HIGH DIELECTRIC CONSTANT SHEATH MATERIALS FOR IMPLANTABLE MEDICAL DEVICE LEADS OR CATHETERS
First Claim
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1. A method comprising:
- forming a medical lead having a proximal end for electrical connection to a medical device and a distal end implantable proximate a target tissue, the lead comprising a conductor and a sheath disposed over the conductor, the sheath comprising a polymer and a filler mixed in the polymer, wherein the filler has a dielectric constant that is different from a dielectric constant of the polymer; and
selecting the weight percentage of the filler in the sheath such that energy induced by an external disruptive energy field in the conductor that is absorbed by the target tissue proximate the distal end of the lead is below a predetermined threshold energy.
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Abstract
A medical lead and a method of making the medical lead, the medical lead having a proximal end for electrical connection to a medical device and a distal end implantable proximate a target tissue. The lead includes a conductor and a sheath disposed over the conductor, the sheath comprising a polymer and a filler mixed in the polymer. The filler has a dielectric constant that is different from a dielectric constant of the polymer. The weight percentage of the filler in the sheath is selected such that energy induced by an external disruptive energy field in the conductor that is absorbed by the target tissue proximate the distal end of the lead is below a predetermined threshold energy.
8 Citations
26 Claims
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1. A method comprising:
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forming a medical lead having a proximal end for electrical connection to a medical device and a distal end implantable proximate a target tissue, the lead comprising a conductor and a sheath disposed over the conductor, the sheath comprising a polymer and a filler mixed in the polymer, wherein the filler has a dielectric constant that is different from a dielectric constant of the polymer; and selecting the weight percentage of the filler in the sheath such that energy induced by an external disruptive energy field in the conductor that is absorbed by the target tissue proximate the distal end of the lead is below a predetermined threshold energy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A lead for a medical device, the lead comprising:
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a conductor having a proximal end for electrically connecting to a medical device and a distal end implantable proximate a target tissue; and a sheath disposed over the conductor, the sheath comprising a polymer and a filler mixed in the polymer, wherein the filler has a dielectric constant that is different from a dielectric constant of the polymer; wherein the weight percentage of the filler in the sheath is selected such that an amount of energy induced by an external disruptive energy field in the conductor that exceeds a predetermined threshold energy is reflected away from the distal end of the lead. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A system comprising:
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a medical device; and a medical lead having a proximal end electrically coupled to the medical device and a distal end implantable proximate a target tissue, the lead comprising; a conductor; and a sheath disposed over the conductor, the sheath comprising a polymer and a filler mixed in the polymer, wherein the filler has a dielectric constant that is different from a dielectric constant of the polymer; wherein the weight percentage of the filler in the sheath is selected such that an amount of energy induced by an external disruptive energy field in the conductor that exceeds a predetermined threshold energy is reflected away from the distal end of the lead. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification