Implanted medical devices which require electrical power need to be replaced every few years due to the fact that batteries in such devices become discharged or worn out. Such replacement can involve surgery that presents a risk to patients. Disclosed is an implantable medical device and methods of using the medical device, the medical device including a guided surface wave receive structure configured to receive a guided surface wave transmitted by a guided surface waveguide probe. The guided surface wave receive structure in the medical device generates an alternating current signal when the guided surface wave is received. The medical device includes a power circuit that is coupled to the guided surface wave receive structure. The power circuit includes a power storage circuit to store the power signal. The medical device includes a medical circuit that comprises a stimulus circuit, a monitoring circuit, and potentially other components. The stimulus circuit provides a stimulus to a human body. The monitoring circuit measures a characteristic of the human body.
