G - Physics – 08 – B
Patent
G - Physics
08
B
G08B 21/00 (2006.01) A61B 5/11 (2006.01) G08B 21/22 (2006.01)
Patent
CA 2113124
-27- MONITORING APPARATUS FOR ESTABLISHING PATIENT PRESENCE IN A SUPPORTING STRUCTURE Abstract Of The Disclosure A capacitive sensor pad includes a foam plastic pad and heavy aluminum foil plates located to the opposite side thereof. The plates are adhesively bonded to the inner surfaces of an outer cover. The capacitor of the pad is connected in circuit with an oscillator and produces a frequency related output. A ripple counter establishes a frequency related output related to the capacitance. A microprocessor reads the counter output and a plurality of samples are averaged to establish a reference base and the true weight effect of the patient on the sensing pad. Other factors which might effect the signal are readily attended to by programmed compensation. Each subsequent sample is averaged and compared with the reference base. If within a permitted range, the latest and current signal is averaged with the reference base and establishes a new base, and continuously tracks changes in the sensing system. A selected change in a selected time delay system by requiring a series of alarm states or immediately if advance warning is desired, actuates an alert or alarm system, which requires positive resetting to terminate the alarm system. The system is positively reset to return to normal position monitoring. The system may be set to automatically reset the alarm system after an alarm condition is established and then removed by the continuous tracking of the patient movement.
Heinze Eric T.
Joseph Peter
Scharpf Peter
Borden Ladner Gervais Llp
Heinze Eric T.
Joseph Peter
Scharpf Peter
LandOfFree
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