Heart valve replacements

• US 4,605,407 A
• Filed: 01/09/1984
• Issued: 08/12/1986
• Est. Priority Date: 01/11/1983
• Status: Expired due to Fees

• Current Assignee: University of Sheffield
• Original Assignee: University of Sheffield
• Inventors: Black, Martin M., Drury, Philip J., Tindale, Wendy B.
• Primary Examiner(s): Apley, Richard J.
• Assistant Examiner(s): Prizant, James
• Application Number:
  US06/569,383
• Time in Patent Office: 946 Days
• Field of Search: 3/1.5
• US Class Current: 623/2.17
• CPC Class Codes: A61F 2/2418 Scaffolds therefor, e.g. support stents
• CPC Class Codes: A61F 2220/0075 sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable

Abstract

A heart valve replacement 12 is characterized by a two-part frame with ring-shaped parts 14, 15 and having cloth coverings 16, 17. At least one leaflet 18 is provided having a margin 18X passing between the two parts 14, 15 of the frame and secured by stitching 19 to the cloth covering 16 of one of the frame parts 14. The frame parts are secured together by stitching 20 between the cloth coverings 16, 17 on the outside of both parts whereby the flexure or hinging line 21 of the leaflet 18 is along the nip between the two cloth-covered frame parts 14, 15. Thus, the line 21 is intermediate the main body of the leaflet 18 and the stitching 19, 20, thereby completely eliminating any possibility of tearing between stitch holes.

Claims

1. A heart valve replacement, comprising

a two-part frame with parts defining a nip therebetween, one part being generally cylindrical, and the other part being generally ring-shaped and wire-like;

cloth coverings over both frame parts;

at least two leaflets each having a margin passing between the two frame parts and continuing around the wire-like frame part to a line of stitching spaced from the nip and connecting said leaflet to the cloth covering of that wire-like frame part; and

stitching spaced from said nip and between the cloth coverings of the two frames securing said frame parts together;

said nip between the two frame parts defining flexure lines, one along each of said leaflets spaced from the line of stitching between said leaflet and the wire-like frame part and from the stitching securing said two frame parts together, whereby during leaflet flexing tearing of either of said leaflets between stitch holes of the stitching is eliminated.

2. A heart valve replacement as in claim 1, wherein said wire-like frame part is convoluted and the other frame part is a portion of a cylinder with a convoluted profile to match the convoluted profile of said wire-like frame part.

3. A heart valve replacement as in claim 1, further including a cloth covered ring, said sewing ring being connected to said generally cylindrical frame part by the cloth coverings of said sewing ring and said generally cylindrical frame part.

4. A heat valve replacement as in claim 1, wherein said heart valve includes a valve opening and said wire-like frame part is adjacent said opening.