An apparatus for diagnosing the functions of the internal organs and the autonomic nervous system of the living body in which a constant voltage is applied across two or more electrodes attached to the living body, a current flowing across the electrodes and changing from time to time is detected at...http://www.google.ca/patents/US4794934?utm_source=gb-gplus-sharePatent US4794934 - Apparatus for diagnosing the functions of the internal organs and autonomic nervous system of the living body
