Prosthetic heart valve having improved commissure supports
A method of implanting a prosthetic heart valve within a patient can comprise inserting a distal end portion of a delivery apparatus and a prosthetic heart valve into the patient and advancing the prosthetic heart valve to a deployment location within the heart of the patient and inflating one or more of a plurality of differently-sized balloons in a balloon-assembly on the distal end portion of the delivery apparatus. The prosthetic heart valve can be mounted on the balloon assembly in a crimped state and the inflating of the one or more of the plurality of differently-sized balloons can expand the prosthetic heart valve from the crimped state to a radially expanded state having a non-cylindrical shape.
1. A prosthetic heart valve comprising:
a radially-collapsible annular frame having an inflow end, and outflow end, an inflow end row of cells that is the closest row of cells to the inflow end, and an outflow end row of cells that is the closest row of cells to the outflow end, wherein the frame comprises a plurality of struts arranged to form the cells of the inflow end row of cells and the outflow end row of cells, and selected struts of the outflow end row of cells at least partially define commissure portions of the frame, such that the commissure portions are located between the cells of the outflow end row of cells; and
a valve structure positioned within the frame and secured to the commissure portions, the valve structure configured to open to an open position during systole and close to a closed position during diastole when the prosthetic heart valve is implanted in a patient;
wherein cells of the outflow end row of cells have a greater axial length than cells of the inflow end row of cells;
wherein for each commissure portion, two struts of the outflow end row of cells extend from an outflow end of the commissure portion toward the outflow end of the frame; and
wherein the commissure portions of the frame flex radially inwardly when the valve structure closes to the closed position during diastole, such that the commissure portions are offset radially inwardly relative to circumferentially adjacent struts of the outflow end row of cells when the valve structure is in the closed position.
2. The prosthetic heart valve of claim 1 , wherein the outflow end of the frame includes axial projections that extend axially from the outflow end row of cells and are configured to form a release connection with a delivery apparatus.
3. The prosthetic heart valve of claim 1 , wherein the outflow end of the frame reduces in diameter when the commissure portions of the frame flex radially inwardly.
4. The prosthetic heart valve of claim 1 , wherein the commissure portions move closer together when the commissure portions flex radially inwardly.
5. The prosthetic heart valve of claim 1 , wherein the commissure portions comprise three commissure portions and the valve structure comprises three leaflets, each leaflet being secured to two of the three commissure portions.
6. The prosthetic heart valve of claim 1 , wherein the cells of the inflow row of cells are diamond shaped.
7. The prosthetic heart valve of claim 1 , wherein the cells of the outflow row of cells are diamond shaped.
8. The prosthetic heart valve of claim 1 , wherein the frame comprises shape-memory material.
9. The prosthetic heart valve of claim 1 , further comprising an annular inner skirt positioned inside the frame adjacent the inflow end of the frame.
10. A prosthetic heart valve comprising:
a radially-collapsible annular frame having an inflow end, and outflow end, a first row of cells at the inflow end, and a second row of cells at the outflow end, and commissure portions of the frame that share struts with the second row of cells; and
a leaflet assembly comprising a plurality of leaflets and positioned within the frame, wherein the leaflet assembly has a plurality of commissures secured to the commissure portions of the frame, wherein the leaflets are configured to open during systole and close during diastole when the prosthetic heart valve is implanted in a patient;
wherein cells of the second row of cells are axially larger than cells of the first row of cells;
wherein the commissure portions of the frame are positioned at least partially between axial ends of the second row of cells and are positioned between adjacent cells of the second row of cells; and
wherein the struts of the frame have sufficient flexibility to allow the commissure portions of the frame to flex radially inwardly when the valve structure closes during diastole, such that the commissure portions of the frame are offset radially inwardly relative to circumferentially adjacent struts of the outflow end row of cells when the valve structure is closed.
11. The prosthetic heart valve of claim 10 , wherein the cells of the second row are diamond shaped.
12. The prosthetic heart valve of claim 10 , wherein the outflow end of the frame includes axial projections that extend axially from the second row of cells and are configured to form a release connection with a delivery apparatus.
13. The prosthetic heart valve of claim 10 , wherein the outflow end of the frame reduces in diameter when the commissure portions of the frame flex radially inwardly.
14. The prosthetic heart valve of claim 10 , wherein the commissure portions move closer together when the commissure portions flex radially inwardly.
15. The prosthetic heart valve of claim 10 , further comprising an annular inner skirt positioned inside the frame adjacent the inflow end of the frame, wherein the inner skirt comprises a fabric material and has an undulating outflow edge.
16. The prosthetic heart valve of claim 10 , wherein the frame comprises Nitinol and is self-expanding.
17. The prosthetic heart valve of claim 10 , wherein each of the commissure portions of the frame is four-sided.
18. The prosthetic heart valve of claim 10 , wherein the frame comprises at least two rows of cells between the first row of cells and the second row of cells.
19. The prosthetic heart valve of claim 10 , wherein for each commissure portion of the frame, two struts of the outflow end row of cells extend from an outflow end of the commissure portion to the outflow end of the frame.