Carbon dioxide measurement from expired gases in a partial rebreathing anesthesia circuit
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United States of America Patent
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May 26, 1981
Issued Date -
N/A
app pub date -
May 17, 1979
filing date -
Feb 13, 1978
priority date (Note) -
Expired
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Abstract
A method of determining arterial carbon dioxide tension from mixed expired gases of a patient utilizing a partial rebreathing anesthesia circuit. An electrode is inserted into expired gases of a patient to measure expired carbon dioxide tension. An output signal from the electrode, which indicates expired carbon dioxide tension, has a very high impedance. By reducing the impedance of the output signal, a more usable signal is obtained. Also, the signal must be converted to a relatively linear function, which is then scaled to give a visual indication proportionate to the arterial carbon dioxide tension. The electrode is pre-calibrated by gases having known percentages of carbon dioxide. The scaling factor is included to compensate for differences between the expired carbon dioxide tension and arterial carbon dioxide tension.
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