Everting transcatheter valve and methods
Described embodiments are directed toward centrally-opening, leaflet valve devices and systems for transcatheter delivery having a two-piece valve body as well as methods of making and delivering the two-piece valve devices. A transcatheter valve includes a collapsed configuration and an expanded configuration. The transcatheter valve can further include an everted configuration and a non-everted configuration.
1. A transcatheter valve comprising:
a multi-part frame defining a flow lumen through which fluid is able to selectively flow, the multi-part frame including,
an outer support portion having a generally tubular shape defining a first lumen,
an evertible support portion having a generally tubular shape, and
a flexible bridge material coupling the evertible support portion to the outer support portion, such that the evertible support portion is transitionable from a first, laterally adjacent position relative to the outer support portion and a second, everted position in which the evertible support portion is at least partially located within the first lumen of the outer support portion; and
a plurality of leaflets coupled to the multi-part frame, each leaflet being moveable between an open position and closed position to selectively block and unblock the flow lumen of the multi-part frame.
2. The transcatheter valve of claim 1 , wherein the flexible bridge material is folded over a distal end of the outer support portion of the multi-part frame when the evertible support portion is transitioned to the everted position.
3. The transcatheter valve of claim 1 , wherein when the evertible support portion is in the first, laterally adjacent position the transcatheter valve has a smaller compressed profile when mounted and compressed onto a delivery catheter in comparison to a compressed profile that is achievable when the evertible support portion is in the second, everted position.
4. The transcatheter valve of claim 1 , wherein the outer support portion has a different stiffness than the evertible support portion.
5. The transcatheter valve of claim 1 , wherein the transcatheter valve is compressed onto a delivery catheter in a collapsed configuration with the support portion located in the first, laterally adjacent position.
6. A transcatheter valve delivery system comprising:
a delivery catheter; and
a transcatheter valve comprising:
a multi-part frame defining a flow lumen through which fluid is able to selectively flow, the multi-part frame including,
an outer support portion having a generally tubular shape defining a first lumen,
an evertible support portion having a generally tubular shape, and
a flexible bridge material coupling the evertible support portion to the outer support portion, such that the evertible support portion is transitionable from a first, laterally adjacent position relative to the outer support portion and a second, everted position in which the evertible support portion is at least partially located within the first lumen of the outer support portion; and
a plurality of leaflets coupled to the multi-part frame, each leaflet being moveable between an open position and closed position to selectively block and unblock the flow lumen of the multi-part frame when the transcatheter valve is in an expanded configuration;
wherein the outer support portion and the evertible support portion are mounted on the delivery catheter in a collapsed configuration with the evertible support portion in the first laterally adjacent position relative to the outer support portion;
wherein the delivery catheter is operable to advance the transcatheter valve to an implantation site.
7. The transcatheter valve delivery system of claim 6 , wherein the evertible support portion comprises a plurality of U-shaped portions each defining a base and a plurality of posts, wherein the base of each U-shaped portion is located proximate to but not in contact with the outer support portion with the U-shaped portions extending away from the outer support portion.
8. The transcatheter valve delivery system of claim 7 , wherein the flexible bridge material extends across the U-shaped portions to form the leaflets.
9. The transcatheter valve delivery system of claim 6 , wherein the delivery catheter comprises a balloon for expanding the transcatheter valve from the collapsed configuration to the expanded configuration.
10. The transcatheter valve delivery system of claim 6 , wherein the delivery catheter comprises a removable sheath to closely fit over the transcatheter valve and retain the transcatheter valve in the collapsed configuration.
11. The transcatheter valve delivery system of claim 6 , further comprising an everter operable to move the evertible support portion from the first, laterally adjacent position to the second, everted position.
12. The transcatheter valve delivery system of claim 11 , wherein the everter is mounted on a shaft of the delivery catheter and is configured to move from a distal position to a proximal position when moving the evertible support portion from the first, laterally adjacent position to the second, everted position.
13. The transcatheter valve delivery system of claim 6 , wherein the outer support portion is more stiff than the evertible support portion.
14. The transcatheter valve delivery system of claim 6 , wherein the bridge material comprises a polymeric material.
15. The transcatheter valve delivery system of claim 6 , wherein the bridge material comprises a laminate having more than one fluoropolymer membrane.
16. The transcatheter valve delivery system of claim 15 , wherein the laminate comprises a layer of elastomer.
17. The transcatheter valve delivery system of claim 6 , wherein the outer support portion comprises a non-shape memory material.
18. The transcatheter valve delivery system of claim 17 , wherein the evertible support portion comprises a shape-memory material.
19. The transcatheter valve delivery system of claim 6 , wherein an aspect ratio of a length of the transcatheter valve to an expanded diameter of the transcatheter valve is less than 1.
20. The transcatheter valve delivery system of claim 6 , wherein the collapsed configuration has a collapsed profile less than about 6 mm.