Pressure monitoring system

Details Pressure monitoring system Pressure monitoring system

1976-06-16

1978-01-10

Cooper, William C.

Surgery

Truss

Pad

128 21A, H04M 1104

Patent

active

040680967

ABSTRACT:
A system for monitoring respiratory pressure or other pressure-variable function at a remote location develops within a transmitter terminal a carrier tone frequency-modulated according to applied pressure. The carrier tone is conveyed over a conventional telephone channel to a receiver terminal wherein an analog signal is developed from the carrier tone for application to recording or indicating instruments. The base frequency and deviation characteristic of the carrier tone is preset and non-user adjustable to avoid the necessity of setting up the system prior to use. To assure system continuity a pilot tone is generated at the receiver terminal and conveyed over the telephone channel to the transmitter terminal, and an alarm is sounded at the terminals when either but not both of the pilot and carrier tones are absent in the telephone channel. The terminals are preferably constructed within compact housings having wells for receiving the handsets of associated telephones for convenience of use.

REFERENCES:
patent: 3426150 (1969-02-01), Tygart
patent: 3726270 (1973-04-01), Griffis
patent: 3848591 (1974-11-01), Smythe
Bell Laboratories Record, "Electrocardiograms by Telephones," Feb. 1966 issue, pp. 43-47.

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