A device, including an implant for placement within a hollow body organ. The implant includes a member having an undeployed shape for delivery within a hollow body and one or more deployed shapes for implantation therein. The member 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 device includes a means for changing the deployed shape of the member while implanted within the hollow body. The means includes an antenna configured to wirelessly communicate with an external device. The external device is configured to communicate telemetrically with the member. The device further includes at least one means to limit rotational movement of the antenna relative at least one of the member and the external device.