An implant for placement within a hollow body organ. The implant includes a distension device having an undeployed shape for delivery within a hollow body and one or more deployed shapes for implantation therein. The distension device has sufficient rigidity in its deployed shape to exert an outward force against an interior of the hollow body so as to bring together two substantially opposing surfaces of the hollow body. The implant also includes a powered means for changing the deployed shape of the member while implanted within the hollow body including an apparatus operable to convert energy produced by the patient into energy to power the implantable device.