Pulmonary function tester

Details Pulmonary function tester Pulmonary function tester

1991-10-22

1992-12-15

Cohen, Lee S.

Surgery

Truss

Pad

36441303, A61B 5087

Patent

active

051707985

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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