Method and device for physiologic analysis
First Claim
1. A method to determine physiological parameters from a breathing gas of a subject with an electrochemical sensor, the method comprising:
- placing an oxygen sensor in a mainstream of the breathing gas that is capable of making one or more measurements of a partial pressure of oxygen during one or several breathing cycles with a response time of less than 200 milliseconds, transmitting an electric sensor signal that is proportional to the oxygen partial pressure or shows a mathematical relation to the oxygen partial pressure to an electronic analyzer, determining an oxygen partial pressure curve from the partial pressure of oxygen as a function of time; and
determining a physiologic parameter from the one or more measurements of the partial pressure of oxygen, wherein the step of determining a physiologic parameter comprises the step of determining an inspiratory and an expiratory oxygen partial pressure from the measured oxygen partial pressure values.
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Abstract
A new method and a device are disclosed to determine physiologic parameters of a subject by analyzing it'"'"'s breathing gas with an electrochemical sensor. The measured components of the breathing gas allow for many conclusions about the condition of the subjects'"'"'s pulmonary system. It is therefore an objective of this invention to determine physiologic parameters from measuring the partial pressure of oxygen in the mainstream of the breathing gas. According to the invention the measurement can be performed non invasive and allows for conclusions about the respiratory and metabolic system of a subject. The invention makes a continuous measurement of the oxygen partial pressure possible, that almost shows no time delay. The invention allows for instance the determination of parameters like the oxygen concentration in the breathing gas, the oxygen consumption of the subject, the heart frequency, the respiratory quotient, the compliance of the pulmonary tract and other physiologic parameters.
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Citations
13 Claims
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1. A method to determine physiological parameters from a breathing gas of a subject with an electrochemical sensor, the method comprising:
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placing an oxygen sensor in a mainstream of the breathing gas that is capable of making one or more measurements of a partial pressure of oxygen during one or several breathing cycles with a response time of less than 200 milliseconds, transmitting an electric sensor signal that is proportional to the oxygen partial pressure or shows a mathematical relation to the oxygen partial pressure to an electronic analyzer, determining an oxygen partial pressure curve from the partial pressure of oxygen as a function of time; and
determining a physiologic parameter from the one or more measurements of the partial pressure of oxygen, wherein the step of determining a physiologic parameter comprises the step of determining an inspiratory and an expiratory oxygen partial pressure from the measured oxygen partial pressure values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device for the determination of physiologic parameters consisting of an electrochemical oxygen sensor and an electronic analyzer, such that:
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the sensor operates in a galvanic or potentiostatic mode;
a measurement is performed directly in a mainstream of a breathing gas;
the sensor measures an oxygen partial pressure with a response time of less than 200 milliseconds, and transmits a signal that is proportional to the oxygen partial pressure or is related to it by a certain mathematical function to the electronic analyzer. - View Dependent Claims (13)
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Specification