Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1977-05-05
1979-12-18
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340575, 340666, G08B 2100
Patent
active
041796926
ABSTRACT:
A switch placed in a bed under a patient, includes contacts which can make or break a connection to a signal processing circuit. The signal processing circuit charges a capacitor at a selected rate, when the switch is in a first state and discharges the capacitor when the switch is in a second state. A latch is set to actuate a signal when the voltage of the capacitor reaches a selected high value. By controlling the rates of charge and discharge of the capacitor it is possible to provide an indication of the degree of restlessness of the patient, the presence of the patient in bed, and whether the patient is out of bed.
REFERENCES:
patent: 3325799 (1967-06-01), Farris
patent: 3926177 (1975-12-01), Hardway, Jr. et al.
patent: 3991414 (1976-11-01), Moran
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