C-shaped heart valve prostheses
A prosthesis for a heart valve (e.g., the mitral valve) is generally C-shaped in plan view. Points at the top and bottom of the C lie in a plan view plane. The back of the C rises above the plan view plane between the top and bottom points. Free end portions of the C may also rise above the plan view plane. The prosthesis is accordingly saddle-shaped. The back of the C may have an indentation that extends toward the open side of the C. In use as a mitral valve prosthesis the top and bottom of the C are respectively adjacent the commissures of the valve, and the back of the C is adjacent the posterior section of the valve. The prosthesis may be rigid or semi-rigid.
1 . A heart valve prosthesis comprising:
a structure, which in plan view is generally C-shaped, a medial upper point of the C and a medial lower point of the C lying in a plan view plane, a back of the C joining the upper and lower points and being deflected upwardly out of the plan view plane between the upper and lower points, and free end portions of the C away from the back beyond the upper and lower points also being deflected upwardly out of the plan view plane.
2 . The prosthesis defined in claim 1 wherein the upper and lower points are endpoints of a greatest height of the C.
3 . The prosthesis defined in claim 2 wherein the prosthesis is substantially symmetrical about a plane perpendicular to a line passing through the upper and lower points.
4 . The prosthesis defined in claim 2 wherein the back has a maximum upward deflection out of the plan view plane that is in a range from about 5% to about 25% of the greatest height of the C.
5 . The prosthesis defined in claim 2 wherein the back has a maximum upward deflection out of the plan view plane that is in a range from about 3 mm to about 8 mm.
6 . The prosthesis defined in claim 1 wherein a central portion of the back is deflected toward an open side of the C.
7 . The prosthesis defined in claim wherein the structure is substantially rigid.
8 . The prosthesis defined in claim 1 wherein the structure is semi-rigid.