Valve component, frame component and prosthetic valve device including the same for implantation in a body lumen
Described herein is a prosthetic valve device having an optimized valve component for durability and functionality of the collapsible leaflets. Specially designed commissures contribute to the optimization along with identified parameters. In other embodiments, the invention is a frame formed from a unique cutting pattern.
1. A method of forming a prosthetic valve device for implantation into a body lumen comprising:
a) forming an annular sleeve;
b) affixing an annular belt to the annular sleeve, the annular belt having a bottom edge;
c) providing a frame having a tubular body;
d) anchoring the annular sleeve and the annular belt within the tubular body of the frame; and
e) folding the annular sleeve inward upon itself along the bottom edge of the annular belt so as to form an annular inner wall and an annular cuff that is concentric to and surrounds the annular inner wall, the annular inner wall forming a fluid passageway along an axis from an inlet edge to an outlet edge, the bottom edge of the annular belt adjacent to a bight portion of the annular sleeve that forms the inlet edge.
2. The method according to claim 1 , further comprising:
forming a plurality of commissures in a spaced-apart arrangement about a circumference of the outlet edge; and
f) anchoring the commissures to the tubular body of the frame.
3. The method according to claim 2 , wherein the plurality of commissures are formed prior to step e).
4. The method according to claim 2 , wherein each of the commissures is formed by affixing a commissure strip to the annular sleeve to cinch a portion of the annular inner wall between opposing legs of the commissure strip.
5. The method according to claim 4 , wherein for each commissure, a cusp portion of the annular inner wall protrudes radially outward from the commissure strip.
6. The method according to claim 5 , wherein for each commissure, step f) comprises anchoring the cusp portion to the tubular body of the frame.
7. The method according to claim 5 , wherein for each commissure, the cusp portion is located radially inward of the tubular body of the frame.
8. The method according to claim 2 , wherein step c) comprises forming the tubular body by cutting a pattern of slits into a tube of shape memory material having a first inner diameter, and expanding the tube of shape memory material to a tube having a second inner diameter that is greater than the first inner diameter.
9. The method according to claim 8 , wherein step c) further comprises generating a 2-D rendering of the pattern of slits and applying the 2-D rendering to the tube of shape memory material having a first inner diameter, and laser cutting the slits.
10. The method according to claim 8 , wherein the pattern of slits on the tube of shape memory material having a first inner diameter are configured so that when the tube of shape memory material is expanded to a tube having a second inner diameter, the tubular body comprises a post structure for each commissure of the valve component and a lattice structure extending between each of the post structures.
11. The method according to claim 10 , wherein step f) comprises anchoring the commissures of the valve component to the post structures of the tubular body.
12. The method according to claim 8 , wherein the pattern of slits is formed entirely of linear slits.
13. The method according to claim 12 , wherein each of the lattice structures comprise a plurality of open cells, and wherein all of the open cells of all of the lattice structures are a diamond-shape or a partial diamond-shape.
14. The method of claim 13 , wherein the diameter of the annular sleeve and is greater than the second inner diameter of the tubular body of the frame.
15. The method of claim 14 , wherein the ratio of the diameter of the annular sleeve to the second inner diameter of the tubular body is such that when the prosthetic valve device is delivered to the implantation site and the tubular body of the frame is compressed, the annular sleeve seals the plurality of open cells of the frame to prevents leakage of bodily fluid.
16. The method according to claim 2 , wherein the annular inner wall is free of anchoring penetrations with the exception of at the commissures.
17. The method according to claim 1 , wherein the annular sleeve and the annular belt are formed of a pliable material.
18. The method according to claim 1 , wherein the annular sleeve and the annular belt are formed of a material selected from the group consisting of a biological tissue and a biocompatible polymer.
19. The method according to claim 1 , wherein the frame extends along the axis from a bottom edge to a top edge, the inlet edge located at an axial location between the top and bottom edges of the tubular body of the frame.
20. The method according to claim 1 , wherein step a) comprises rolling a single sheet of material to form the annular sleeve having a single axial seam.