Apparatus for testing pulmonary functions
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United States of America Patent
Stats
-
Apr 12, 1988
Grant Date -
N/A
app pub date -
Apr 24, 1981
filing date -
Apr 24, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for testing pulmonary functions uses a hollow tube having a venturi therein and an aspirator orifice in the hollow tube adjacent the venturi. A pressure signal analogous to the flow of air through the hollow tube is generated in the aspirator orifice. Various means are provided to respond to the pressure at the aspirator orifice and a timed cut off of the aspirator orifice is provided for measuring the flow for a predetermined time period, such as one second, thereby indicating the forced expiratory volume for one second (FEV.sub.1) without having to blow into expansible chambers, such as bellows or bags to determine the volume of air passing through the tube. The apparatus is adapted to measure the total volume of air passing through the tube, or the total volume during a predetermined time period. Timed cut off of the aspirator orifice is accomplished by both mechanical and electrical means and the measuring of the aspirator orifice pressure is accomplished either with a liquid column or with an enclosed variable volume chamber, having electrical or mechanical indicators to determine the position of the reduced volume in the chamber.
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