Patent ID: 7588707
Filing Date: 2009-09-15
Classification: A61L,B29C,B29K,B29L,B32B,C08G,F16L,Y10T

Abstract:
1. A process for making a multilayer tube comprising: providing a hard aliphatic polyurethane selected from the group consisting of polyether polyurethane and polycarbonate polyurethane having a Shore hardness from about 95A to about 85D as measured according to ASTM D2240, with the proviso that if said aliphatic polyurethane is a polycarbonate polyurethane, said Shore hardness of said hard aliphatic polyurethane is from about 70A to about 80D, and a soft aliphatic polyether polyurethane having a Shore hardness from about 40A to about 95A as measured according to ASTM D2240; coextruding said soft aliphatic polyurethane and said hard aliphatic polyurethane to form a multilayer tube; wherein both of said soft aliphatic polyurethane and said hard aliphatic polyurethane are biocompatible and biostable.