an implant for placement within a hollow body organ . the implant includes an implantable distension device having an undeployed shape for delivery within a hollow body and one or more deployed shapes for implantation therein . the implantable 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 includes a powered means for changing the deployed shape of the implantable distension device while implanted within the hollow body . the implant also includes an implantable sensing device in communication with the implantable distension device and configured to sense a parameter related to the implantable distension device and to communicate the parameter to a filter , the filter transmits a selected portion of the parameter to a data storage device .