Prosthetic heart valve with retention elements
Described embodiments are directed toward centrally-opening leaflet prosthetic valve devices having a leaflet frame and a leaflet construct. The leaflet construct is at least partially coupled to a leaflet frame outer side of the leaflet frame and being coupled thereto by a retention element.
1. A prosthetic valve, comprising:
a leaflet frame having a central axis, an inner side and an outer side, the leaflet frame including a plurality of commissure posts and a plurality of leaflet windows each located between adjacent commissure posts;
a leaf let construct including a plurality of leaflets and a bridge region between each of the leaflets, the leaflets extending inward from the leaflet frame, each of the leaflets defining a fold-over portion having a plurality of fold-over apertures, each of the fold over portions being folded over an inflow edge of the leaflet frame; and
a plurality of securement structures securing the fold-over portions of the leaflet construct to the leaflet frame using the plurality of fold-over apertures.
2. The prosthetic valve of claim 1 , wherein the leaflet frame includes a plurality of frame apertures in the leaflet window, wherein each of the plurality of fold-over apertures of each of the plurality of leaflets is aligned with one of the plurality of frame apertures, the plurality of securement structures passing through the aligned plurality of frame apertures and plurality of fold-over apertures to couple the fold-over portions to the leaflet windows of the leaflet frame.
3. The prosthetic valve of claim 1 wherein the fold-over portion of each of the leaflets is folded around an inflow edge of the leaflet frame and coupled to the leaflet frame outer side.
4. The prosthetic valve of claim 1 wherein each commissure post of the plurality of commissure posts comprises a first post leg and a second post leg that extend from one of the plurality of the leaflet windows toward a commissure tip that is associated with the respective commissure post, the first post leg and the second post leg of each commissure post being spaced from one another to define a post slot.
5. The prosthetic valve of claim 1 , wherein leaflet construct is formed as a contiguous cylinder.
6. The prosthetic valve of claim 1 , wherein the plurality of securement structures comprises a plurality of sutures.
7. The prosthetic valve of claim 1 , wherein the plurality of securement structures comprises adhesives or thermal bonds.
8. The prosthetic valve of claim 1 , wherein the leaflet construct comprises at least one fluoropolymer membrane layer.
9. The prosthetic valve of claim 8 , wherein the at least one fluoropolymer membrane layer is an expanded fluoropolymer membrane layer.
10. The prosthetic valve of claim 9 , wherein an elastomer is contained within a porous structure of the expanded fluoropolymer membrane layer, coated on one or both sides of the expanded fluoropolymer membrane layer, or a combination of coated on and contained within the expanded fluoropolymer membrane layer.