Communications: electrical – Systems – Call station
Patent
1979-09-28
1981-06-23
Pitts, Harold I.
Communications: electrical
Systems
Call station
340365C, G08B 108
Patent
active
042753830
ABSTRACT:
A patient signalling system comprising a touch sensitive capacitive transducer adapted to be conveniently and comfortably placed with a patient afflicted with an illness or paralysis rendering him incapable of producing any significant manual force or dexterity, a flexible electrical cable of appreciable length connected at one end to the transducer, and a circuit located remote from the patient and connected to the other end of the cable for converting a change in capacitance of the transducer when touched by the patient into an electrical signal for causing operation of an appliance such as a signalling or communication device connected to the circuit. The circuit includes an input stage in the form of a high input impedance semiconductor device, a direct coupled a.c. amplifier, a resistive coupled a.c. amplifier, and a d.c. semiconductor switch. The system can include provision for patient electrical isolation and low battery voltage indication.
REFERENCES:
patent: 3517120 (1970-06-01), Bunting
patent: 3581124 (1971-05-01), Flores
patent: 3740744 (1973-06-01), Nakada
patent: 3766404 (1973-10-01), Larson
patent: 3848249 (1974-11-01), Meiri
patent: 3857100 (1974-12-01), Baars
patent: 3877001 (1975-04-01), Bogut
patent: 3947696 (1976-03-01), Larson
patent: 4126874 (1978-11-01), Suzuki
White Mark D.
White Roland A.
LandOfFree
Patient signalling system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Patient signalling system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Patient signalling system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2210741