Percutaneous valve prosthesis and system and method for implanting the same
A method for delivering a heart valve prosthesis to a native valve annulus comprises expanding an expandable frame at the native valve annulus and positioning a replacement heart valve within the expandable frame. The expandable frame preferably includes a first anchoring portion that is positioned on a first side of the native valve annulus and a second anchoring portion that is positioned on a second side of the native valve annulus. The first anchoring portion engages tissue on the first side of the native valve annulus and the second anchoring portion engages tissue on the second side of the native valve annulus for securing the expandable frame to the native valve annulus. The replacement heart valve comprises a plurality of leaflets for replacing the function of the native valve.
1. A method for delivering a heart valve prosthesis to a native valve annulus, comprising:
delivering a self-expanding valve cage stent to the native valve annulus, the valve cage stent including opposing anchoring portions for engaging surrounding tissue and having a plurality of guide wires connected thereto and circumferentially spaced around a periphery thereof;
expanding the valve cage stent within the native valve annulus;
engaging tissue of the native valve annulus with the opposing anchoring portions, wherein the opposing anchoring portions extend radially outwardly from a longitudinal axis of the valve cage stent;
positioning at least a portion of a tissue valve within the valve cage stent, the tissue valve comprising an expandable and compressible valve frame made from a memory metal, wherein proper positioning of the tissue valve with respect to the valve cage stent is ensured by guiding the tissue valve over the guide wires;
once the tissue valve is positioned, removing the guide wires from the body; and
expanding the tissue valve and coupling the tissue valve to the valve cage stent;
wherein the valve cage stent is implanted by use of a first catheter to provide a stable support structure and wherein the tissue valve is implanted within the valve cage stent by use of a second catheter.
2. The method of claim 1 , wherein the valve cage stent comprises a tubular structure formed by a plurality of struts.
3. The method of claim 1 , wherein the tissue valve comprises three commissure posts.
4. The method of claim 3 , wherein the valve cage stent comprises three commissure pins along an outlet portion, the commissure pins shaped for connecting to the commissure posts of the tissue valve.
5. The method of claim 4 , wherein the commissure posts are cannulated for receiving the commissure pins.
6. The method of claim 1 , wherein the tissue valve further comprises a tissue cover.
7. The method of claim 1 , wherein the tissue valve further comprises a fabric cover to provide additional support and minimize leaking.
8. The method of claim 1 , wherein the valve cage stent is substantially cylindrical.
9. The method of claim 1 , wherein the valve cage stent is formed by cutting a tube with a laser.
10. The method of claim 1 , wherein the valve cage stent further comprises fabric along at least a portion of an interior surface and an exterior surface.
11. The method of claim 1 , wherein the first catheter includes a flexible outer sheath for restraining the valve cage stent.
12. The method of claim 1 , wherein the tissue valve is a tri-leaflet tissue valve.
13. The method of claim 1 , wherein the heart valve prosthesis is an aortic valve prosthesis.
14. The method of claim 1 , wherein the tissue valve is coupled to a superior rim of the valve cage stent.
15. A method for delivering a heart valve prosthesis to a native valve annulus, comprising:
delivering a self-expanding valve cage stent to the native valve annulus, the valve cage stent including opposing anchoring portions for engaging surrounding tissue, the valve cage stent further comprising three commissure pins along an outlet portion;
expanding the valve cage stent within the native valve annulus;
engaging tissue of the native valve annulus with the opposing anchoring portions, wherein the opposing anchoring portions extend radially outwardly from a longitudinal axis of the valve cage stent;
positioning at least a portion of a tissue valve within the valve cage stent, the tissue valve comprising an expandable and compressible valve frame made from a memory metal, wherein the tissue valve comprises three commissure posts; and
expanding the tissue valve and coupling the tissue valve to the valve cage stent, wherein the commissure pins of the valve cage stent are shaped for connecting to the commissure posts of the tissue valve;
wherein the valve cage stent is implanted by use of a first catheter to provide a stable support structure and wherein the tissue valve is implanted within the valve cage stent by use of a second catheter.
16. The method of claim 15 , wherein the commissure posts are cannulated for receiving the commissure pins.
17. The method of claim 15 , wherein the tissue valve further comprises a fabric cover to provide additional support and minimize leaking.
18. The method of claim 17 , wherein the tissue valve is a tri-leaflet tissue valve.
19. The method of claim 17 , wherein the valve cage stent further comprises fabric along at least a portion of an interior surface and an exterior surface.