Polymer fabric compacting process
First Claim
1. A method of preparing a synthetic vascular graft, comprising the step of treating a porous polyester fabric with a member of the group consisting of gaseous NO2 and NO2 in solution in CH2 Cl2 under conditions such that said fabric is shrunk and the porosity thereof is reduced, thereby compacting said fabric.
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Accused Products
Abstract
Polyester fabric which may be in the form of a warp-knitted lock-stitched or tricot-stitched tubular construction is compacted by treatment with NO2 either in the gaseous phase or in solution. The product, after neutralization, washing and crimping is suitable for vascular prostheses. In one form, the compacted product is crimped and bifurcated. Shrinkage in both the longitudinal and transverse directions is at least 30%. The porosity of the fabric is reduced by the compacting treatment.
83 Citations
37 Claims
- 1. A method of preparing a synthetic vascular graft, comprising the step of treating a porous polyester fabric with a member of the group consisting of gaseous NO2 and NO2 in solution in CH2 Cl2 under conditions such that said fabric is shrunk and the porosity thereof is reduced, thereby compacting said fabric.
- 28. A polyester fabric compacted by a member of the group consisting of NO2 and a solution of NO2 in CH2 Cl2.
Specification