A method and assembly for monitoring respiration and detecting apnea. The assembly includes an oscillator for generating an electromagnetic field having an output frequency in the radio frequency range and a high Q passively tuned LC circuit which has a resonant frequency variable in the radio frequency...http://www.google.co.uk/patents/US4433693?utm_source=gb-gplus-sharePatent US4433693 - Method and assembly for monitoring respiration and detecting apnea
