Percutaneously-deliverable mechanical valve
View Patent ↗Apparatus for regulating blood flow of a subject is provided, the apparatus comprising a prosthetic valve ( 20 ) that comprises a tubular element ( 22 ), shaped to define a lumen ( 23 ) therethrough, and a valve member ( 24 ), configured to be coupled to the tubular element ( 22 ) and to be disposed within the lumen ( 23 ). The prosthetic valve ( 20 ) has (1) a compressed configuration in which the lumen ( 23 ) has a compressed width, the valve member ( 24 ) is generally cylindrical, and the prosthetic valve ( 20 ) is configured to be percutaneously delivered into the subject, and (2) an expanded configuration in which the lumen ( 23 ) has an expanded width that is greater than the compressed width, and the valve member ( 24 ) is generally disc-shaped, is coupled to the tubular element ( 22 ), and is disposed within the lumen ( 23 ). Other embodiments are also described.
1. Apparatus for regulating blood flow of a subject, the apparatus comprising a prosthetic valve, the prosthetic valve comprising:
a first frame:
defining an arrangement of cells that shape the first frame as a tubular element having a first end and a second end;
having a compressed state in which the first frame is generally cylindrical, has a compressed width, and is transluminally deliverable into the subject, and
having an expanded state in which the first frame is generally cylindrical, has an expanded width that is greater than the compressed width, and defines a lumen between the first end and the second end; and
a second frame:
coupled to the first frame,
defining an arrangement of cells,
having a compressed state in which the valve member is transluminally deliverable into the subject, and
having an expanded state in which the second frame:
is disposed within the lumen, and
defines a valve member that provides directional fluid flow through the lumen by the second frame moving with respect to the first frame in response to changes in relative fluid pressure between the first end and the second end.
2. The apparatus according to claim 1 , wherein the valve member provides directional fluid flow through the lumen without changing shape in response to changes in relative fluid pressure between the first end and the second end.
3. The apparatus according to claim 1 , wherein:
the valve member provides directional fluid flow through the lumen by moving, in response to changes in relative fluid pressure between the first end and the second end, between (i) an open state in which the first and second ends of the lumen are in fluid communication with each other, and (ii) a closed state in which the first and second ends of the lumen are generally not in fluid communication with each other, and
the valve member is biased toward assuming the closed state.
4. The apparatus according to claim 1 , wherein:
the valve member provides directional fluid flow through the lumen by moving, in response to changes in relative fluid pressure between the first end and the second end, between (i) an open state in which the first and second ends of the lumen are in fluid communication with each other, and (ii) a closed state in which the first and second ends of the lumen are generally not in fluid communication with each other, and
the prosthetic valve is configured such that, when the valve member moves toward the open state, at least part of the valve member moves toward the first end of the lumen and at least part of the valve member moves toward the second end of the lumen.
5. The apparatus according to claim 1 , wherein the prosthetic valve further comprises a valve seat that protrudes into the lumen and facilitates sealing between the tubular element and the valve member.
6. The apparatus according to claim 5 , wherein the valve seat is annular.
7. The apparatus according to claim 5 , wherein the valve seat is a first arc-shaped valve seat, and wherein the prosthetic valve further comprises a second arc-shaped valve seat.
8. The apparatus according to claim 1 , wherein the second frame is coupled to the first frame at two coupling points.
9. The apparatus according to claim 8 , wherein the coupling points lie on a central transverse axis of the tubular element.
10. The apparatus according to claim 8 , wherein the coupling points lie on a non-central transverse axis of the tubular element.
11. The apparatus according to claim 8 , wherein the valve member provides directional fluid flow by the second frame deflecting around an axis between the two coupling points in response to changes in relative fluid pressure between the first end and the second end.
12. The apparatus according to claim 11 , further comprising a coupling rod that extends between the two coupling points, and the valve member provides directional fluid flow by the second frame bending around the coupling rod in response to changes in relative fluid pressure between the first end and the second end.
13. The apparatus according to claim 1 , wherein the valve member provides directional fluid flow by the second frame rotating around an axis between the two coupling points in response to changes in relative fluid pressure between the first end and the second end.
14. The apparatus according to claim 1 , wherein the second frame is coupled to the first frame such that when the first frame is in its compressed state and the second frame is in its compressed state, the second frame is disposed within the lumen.
15. The apparatus according to claim 1 , wherein the valve member provides directional fluid flow by the second frame bending in response to changes in relative fluid pressure between the first end and the second end.
16. The apparatus according to claim 1 , wherein the valve member provides directional fluid flow by the second frame changing shape in response to changes in relative fluid pressure between the first end and the second end.
17. The apparatus according to claim 1 , wherein the valve member is unevenly rigid.