Pressure fluid-actuated oscillator

Details Pressure fluid-actuated oscillator Pressure fluid-actuated oscillator

1976-03-05

1978-06-27

Cohan, Alan

Fluid handling

Self-proportioning or correlating systems

Supply and exhaust type

13762414, 91308, A61M 1600

Patent

active

040968758

ABSTRACT:
A pressure fluid-actuated oscillator, especially suitable for use in lung ventilation equipment for emergency use, comprises a double-piloted 5-port valve and biased timer valves controlling the supply to its pilots to provide for repeated changeover of the 5-port valve at intervals determined by the respective timing periods of the timer valves. One of the timer valves has an adjustable timing period whereas the other has a nominally fixed timing period but is made sensitive to the duration of the immediately preceding timing period determined by the adjustable timer valve so as automatically to change its timing period in the same sense as adjustment of the adjustable timer valve.
In lung ventilation equipment using such an oscillator, therefore, a single control may serve for directly setting the critical inhalation phase duration and to cause a complementary alteration of the exhalation phase duration that maintains the ratio of duration of the respective phases within desirably close limits.

REFERENCES:
patent: 2698517 (1955-01-01), Witt
patent: 2711717 (1955-06-01), Stacey
patent: 3225663 (1965-12-01), Pelisson
patent: 3614965 (1971-10-01), Metivier

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