Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Patent
1982-12-27
1985-10-15
Rowland, James L.
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
1375123, 137855, 128725, 12820423, 116270, F16K 3700
Patent
active
045467935
ABSTRACT:
An improved switching device for indicating the beginning and ending of the breath of a test subject. A flow through housing is provided with an inlet and first and second outlets. A flexible diaphragm is connected in series with the first outlet to serve as a check valve which opens during the high flow rate portion of a breath. A sensitive flow responsive member connected in series with the second outlet opens in response to the presence of gas flow during the low flow rate portion of the breath. A detecting circuit responsive to the position of the flow responsive member accurately signals the beginning and ending of a breath without interference by the check valve.
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Rowland James L.
Sensormedics Corporation
Tumm Brian R.
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