Prosthetic valve with s-shaped tissue anchors
Prosthetic valves and methods of use of prosthetic valves may be provided. In one implementation, a prosthetic valve may include an annular outer frame, an inner frame, and a plurality of ventricular anchoring legs extending from the outer frame. The outer frame may be formed at least partially of struts intersecting at junctions. At least one ventricular anchoring leg may include a first curved leg portion on a first surface of the leg, and a second curved leg portion on a second, opposite surface of the leg. The outer frame may also include a strut extending between a downstream end of the outer frame and the junction from which the at least one ventricular anchoring leg extends.
1. An expandable prosthetic valve configured for implantation within a native heart valve, the prosthetic valve comprising:
an annular outer frame formed at least partially of outer frame struts intersecting at outer frame junctions;
an inner frame situated at least partially within the annular outer frame and formed at least partially of inner frame struts intersecting at inner frame junctions; and
a plurality of ventricular anchoring legs extending from the annular outer frame, each ventricular anchoring leg comprising:
a proximal leg end secured to an outer frame junction of the annular outer frame, and
a terminal leg end opposite from the proximal leg end, wherein
at least one ventricular anchoring leg includes:
a first surface extending between the proximal leg end and terminal leg end of the at least one ventricular anchoring leg, the first surface having a first curved leg portion configured to have a convex arrangement with respect to a longitudinal axis of the prosthetic valve, and
a second surface extending between the proximal leg end and terminal leg end of the at least one ventricular anchoring leg, the second surface being situated on an opposite side of the ventricular anchoring leg from the first surface and having a second curved leg portion situated between the first curved leg portion and the terminal leg end, wherein the second curved leg portion is configured to have a concave arrangement with respect to the longitudinal axis of the prosthetic valve,
the annular outer frame includes a first outer frame strut extending between a downstream end of the annular outer frame and the outer frame junction from which the at least one ventricular anchoring leg extends, and
the first outer frame strut and at least one of the first curved leg portion and the second curved leg portion of the at least one ventricular anchoring leg are situated at the same circumferential position about the prosthetic valve as the terminal leg end of the at least one ventricular anchoring leg.
2. The prosthetic valve of claim 1 , wherein the first outer frame strut, the first curved leg portion, and the second curved leg portion of the at least one ventricular anchoring leg are situated at the same circumferential position about the prosthetic valve as the terminal leg end of the at least one ventricular anchoring leg.
3. The prosthetic valve of claim 1 , wherein the at least one ventricular anchoring leg additionally includes at least one of:
a first linear portion extending between the proximal leg end and the first curved leg portion of the at least one ventricular anchoring leg;
a second linear portion extending between the first curved leg portion and the second curved leg portion of the at least one ventricular anchoring leg; and
a third linear portion extending between the second curved leg portion and the terminal leg end of the at least one ventricular anchoring leg.
4. The prosthetic valve of claim 1 , wherein the terminal leg end of the at least one ventricular anchoring leg is configured to be situated radially outward from the second curved leg portion of the at least one ventricular anchoring leg, with respect to the longitudinal axis of the prosthetic valve.
5. The prosthetic valve of claim 1 , wherein the second curved leg portion of the at least one ventricular anchoring leg is configured to be situated upstream and radially outward from the first curved leg portion of the at least one ventricular anchoring leg.
6. The prosthetic valve of claim 1 , further comprising a plurality of atrial anchoring arms configured to extend radially outward from the inner frame, wherein each atrial anchoring arm comprises:
a proximal arm end secured to the inner frame; and
a terminal arm end opposite from the proximal arm end.
7. The prosthetic valve of claim 6 , wherein the proximal leg ends and the proximal arm ends are configured to be situated at different circumferential positions about the prosthetic valve.
8. The prosthetic valve of claim 6 , wherein when the prosthetic valve is in a radially-expanded configuration, at least one atrial anchoring arm is configured to extend radially outward beyond the terminal leg end of the at least one ventricular anchoring leg.
9. The prosthetic valve of claim 1 , wherein when the prosthetic valve is in a radially-expanded configuration, a length of the at least one ventricular anchoring leg that extends between the proximal and terminal leg ends thereof is configured to extend in an upstream direction.
10. The prosthetic valve of claim 1 , wherein
each ventricular anchoring leg has a single point of connection to the annular outer frame, and
each ventricular anchoring leg connects with the annular outer frame at a different outer frame junction.
11. The prosthetic valve of claim 1 , wherein the prosthetic valve is configured to be symmetrical, with respect to the longitudinal axis of the prosthetic valve.
12. An expandable prosthetic valve configured for implantation within a native heart valve, the prosthetic valve comprising:
a valve body including an annular outer frame and an inner frame situated at least partially within the annular outer frame;
a plurality of atrial anchoring arms configured to extend radially outward from the valve body, each atrial anchoring arm comprising:
a proximal arm end secured to one of the annular outer frame or the inner frame, and
a terminal arm end opposite from the proximal arm end; and
a plurality of ventricular anchoring legs configured to extend radially outward from the valve body, each ventricular anchoring leg comprising:
a proximal leg end secured to the other of the annular outer frame or the inner frame, and
a terminal leg end opposite from the proximal leg end, wherein
at least one ventricular anchoring leg includes:
a first surface extending between the proximal leg end and terminal leg end of the at least one ventricular anchoring leg, the first surface having a first curved leg portion situated between the proximal leg end and the terminal leg end, wherein the first curved leg portion is configured to have a convex arrangement with respect to a longitudinal axis of the prosthetic valve, and
a second surface extending between the proximal leg end and terminal leg end of the at least one ventricular anchoring leg, the second surface being situated on an opposite side of the ventricular anchoring leg from the first surface and having a second curved leg portion situated between the first curved leg portion and the terminal leg end, wherein the second curved leg portion is configured to have a concave arrangement with respect to the longitudinal axis of the prosthetic valve, and
the prosthetic valve is configured to be symmetrical, with respect to the longitudinal axis of the prosthetic valve.
13. The prosthetic valve of claim 12 , wherein the atrial anchoring arms extend from the inner frame and the ventricular anchoring legs extend from the annular outer frame.
14. The prosthetic valve of claim 12 , wherein when the prosthetic valve is in a radially-expanded configuration, the second curved leg portion of the at least one ventricular anchoring leg is configured to be situated in an upstream direction from an upstream end of the annular outer frame.
15. The prosthetic valve of claim 12 , wherein the second curved leg portion of the at least one ventricular anchoring leg is configured to be situated upstream and radially outward from the first curved leg portion of the at least one ventricular anchoring leg.
16. The prosthetic valve of claim 12 , wherein at least one atrial anchoring arm includes:
a first arm portion situated between the proximal arm end and the terminal arm end, the first arm portion being configured to extend in an upstream direction when the prosthetic valve is in a radially-expanded configuration, and
a second arm portion situated between the proximal arm end and the first arm portion, the second arm portion being configured to extend in a downstream direction when the prosthetic valve is in the radially-expanded configuration.
17. The prosthetic valve of claim 12 , wherein the second surface of the at least one ventricular anchoring leg is configured to engage ventricular tissue of the native heart valve upon implantation of the prosthetic valve.
18. The prosthetic valve of claim 12 , wherein the ventricular anchoring legs and the atrial anchoring arms alternate at a regular interval about a circumference of the valve body.
19. The prosthetic valve of claim 12 , wherein when the prosthetic valve is in a radially-expanded configuration, a portion of the at least one ventricular anchoring leg is configured to be situated at the same position along the longitudinal axis of the prosthetic valve as a portion of at least one atrial anchoring arm.
20. The prosthetic valve of claim 12 , wherein when the prosthetic valve is in a radially-expanded configuration, a length of the at least one ventricular anchoring leg that extends between the proximal and terminal leg ends thereof is configured to extend in an upstream direction.