Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1997-09-26
2000-07-04
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
3405721, 3405731, G08B 1314
Patent
active
060845139
ABSTRACT:
A system for monitoring a person in a secured zone is disclosed. One or more transmitters transmit a first signal into the zone. The person wears a tag that receives the first signal. The tag transmits a second signal that is responsive to the first signal. A receiver receives the second signal and provides a third signal responsive to the first signal. A controller is connected to the receiver and includes a discrimination circuit that determines if the third signal is responsive to the first signal. The controller provides an alarm signal if responsiveness is found. The responsiveness may be a constant phase relationship, and data may be transmitted by the tag at a frequency derived from the first frequency. A three loop antenna, with each loop disposed in a unique plane is described. Each unique plane is substantially perpendicular to the other unique planes, in another embodiment. The tag includes a band removal circuit that senses the skin resistivity of the patient in another embodiment. The tag may also include a chest band that senses the respiration of the patient. The tag includes a power circuit that reduces power consumption in the event the second signal is not being transmitted.
REFERENCES:
patent: 4135184 (1979-01-01), Pruzick
patent: 4303910 (1981-12-01), McCann
patent: 4622542 (1986-11-01), Weaver
patent: 4779076 (1988-10-01), Weaver
patent: 4791412 (1988-12-01), Brooks
patent: 4851815 (1989-07-01), Enkelmann
patent: 4853692 (1989-08-01), Wolk et al.
patent: 4885571 (1989-12-01), Pauley et al.
patent: 4918432 (1990-04-01), Pauley et al.
patent: 4980671 (1990-12-01), McCurdy
patent: 5014040 (1991-05-01), Weaver et al.
patent: 5079541 (1992-01-01), Moody
patent: 5117222 (1992-05-01), McCurdy et al.
patent: 5298884 (1994-03-01), Gilmore et al.
patent: 5353011 (1994-10-01), Wheeler et al.
patent: 5440295 (1995-08-01), Ciecwisz
patent: 5512879 (1996-04-01), Stokes
patent: 5745036 (1998-04-01), Clare
Corrigan George R.
Hofsass Jeffery A.
Huang Sihong
Innovative Control Systems
LandOfFree
Method and apparatus for tracking a patient does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for tracking a patient, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for tracking a patient will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1490333