Patent ID: 6743505
Filing Date: 2004-06-01
Classification: A61L,D02G,Y10T

Abstract:
A process for forming bioabsorbable, biocompatible multifilament yarn from Lactide-rich copolymers, comprising:extruding and spinning a copolymer comprising from about 80% to about 98% Lactide to form a multifilament spun yarn, applying a tension of at least about 5 grams to the spun multifilament yarn to form a pre-tensioned yarn, heating the pre-tensioned yarn at a temperature of from about 60Â° C. to about 99Â° C. for a period of not more than about 6 seconds to form a pre-tensioned, preheated yarn, annealing and drawing the pre-tensioned, preheated yarn for a first time by about 4Ã— to about 6Ã— at a temperature of from about 110Â°C. to about 150Â° C. for a time of about 0.1 to about 2 seconds, annealing and drawing the yarn for a second time by about 1.05Ã— to about 1.3Ã— at a temperature of from about 60Â° C. to about 150Â° C. for a time of about 0.1 to about 2 seconds, cooling the twice-drawn yarn; and taking-up the multifilament yarn.