Method for determining gas content in a breathing apparatus, and a breathing apparatus operating according to the method
First Claim
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1. A method for determining a gas content of a gas component of breathing gas in a breathing apparatus, comprising the steps of:
- connecting a breathing apparatus to a patient exhibiting a respiratory cycle;
making at least one measurement of a speed of sound in said breathing gas and determining a gas content in said breathing gas from the speed of sound therein; and
synchronizing measurement of the speed of sound in said breathing gas with at least one predetermined time in said respiratory cycle.
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Abstract
In a method for determining the gas content, e.g. of oxygen in breathing gas in a breathing apparatus, and a breathing apparatus operating according to the method, the gas content is determined from the speed of sound in the breathing gas. In order to resolve the problems caused by temperature variations in gas samples, determination of the speed of sound is synchronized with one or more specific times in a respiratory cycle. Determination can then be made when conditions are most stable.
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Citations
16 Claims
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1. A method for determining a gas content of a gas component of breathing gas in a breathing apparatus, comprising the steps of:
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connecting a breathing apparatus to a patient exhibiting a respiratory cycle;
making at least one measurement of a speed of sound in said breathing gas and determining a gas content in said breathing gas from the speed of sound therein; and
synchronizing measurement of the speed of sound in said breathing gas with at least one predetermined time in said respiratory cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A breathing apparatus comprising:
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an inspiration line and an expiration line adapted for connection to a patient exhibiting a respiratory cycle wherein breathing gas is adapted to be carried to a patient through said inspiration line during an inspiration phase of said respiratory cycle and wherein breathing gas is conducted away from a patient through said expiration line during an expiration phase of said respiratory cycle; and
a gas meter in fluid communication with at least one of said inspiration line and said expiration line for determining a gas content of at least one gas component in said breathing gas, said gas meter determining a speed of sound in said breathing gas synchronized with at least one predetermined time in said respiratory cycle. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification