a porous weave of bioabsorbable filaments having an open mesh configuration is formed into an oblate shape having dimensions greater than the esophageal opening and gastric outlet of a stomach . the resulting prosthesis is deployed in the stomach and is of a size to be retained in the proximate portion thereof for exerting pressure on the upper fundus . the prosthesis limits the amount of food that may be held within the stomach , and exerts pressure on the fundus to create a sensation of being full , resulting in weight loss .