The system of the present invention provides a link between the caregiver and the subject being monitored which utilizes an intermediate base station and redundant signal paths between the base station and the caregiver. The caregiver wears a unit which receives signals from the base station. Signals...http://www.google.com/patents/US4827943?utm_source=gb-gplus-sharePatent US4827943 - Portable, multi-channel, physiological data monitoring system
