Expandable valve prosthesis with sealing mechanism
View Patent ↗A prosthetic heart valve includes at least one sealing member. The sealing member is adapted to conform to any surface irregularities found on the inner surface of the valve annulus, including any calcium deposits formed on the valve leaflets. The sealing member can be self-expanding or non-expanding. When deployed, the sealing member is adapted to create a blood tight seal between the prosthetic heart valve and the inner surface of the valve annulus thereby minimizing and/or eliminating perivalvular leakage at the implantation site.
1. An expandable heart valve prosthesis comprising:
an anchoring structure configured to support and fix the valve prosthesis at an implantation position, the implantation position having an annulus, a Valsalva sinus, and an aortic tunica intima, the anchoring structure including a generally cylindrical portion having a principal axis and adapted to engage an annulus at the implantation position, wherein the generally cylindrical portion includes an outflow portion adapted to engage the vessel wall at a location distal to the Valsalva sinus, an inflow portion that is tapered and sized and shaped to be positioned within and secured adjacent the annulus, and connecting members extending between the outflow portion and the inflow portion and angularly spaced from one another about the principal axis, and;
a plurality of leaflets connected to the anchoring structure and configured to regulate blood flow; and
at least one sealing member coupled to the inflow portion, the sealing member sized and dimensioned to provide a seal between the annulus and the prosthesis to prevent paravalvular leakage;
wherein the at least one sealing member comprises a lower skirt adapted to be located below the annulus, an upper skirt having a free end and adapted to be located above the annulus, and a hinge that comprises a suture coupling the upper skirt to the anchoring structure, wherein the suture constitutes the hinge, such that the blood flow may push the free end of the upper skirt down against the annulus, wherein the lower and upper skirts are configured to minimize paravalvular leakage.
2. The prosthesis of claim 1 , wherein the sealing member is selected from the group consisting of a viscoelastic material and pericardium.
3. The prosthesis of claim 1 , wherein the sealing member comprises silicone rubber or latex rubber.
4. The prosthesis of claim 1 , wherein the expandable valve prosthesis is selected from the group consisting of a self-expanding heart valve prosthesis and a balloon expandable heart valve prosthesis.
5. The prosthesis of claim 1 , wherein the sealing member does not need to expand in volume to provide the seal.
6. The prosthesis of claim 1 , wherein the sealing member decreases in volume upon expansion of the prosthesis, from an undeployed state to a deployed state.
7. The prosthesis of claim 1 , wherein the sealing member comprises a gel.
8. The prosthesis of claim 1 , wherein the seal formed between the prosthesis and the inner surface of the valve annulus is an annular seal.
9. The prosthesis of claim 1 , wherein the inflow portion is formed of a material capable of exerting a sufficient radial force to maintain a steady state, expanded orifice in relation to ballooned, calcified, native valve leaflets.
10. An expandable heart valve prosthesis comprising:
an anchoring structure configured to support and fix the valve prosthesis at an implantation position, the implantation position having an annulus, a Valsalva sinus, and an aortic tunica intima, the anchoring structure including a generally cylindrical portion having a principal axis and adapted to engage an annulus at the implantation position, wherein the generally cylindrical portion includes an outflow portion adapted to engage the vessel wall at a location distal to the Valsalva sinus, an inflow portion that is tapered and sized and shaped to be positioned within and secured adjacent the annulus, and connecting members extending between the outflow portion and the inflow portion and angularly spaced from one another about the principal axis;
a plurality of leaflets connected to the anchoring structure and configured to regulate blood flow; and
at least one sealing member coupled to the inflow portion, the sealing member sized and dimensioned to provide a seal between the annulus and the prosthesis to prevent paravalvular leakage;
wherein the at least one sealing member comprises a lower skirt adapted to be located below the annulus and longitudinally extend further into a ventricle below the annulus and configured to minimize paravalvular leakage, an upper skirt having a free end and adapted to be located above the annulus, and a hinge coupling the upper skirt to the anchoring structure such that the free end of the upper skirt is free to be moved by blood flow and may be pushed down against the annulus by the blood flow in order to minimize paravalvular leakage.
11. The prosthesis of claim 10 , wherein the hinge comprises a suture coupling the upper skirt to the anchoring structure.
12. The prosthesis of claim 10 , wherein the sealing member is selected from the group consisting of a viscoelastic material and pericardium.
13. The prosthesis of claim 10 , wherein the sealing member comprises silicone rubber or latex rubber.
14. The prosthesis of claim 10 , wherein the expandable valve prosthesis is selected from the group consisting of a self-expanding heart valve prosthesis and a balloon expandable heart valve prosthesis.
15. The prosthesis of claim 10 , wherein the sealing member does not need to expand in volume to provide the seal.
16. The prosthesis of claim 10 , wherein the sealing member decreases in volume upon expansion of the prosthesis, from an undeployed state to a deployed state.
17. The prosthesis of claim 10 , wherein the sealing member comprises a gel.
18. The prosthesis of claim 10 , wherein the seal formed between the prosthesis and the inner surface of the valve annulus is an annular seal.
19. An expandable heart valve prosthesis comprising:
an anchoring structure configured to support and fix the valve prosthesis at an implantation position, the implantation position having an annulus, a Valsalva sinus, and an aortic tunica intima, the anchoring structure including a generally cylindrical portion having a principal axis and adapted to engage an annulus at the implantation position, wherein the generally cylindrical portion includes an outflow portion adapted to engage the vessel wall at a location distal to the Valsalva sinus, an inflow portion that is tapered and sized and shaped to be positioned within and secured adjacent the annulus, and connecting members extending between the outflow portion and the inflow portion and angularly spaced from one another about the principal axis, and;
a plurality of leaflets connected to the anchoring structure and configured to regulate blood flow; and
at least one sealing member coupled to the inflow portion, the sealing member sized and dimensioned to provide a seal between the annulus and the prosthesis to prevent paravalvular leakage, wherein the entirety of the at least one sealing member includes pericardium; and
wherein the at least one sealing member comprises a lower skirt adapted to be located below the annulus, an upper skirt having a free end and adapted to be located above the annulus, and a hinge coupling the upper skirt to the anchoring structure such that the blood flow may push the free end of the upper skirt down against the annulus, wherein the lower and upper skirts are configured to minimize paravalvular leakage.