| 摘要 |
<p>A heart valve replacement (HVR) is characterised by a two-part frame (F,M) with each part generally ring-shaped and covered with cloth (CF,CM), and at least one leaflet (L) having a margin (ML) passing between the two parts of the frame and stitched (SML) to the cloth-covering (CF) of one of the frame parts (F), the frame parts being secured together by stitching (S) between the cloth coverings (CF,CM) on the outside of both parts whereby the flexure or hinging (HL) line of the leaflet (L) will be along the nip between the two cloth-covered frame parts (F,M), which line is intermediate the main body of the leaflet (L) and the stitching (SML,S) both of its margin (ML) to the cloth-covering (CF) of one frame part (F) and of the cloth-covering (CF,CM) of both frame parts (F,M) to each other, completely eliminating any possibility of tearing between stitch holes.</p> |
