Patent ID: 7736393
Filing Date: 2010-06-15
Classification: A61L,Y10S

Abstract:
1. An artificial dura mater comprising a laminate of at least two layers of in vivo degradable polymers, at least one layer of them being a substrate layer, said substrate layer being formed of a lactic acid/glycolic acid/ε-caprolactone copolymer, said copolymer having a lactic acid/glycolic acid/ε-caprolactone component molar ratio of 60-85:3-15:10-30 mol % and the copolymer having an average chain length that satisfies the following expressions (1) to (3), wherein L(LA) is an average chain length of lactic acid units, L(GA) is an average chain length of glycolic acid units, L(CL) is an average chain length of caprolactone units, LA% is a molar ratio of a lactic acid component in the copolymer, GA% is a molar ratio of a glycolic acid component in the copolymer, CL% is a molar ratio of a caprolactone component in the copolymer and X is a polymerization degree of the copolymer, wherein said copolymer is obtained by a two-step polymerization process which comprises the steps of