball 1365 at the distal joint 1110, and the proximal end of the second string 1370 extends out through the center joint 1108 and the proximal joint 1106 to the operator.
- the length of the first string 1364 from the first ball 1360 to the distal joint is the same as the length of the second string 1370 from the third ball 1366 to the distal joint 1110.
- the length of the first string between the first ball 1360 and the second ball 1362 is the same as the length of the second string 1370 from the third ball 1366 to the fourth ball 1368.
- At least one of the strings can be elastic, in this case string 1364, so that one of the strings may be stretched to stagger the balls along the longitudinal axis, as shown in FIG. 40.
- Each of the strings 1364 and 1370 can include multiple string segments.
- the strings can be fixedly connected to the respective balls if a mechanism is provided to cut the strings after delivery.
- the operator pulls one of the strings in a proximal direction to stagger the first and third balls, and the second and fourth balls. While the balls are staggered, the operator pulls both strings until the first ball 1360 and the third ball 1366 are on the proximal side of the center joint 1108, and the second ball 1362 and the fourth ball 1368 are on the proximal side of the proximal joint 1106. The operator then releases the string that is in elastic tension, so as to return the first third and the second/fourth ball pairs in the side-by-side configuration. When the first/third ball and the second/fourth pairs are in side-by-side configuration, as shown in FIG. 41, the pairs cannot pass through the center joints, thereby locking the occluder. The strings are then detached or cut from the device to complete delivery.
- first string 1364 and second string 1370 may be one continuous string that passes through the distal joint and can slide along a fixed or rotatable axle, so that the distal joint 1110 acts as a pulley. The operator pulls on one of the strings to stagger or realign the ball pairs.
- FIGS. 42 and 43 show yet another two element catching system for an occluder.
- a first ball 1380 and a second ball 1382 are fixedly attached to a string 1384 (or wire, suture, or tube).
- the distal end of the string 1384 is fixedly attached to a ball 1385 that forms part of the distal joint 1110, and the proximal end of the string 1384 passes through the center joint 1108 and the proximal joint 1106 and out to the operator.
- the operator pulls the string 1384 until the occluder stops against a delivery sheath 1386.
- the operator continues to pull the string 1384 until the first ball 1380 is on the proximal side of the center joint 1108 and the second ball 1382 is on the proximal side of the proximal joint 1106.
- the operator then inserts a rod 1388 through the proximal joint 1106, the center joint 1108, and the distal joint 1110, as shown in FIG. 43.
- the outside diameter of the rod 1388 is large enough to prevent either ball from passing through a center joint while the rod 1388 is disposed within the center joints as shown in FIG. 43.
- the string 1384 may include multiple string segments. The method of using claws, as referred to in conjunction with FIGS. 37-39, could also be used here to recover the device.
- FIGS. 44 and 45 illustrate another embodiment similar to that shown in FIGS. 42 and 43.
- a tube 1389 with an outside diameter slightly smaller than the inside diameter of the center joints includes two apertures in the side wall, each large enough for a first ball 1390 or a second ball 1391 to pass.
- a string 1392 attaches the first ball 1390 to the second ball 1392.
- the operator deploys the occluder within the PFO by moving the distal joint 1110 toward the proximal joint 1106, using any one of several delivery techniques described herein or known in the art. The operator then inserts the rod 1393, thereby retaining each ball in its respective aperture.
- FIGS. 46-48 show an embodiment of an end cap catching mechanism, including a catch member 1400 with a proximal ball 1402 fixedly attached to its proximal end, and its distal end fixedly attached to the distal joint 1110.
- This embodiment shows the distal end of the catch member 1400 fixedly attached to a ball 1405 having an outside diameter larger than the inside diameter of the distal joint 1110, although other techniques of securing the distal end of the catch member 1400 to the distal joint may also be used.
- the outside diameter of the proximal ball 1402 may be slightly less than the inside diameter of the center joint 1108 and the proximal joint 1106.
- a detachable delivery wire 1404 (or delivery shaft) attaches to the proximal ball 1402, and a cap 1406 is disposed about the delivery wire 1404 on the proximal side of the locking ball 1402.
- the operator engages this catch mechanism by pulling on the delivery wire 1404 so as to pull the distal joint 1110 in a proximal direction toward the proximal joint 1106.
- the proximal ball 1402 is on the proximal side of the proximal joint 1106, as shown in FIG. 47, the operator pushes the cap 1406 over the ball 1402.
- the ball 1402 deforms cap 1406, expanding the inside diameter of the cap 1406.
- the cap 1406 returns to its original shape, resisting the ball 1402 from passing back through the cap 1406 in a distal direction.
- the delivery wire 1404 is then detached from ball 1402 if releasably attached to it, or is cut to sever the connection to ball 1402.
- the cap has threads on its distal side, so that the cap 1406 can be screwed onto mating threads disposed on the outside of the proximal portion of the proximal joint 1106.
- a claw can be used to grip the ball 1402.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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CA002558247A CA2558247A1 (en) | 2004-03-03 | 2005-03-02 | Delivery/recovery system for septal occluder |
JP2007501924A JP2007526087A (en) | 2004-03-03 | 2005-03-02 | Delivery / recovery system for septal occluder |
EP05724278A EP1737349A1 (en) | 2004-03-03 | 2005-03-02 | Delivery/recovery system for septal occluder |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US54974104P | 2004-03-03 | 2004-03-03 | |
US60/549,741 | 2004-03-03 | ||
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PCT/US2005/006703 WO2005092203A1 (en) | 2004-03-03 | 2005-03-02 | Delivery/recovery system for septal occluder |
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US (4) | US7871419B2 (en) |
EP (1) | EP1737349A1 (en) |
JP (1) | JP2007526087A (en) |
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WO (1) | WO2005092203A1 (en) |
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Also Published As
Publication number | Publication date |
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JP2007526087A (en) | 2007-09-13 |
CA2558247A1 (en) | 2005-10-06 |
US7871419B2 (en) | 2011-01-18 |
EP1737349A1 (en) | 2007-01-03 |
US20110112633A1 (en) | 2011-05-12 |
US8568431B2 (en) | 2013-10-29 |
US20140088640A1 (en) | 2014-03-27 |
US8945158B2 (en) | 2015-02-03 |
US20050267523A1 (en) | 2005-12-01 |
US20150148841A1 (en) | 2015-05-28 |
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