Abdominally implanted stimulator and method

1. A method for laparoscopically implanting a lead in a digestive organ comprising the steps of:

inserting a guidewire to an attachment site on the digestive organ so that the guidewire extends through a wall of the digestive organ between an internal cavity of the organ and an outer surface of the organ;

providing a lead comprising:

an anchor;

a guidewire lumen including a distal through hole; and

an electrode;

inserting the guidewire through the through hole and through the guidewire lumen of the lead, and advancing the lead over the guidewire so that the lead extends through the wall of the digestive organ; and

attaching the lead to the organ with the anchor extending along the outer surface of the organ so that the lead is implanted extending through the organ with the electrode in electrical contact with the tissue of the organ between the outer surface of the digestive organ and the internal cavity of the digestive organ.

2. The method of claim 1 wherein the step of providing a lead comprises:

providing an expandable member in a first more narrow configuration enclosed by a sheath;

wherein the step of inserting the lead over the guidewire comprises guiding the sheath with the guidewire to an anchor attachment site on the organ; and

releasing the expandable member from the sheath to expand to a second wider configuration.

3. The method of claim 1 wherein the step of providing a lead comprises providing a lead with an elongate portion; and

wherein the step of attaching the lead to the organ comprises inserting the elongate portion over the guidewire through the wall of the organ into the organ.

4. The method of claim 1 , wherein the elongate portion is positioned so that a temperature sensor of the lead is disposed within the internal cavity of the digestive organ and separated from the wall of the digestive organ.

5. A method for implanting a lead in a digestive organ comprising the steps of:

positioning a guidewire across a wall of the digestive organ;

advancing a lead over the guidewire toward the digestive organ, wherein the lead includes an elongate portion, a sensor, an electrode, and an anchor;

positioning the elongate portion across the wall of the digestive organ so that the anchor resides against an outer surface of the digestive organ, so that the sensor resides within an interior of the digestive organ, and so that the electrode is in electrical contact within the wall of the digestive organ;

attaching the anchor to the outer surface of the digestive organ;

stimulating the wall of the digestive organ with the electrode; and

sensing within the interior of the digestive organ with the sensor.

6. The method of claim 5 , wherein attaching comprises suturing the anchor to the outer surface of the digestive organ.

7. The method of claim 5 , wherein sensing comprises sensing temperature.

8. The method of claim 5 , wherein sensing comprises determining when food has been ingested.

9. The method of claim 5 , wherein sensing comprises identifying a composition of a material.

10. The method of claim 5 , further comprising laparascopically advancing a needle across the wall of the digestive organ and wherein positioning the guidewire comprises inserting the guidewire through the needle.

11. The method of claim 10 , wherein advancing the needle includes advancing the needle toward the digestive organ by laparoscopy.

12. The method of claim 5 , wherein the elongate portion includes a guidewire lumen extending at least partially therethrough, and wherein advancing the lead over the guidewire comprises passing the guidewire through the guidewire lumen.

13. The method of claim 5 , wherein the anchor comprises an expandable anchor collapsible in a sheath, further comprising removing the sheath to allow the expandable anchor to expand for residing against the outer surface of the digestive organ.

14. The method of claim 5 , wherein the sensor comprises a temperature sensor, and wherein the temperature sensor is positioned within the interior of the digestive organ separated from the wall of the digestive organ.