Multistage mixing valve for a medical respirator

Details Multistage mixing valve for a medical respirator Multistage mixing valve for a medical respirator

1977-01-03

1978-02-07

Michell, Robert W.

Surgery

Truss

Pad

128209, 128210, 137601, 137607, A61M 1600

Patent

active

040721485

ABSTRACT:
A valve assembly for mixing air and oxygen in a medical respirator over a wide range of volumetric flow rates, without sacrificing relative mixing accuracy at the lower flow rates. The assembly is divided into a plurality of mixing valve modules characterized respectively by progressively increasing volumetric flow capacities and progressively decreasing absolute mixing accuracies. The higher flow capacity modules are sequentially brought into operation as the overall valve flow increases and then interrupted when the flow decreases below a threshold level associated with each module. The valve assembly accordingly has a large range of flow capacities without degrading absolute mixing accuracy during low flow rate conditions by the effect of the higher capacity modules.

REFERENCES:
patent: 3586053 (1971-06-01), Browning
patent: 3669134 (1972-06-01), Dobritz
patent: 3693653 (1972-09-01), Cramer et al.
patent: 3807425 (1974-04-01), Boirum et al.
patent: 3809109 (1974-05-01), Breiling et al.
patent: 3817085 (1974-06-01), Stubbs
patent: 3896837 (1975-07-01), Rahling

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