Prosthetic heart valve
A prosthetic valve is provided that includes a tubular valve body and a plurality of prosthetic leaflets disposed within a lumen of the valve body. The valve body includes struts arranged in a cellular structure defined by first and second circumferential rows of four-sided closed cells. Each of the four-sided closed cells is defined by some of the struts, which are shaped so as to collectively define the following four sides: a left upstream side, a right upstream side, a left downstream side, and a right downstream side. The struts are joined at four corners of the four-side closed cell. Each of the four sides of each of the four-sided closed cells is double-strutted. Other embodiments are also described.
1. A prosthetic valve comprising:
a valve body, which (a) is tubular, (b) has an upstream end, a downstream end, and a central longitudinal axis, and (c) defines a lumen along the central longitudinal axis; and
a plurality of prosthetic leaflets, disposed within the lumen, and configured to facilitate one-way movement of fluid through the lumen in an upstream-to-downstream direction,
wherein the valve body comprises struts arranged in a cellular structure defined by first and second circumferential rows of four-sided closed cells,
wherein each of the four-sided closed cells of the first and the second circumferential rows is defined by some of the struts, which are shaped so as to collectively define the following four sides: a left upstream side, a right upstream side, a left downstream side, and a right downstream side, the struts joined at four corners of the four-side closed cell as follows:
the left upstream side is joined to (a) the right upstream side at an upstream corner of the four-sided closed cell and (b) the left downstream side at a left corner of the four-sided closed cell, and
the right downstream side is joined to (a) the left downstream side at a downstream corner of the four-sided closed cell and (b) the right upstream side at a right corner of the four-sided closed cell, and wherein each of the four sides of each of the four-sided closed cells is double-strutted.
2. The prosthetic valve according to claim 1 , wherein, for each of the four-sided closed cells of the first and the second circumferential rows:
the double-strutted left upstream side comprises inner and outer left-upstream-side struts that run generally parallel to each other with a left upstream gap therebetween,
the double-strutted left downstream side comprises inner and outer left-downstream-side struts that run generally parallel to each other with a left downstream gap therebetween,
the inner left-upstream-side struts, the outer left-upstream-side struts, the inner left-downstream-side struts, and the outer left-downstream-side struts are joined at a left junction at the left corner,
the double-strutted right upstream side comprises inner and outer right-upstream-side struts that run generally parallel to each other with a right upstream gap therebetween,
the double-strutted right downstream side comprises inner and outer right-downstream-side struts that run generally parallel to each other with a right downstream gap therebetween, and
the inner right-upstream-side struts, the outer right-upstream-side struts, the inner right-downstream-side struts, and the outer right-downstream-side struts are joined at a right junction at the right corner.
3. The prosthetic valve according to claim 1 , wherein, for a portion of the four-sided closed cells:
the double-strutted left upstream side comprises inner and outer left-upstream-side struts that run generally parallel to each other with a left gap therebetween,
the double-strutted right upstream side comprises inner and outer right-upstream-side struts that run generally parallel to each other with a right gap therebetween,
the inner left-upstream-side strut and the inner right-upstream-side strut are joined at an inner upstream junction,
the outer left-upstream-side strut and the outer right-upstream-side strut are joined at an outer upstream junction, and
the inner upstream junction and the outer upstream junction define an upstream junction gap therebetween.
4. The prosthetic valve according to claim 1 , wherein, for each of the four-sided closed cells of at least one of the first and the second circumferential rows:
the double-strutted left downstream side comprises inner and outer left-downstream-side struts that run generally parallel to each other with a left gap therebetween,
the double-strutted right downstream side comprises inner and outer right-downstream-side struts that run generally parallel to each other with a right gap therebetween,
the inner left-downstream-side strut and the inner right-downstream-side strut are joined at an inner downstream junction,
the outer left-downstream-side strut and the outer right-downstream-side strut are joined at an outer downstream junction, and
the inner downstream junction and the outer downstream junction define a downstream junction gap therebetween.
5. The prosthetic valve according to claim 4 , wherein, for each of the four-sided closed cells of the first and the second circumferential rows:
the inner and the outer left-downstream-side struts are joined at a left junction at the left corner, and
the inner and the outer right-downstream-side struts are joined at a right junction at the right corner.
6. The prosthetic valve according to claim 1 , wherein, for each of a portion of the four-sided closed cells:
the double-strutted left downstream side comprises inner and outer left-downstream-side struts that run generally parallel to each other with a left gap therebetween,
the double-strutted right downstream side comprises inner and outer right-downstream-side struts that run generally parallel to each other with a right gap therebetween,
the inner left-downstream-side strut and the inner right-downstream-side strut are joined at an inner downstream junction,
the outer left-downstream-side strut and the outer right-downstream-side strut are joined at an outer downstream junction,
the inner downstream junction and the outer downstream junction define a downstream junction gap therebetween,
the double-strutted left upstream side comprises inner and outer left-upstream-side struts that run generally parallel to each other with a left gap therebetween,
the double-strutted right upstream side comprises inner and outer right-upstream-side struts that run generally parallel to each other with a right gap therebetween,
the inner left-upstream-side strut and the inner right-upstream-side strut are joined at an inner upstream junction,
the outer left-upstream-side strut and the outer right-upstream-side strut are joined at an outer upstream junction, and
the inner upstream junction and the outer upstream junction define an upstream junction gap therebetween.
7. The prosthetic valve according to claim 1 , wherein, for a portion of the four-sided closed cells:
the double-strutted left upstream side comprises inner and outer left-upstream-side struts that run generally parallel to each other with a left gap therebetween,
the double-strutted right upstream side comprises inner and outer right-upstream-side struts that run generally parallel to each other with a right gap therebetween,
the inner left-upstream-side strut, the outer left-upstream-side strut, the inner right-upstream-side strut, and the outer right-upstream-side strut are joined at an upstream junction.
8. The prosthetic valve according to claim 7 , wherein, for the portion of the four-sided closed cells:
the double-strutted left downstream side comprises inner and outer left-downstream-side struts that run generally parallel to each other with a left gap therebetween,
the double-strutted right downstream side comprises inner and outer right-downstream-side struts that run generally parallel to each other with a right gap therebetween,
the inner left-downstream-side strut and the inner right-downstream-side strut are joined at an inner downstream junction,
the outer left-downstream-side strut and the outer right-downstream-side strut are joined at an outer downstream junction, and
the inner downstream junction and the outer downstream junction define a downstream junction gap therebetween.
9. The prosthetic valve according to claim 1 , wherein the right corners of the four-sided closed cells of at least one of the first and the second circumferential rows are connected at respective junctions to the left corners of circumferentially-adjacent four-sided closed cells in the circumferential row.
10. The prosthetic valve according to claim 9 , wherein the junctions are shaped so as to define respective central openings therethrough.
11. The prosthetic valve according to claim 1 , wherein the struts in the cellular structure are curved.
12. The prosthetic valve according to claim 1 , wherein the upstream and the downstream corners of each of the four-sided closed cells are rounded.
13. The prosthetic valve according to claim 1 , wherein the left and the right corners each of the four-sided closed cells are rounded.
14. The prosthetic valve according to claim 1 , wherein the left downstream side and the right downstream side of each of the four-sided closed cells of the first circumferential row also define the right upstream side and the left upstream side, respectively, of two circumferentially-adjacent four-sided closed cells of the second circumferential row, respectively.
15. The prosthetic valve according to claim 1 , wherein all the cells of the cellular structure of the valve body are either four-sided closed cells of the first circumferential row or four-sided closed cells of the second circumferential row.
16. The prosthetic valve according to claim 1 , wherein the first and the second circumferential rows are disposed at opposing ends of the valve body.
17. The prosthetic valve according to claim 1 , wherein the prosthetic valve comprises a frame assembly that comprises (i) an inner frame that defines the valve body, and (ii) an outer frame that circumscribes the valve body, and is coupled to the inner frame by being fixed to a plurality of junctions between circumferentially-adjacent four-sided closed cells.
18. The prosthetic valve according to claim 1 , further comprising a plurality of arms, which extend radially outward from the valve body when the prosthetic valve is in an expanded state.
19. The prosthetic valve according to claim 1 , further comprising a plurality of arms, which are shaped so as to define (a) respective first ends joined to the valve body and (b) respective second free ends,
wherein, when the prosthetic valve is in an expanded state, the second free ends are disposed at a greater distance from a central longitudinal axis than the respective first ends.
20. The prosthetic valve according to claim 19 , wherein the first ends of the arms are joined to the valve body at respective corners of the four-sided closed cells.
21. The prosthetic valve according to claim 19 , wherein each of the arms is joined to a junction between the right corner of one of the four-sided closed cells and the left corner of a circumferentially-adjacent second one of the four-sided closed cells in the circumferential row.
22. The prosthetic valve according to claim 19 , wherein the second free ends are disposed at different longitudinal sites from the respective first ends when the prosthetic valve is in the expanded state.
23. The prosthetic valve according to claim 1 , comprising a frame that defines the valve body, wherein the frame is made by cutting from a tube, such that the valve body is monolithic.