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Method and device for evaluation of spirographic and gas exchange data

一种呼吸气体、通气装置的技术，应用在应用、诊断记录/测量、医药科学等方向，能够解决不能可靠地获得正确的诊断、监测等问题

Active Publication Date: 2010-01-27
KONINK PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, correct diagnosis, monitoring, or adequate ventilation of subjects are sometimes not reliably obtained

Method used

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  • Method and device for evaluation of spirographic and gas exchange data
  • Method and device for evaluation of spirographic and gas exchange data
  • Method and device for evaluation of spirographic and gas exchange data

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Embodiment Construction

[0033] Figure 1a schematically shows a capnography spirograph plotting the relationship between CO2 concentration and volume in an exhaled gas mixture in arbitrary units. Known general features of the trace are, for example, a low plateau at small volumes, representing air from the subject's non-alveolar airways, such as the bronchi, followed by a sharp rise, representing mixing of alveolar air, and finally an essentially linear The ramp, representing the increased CO2 concentration during exhalation of additional alveolar air.

[0034] In order to obtain the total exhaled volume of CO 2 , for example, a method can be employed in which a straight line A with a slope s as a fitting parameter is fitted to a substantially linear part. The second step is to find the volume V3 at which the measured areas q and p are equal according to Fowler as shown in the curve. The dead space of the airway is equal to the volume thus found. Note that other definitions are possible, such as vol...

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Abstract

The invention provides a method for obtaining and evaluating spirographic and gas exchange data, comprising measuring a concentration of a breathing gas gc(Vx) for a plurality of volumes Vx of breathing gas mix, wherein the measuring is performed on inhaled breathing gas mix, further comprising determining an apparatus dead space ApDS, of breathing gas mix in the apparatus not taking part in gas exchange, by evaluating the measured concentrations gc(Vx) as a function of the volume V of the inhaled breathing gas mix. The use of inhaled breathing gas mix allows to determine the apparatus dead space, which is an important parameter when evaluating ventilation efficiency and the like. Furthermore, the invention provides a method in which inhalation and exhalation parts of a spirogram are synchronised, by matching features thereof, in order to further improve the accuracy of gas exchange volumes and derived data. Finally, the invention provides a spirographic device and a patient ventilation apparatus, incorporating the present method.

Description

technical field [0001] The present invention relates to methods and devices for evaluating spirography and gas exchange data in order to obtain more informative and / or more precise information therefrom. Background technique [0002] In the prior art it is known to obtain spirograph information. In known spirography methods, such as described in WO 2006 / 018237, the concentration of a gas, often carbon dioxide or oxygen, in the exhaled gas mixture is measured for an exhaled volume of several values. In this way, the gas concentration as a function of volume is obtained. From this function it is possible to estimate the dead space of the airways, which refers to the volume of the respiratory gas mixture moving through the (ascending) airways such as the trachea and bronchi without entering the alveoli and thus not participating in gas exchange. Furthermore, this involves alveolar dead space, which is the volume of air remaining in the alveoli even after maximal exhalation. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/083
CPCA61B5/0836A61B5/0833
Inventor S·克斯特列A·施拉克
Owner KONINK PHILIPS ELECTRONICS NV
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