System for determining the volume value of a confined space
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United States of America Patent
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-
Dec 6, 1983
Grant Date -
N/A
app pub date -
Sep 9, 1980
filing date -
Sep 14, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
System for measuring the volume value of a confined space, in particular the functional residual capacity of the lungs of a patient, by means of a measuring space having a variable volume and a gas analyzer, which measuring space can be connected to the confined space and is provided with means for supplying and removing air, as well as for supplying oxygen and a detectable gas, the gas analyzer generating an output signal which is a linear function of the concentration of this detectable gas and the zero level of which is adjustable. The system having means allowing the output signal of the gas analyzer to be adjusted to zero before the detectable gas is supplied to the measuring space, an adjusting device allowing the output signal of the gas analyzer and a reference voltage to be equalized after the detectable gas has been supplied to the measuring space, and means which, after the measuring space has been brought into communication with the confined space, generate an output signal which corresponds to the volume value of the confined space and which is supplied to a display device.
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