Prosthetic valve with appendages
An implant includes a prosthetic valve and is transitionable from a compressed to an expanded state. The implant includes a frame assembly including a plurality of struts that collectively define an upstream-frame-assembly-perimeter at an upstream end of the frame assembly and a downstream-frame-assembly-perimeter at a downstream end of the frame assembly. The frame assembly includes a valve frame that defines a lumen, and one or more appendages disposed at and extending in a downstream direction from the downstream-frame-assembly-perimeter. A plurality of prosthetic leaflets are disposed within the valve frame lumen and facilitate one-way upstream-to-downstream fluid flow through the lumen. The implant includes a fabric and, in the expanded state of the implant, the fabric obscures the one or more appendages and defines a downstream perimeter of the fabric at a downstream end of the implant. Additional embodiments are described.
1. Apparatus, comprising:
(i) an implant comprising a prosthetic valve for use at a native heart valve, the implant being transitionable from a compressed state to an expanded state, the implant comprising:
a frame assembly comprising a plurality of struts that collectively define an upstream-frame-assembly-perimeter at an upstream end of the frame assembly and a downstream-frame-assembly-perimeter at a downstream end of the frame assembly, the frame assembly comprising:
a valve frame that circumscribes a longitudinal axis and defines a lumen along the axis; and
one or more appendages disposed at and extending in a downstream direction from the downstream-frame-assembly-perimeter;
a plurality of prosthetic leaflets, disposed within the lumen of the valve frame, and arranged to facilitate one-way upstream-to-downstream fluid flow through the lumen; and
a covering, which comprises (a) at least one fabric sheet and (b) a tissue-protective material that circumscribes the lumen of the valve frame,
wherein when the implant is in the expanded state; the covering obscures radially outward facing surfaces of the one or more appendages, and the tissue-protective material of the covering is shaped so as to define a downstream perimeter at a downstream end of the implant; and (ii) a delivery tool comprising a mount reversibly couplable to the implant via the one or more appendages when the implant is in the compressed state.
2. The apparatus according to claim 1 , wherein the implant further comprises a plurality of atrial anchoring arms and a plurality of ventricular anchoring legs configured to extend radially outward from the valve frame.
3. The apparatus according to claim 1 , wherein the tissue-protective material is attached to the frame assembly.
4. The apparatus according to claim 3 , wherein the tissue-protective material is attached to the valve frame of the frame assembly.
5. The apparatus according to claim 3 , wherein the frame assembly comprises an outer frame that circumscribes the valve frame, and wherein the tissue-protective material is attached to the valve frame and to the outer frame.
6. The apparatus according to claim 1 , wherein the valve frame defines the one or more appendages.
7. The apparatus according to claim 6 , wherein:
the valve frame defines the plurality of struts,
the plurality of struts are shaped so as to define a plurality of cells each having (i) a first diameter and a first height in the compressed state of the implant, and (ii) a second diameter and a second height in the expanded state of the implant, the second diameter being larger than the first diameter and the second height being shorter than the first height, and
as the implant transitions from the compressed state to the expanded state, the plurality of cells assume the second height to draw the one or more appendages in an upstream direction and to an upstream position in which the covering obscures the one or more appendages.
8. The apparatus according to claim 6 ,
wherein the valve frame defines the plurality of struts, which are arranged in one or more rings including a downstream ring that is defined by a pattern of alternating peaks and troughs, wherein the peaks are further upstream than the troughs, wherein the troughs are at the downstream end of the frame assembly, and wherein the troughs are at respective junctions connecting respective pairs of strut segments of the struts, and
wherein the one or more appendages extend downstream from respective troughs, disposed entirely downstream of respective junctions.
9. The apparatus according to claim 8 , wherein a number of the troughs of the downstream ring is greater than a number of the appendages.
10. The apparatus according to claim 1 , wherein the delivery tool comprises a capsule configured to surround the implant when the implant is in the compressed state, and wherein the capsule is configured to retain the one or more appendages engaged with the mount by retaining the implant in the compressed state.
11. The apparatus according to claim 1 , wherein the one or more appendages are shaped to define respective catches at respective downstream ends of the one or more appendages, and wherein the catches are configured to reversibly engage the mount.
12. The apparatus according to claim 1 , wherein the one or more appendages are shaped to define respective bulbous elements at respective downstream ends of the one or more appendages, and wherein the bulbous elements are configured to reversibly engage the mount.
13. The apparatus according to claim 1 , wherein the tissue-protective material comprises a polymer ring.
14. A method, comprising:
delivering to a native heart valve a heart of a patient an implant in a compressed state thereof, the implant including a prosthetic valve for use at the native heart valve and including:
a frame assembly including a plurality of struts that collectively define an upstream-frame-assembly-perimeter at an upstream end of the frame assembly and a downstream-frame-assembly-perimeter at a downstream end of the frame assembly, the frame assembly including:
a valve frame that circumscribes a longitudinal axis and defines a lumen along the axis; and
one or more appendages disposed at and extending in a downstream direction from the downstream-frame-assembly-perimeter;
a plurality of prosthetic leaflets, disposed within the lumen of the valve frame, and arranged to facilitate one-way upstream-to-downstream fluid flow through the lumen; and
a covering, which includes (a) at least one fabric sheet and (b) a tissue-protective material that circumscribes the lumen of the valve frame; and
exposing at least a portion of the implant in a chamber of the heart and by the exposing, allowing the implant to transition to an expanded state of the implant, in which the covering obscures radially outward facing surfaces of the one or more appendages, and the tissue-protective material of the covering is shaped so as to define a downstream perimeter at a downstream end of the implant, wherein delivering the implant comprises delivering the implant, when the implant is in the compressed state, using a delivery tool including a mount reversibly couplable to the one or more appendages.
15. The method according to claim 14 , wherein:
the plurality of struts are shaped so as to define a plurality of cells each having (i) a first diameter and a first height in the compressed state of the implant, and (ii) a second diameter and a second height in the expanded state of the implant, the second diameter being larger than the first diameter and the second height being shorter than the first height, and
allowing the implant to transition to the expanded state of the implant comprises drawing the one or more appendages in an upstream direction and to an upstream position in which the covering obscures the one or more appendages, as the plurality of cells assume the second height.
16. The method according to claim 14 , wherein:
the delivery tool includes a capsule surrounding the implant in the compressed state,
delivering the implant comprises retaining the one or more appendages engaged with the mount by retaining the implant in the compressed state by the capsule, and
exposing the at least the portion of the implant comprises exposing the at least the portion of the implant from within the capsule, and by the exposing, allowing the one or more appendages to move away from the mount.
17. The method according to claim 14 , wherein the valve frame defines the one or more appendages.
18. The method according to claim 17 ,
wherein the valve frame defines the plurality of struts, which are arranged in one or more rings including a downstream ring that is defined by a pattern of alternating peaks and troughs, wherein the peaks are further upstream than the troughs, wherein the troughs are at the downstream end of the frame assembly, and wherein the troughs are at respective junctions connecting respective pairs of strut segments of the struts, and
wherein the one or more appendages extend downstream from respective troughs, disposed entirely downstream of respective junctions.
19. The method according to claim 18 , wherein a number of the troughs of the downstream ring is greater than a number of the appendages.
20. The method according to claim 14 , wherein the tissue-protective material comprises a polymer ring.
21. The method according to claim 14 , wherein the tissue-protective material is attached to the frame assembly.
22. Apparatus, comprising:
an implant comprising a prosthetic valve for use at a native heart valve, the implant being transitionable from a compressed state to an expanded state, the implant comprising:
a frame assembly comprising a plurality of struts that collectively define an upstream-frame-assembly-perimeter at an upstream end of the frame assembly and a downstream-frame-assembly-perimeter at a downstream end of the frame assembly, the frame assembly comprising:
a valve frame that circumscribes a longitudinal axis and defines a lumen along the axis;
an outer frame that circumscribes the valve frame; and
one or more appendages disposed at and extending in a downstream direction from the downstream-frame-assembly-perimeter;
a plurality of prosthetic leaflets, disposed within the lumen of the valve frame, and arranged to facilitate one-way upstream-to-downstream fluid flow through the lumen; and
a covering, which comprises (a) at least one fabric sheet and (b) a tissue-protective material that circumscribes the lumen of the valve frame,
wherein when the implant is in the expanded state: the covering obscures radially outward facing surfaces of the one or more appendages, and the tissue-protective material of the covering is shaped so as to define a downstream perimeter at a downstream end of the implant.
23. The apparatus according to claim 22 , wherein:
the valve frame defines a valve body and a plurality of upstream arms, and
the outer frame defines a plurality of downstream legs.
24. The apparatus according to claim 22 , wherein the valve frame defines the one or more appendages.