Patent ID: 7689284

Claim:
An implantable stimulator for stimulating a digestive organ comprising: a first implantable pseudounipolar electrode configured to be positioned in electrical contact with the digestive organ when deployed, wherein the first electrode has a first surface area in the range of about 2 mm 2 to about 20 mm 2 ; a second implantable electrode configured to engage tissue of the digestive organ and disposed so as to form an electrode pair with the first electrode when deployed, wherein the second electrode has a second surface area in the range of about 50 mm 2 to about 200 mm 2 ; and a retention device including said first electrode, the retention device in use, attaching to a wall of the organ so as to reduce movement of the retention device and maintain electrode contact between the deployed first electrode and the wall of the organ when the stimulator is implanted, so that the surface of the first electrode remains in electrical contact with the digestive organ during long-term implantation of the stimulator and long-term stimulation of the organ.