Delivery of implantable neurostimulators
An implant that includes an electrode is advanced to a nerve of a subject using a tube. The tube and the implant are arranged at a nonzero angle with respect to a skin surface of the subject, and the implant is passed distally from an opening of the tube, in a vicinity of a portion of the nerve. A longitudinal axis of the implant is realigned to become generally parallel with the skin surface, by proximally withdrawing the tube from the subject. Other embodiments are also described.
1. A method, comprising:
using a tube, advancing an implant that includes an electrode to a nerve of a subject, such that the tube and the implant are arranged at a nonzero angle with respect to a skin surface of the subject;
while the implant is not parallel to the skin surface of the subject, passing the implant distally from an opening of the tube, in a vicinity of a portion of the nerve; and
aligning a longitudinal axis of the implant to become generally parallel with the skin surface by proximally withdrawing the tube from the subject.
2. The method according to claim 1 , further comprising, while proximally withdrawing the tube from the subject, using a delivery manipulator to hold the implant still with respect to the portion of the nerve.
3. The method according to claim 1 , wherein the nerve is a tibial nerve of the subject.
4. The method according to claim 1 , wherein the nonzero angle is greater than 30 degrees.
5. The method according to claim 1 , wherein the nonzero angle is less than 45 degrees.
6. The method according to claim 5 , wherein the nonzero angle is greater than 30 degrees.
7. The method according to claim 1 , wherein advancing the implant comprises deforming the portion of the nerve from an original state to a deformed state, and wherein aligning the longitudinal axis of the implant comprises allowing the portion of the nerve to return to the original state by removing the tube from the subject.
8. The method according to claim 7 , wherein:
deforming the portion of the nerve comprises bringing a longitudinal axis of the portion of the nerve into alignment with the longitudinal axis of the tube; and
allowing the portion of the nerve to return to the original state comprises allowing the portion of the nerve to return to the original state, while keeping the implant in a generally constant angular disposition with respect to the portion of the nerve.
9. The method according to claim 8 , wherein allowing the portion of the nerve to return to the original state comprises allowing the portion of the nerve to return to the original state, while keeping the longitudinal axis of the implant generally parallel to the portion of the nerve.
10. The method according to claim 8 , wherein:
the implant includes at least two electrodes, and
allowing the portion of the nerve to return to the original state comprises allowing the portion of the nerve to return to the original state, such that each of the electrodes is positioned at the same distance from the nerve.