System and method for stimulation with electrode

1. A method for modulating excitable tissue in a body of a patient, the method comprising:

placing a wireless implantable stimulator device at a target site in the patient's body, the stimulator device including one or more electrodes, each electrode having a conducting surface facing an inside of the wireless implantable stimulator device;

reconfiguring the wireless implantable stimulator device from a first configuration incapable of substantially surrounding the excitable tissue to a second configuration that forms an enclosure that substantially surrounds the excitable tissue at the target site with the electrodes on the inside of the enclosure and facing the excitable tissue; and

causing electrical impulses to be generated on the wireless implantable stimulator absent an on-board power source, wherein the electrical impulses are delivered to the electrodes on the wireless implantable stimulator device such that neural modulation is applied to the excitable tissue substantially surrounded by the enclosure.

2. The method of claim 1 , further comprising:

wirelessly transmitting electrical energy from a pulse generator located outside the patient's body and through non-inductive coupling to the wireless implantable stimulator device such that the electrical impulses are generated using the electrical energy received through the non-inductively coupling.

3. The method of claim 2 , wherein placing the wireless implantable stimulator device comprises:

placing an introducer into the patient's body near the target site; and

inserting the wireless implantable stimulator device through an inner lumen of the introducer.

4. The method of claim 3 , wherein the inner lumen of the introducer is 1.2 mm or less in diameter.

5. The method of claim 3 , further comprising:

constraining the wireless implantable stimulator device that is a helical wireless implantable stimulator device into a substantially linear shape within the inner lumen of the introducer; and

advancing the helical wireless implantable stimulator device through the inner lumen of the introducer to the target site and out of a distal end of the inner lumen of the introducer towards the excitable tissue such that the helical wireless implantable stimulator device winds around the excitable tissue to form the enclosure that substantially surrounds the excitable tissue.

6. The method of claim 1 , wherein placing the wireless implantable stimulator device comprises:

surgically creating an opening on the patient's body;

through the opening, exposing the excitable tissue at the target site in the patient's body;

positioning the wireless implantable stimulator device that is an unfolded foldable cylindrical implantable stimulator device adjacent to the exposed excitable tissue at the target site; and

folding the foldable cylindrical implantable stimulator device around the excitable tissue to form the enclosure that substantially surrounds the excitable tissue.

7. The method of claim 1 wherein placing the wireless implantable stimulator device comprises:

placing an introducer into the patient's body towards the target site; and

advancing the wireless implantable stimulator device that is a foldable cylindrical wireless implantable stimulator device through an inner lumen of the introducer towards the target site until the foldable cylindrical wireless implantable stimulator device exits a distal end of the inner lumen of the introducer in an folded position;

unfolding the foldable cylindrical implantable stimulator device;

positioning the unfolded foldable cylindrical implantable stimulator device adjacent to the excitable tissue at the target site; and

folding the foldable cylindrical implantable stimulator device around the excitable tissue to form the enclosure substantially surrounding the excitable tissue.

8. The method of claim 7 , wherein said unfolding comprises:

pivoting a portion of the foldable cylindrical wireless stimulator device about a hinge.

9. The method of claim 7 , wherein said folding comprises:

pivoting a portion of the foldable cylindrical wireless stimulator device about a hinge.

10. The method of claim 1 wherein the electrodes of the wireless stimulator device include directional electrodes.

11. A device for modulating excitable tissue in a patient's body, the device comprising:

a wireless implantable stimulator device that includes one or more electrodes on an inner surface of the wireless implantable stimulator device, each electrode having a conducting surface facing an inside of the stimulator device,

wherein the wireless implantable stimulator device is reconfigurable in-situ and inside the patient's body from a first configuration incapable of substantially surrounding the excitable tissue to a second configuration that forms an enclosure that substantially surrounds the excitable tissue with the electrodes on the inside of the enclosure and facing the excitable tissue, and

wherein when electrical impulses are generated on the wireless implantable stimulator absent an on-board power source, the electrical impulses are delivered to the electrodes on the wireless implantable stimulator device such that neural modulation is applied to the excitable tissue substantially surrounded by the enclosure.

12. The device of claim 11 , further comprising:

one or more antennas configured to non-inductive couple to a pulse generator located outside the patient's body such that electrical energy is wirelessly received therefrom and through the non-inductive coupling.

13. The device of claim 11 , wherein under the first configuration, a portion of the wireless implantable stimulator device is shaped substantially linear, and

wherein under the second configuration, the portion of the wireless implantable stimulator device is shaped substantially helical.

14. The device of claim 13 , wherein the portion of the wireless implantable stimulator device that is shaped substantially helical forms the enclosure that substantially surrounds the excitable tissue.

15. The device of claim 11 , wherein the wireless implantable stimulator device comprises a cylindrical implantable stimulator device,

wherein the first configuration is an open position of the cylindrical implantable stimulator device, and

wherein the second configuration is a closed position of the cylindrical implantable stimulator device.

16. The device of claim 15 , wherein the implantable stimulator device further comprises a hinge, a first portion and a second portion; and

wherein the first portion and the second portion are coupled together with the hinge and are pivotable about the hinge to move from the open position to the closed position.

17. The device of claim 11 , wherein the electrodes of the wireless implantable stimulator device include directional electrodes.