Apparatus for measurement of gas concentrations in breath

A concentration and gas technology, applied in measurement devices, respirators, diagnostic recording/measurement, etc., can solve problems such as oxygen consumption and carbon dioxide production calculation, achieve easy assembly and adjustment, elimination of transit delay problems, high accuracy sexual effect

Active Publication Date: 2014-05-21
OXFORD UNIV INNOVATION LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] US 6,884,222 discloses a device for measuring the respiratory quotient, which is the ratio of increasing carbon dioxide concentration to decreasing oxygen concentration in exhaled breath, but neither oxygen consumption nor carbon dioxide production can be calculated based on this ratio information alone Calculate

Method used

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  • Apparatus for measurement of gas concentrations in breath
  • Apparatus for measurement of gas concentrations in breath
  • Apparatus for measurement of gas concentrations in breath

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Embodiment Construction

[0043] figure 1 An oxygen and carbon dioxide monitor according to an embodiment of the present invention is schematically shown. From figure 1 It is seen that the present invention allows direct measurements only a few centimeters from the subject, and since the device can be included in common breathing tubes such as ventilation tubes or anesthesia tubes, the measurements are performed in a non-invasive manner. These advantages mean that the measurements are made in real time every few tens of milliseconds and there is no time delay between the concentration measurement and the flow measurement. A suitable biofilter located between the subject and the device can be used multiple times without sterilization.

[0044] The present invention uses cavity enhanced absorption spectroscopy (CEAS) at about 760 nm for oxygen measurement and direct absorption or wavelength modulation spectroscopy at about 2 μm for carbon dioxide measurement. These measurements provided sufficient sen...

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PUM

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Abstract

A device for measuring oxygen uptake and carbon dioxide production by a respiring subject based on the use of absorption spectroscopy. An absorption spectrometer using cavity enhanced absorption spectroscopy at 763 nm to measure oxygen concentration and direct absorption or wavelength modulation spectroscopy at 2.0035 μm for carbon dioxide concentration is incorporated into a breathing tube in proximity to the respiring subject. This provides measurements of oxygen and carbon dioxide concentration with a good temporal resolution which can be combined with measurements of flow rate as a function of time to obtain oxygen uptake and carbon dioxide production on a breath-by-breath basis. The device can also measure the concentration of water vapor and of anaesthetic gases in exhaled breath.

Description

technical field [0001] The present invention relates to the measurement of the concentration of molecular oxygen or the concentration of carbon dioxide or the total concentration of molecular oxygen and carbon dioxide according to the time of inspiratory breathing and exhaling breathing, and more particularly the object of the present invention is to measure the inhalation of oxygen by causing a human subject or an animal subject to breathe volume and carbon dioxide production. Background technique [0002] Accurately measuring oxygen consumption in the breath of a human subject or an animal subject is useful for assessing both cardiorespiratory and metabolic function. Measuring carbon dioxide production is useful in assessing metabolic function. Both measurements are useful in medical or veterinary applications, such as during administration of anesthesia or artificial or assisted ventilation to a subject and during exercise stress testing with both medical and athletic ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/083
CPCG01N2021/391A61M2230/43A61B5/087G01N2021/399A61B5/083G01N21/05A61M2016/1025A61M2016/103A61B5/097A61M2016/1035G01N21/39A61M2016/102A61M2230/437A61M2230/432G01N2201/0231G01N21/3504A61M2230/435
Inventor 皮特·阿利斯泰尔·罗宾斯格雷厄姆·汉考克罗伯特·佩弗雷尔格兰特·安德鲁·戴德曼·里奇
Owner OXFORD UNIV INNOVATION LTD
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