| 摘要 |
<p>A method and an apparatus for testing the strength of autologous tissue for use in tissue leaflets for constructing artificial heart valves. A strip of tissue is cut adjacent to the edge of the tissue leaflet which is subject to the greatest stress when the tissue leaflet is mounted in the artificial heart valve. The strip of tissue is subjected to a known load produced by a spring to give a go/no go test of tissue strength. The spring is mounted in a generally X-shaped device made up of a generally linear piece having a handle at one end and two generally V-shaped pieces. The centers of all three pieces are joined to one another by a pivot. A spring is attached to the ends of the two generally V-shaped pieces which are closest to each other . The strip of tissue is mounted on the end of the generally linear shaped piece which does not have a handle and the end of the generally V-shaped pieces which is closest to the end of the generally linear piece which is attached to the strip of tissue. The end of the generally V-shaped device closest to the handle of the generally linear piece is placed in contact with the handle of the generally linear piece, stretching the spring. The spring pulls apart the ends of the X-shaped device, exerting the known load on the test strip of tissue. If the test strip breaks under the known load, the autologous tissue is not suitable for use in the artificial heart valve.</p> |
