Method and device for determining per breath the partial pressure of a gas component in the air exhaled by a patient
First Claim
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1. A method for determining carbon dioxide content in respiratory air per breath, comprising:
- (a) continuously determining oxygen partial pressure in respiratory air using an oxygen sensor, wherein the oxygen sensor determines a minimum value of the oxygen partial pressure in exhaled air per respiratory cycle; and
(b) determining, as a maximum value of carbon dioxide in exhaled air, the absolute value of the difference between the minimum value of the oxygen partial pressure in exhaled air and the oxygen partial pressure in inhaled air.
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Abstract
The invention relates to an inexpensive method in which the partial pressure of a gas component in the air exhaled by a patient is determined per breath.
26 Citations
7 Claims
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1. A method for determining carbon dioxide content in respiratory air per breath, comprising:
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(a) continuously determining oxygen partial pressure in respiratory air using an oxygen sensor, wherein the oxygen sensor determines a minimum value of the oxygen partial pressure in exhaled air per respiratory cycle; and
(b) determining, as a maximum value of carbon dioxide in exhaled air, the absolute value of the difference between the minimum value of the oxygen partial pressure in exhaled air and the oxygen partial pressure in inhaled air. - View Dependent Claims (2, 3, 4)
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5. A device for determining carbon dioxide content in respiratory air per breath, comprising:
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(a) an oxygen sensor to continuously determine oxygen partial pressure in respiratory air, wherein the minimum value of the oxygen partial pressure in exhaled air is determined upon each respiratory cycle; and
(b) means to determine the absolute value of the difference between the instantaneous oxygen partial pressure in exhaled air and the oxygen partial pressure in inhaled air, wherein the absolute value is defined as the carbon dioxide content of the respiratory air;
wherein in (b), the means to determine the absolute value determines the difference between the minimum value of the oxygen partial pressure in the exhaled air and the oxygen partial pressure in the inhaled air such that the maximum value of carbon dioxide in the exhaled air is determined. - View Dependent Claims (6, 7)
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Specification