Metabolic calorimeter employing respiratory gas analysis
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United States of America Patent
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Jun 11, 2002
Grant Date -
N/A
app pub date -
Sep 19, 2000
filing date -
Feb 5, 1998
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Abstract
An indirect calorimeter for measuring the metabolic activity and related respiratory parameters of a subject includes a facial mask operative to be supported in contact with the subject so as to pass the inhalations and exhalations as the patient breathes. Both the inhaled and exhaled gasses pass through a tube which incorporates an ultrasonic pulse transit time flow meter adapted to generate electrical signals as a function of the instantaneous flow volume. A fluorescence quench oxygen sensor is supported in the flow tube and generates electrical signals as a function of the instantaneous oxygen content of the respiratory gasses. A computation unit receives output signals from the flow sensor and the oxygen sensor to calculate oxygen consumption and related parameters.
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