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US 8,676,344 B2Granted
Polyisobutylene urethane, urea and urethane/urea copolymers and medical leads containing the same
AssigneeCardiac Pacemakers, Inc.
InventorsShrojalkmar Desai, Mark W. Boden, Stephen E. DeRoche, Arthur J. Foster, G. Shantanu Reddy
Life of this patent
Estimating the term…
Abstract
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.
Claims20
An implantable medical lead comprising:
- an elongated polymeric component disposed over at least one electrical conductor, wherein the 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 wherein the elongated polymeric component further comprises:
- a main lead portion ranging from about 5 cm to about 125 cm in length and having a Shore hardness ranging from about 75A to about 100A;
- and
- a distal tip portion positioned distal to the main lead portion, 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 body ranging from about 30A to 80A.
1 more element
A method of manufacturing an implantable medical lead comprising:
- forming a tubular main lead body portion from a polyisobutylene-based urethane copolymer comprising soft segments and hard segments and having a weight of soft segments to hard segments ranging from 90:10 to 50:50, the main lead body portion ranging from about 5 cm to about 125 cm in length and having a Shore hardness ranging from about 75A to about 100A;
- forming a distal tip portion positioned distal to the main lead body portion, the distal tip portion ranging from about 1 cm to about 12 cm in length and having a lower Shore hardness that the main lead body portion ranging from about 30A to about 80A;
- associating at least the tubular main lead body portion with a conductor and an electrode connected to the conductor.
Dependencies are inferred from the claim text.