Annuloplasty prostheses with improved anchoring structures, and related methods
An annuloplasty prosthesis is less than a complete ring (e.g., it may be C-shaped or U-shaped). The prosthesis has a structural member that basically gives the prosthesis its shape. The structural member is provided with surface portions that are transverse to adjacent portions of the surface of the structural member. At least two of these transverse surface portions are spaced from one another and face toward one another along the length of the structural member. Sutures that are used to implant the prosthesis and that are respectively adjacent to these two transverse surface portions are thereby prevented from moving farther apart along the length of the prosthesis.
1 . An annuloplasty prosthesis comprising:
an elongated structural member that is curved along its length to correspond to a portion of a cardiac valve annulus, the structural member including first and second surface portions that are transverse to adjacent portions of the surface of the structural member and that are spaced from and face toward one another along the length of the structural member.
2 . The prosthesis defined in claim 1 further comprising:
a cover covering the structural member.
3 . The prosthesis defined in claim 2 wherein the cover comprises fabric.
4 . The prosthesis defined in claim 2 wherein the cover comprises a coating of substantially continuous, polymeric material.
5 . The prosthesis defined in claim 1 wherein the structural member is substantially rigid.
6 . The prosthesis defined in claim 1 wherein the structural member is semi-rigid.
7 . The prosthesis defined in claim 1 wherein the first and second surface portions are adjacent respective opposite ends of the structural member.
8 . The prosthesis defined in claim 1 wherein the structural member further includes a third surface portion that is transverse to the adjacent portion of the surface of the structural member and that is intermediate the first and second surface portions.
9 . The prosthesis defined in claim 1 wherein the first and second surface portions are each prominent enough to be engaged by suture material.
10 . The prosthesis defined in claim 1 wherein at least one of the first and second surface portions comprises a hook that extends transversely from the adjacent portion of the structural member.
11 . The prosthesis defined in claim 1 wherein at least one of the first and second surface portions comprises a transverse enlargement of the structural member.
12 . The prosthesis defined in claim 1 wherein at least one of the first and second surface portions comprises a loop formed by the structural member.
13 . The prosthesis defined in claim 1 wherein the structural member is generally U-shaped.
14 . The prosthesis defined in claim 1 wherein the structural member is generally C-shaped.
15 . The prosthesis defined in claim 1 wherein the structural member lies substantially in a plane.
16 . The prosthesis defined in claim 1 wherein the structural member lies substantially in a saddle-shaped geometrical surface.
17 . An annuloplasty method comprising:
providing an annuloplasty prosthesis that includes an elongated structural member that is curved along its length to correspond to a portion of a cardiac valve annulus, the structural member including first and second surface portions that are transverse to adjacent portions of the surface of the structural member and that are spaced from and face toward one another along the length of the structural member;
implanting the prosthesis so that the structural member is adjacent and generally parallel to the portion of the cardiac valve annulus; and
suturing the prosthesis to adjacent tissue, with at least some sutures used in the suturing being respectively adjacent the first and second surface portions so that the first and second surface portions resist movement of those sutures farther away from one another along the length of the structural member.
18 . The method defined in claim 17 wherein the prosthesis further includes a suture-penetrable cover over the structural member, and wherein the suturing comprises:
passing the sutures through the cover to respectively engage the first and second surface portions.
19 . The method defined in claim 17 wherein the prosthesis further includes a third surface portion that is transverse to the adjacent portion of the surface of the structural member and that is intermediate the first and second surface portions, and wherein the suturing comprises:
applying a further suture adjacent the third surface portion.
20 . The method defined in claim 19 wherein the third surface portion comprises a transverse loop of the structural member, and wherein the applying comprises:
passing the further suture through the loop.