Inverted leaflet prosthetic valve
Prosthetic valve embodiments are described herein that include a frame and a valve member mounted within the frame. The valve members can have a plurality of leaflets that are affixed to one another along their inflow edges, with articulating edges projecting from the inflow edges in the outflow direction. In an open configuration, the articulating edges can be collapsed radially inward by the forward flow of blood through the prosthetic valve, thereby creating a plurality of discrete flow areas between the frame and the inflow edges of the leaflets. In a closed configuration, the leaflets can be pushed radially outward by the reverse flow of blood, thereby closing the plurality of discrete flow areas.
1. A prosthetic valve comprising:
an annular frame having an inflow end, an outflow end, and a longitudinal axis extending from the inflow end to the outflow end, wherein the annular frame is configured to be collapsed to a radially collapsed state for mounting on a delivery apparatus and expanded to a radially expanded state inside a patient's body; and
a valve member mounted within the annular frame comprising a plurality of at least three flexible leaflets, each leaflet comprising an inflow surface, an outflow surface, an inflow edge, and an articulating outflow edge, wherein adjacent leaflets are affixed to one another along their respective inflow edges,
wherein when the prosthetic valve is deployed within the patient's body:
the forward flow of blood through the prosthetic valve causes the leaflets to collapse radially inward to a collapsed state, defining an open configuration of the prosthetic valve, thereby creating a plurality of discrete flow areas between the frame and the inflow edges of the leaflets and a centrally located pocket facing the outflow end, wherein the pocket is defined by non-contacting portions of the outflow edges of the leaflets at a center of the valve member; and
the reverse flow of blood enters the pocket and causes the leaflets to be pushed radially outward, defining a closed configuration of the prosthetic valve, thereby closing the plurality of discrete flow areas.
2. The prosthetic valve of 1 , wherein each of the inflow edges extend between two points spaced circumferentially apart along an interior circumference of the frame, wherein the inflow edges of the adjacent leaflets are joined together directly without the aid of a mechanical support member extending between the points.
3. The prosthetic valve of claim 1 , wherein, in the open configuration, the inflow edges of the leaflets form a three-pointed star arrangement as seen viewed along the longitudinal axis from the inflow end to the outflow end.
4. The prosthetic valve of claim 1 , wherein, in the closed configuration, the outflow edges are in contact with the frame and/or a skirt lining an interior surface of the frame.
5. The prosthetic valve of claim 1 , wherein in the closed configuration, the outflow surfaces face the outflow end, and the inflow surfaces face the inflow end.
6. The prosthetic valve of claim 1 , wherein the prosthetic valve is configured to be deployed within the patient's heart.
7. The prosthetic valve of claim 1 , further comprising a skirt lining an interior surface of the annular frame.
8. The prosthetic valve of claim 1 , wherein an outer surface of the prosthetic valve is configured to seal against surrounding tissue to prevent blood from flowing between the inflow end and the outflow end along the outer surface of the prosthetic valve when the prosthetic valve is deployed within the patient's body.
9. The prosthetic valve of claim 1 , further comprising an outer skirt secured around an outside of the annular frame.
10. The prosthetic valve of claim 1 , further comprising a reinforcing fabric layer wrapped around joined portions of the inflow edges and sutures passing through the fabric layer and the inflow edges.
11. A prosthetic valve comprising:
an annular frame having an inflow end, an outflow end, and a longitudinal axis extending from the inflow end to the outflow end, wherein the annular frame is configured to be collapsed to a radially collapsed state for mounting on a delivery apparatus and expanded to a radially expanded state inside a patient's body; and
a valve member mounted within the annular frame and comprising a plurality of at least three flexible leaflets, wherein each leaflet comprises a straight inflow edge and an articulating outflow edge that has a convex curved shape projecting in a downstream direction extending away from the inflow edge and toward the outflow end of the frame;
wherein when the prosthetic valve is deployed within the patient's body:
the forward flow of blood through the prosthetic valve causes the leaflets to collapse radially inward to a collapsed state, defining an open configuration of the prosthetic valve, thereby creating a plurality of discrete flow areas between the frame and the inflow edges of the leaflets; and
the reverse flow of blood causes the leaflets to be pushed radially outward, defining a closed configuration of the prosthetic valve, thereby closing the plurality of discrete flow areas.
12. The prosthetic valve of claim 11 , wherein each leaflet comprises two tabs disposed at opposite ends of the inflow edge, wherein adjacent tabs of adjacent leaflets are secured to each other to form commissures of the leaflets and wherein the outflow edge extends from adjacent commissures in the downstream direction.
13. The prosthetic valve of claim 11 , further wherein:
each of the inflow edges extend between two points spaced circumferentially apart along an interior circumference of the frame; and
wherein the inflow edges of adjacent leaflets are joined together directly without the aid of a mechanical support member extending between the points.
14. The prosthetic valve of claim 11 , wherein the inflow edges lie in a plane perpendicular to the longitudinal axis.
15. The prosthetic valve of claim 11 , wherein the inflow edge of each leaflet has portions affixed to portions of the inflow edges of two other leaflets.
16. The prosthetic valve of claim 11 , further comprising sutures joining adjacent portions of the inflow edges of adjacent leaflets to each other.
17. A prosthetic valve comprising:
an annular frame having an inflow end, an outflow end, and a longitudinal axis extending from the inflow end to the outflow end, wherein the annular frame is configured to be collapsed to a radially collapsed state for mounting on a delivery apparatus and expanded to a radially expanded state inside a patient's body;
a valve member mounted within the annular frame and comprising a plurality of at least three flexible leaflets, wherein each leaflet comprises an inflow edge and an articulating outflow edge; and
a reinforcing layer wrapped around joined portions of the inflow edges and sutures passing through the reinforcing layer and the inflow edges to secure the inflow edges of the leaflets to each other;
wherein when the prosthetic valve is deployed within the patient's body:
the forward flow of blood through the prosthetic valve causes the leaflets to collapse radially inward to a collapsed state, defining an open configuration of the prosthetic valve, thereby creating a plurality of discrete flow areas between the frame and the inflow edges of the leaflets; and
the reverse flow of blood causes the leaflets to be pushed radially outward, defining a closed configuration of the prosthetic valve, thereby closing the plurality of discrete flow areas.
18. The prosthetic valve of claim 17 , wherein each leaflet comprises two tabs disposed at opposite ends of the inflow edge, wherein adjacent tabs of adjacent leaflets are secured to each other to form commissures of the leaflets.
19. The prosthetic valve of claim 18 , further comprising sutures joining the commissures to at least one of the annular frame and an inner skirt secured to an inner surface of the frame.
20. The prosthetic valve of claim 19 , wherein the outflow edge of each leaflet comprises a convex curve extending from one commissure to an adjacent commissure.