Pneumatically powered oxygen pressure loss alarm system

Details Pneumatically powered oxygen pressure loss alarm system Pneumatically powered oxygen pressure loss alarm system

1982-08-03

1984-12-11

Frankfort, Charles

Signals and indicators

Alarms

Fluid-pressure variation

137557, 12820312, G01L 1912

Patent

active

044871554

ABSTRACT:
A pneumatically powered oxygen pressure loss alarm system for use in conjunction with a gas anesthesia machine having an oxygen supply circuit and a gas mixing circuit. The oxygen pressure loss alarm system comprises a volume chamber in which a pressurized volume of oxygen is maintained, an oxygen escape valve for venting the chamber when pressure within the oxygen supply circuit falls below a critical minimum level, and an audible alarm operable in response to the flow of oxygen vented from the chamber through the oxygen escape valve. In addition, a reverse flow of residual gas from the gas mixing circuit, through a master valve also used to shut off the gas anesthesia machine, is coupled to the alarm to provide an audible indication of machine shut-down.

REFERENCES:
patent: 3870012 (1975-03-01), Metivier
patent: 4176617 (1979-12-01), Pilipski
patent: 4237813 (1980-12-01), Howison

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