Implantable electrical lead retention system and method
First Claim
1. A medical lead anchor for anchoring a lead relative to the epidural space of a human spinal cord, the anchor comprising:
- a body having first end defining a first collet socket and second end defining a second collet socket, each of the first and second collet sockets being deflectable between a locked position in which the collet socket is adapted to be fastened to a lead, and an unlocked position in which the collet socket is adapted to allow movement of the lead relative to the collet socket; and
a first collet collar and a second collet collar engaging the first and second collet sockets, respectively, and mounted on the body for movement relative to the first and second collet sockets, respectively, to move the first and second collet sockets between their locked and unlocked positions;
whereby the body is adapted to be fitted to the lead and fastened to human tissue adjacent the epidural space, and the lead is fastened by the first and second collet sockets to the anchor the lead against movement relative to the anchor and thereby relative to the human tissue and epidural space.
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Accused Products
Abstract
A medical lead anchor is described for anchoring a lead relative to the tissue. An exemplary double-acting collet mechanism may be provided in the anchor. The exemplary double-acting collet mechanism includes a first collet assembly, which provides greater retentive force against the lead in one direction, and a second collet assembly, which provides greater retentive force against the lead in other direction. Relatively soft and flexible elastomeric tissue-anchoring members may be provided along opposite ends of the medical lead anchor. These and other exemplary embodiments are described, including for example the combination of the anchor with a lead, a system and a method of use.
94 Citations
29 Claims
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1. A medical lead anchor for anchoring a lead relative to the epidural space of a human spinal cord, the anchor comprising:
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a body having first end defining a first collet socket and second end defining a second collet socket, each of the first and second collet sockets being deflectable between a locked position in which the collet socket is adapted to be fastened to a lead, and an unlocked position in which the collet socket is adapted to allow movement of the lead relative to the collet socket; and
a first collet collar and a second collet collar engaging the first and second collet sockets, respectively, and mounted on the body for movement relative to the first and second collet sockets, respectively, to move the first and second collet sockets between their locked and unlocked positions;
whereby the body is adapted to be fitted to the lead and fastened to human tissue adjacent the epidural space, and the lead is fastened by the first and second collet sockets to the anchor the lead against movement relative to the anchor and thereby relative to the human tissue and epidural space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A medical lead anchor for anchoring a lead relative to tissue, the anchor comprising:
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a body having first and second ends and a lumen extending between the first and second ends for receiving a lead; and
a double-collet, lead fastening mechanism including;
a first cantilever structure extending from the first end of the body in a first direction, and a second cantilever structure extending from the second end of the body in a second direction opposite the first direction, wherein each of the first and second cantilever structures are adapted to deflect between a locked position in which the cantilever structure is adapted to fasten against the lead, and an unlocked position in which the cantilever structure is not fastened against the lead;
a first collet collar and a second collet collar, each mounted on the body for rotational movement relative to the body between;
first positions wherein, in the first position of the first collet collar, the first collet collar does not to hold the first cantilever structure in its locked position so that the first cantilever structure is free to move to its unlocked position and, in the first position of the second collet collar, the second collet collar does not hold the second cantilever structure in its locked position so that the second cantilever structure is free to move to its unlocked position; and
second positions wherein, in the second position of the first collet collar, the first collet collar holds the first cantilever structure in its locked position and, in the second position of the second collet collar, the second collet collar holds the second cantilever structure in its locked position. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An implantable medical anchor for anchoring an implantable medical lead or catheter to tissue, the anchor having:
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a first end and a second end, and a lumen extending between the first and second ends defining a longitudinal axis wherein the direction along the longitudinal axis from the first end toward the second end of the anchor constitutes a first direction and the direction along the longitudinal axis from the second end toward the first end constitutes a second direction, the lumen being adapted to slidably receive a lead or catheter;
a first locking means for releasably locking the anchor to a lead or catheter such that the first locking means provides greater retentive force against the lead or catheter sliding relative to the anchor in the first direction than in the second direction; and
a second locking means for releasably locking the anchor to a lead or catheter such that the second locking means provides greater retentive force against the lead or catheter sliding relative to the anchor in the second direction than in the first direction. - View Dependent Claims (27)
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28. A method of anchoring an implantable medical lead to tissue, with an anchor, to retain the lead in the epidural space for spinal cord stimulation, the lead defining a first direction along the length of the lead and a second direction also along the length of the lead but opposite to the first direction, the anchor having a lumen for slidably receiving the lead and a double-acting collet mechanism, the double-acting collet mechanism including a first collet assembly providing greater retentive force against the lead in one of the first and second directions than in the other of the first and second directions, and a second collet assembly providing greater retentive force against the lead in the aforesaid other of the first and second directions than in the aforesaid one of the first and second directions, the method comprising:
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positioning at least a portion of the implantable medical lead within the epidural space;
before, during or after the step of positioning at least a portion of the implantable medical lead within the epidural space, inserting the lead in the lumen of the anchor and sliding the anchor into position on the implantable medical lead; and
either before or after the step of positioning at least a portion of the implantable medical lead within the epidural space but after the step of inserting the lead in the lumen of the anchor and sliding the anchor into position on the implantable medical lead, locking each of the first and second collet assemblies against the lead; and
fixing the anchor relative to tissue. - View Dependent Claims (29)
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Specification