A medical device adapted for implantation into a patient receives electrical power from an extravascular power supply. The medical device has a first receiver for a first radio frequency (RF) signal from which energy is extracted to power the medical device, and a second RF signal carries an indication of an amount of that extracted energy. The extravascular power supply includes a source of electrical power and a power transmitter that emits the first RF signal which is varied in response to the indication from the second radio frequency signal. Animal physiological data also can be carried by the second RF signal. The medical device includes a system that monitors the effects of tissue stimulation and regulates subsequent stimulation accordingly.

 
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