Pulmonary function tester
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United States of America Patent
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Oct 22, 1991
Issued Date -
N/A
app pub date -
Apr 12, 1990
filing date -
Feb 10, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved pulmonary function tester provides for dynamic calibration during patient testing of various modes such as Forced Vital Capacity (FVC), Resting Ventilation (RV), Negative Inspiratory Force (NIF) and Maximum Voluntary Ventilation (MVV). During testing in the modes, when the airflow is detected to be below a selected value indicating minimal or substantially no airflow, the pressure transducer which is used to detect mouthpiece airflow is vented to atmosphere, and data representing the output of the pressure transducer are taken and stored for calibration of later readings during testing.
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