POLYISOBUTYLENE URETHANE, UREA AND URETHANE/UREA COPOLYMERS AND MEDICAL LEADS CONTAINING THE SAME
First Claim
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1. An implantable medical lead comprising:
- an elongated polymeric component disposed over at least one electrical conductor, wherein the elongated component comprises a polyisobutylene-based urethane copolymer comprising a polyisobutylene segment and a polyether segment selected from the group consisting of linear, branched and cyclic homopoly(alkylene oxide) and copoly(alkylene oxide) segments, wherein the elongated polymeric component comprises a main lead portion ranging from about 5 cm to about 125 cm in length and having a Shore hardness ranging from about 75 A to about 100 A and a distal tip portion positioned distal to the main lead portion, said 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 30 A to 80 A.
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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 copolymers.
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Citations
29 Claims
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1. An implantable medical lead comprising:
an elongated polymeric component disposed over at least one electrical conductor, wherein the elongated component comprises a polyisobutylene-based urethane copolymer comprising a polyisobutylene segment and a polyether segment selected from the group consisting of linear, branched and cyclic homopoly(alkylene oxide) and copoly(alkylene oxide) segments, wherein the elongated polymeric component comprises a main lead portion ranging from about 5 cm to about 125 cm in length and having a Shore hardness ranging from about 75 A to about 100 A and a distal tip portion positioned distal to the main lead portion, said 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 30 A to 80 A. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of manufacturing an implantable medical lead comprising:
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forming a main tubular lead body portion from a polyisobutylene-based urethane copolymer comprising a polyisobutylene segment and a polyether segment selected from the group consisting of linear, branched and cyclic homopoly(alkylene oxide) and copoly(alkylene oxide) segments, the main lead body ranging from about 5 cm to about 125 cm in length and having a Shore hardness ranging from about 75 A to about 100 A; forming a distal tip portion positioned distal to the main lead portion, said 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 30 A to about 80 A; associating at least the main tubular lead body portion with a conductor and an electrode connected to the conductor. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An implantable medical lead comprising an elongated polymeric component comprising:
an elongated polymeric component disposed over at least one electrical conductor, wherein the elongated component comprises a polyisobutylene-based urethane, urea or urethane/urea copolymer comprising a polyisobutylene segment and a polytetramethylene oxide segment, wherein the lead includes at least one spiral loop when in a relaxed state, and wherein the Shore hardness of a surface of the elongated polymeric component that faces radially outward from the center of the spiral loop ranges between about 90 A and about 100 A and the Shore hardness of a surface of the elongated polymeric component that faces radially inward toward a center of the spiral loop ranges between about 50 A and less than 90 A.
Specification