Implantable medical elongated member including wire-like fixation elements
First Claim
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1. An apparatus comprising:
- an implantable elongated member configured to be coupled to a medical device to deliver a therapy from the medical device to a target therapy delivery site in a patient; and
a fixation mechanism mechanically coupled to the elongated member, the fixation mechanism comprising;
a first wire-like element configured to expand to engage with tissue of the patient; and
a second wire-like element axially displaced from the first wire-like element along a length of the elongate member and configured to expand to engage with the tissue of the patient.
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Abstract
An implantable medical elongated member, such as a lead or catheter, includes an integrated fixation mechanism that expands upon implantation of the elongated member to fix the elongated member relative to a target tissue site, such as tissue within the epidural region proximate the spine or the sacral foramen or subcutaneous tissue proximate to an occipital or other peripheral nerve. The fixation mechanism may include a plurality of wire-like elements, which may be configured in a substantial helical shape. The wire-like elements may be formed from an elastic or super-elastic material, and expand radially outward when a restraint mechanism is removed following implantation of the elongated member.
85 Citations
37 Claims
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1. An apparatus comprising:
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an implantable elongated member configured to be coupled to a medical device to deliver a therapy from the medical device to a target therapy delivery site in a patient; and a fixation mechanism mechanically coupled to the elongated member, the fixation mechanism comprising; a first wire-like element configured to expand to engage with tissue of the patient; and a second wire-like element axially displaced from the first wire-like element along a length of the elongate member and configured to expand to engage with the tissue of the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An electrical stimulation system comprising:
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an implantable electrical stimulator; a lead comprising; a lead body having a proximal end and a distal end; at least one stimulation electrode located proximate to the distal end of the lead body and electrically coupled to the electrical stimulator, wherein the electrical stimulator delivers electrical stimulation to a target stimulation site via the at least one stimulation electrode; and a fixation mechanism mechanically coupled to the lead body, the fixation mechanism comprising a first wire-like element and a second wire like element separated from the first wire-like element by at least one stimulation electrode, wherein the first and second wire-like elements are each expandable to substantially fix the lead body at the target stimulation site. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A method comprising:
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inserting an elongated member into a patient, wherein the elongated member includes a fixation mechanism mechanically coupled to the elongated member, the fixation mechanism comprising; a first wire-like element configured to expand to engage with tissue to substantially fix the elongated member proximate to a target therapy delivery site; and a second wire-like element configured to expand to engage with tissue to substantially fix the elongated member proximate to the target therapy delivery site, wherein the first wire-like element is axially displaced from the second wire-like element; and removing a restraint mechanism on the fixation mechanism, thereby permitting the wire-like elements to expand and extend from the elongated member. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification