| 摘要 |
1537448 Vascular prosthesis SUMITOMO ELECTRIC INDUSTRIES Ltd 17 Aug 1977 [20 Aug 1976 1 July 1977] 34467/77 Heading F2P A vascular prosthesis comprises a porous P.T.F.E. tube in which the pores are filled with at least one water-insolubilized water-soluble polymer. The tube may be prepared by stretching a P.T.F.E. tube in at least one direction, heat-treating the stretched tube to at least 327‹ C. to provide a microstructure of fibres and nodes and employing an aqueous solution of a water-soluble polymer which is filled into the pore spaces of the microstructure and then the tube treated to render it water-insoluble. This can be performed by heat-treatment, acetalization, esterification or an ionizing radiationinduced cross-linking reaction.
|
