Prosthetic cardiac valve devices, systems, and methods
A heart valve prosthesis for replacing a diseased native valve in a patient, the valve includes a compressible and expandable frame structure and an anchor connected to an outer periphery of the frame structure. The anchor comprises a free end and has a flat spiral shape. The valve may further include a valve segment mounted within the frame structure and expanded with the frame structure. The frame structure may be configured for receiving a valve segment.
1. A system for treating a diseased native valve in a patient, the system comprising:
a frame structure having an unexpanded configuration and an expanded configuration; and
an anchor comprising a free end and having a flat spiral shape, wherein the flat spiral shape comprises more than one loop positioned within a single plane that is perpendicular to a central longitudinal axis of the anchor;
wherein the frame structure is configured to be actuated from the unexpanded configuration to the expanded configuration within the anchor and adjacent a native valve in a patient, and
wherein the flat spiral is configured to circumscribe chordae of the native valve to anchor the frame structure to the native valve.
2. The system of claim 1 , wherein the anchor is configured to be fully advanced from an atrial side of the native valve into a ventricle of the heart.
3. The system of claim 2 , wherein at least a portion of the anchor is configured to reside within a subvalvular plane of the heart when it anchors the frame structure to the native valve.
4. The system of claim 3 , wherein the anchor is configured to reside entirely within the subvalvular plane of the heart when it anchors the frame structure to the native valve.
5. The system of claim 1 , wherein the anchor comprises a delivery configuration and a deployed configuration.
6. The system of claim 5 , wherein the anchor comprises the flat spiral shape in the deployed configuration.
7. The system of claim 5 , wherein the anchor comprises an elongated shape in the delivery configuration.
8. The system of claim 5 , wherein the anchor is configured to be actuated from the delivery configuration to the deployed configuration adjacent to the native valve.
9. The system of claim 8 , wherein the anchor comprises one or more locking mechanisms configured to maintain the anchor in the deployed configuration.
10. The system of claim 9 , wherein the one or more locking mechanisms comprise a frictional band, a polymer coating, or one or more key and one or more key hole features.
11. The system of claim 9 , wherein the one or more locking mechanisms comprise a first feature disposed on a first loop of the anchor and a correspondingly-shaped second feature disposed on a second loop of the anchor, the first and second features configured to nest with one another when the anchor is in the deployed configuration.
12. The system of claim 1 , wherein the more than one loop extends through about 540 degrees of rotation.
13. The system of claim 1 , wherein the more than one loop spirals radially outward from a central point.
14. The system of claim 1 , wherein the anchor comprises a super-elastic material.
15. The system of claim 14 , wherein the anchor comprises nitinol.
16. The system of claim 1 , wherein the frame structure comprises an expandable stent.
17. The system of claim 1 , wherein the free end comprises an atraumatic tip.
18. The system of claim 17 , wherein the free end comprises a ball tip.
19. The system of claim 1 , wherein the free end is configured for piercing tissue.
20. The system of claim 1 , wherein the free end is bent distally.
21. The system of claim 1 , wherein the anchor comprises a wire.
22. The system of claim 1 , wherein the anchor comprises a band.
23. The system of claim 1 , wherein the anchor comprises at least one channel or lumen disposed therein.
24. The system of claim 1 , wherein the anchor comprises a tapered band.
25. The system of claim 24 , wherein the tapered band comprises a support structure and a semi-permeable material or impermeable material disposed therein.
26. The system of claim 25 , wherein the semi-permeable material or impermeable material comprises a webbing material, a fabric, a polymeric material, or an elastomeric material.
27. The system of claim 1 , wherein the unexpanded configuration is sized and dimensioned for percutaneous insertion and the expanded configuration is sized and dimensioned for implantation in the native valve of the patient.
28. The system of claim 1 , wherein the frame structure comprises a first and second opposite ends, the first end extending above a native valve and the second end extending below the native valve when the frame structure is anchored to the native valve.
29. The system of claim 1 , further comprising a valve segment within the frame structure comprising a biocompatible one-way valve.
30. The system of claim 29 , wherein at least a portion of the valve segment is positioned within at least a portion of the frame structure.
31. The system of claim 29 , wherein the valve segment comprises at least one leaflet having an inner layer and an outer layer, and wherein the frame structure is attached to the outer layer at one or more ends of the frame structure.
32. The system of claim 29 , wherein the valve segment comprises a plurality of leaflets.