A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
73/104, 358/9
A61B 5/08 (2006.01) G01F 1/36 (2006.01) H01J 49/04 (2006.01) H01J 49/24 (2006.01)
Patent
CA 1133279
ABSTRACT OF THE DISCLOSURE 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.
324408
Osler Hoskin & Harcourt Llp
Perkin-Elmer Corporation The
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