Puckering seal for reduced paravalvular leakage
View Patent ↗A heart valve assembly includes a heart valve, a self-expandable and collapsible stent, and a sealing member. The stent includes an inflow end and an outflow end and is configured to support the heart valve internally. The sealing member is connected to and extends circumferentially around the stent. The sealing member includes a plurality of radially outward extending protrusions comprising a fold of material of the sealing member.
1. A heart valve assembly, comprising:
a heart valve;
a self-expandable and collapsible stent comprising an inflow end and an outflow end and being configured to support the heart valve internally, the stent having an inner surface, and an outer surface for contacting native heart tissue; and
a sealing member disposed adjacent the inflow end of the stent and on the outer surface of the stent such that the sealing member extends circumferentially and entirely around the outer surface of the stent, the sealing member being attached to the stent at a plurality of attachment locations spaced about the stent in a circumferential direction to form a plurality of discrete protrusions comprising a fold of material of the sealing member, each of the plurality of discrete protrusions positioned between adjacent attachment locations in the circumferential direction and including a center portion that is positioned radially outward from the adjacent attachment locations, each of the center portions being compressible in a radially inward direction of the stent.
2. The heart valve assembly of claim 1 , wherein the plurality of discrete protrusions are equally spaced apart in the circumferential direction of the stent.
3. The heart valve assembly of claim 1 , wherein the plurality of discrete protrusions are circumferentially spaced about the stent in first and second rows, the first row being axially spaced apart from the second rows.
4. The heart valve assembly of claim 1 , wherein the sealing member extends between a first edge adjacent the inflow end and a second edge closer to the outflow end than the first edge, the plurality of discrete protrusions positioned at the inflow end of the stent.
5. The heart valve assembly of claim 1 , wherein the plurality of discrete protrusions are arranged in at least one row extending around the stent in the circumferential direction.
6. The heart valve assembly of claim 1 , wherein at least a portion of the sealing member is positioned on the stent at a location distal of the heart valve.
7. The heart valve assembly of claim 1 , wherein each of the discrete protrusions are disposed between two first stitchings located at the attachment locations and coupling the sealing member to the stent, and wherein each of the discrete protrusions include a second stitching coupled only to the discrete protrusion.
8. The heart valve assembly of claim 1 , wherein each of the plurality of discrete protrusions includes a plurality of stitches.
9. The heart valve assembly of claim 1 , wherein the sealing member comprises fabric.
10. The heart valve assembly of claim 1 , wherein each of the discrete protrusions coincides with a shape of a cell of the stent.
11. The heart valve assembly of claim 1 , wherein the sealing member is mounted to the outer surface of the stent.
12. The heart valve assembly of claim 1 , wherein the stent includes annular, sinus and aortic sections, and the sealing member is positioned at least partially along at least one of the annular or the sinus sections.
13. The heart valve assembly of claim 1 , wherein the sealing member is connected to the heart valve.
14. The heart valve assembly of claim 1 , wherein a central axis of the sealing member is arranged at an angle of between 10 degrees and 30 degrees relative to a longitudinal axis of the stent so that the sealing member and the stent are not coaxial.
15. A sealing member for use with a valve assembly, comprising:
a base configured and arranged to be entirely disposed radially outward of an outer surface of a self-expandable and collapsible stent, and capable of being attached about the outer surface of the stent such that the base is positioned between the outer surface of the stent and native heart tissue when the valve assembly is implanted at an implantation site; and
a plurality of discrete protrusions disposed about the base in a circumferential direction and formed at least in part by at least one stitch, each of the plurality of discrete protrusions having a center portion positioned between two attachment regions and spaced radially outward from the two attachment regions, each center portions being compressible in a radially inward direction to provide a sealed interface between the valve assembly and a native annulus at the implantation site.
16. The sealing member of claim 15 , wherein each of the plurality of discrete protrusions includes a fold in the base.
17. The sealing member of claim 15 , wherein the at least one stitch maintains a folded shape of the plurality of discrete protrusions.
18. The sealing member of claim 15 , wherein the plurality of discrete protrusions are arranged in at least one row extending around the base in the circumferential direction.