Body activity sensors, such as termperature, motion, respiration and/or blood oxygen sensors, are positioned in a patient's body outside the pacer capsule. These sensors wirelessly transmit body activity signals, which are processed by circuitry in the heart pacer, such that a stimulation pulse generator...http://www.google.fr/patents/US4886064?utm_source=gb-gplus-shareBrevet US4886064 - Body activity controlled heart pacer
