Surgery – Truss – Pad
Patent
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
Hurd Claude C.
Munson Ramon J.
Weigl James
Becker William G.
Bourns Inc.
Michell Robert W.
Recla Henry J.
Ware Paul H.
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