| 摘要 |
An artificial vascular prosthesis is made by winding a thread around a tube (3) of warp knitted textile thermoplastics material held on a rigid former (1), removing the thread, then immediately applying an axial thrust to the tube to reduce the length of the tube by formation of corrugations (8) and then heat setting the material of the tube in its corrugated condition. Removal of the thread before compressing axially the tube material allows the tube material compressed by the encircling thread to relax while immediate application of the axial compressive thrust causes the tube to corrugate before the memory of the pressure applied by the thread has had time to dissipate. The finished prosthesis thus has corrugations without any reduction in pore size. <IMAGE> |
