Methods and devices for delivery of a prosthetic valve
Methods of assembling and delivering a valve prosthesis and delivery system are disclosed herein. A method can include housing a valve prosthesis in a compacted state within a sheath of a delivery system. The valve prosthesis can include a valve anchor and a support frame coupled to the valve anchor, and the valve anchor can include a plurality of anchoring legs having a plurality of connection apertures. The method can further include slidably coupling a pin assembly around a core member so that the pin assembly is slidable longitudinally along the core member, and inserting a plurality of pins of the pin assembly through the plurality of connection apertures of the valve anchor and a plurality of lock apertures of the delivery system to engage the plurality of anchoring legs of the valve anchor.
1. A method for delivering a valve prosthesis to a target location in a vessel of a subject, the method comprising:
introducing a delivery system into the vessel to position a valve anchor at the target location, the delivery system comprising a nose cone;
proximally retracting a sheath of the delivery system to permit anchoring members of the valve anchor to expand for anchoring the valve anchor at the target location while maintaining engagement between an anchoring leg of the valve anchor and an engagement mechanism of the delivery system, the engagement mechanism comprising a pusher component, a pin assembly, and a lock component; and
distally advancing the pusher component relative to a core member of the delivery system to contact and distally advance the pin assembly relative to the lock component and the sheath and towards the nose cone to disengage the pin assembly from the lock component, thereby permitting release of the anchoring leg of the valve anchor from the delivery system.
2. The method of claim 1 , wherein the anchoring members comprise U-shaped members, and wherein the method further comprises advancing the anchoring members into respective valve structures at the target location.
3. The method of claim 2 , wherein the target location comprises an aortic valve and the valve structures comprise aortic valve sinuses.
4. The method of claim 1 , wherein the pin assembly comprises a pin that extends through an engagement region and a lock aperture of the lock component in an engaged configuration to engage the anchoring leg within the engagement region, and wherein the distally advancing comprises advancing the pin of the pin assembly through the lock aperture and through the engagement region to permit disengagement of the anchoring leg.
5. The method of claim 1 , wherein the pin assembly comprises a tubular component extending proximally from the pin assembly along the core member, and wherein the distally advancing comprises contacting a distal surface of the pusher component against a proximal surface of the tubular component.
6. The method of claim 1 , further comprising, after the valve anchor is released, expanding a support frame of the valve prosthesis within a lumen of the valve anchor.
7. The method of claim 1 , wherein a distal end portion of the delivery system is advanced to a defective valve at the target location in a direction opposite to that of blood flow.
8. The method of claim 1 , wherein the proximally retracting the sheath is performed while holding a support frame of the valve prosthesis stationary along a longitudinal axis of the valve prosthesis until the support frame expands radially.
9. A method for delivering a valve prosthesis to a target location in a vessel of a subject, the method comprising:
introducing a delivery system into the vessel to position a valve anchor at the target location, the delivery system comprising a core member and a nose cone;
proximally retracting a sheath of the delivery system to permit the valve anchor to expand at the target location and maintaining an engagement mechanism in an engaged configuration; and
distally advancing a pusher component of the engagement mechanism relative to the core member to distally advance the engagement mechanism relative to the valve anchor and the sheath and towards the nose cone to move the engagement mechanism into a released configuration, thereby permitting release of one or more U-shaped members of the valve anchor into one or more native valve structures.
10. The method of claim 9 , wherein maintaining the engagement mechanism in the engaged configuration comprises extending one or more pins of the engagement mechanism through one or more corresponding lock apertures of the engagement mechanism.
11. The method of claim 9 , wherein maintaining the engagement mechanism in the engaged configuration comprises extending one or more pins of the engagement mechanism through one or more corresponding leg connection apertures of the valve anchor.
12. The method of claim 9 , wherein shifting the engagement mechanism into the released configuration comprises sliding one or more pins of the engagement mechanism out of one or more corresponding lock apertures of the engagement mechanism.
13. The method of claim 9 , wherein shifting the engagement mechanism into the released configuration comprises sliding one or more pins of the engagement mechanism out of one or more corresponding leg connection apertures of the valve anchor.
14. The method of claim 9 , wherein the target location comprises an aortic valve and the one or more native valve structures comprise aortic valve sinuses.
15. The method of claim 9 , wherein the engagement mechanism comprises a pin assembly with a tubular component that extends proximally from the pin assembly along the core member, and wherein distally advancing the pusher component comprises contacting a distal surface of the pusher component against a proximal surface of the tubular component.
16. The method of claim 9 , wherein the engagement mechanism comprises a pin assembly with a piston member and a lock component with a cavity, wherein distally advancing the pusher component comprises causing the piston member to move distally within the cavity.
17. The method of claim 9 , further comprising, after the U-shaped members are released, expanding a support frame of the valve prosthesis within a lumen of the valve anchor.
18. The method of claim 9 , wherein a distal end portion of the delivery system is advanced to a defective valve at the target location in a direction opposite to that of blood flow.
19. The method of claim 9 , wherein the proximally retracting the sheath is performed while holding a support frame of the valve prosthesis stationary along a longitudinal axis of the valve prosthesis until the support frame expands radially.
20. A method for delivering a valve prosthesis to a target location in a vessel of a subject, the method comprising:
introducing a delivery system into the vessel to position a valve anchor at the target location;
proximally retracting a sheath of the delivery system to permit anchoring members of the valve anchor to expand for anchoring the valve anchor at the target location while maintaining engagement between an anchoring leg of the valve anchor and an engagement mechanism of the delivery system, the engagement mechanism comprising a pusher component, a pin assembly with a piston member, and a lock component having a cavity; and
distally advancing the pusher component relative to a core member of the delivery system to contact and distally advance the pin assembly relative to the lock component to move the piston member distally within the cavity and disengage the pin assembly from the lock component, thereby permitting release of the anchoring leg of the valve anchor from the delivery system.