Heart valve
A heart valve includes a valve body made of a flexible material such as pericardium. The valve body is made of two layers of material, an outer layer, and an inner layer that defines a plurality of leaflets. The leaflets of the inner layer are attached to the outer layer. In some embodiments the valve body is made by cutting a single piece of flat source tissue, folding the cut tissue and forming it into a tubular pattern having the inner and outer layers. The multi-layer valve body can be mounted on a stent for delivery within a patient's heart.
1. A replacement heart valve comprising:
a radially expandable and compressible annular frame, wherein the frame comprises:
an outflow end and an inflow end;
a plurality of circumferentially extending rows of struts arranged in a zigzag pattern, including a first row of struts and a second row of struts upstream of the first row of struts;
a plurality of longitudinally extending struts extending between the first and second circumferentially extending rows of struts, wherein the longitudinally extending struts comprise ring-shaped eyelets that are located axially upstream of the first row of struts and axially downstream of the second row of struts;
a valve body disposed inside of the frame, wherein the valve body comprises a single piece of tissue defining three leaflets configured to regulate the flow of blood through the replacement heart valve in one direction; and
an outer skirt disposed around an outer surface of the frame;
wherein the frame is balloon-expandable and the replacement heart valve is configured to be delivered percutaneously to a patient's heart in a radially compressed state and radially expanded to a radially expanded state within a native annulus of the heart.
2. The replacement heart valve of claim 1 , wherein the single piece of tissue comprises pericardium.
3. The replacement heart valve of claim 1 , wherein the valve body is folded to form three commissures that are fixed relative to the frame, and the leaflets can move between open and closed states relative to the commissures.
4. The replacement heart valve of claim 3 , wherein the ring-shaped eyelets are located circumferentially between adjacent commissures.
5. The replacement heart valve of claim 4 , wherein pairs of adjacent ends of adjacent struts in the first row of struts are connected to respective ring-shaped eyelets.
6. The replacement heart valve of claim 1 , wherein the first and second rows of struts are located along an outflow end portion of the frame.
7. The replacement heart valve of claim 1 , wherein the leaflets have downstream, coaptation edges adjacent the first row of struts.
8. The replacement heart valve of claim 1 , wherein the plurality of circumferentially extending rows of struts includes a third row of struts upstream of the second row of struts, wherein the first and second row of struts define a first row of cells of the frame and the second and third row of struts define a second row of cells of the frame, wherein the cells of the first row of cells are longer in a longitudinal direction of the frame than the cells of the second row of cells.
9. The replacement heart valve of claim 1 , wherein the outer skirt comprises a fabric.
10. The replacement heart valve of claim 1 , wherein the leaflets are sewn to an inner skirt along U-shaped seams.
11. The replacement heart valve of claim 1 , wherein the single piece of tissue of the valve body is folded to form an inner layer defining the leaflets and an outer layer forming a skirt portion.
12. The replacement heart valve of claim 1 , wherein each ring-shaped eyelet has a circular outer perimeter and a circular aperture.
13. A replacement heart valve comprising:
a radially expandable and compressible annular frame, wherein the frame comprises:
an outflow end and an inflow end;
a plurality of circumferentially extending rows of struts arranged in a zigzag pattern, including a first row of struts and a second row of struts;
a plurality of longitudinally extending frame members interconnecting and extending between the first and second circumferentially extending rows of struts, wherein each longitudinally extending frame member comprises two ring-shaped eyelets that are located axially upstream of the first row of struts and axially downstream of the second row of struts; and
a valve body disposed inside of the frame, wherein the valve body comprises a unitary piece of tissue defining three leaflets and three commissures that are fixed relative to the frame, and wherein the leaflets can move between open and closed states relative to the commissures to regulate the flow of blood through the replacement heart valve in one direction;
wherein the eyelets are located circumferentially between adjacent commissures;
wherein the frame is balloon-expandable and the replacement heart valve is configured to be delivered percutaneously to a patient's heart in a radially compressed state and radially expanded to a radially expanded state within a native annulus of the heart.
14. The replacement heart valve of claim 13 , further comprising an outer skirt disposed around an outer surface of the frame.
15. The replacement heart valve of claim 13 , wherein the unitary piece of tissue comprises pericardium.
16. The replacement heart valve of claim 13 , wherein pairs of adjacent ends of adjacent struts in the first row of struts are connected to respective ring-shaped eyelets.
17. The replacement heart valve of claim 13 , wherein the leaflets have downstream, coaptation edges adjacent the first row of struts.
18. The replacement heart valve of claim 13 , wherein each ring-shaped eyelet has a circular outer perimeter and a central aperture.
19. A replacement heart valve comprising:
a radially expandable and compressible annular frame, wherein the frame comprises:
a plurality of circumferentially extending rows of struts arranged in a zigzag pattern, including a first row of struts and a second row of struts; and
a plurality of longitudinally extending frame members interconnecting and extending between the first and second circumferentially extending rows of struts, wherein the longitudinally extending frame members comprise apertures that are located axially upstream of the first row of struts and axially downstream of the second row of struts; and
a valve body disposed inside of the frame, wherein the valve body comprises a unitary piece of tissue defining three leaflets and three commissures that are fixed relative to the frame, and wherein the leaflets can move between open and closed states relative to the commissures to regulate the flow of blood through the replacement heart valve in one direction;
wherein the apertures are located circumferentially between adjacent commissures;
wherein the frame is balloon-expandable and the replacement heart valve is configured to be delivered percutaneously to a patient's heart in a radially compressed state and radially expanded to a radially expanded state within a native annulus of the heart.
20. The replacement heart valve of claim 19 , wherein the apertures are formed in ring-shaped portions of the longitudinally extending frame members.
21. The replacement heart valve of claim 20 , wherein pairs of adjacent ends of adjacent struts in the first row of struts are connected to respective ring-shaped portions.
22. The replacement heart valve of claim 19 , wherein the unitary piece of tissue comprises commissure tab portions interconnecting the leaflets.
23. The replacement heart valve of claim 19 , wherein the unitary piece of tissue of the valve body is folded to form an inner layer defining the leaflets and an outer layer forming a skirt portion.
24. The replacement heart valve of claim 23 , wherein the outer layer forming the skirt portion is disposed on the outside of the frame.