Implantable medical lead with axially oriented coiled wire conductors
First Claim
1. An implantable medical lead for use with an implantable medical device, the lead comprising:
- a lead body that defines a first center axis;
multiple conductors located inside the lead body, wherein at least one of the conductors includes a coiled wire defining a lumen with a second center axis substantially parallel to the first center axis of the lead body; and
an extendable fiber disposed within the lumen defined by the coiled wire, wherein the medical lead has an axial stiffness that permits an axial elongation of approximately ten percent to approximately thirty percent without breakage of the medical lead and wherein the fiber limits the coiled wire to an axial stiffness in a range of approximately 0.105 kg/cm/cm to approximately 0.35 kg/cm/cm.
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Accused Products
Abstract
An implantable lead has a lead body construction designed to accommodate loading forces exerted on the lead body during patient movement. The lead body may be sufficiently stretchable to resist forces that could otherwise cause lead failure, axial migration of the electrodes, anchor damage, or tissue damage. Increasing stretchability of a lead body can also increase the vulnerability of the lead body to flex fatigue, buckling fatigue, kinking, and crush. Therefore, the lead described herein includes conductors that comprise coiled wires positioned substantially parallel to a center axis of the lead. The conductors described herein may be coiled around fibers that limit the axial stiffness of the coiled wires to ensure full recovery from axial loading.
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Citations
32 Claims
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1. An implantable medical lead for use with an implantable medical device, the lead comprising:
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a lead body that defines a first center axis;
multiple conductors located inside the lead body, wherein at least one of the conductors includes a coiled wire defining a lumen with a second center axis substantially parallel to the first center axis of the lead body; andan extendable fiber disposed within the lumen defined by the coiled wire, wherein the medical lead has an axial stiffness that permits an axial elongation of approximately ten percent to approximately thirty percent without breakage of the medical lead and wherein the fiber limits the coiled wire to an axial stiffness in a range of approximately 0.105 kg/cm/cm to approximately 0.35 kg/cm/cm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An implantable medical device comprising:
- a housing;
an implantable pulse generator, within the housing, that generates electrical stimulation pulses; and an implantable lead, extending from the housing, the implantable lead comprising;
a lead body that defines a first center axis, multiple electrodes, multiple conductors located inside the lead body, wherein at least one of the conductors includes a coiled wire defining a lumen with a second center axis substantially parallel to, but not coaxial with, the first center axis of the lead body, and wherein the conductors electrically couple the electrodes to the implantable pulse generator, andan extendable fiber disposed within the lumen defined by the coiled wire, wherein the medical lead has an axial stiffness that permits an axial elongation of approximately five percent to approximately thirty percent without breakage of the medical lead and wherein the fiber limits the coiled wire to an axial stiffness in a range of approximately 0.105 kg/cm/cm to approximately 0.35 kg/cm/cm. - View Dependent Claims (27, 28, 29, 30, 31)
- a housing;
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32. An implantable medical lead comprising:
- a lead body that defines a center axis, multiple electrodes, multiple conductors located inside the lead body, wherein at least one of the conductors includes a coiled wire defining a lumen with a center axis substantially parallel to the center axis of the lead body, and wherein the conductors electrically couple the electrodes to an implantable pulse generator; and
an extendable fiber disposed within the lumen defined by the coiled wire, wherein the extendable fiber limits the coiled wire to an axial stiffness in a range of approximately 0.105 kg/cm/cm to approximately 0.35 kg/cm/cm.
- a lead body that defines a center axis, multiple electrodes, multiple conductors located inside the lead body, wherein at least one of the conductors includes a coiled wire defining a lumen with a center axis substantially parallel to the center axis of the lead body, and wherein the conductors electrically couple the electrodes to an implantable pulse generator; and
Specification