Patent ID: 8903507

Claim:
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; and a 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; and a 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.