POLYISOBUTYLENE URETHANE, UREA AND URETHANE/UREA COPOLYMERS AND MEDICAL LEADS CONTAINING THE SAME

摘要

The present invention provides medical devices that contain polyisobutylene urethane copolymers, polyisobutylene urea copolymers and polyisobutylene urethane/urea copolymers. More particularly, the present invention provides medical leads that contain such copolymer.

主权项

1. An implantable medical lead comprising:
a first elongated polymeric component disposed over at least one electrical conductor, wherein the first elongated polymeric component comprises:
a main lead portion ranging from about 5 cm to about 125 cm in length and having a Shore hardness; anda distal tip portion positioned distal to the main lead portion of the first elongated polymeric component, the distal tip portion ranging from about 1 cm to about 12 cm in length and having a lower Shore hardness than the main lead portion of the first elongated component, wherein at least a portion of the first elongated polymeric component comprises a polyisobutylene-based urethane copolymer having a weight ratio of soft segments to hard segments ranging from 90:10 to 50:50; and a second elongated polymeric component disposed over at least a portion of the first elongated polymeric component, wherein the second elongated polymeric component comprises:
a main lead portion ranging from about 5 cm to about 125 cm in length and having a Shore hardness; anda distal tip portion positioned distal to the main lead portion of the second elongated polymeric component, the distal tip portion ranging from about 1 cm to about 12 cm in length and having a lower Shore hardness than the main lead portion of the second elongated polymeric component, wherein at least a portion of the second elongated polymeric component comprises a polyisobutylene-based urethane copolymer having a weight ratio of soft segments to hard segments ranging from 90:10 to 50:50.