Fail safe system for a patient triggered respirator

Details Fail safe system for a patient triggered respirator Fail safe system for a patient triggered respirator

1974-10-21

1976-04-27

Michell, Robert W.

Surgery

Truss

Pad

128DIG17, 340279, A61M 1600

Patent

active

039527395

ABSTRACT:
A fail safe system for preventing erroneous activation of a device, such as a respirator, is provided to inhibit continuous or free running operation of the device as well as precluding activation of the device within an initial, predetermined portion of a phase in a cycle of operation. A circuit is provided for inhibiting the production of an output activation signal in the event that an input signal is continuously present or present at least at the start of a phase. In addition, a further circuit is provided for establishing a predetermined delay period commencing with the start of a phase for precluding the production of an output activation signal during such a period. Thus, only upon sensing the occurrence of a particular external condition after the aforementioned delay period has expired, will an output activation signal be produced.

REFERENCES:
patent: 2830580 (1958-04-01), Saklad et al.
patent: 3191595 (1965-06-01), Wilson
patent: 3357428 (1967-12-01), Carlson
patent: 3566387 (1971-02-01), Schoener et al.
patent: 3595228 (1971-07-01), Simon
patent: 3611178 (1971-10-01), McConnell
patent: 3678494 (1972-07-01), Setser

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