An apparatus for regulating the functioning of a patient's organ or duct. The apparatus includes an elongated member (21) having first end and second ends. A fastener is disposed on the first end of the elongated member. The fastener is configured to engage the second end of the elongated member so that the elongated member forms a ring around the organ or duct. A tension element (32) is slidably disposed within the elongated member. A drive element (35) is associated with and engaging the tension element for causing the tension element to control the tension applied by the elongated member against a patient's body organ or duct. An antenna/controller pod (23) is releasably coupled to the elongated member for control of the drive element.
