| 摘要 |
<p>A longitudinally compliant PTFE graft (20) is provided by compressing at least a portion of a porous PTFE tube (32) along its longitudinal axis (22) and coating at least the outer wall of the compressed portion of the PTFE tube (32) with a biocompatible elastomer for allowing the compressed portion of the tube (32) to be stretched along the longitunal axis (22). The PTFE tube (32) is compressed by pulling the tube (32) over a cylindrical mandrel of like diameter and applying a compression force to the tube (32) along its longitudinal axis (22). The compressed portion(s) is(are) secured against movement upon the mandrel, and a coating (38) of liquified polyurethane or other biocompatible elastomer is then applied over at least the compressed portion(s) of the tube (32). The elastomeric coating (38) may be applied by dip coating or spray coating techniques. After the elastomeric coating (38) has dried, the completed graft (20) is removed from the mandrel.</p> |
