Patent ID: 8391981

Claim:
An implantable medical device, comprising: a) a battery; b) at least one sensor that is powered by the battery and configured to monitor a physiological condition of the body of a patient; c) sensor electronics configured to process a signal received from the at least one sensor; d) a wireless receiver that is configured to continuously draw less than 10 micro-amps of current from the battery when implanted, wherein the receiver is configured to receive a first wireless communication from an external device in a first frequency band of a range of frequencies less than 1 MHz; and e) a wireless transmitter that is separate from the receiver, f) wherein after receipt by the receiver of a first wireless communication from the external device at the first frequency band, the wireless transmitter is configured to draw power from the battery and send at least one second wireless communication related to at least one physiological signal sensed by the at least one sensor to the external device using a second frequency in a range of frequencies above 10 MHz.