Flowmeter for providing synchronized flow data and respiratory g

Surgery – Truss – Pad

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128725, 23232E, 734215R, 250294, 422 84, A61B 508

Patent

active

041789199

ABSTRACT:
Respiratory gas flow data is synchronously provided along with continuous samples of the gases for analysis by a medical mass spectrometer. The gas flow data is determined by use of the differential pressure across a resistive core in a sampling flowmeter and the flow value at any instant is registered by proportionately admitting a non-toxic gas that is foreign to the normal respiratory gases into the sampling inlet in a quantity controlled by the differential pressure. The quantity of foreign gas therefore represents flow and is drawn through the inlet tube in exact synchronism with its corresponding respiratory gas sample for analysis by the spectrometer. The generated signal representing the amount of foreign gas, hence the flow, may then be used with the signals representing concentration of the various gases in the corresponding respiratory gas sample to calculate various medical parameters, such as oxygen uptake, where the exact synchronism of these signals is important.

REFERENCES:
patent: 3824390 (1974-07-01), Magyar
patent: 3896792 (1975-07-01), Vail et al.
Green et al, "A Simplified Closing Volume Method . . . " The Lancet, Oct. 28, 1972, pp. 905-906.

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