Patent ID: 6034622
Filing Date: 2000-03-07
Classification: A61B,G01S,G07C,Y10S

Abstract:
An open-loop internal monitoring system comprising:a plurality of internal radio transmitters, each said internal radio transmitter being implanted in a human for transmitting a plurality of signal pulses, each said signal pulse being encoded with at least information uniquely identifying one said internal radio transmitter;a plurality of external radio receivers each having a corresponding clock, with said clocks associated with said external radio receivers being synchronized, each said external radio receiver for receiving each of said plurality of signal pulses transmitted by each of said plurality of internal radio transmitters and for generating from each said received signal pulse a plurality of data including at least (1) a time-of-arrival of when said signal pulse was received by said external radio receiver, the time-of-arrival being generated in accordance with said synchronized clock of said external radio receiver and (2) said internal radio transmitter identifying information decoded from said received signal pulse by said external radio receiver;a central processor for (1) estimating a location for each said internal radio transmitter, and thus for each said human, in accordance with the time-of-arrival generated by each of said plurality of external radio receivers, (2) storing, for each said human, authorized or unauthorized areas to which said human is assigned, (3) determining an event of whether the estimated location is within said authorized area or said unauthorized area assigned to any one of said humans and stored in said central processor, and (4) notifying a monitor of said central processor upon occurrence of said event; anda plurality of relays, each relay for relaying said plurality of data from each said external radio receiver to said central processor.