Method and apparatus for assessing blood concentration of volatile constituent

A technology of blood concentration and concentration, which is applied in the direction of analyzing materials, immunoassay, transportation and packaging, etc., which can solve the problems of increasing cost and time consumption

Active Publication Date: 2013-08-14
VEONEER SWEDEN AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Mouthpiece replacement between different subjects significantly increases the cost and time consumption of each measurement

Method used

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  • Method and apparatus for assessing blood concentration of volatile constituent
  • Method and apparatus for assessing blood concentration of volatile constituent
  • Method and apparatus for assessing blood concentration of volatile constituent

Examples

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Embodiment Construction

[0050] The method of the present invention is based on measuring the concentration of alcohol and carbon dioxide in the exhaled stream from the mouth of the subject, diluted in ambient air. As such, the method can use a sensor arrangement that can be placed at a distance from the subject's mouth and nose, preferably up to half a meter from the subject's mouth and nose. At this distance, the airflow exhaled by the subject may be diluted tenfold by ambient air.

[0051] According to the invention, the concentrations of carbon dioxide and alcohol are measured simultaneously in close proximity to each other in the air stream exhaled from a subject, such as a human being, C extco2 and C extEtoH . The dilutions of the two gases with respect to the corresponding alveolar concentrations are assumed to be equal and are determined in part by the alveolar volume V alv The associated dead volume V ds composition, resulting in part from the transient dilution of exhaled air from the su...

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Abstract

A method and apparatus for of assessing the blood concentration level in a human or animal subject, of a volatile blood constituent (preferably alcohol) is disclosed. The method comprises steps of positioning a sensor (21, 22) within the expiratory gas flow of the subject, wherein the sensor (21, 22) is configured to detect the presence of the constituent and provide a first output signal representative of the concentration of said constituent in air, and also to detect a presence of carbon dioxide and to provide a second output signal representative of the concentration of carbon dioxide in air. The flow of expiratory gases from the subject is sampled to provide a first signal and second signal in respect of the expiratory gases substantially simultaneously. The method also comprises the step of inputting said first and second signals obtained by the sampling step into an algorithm configured to compare the variation of the first signal over time with the variation of the second signal over time and, depending on the result of the comparison, to make said second signal representative of the degree of dilution of said expiratory airflow. The invention further includes an apparatus for carrying out the method.

Description

technical field [0001] The present invention relates to a method for determining the blood concentration level of a volatile blood component in a human or animal subject, and to a device for implementing the method. Background technique [0002] Traffic injuries related to vehicle drivers under the influence of alcohol or other drugs are a major problem in all modern societies. Many casualties or serious injuries, along with a high proportion of human tragedy and huge economic losses, can be attributed to this problem. Preventive measures should be sought from all sides and tried in every possible way. But it is important that the approach be realistic in terms of human behavior, reliability, and economics. [0003] Legislation regarding drugs and vehicle driving varies between countries, but generally reflects the magnitude of the problem in all modern societies. In Sweden and many other countries, driving a vehicle is prohibited if the blood alcohol concentration exceed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/497G01N33/98B60K28/06
CPCB60W2540/24G01N33/4972B60K28/066Y10T436/204165
Inventor 霍坎·彼得松贝尔蒂·赫克耶特·安德松
Owner VEONEER SWEDEN AB
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