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US 2014/0194963 A1Published application
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
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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.
Claims19
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.
6 more elements
A method of manufacturing an implantable medical lead comprising:
- forming an elongated polymeric component comprising an inner elongated polymeric component and an outer elongated polymeric component disposed over at least a portion of the inner elongated polymeric component, the inner elongated polymeric component is formed from a first 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 inner elongated polymeric component comprises a main lead body 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 body portion of the inner elongated polymeric component, the distal tip portion of the inner elongated polymeric component ranging from about 1 cm to about 12 cm in length and having a lower Shore hardness than the main lead body portion of the inner elongated polymer component ranging from about 30A to about 80A, the outer elongated polymeric component comprises a main lead body portion ranging from about 5 cm to about 125 cm in length and having a Shore hardness and a distal tip portion of the outer elongated polymeric component positioned distal to the main lead body portion of the outer elongated polymeric component, 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 of the outer elongated polymeric component ranging from about 30A to about 80A;
- associating at least the main lead body portion of the inner elongated polymer component with a conductor and an electrode connected to the conductor.
Dependencies are inferred from the claim text.