Method and apparatus for respiratory gas analysis employing measurement of expired gas mass
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United States of America Patent
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Jan 14, 2003
Grant Date -
Jan 31, 2002
app pub date -
Aug 20, 2001
filing date -
Aug 3, 1998
priority date (Note) -
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Abstract
The oxygen and carbon dioxide content of expired respiratory gas is determined by measuring the mass and volume of the expired breath. From the composition of the inspired gas which may either be assumed or measured, the mass of the inspired volume may be determined, and since the inspired and expired breaths contain the same mass of nitrogen, the oxygen and carbon dioxide content of the expired breath may be determined. Measurements of temperature and humidity may be required to account for temperature and humidity changes between the inhalation and the exhalation or the inhaled gas may be adjusted in temperature and humidity to equalize the inhaled and exhaled temperature and humidity conditions. The mass and volume of the expiration and the volume mass of the inhalations are determined by an ultrasonic transit time system and a gas density sensor.
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