Pulmonary function tester
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United States of America Patent
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Dec 15, 1992
Issued Date -
N/A
app pub date -
Oct 22, 1991
filing date -
Feb 10, 1988
priority date (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). The improved tester senses the ambient atmospheric pressure prior to and after sensing the pressure created by a patient's pulmonary function. The pressure created by a patient's pulmonary function is calibrated in view of the difference between the ambient atmospheric pressure sensed prior to and after sensing the pressure created by a patient's pulmonary function. In the preferred embodiment, during testing in the modes, when the airflow from a patient's pulmonary tract is detected to be below a selected value indicating minimal or substantially no airflow, a pressure transducer which is used to detect mouthpiece airflow is vented to the ambient 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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