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Non-invasive breathing end-tidal carbon dioxide detection method

A carbon dioxide and detection method technology, applied in the medical field, can solve the problem of low measurement accuracy

Pending Publication Date: 2021-06-15
WEST CHINA HOSPITAL SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method takes advantage of the fact that the gas is absorbed by infrared light of a special wavelength, and has the advantages of high sensitivity and real-time response, but still has the problem of low measurement accuracy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A non-invasive breathing end-tidal carbon dioxide detection method, comprising the following steps:

[0020] A. Turn on the non-invasive ventilator to start oxygen delivery, collect the exhaled gas, and obtain the temperature and CO of the exhaled gas 2 concentration data;

[0021] B. Detection of CO according to the temperature of the exhaled gas 2 The concentration is corrected to obtain the corrected end-tidal gas CO 2 concentration;

[0022] C. According to the corrected CO 2 The concentration of CO was obtained by gas source component spectral analysis method. 2 partial pressure parameter;

[0023] D. According to CO 2 partial pressure parameter, to establish the CO 2 Partial pressure periodic variation function model, solve the model to obtain CO 2 Analyze waveforms of partial pressure versus time.

Embodiment 2

[0025] This embodiment is on the basis of embodiment 1:

[0026] The CO of the B step 2 The concentration correction method is:

[0027] The temperature is denoted as t and the differential voltage as x,

[0028] Then x = 0.0188t + 0.4279;

[0029] The CO2 concentration is denoted as y,

[0030] Then y = 100.6507 x2 – 238.1226x +140.7148.

Embodiment 3

[0032] This embodiment is on the basis of embodiment 1:

[0033] The D step, using the least squares method to establish CO 2 Partial pressure periodic variation function model.

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Abstract

The invention provides a non-invasive breathing end-tidal carbon dioxide detection method. The method comprises steps of acquiring temperature and CO2 concentration data of exhaled gas, correcting the detected CO2 concentration according to the temperature of the exhaled gas to obtain the corrected CO2 concentration of the end-expiratory gas, according to the corrected CO2 concentration, adopting a gas source component spectral analysis method to obtain CO2 partial pressure parameters, and establishing a CO2 partial pressure periodic change function model, and solving the model to obtain an analysis waveform of the CO2 partial pressure changing along with time. The method has the advantages of high efficiency and high precision.

Description

technical field [0001] The invention relates to the field of medical technology, in particular to a non-invasive breathing end-tidal carbon dioxide detection method. Background technique [0002] Medical carbon dioxide monitoring is clinical monitoring of end-tidal carbon dioxide concentration. It is one of the most important monitoring parameter technologies for critically ill patients in key departments such as clinical ICU, OR and ER. Indications are also one of the important parameters to ensure patient safety. As a non-invasive monitoring technology, end-tidal carbon dioxide monitoring has been widely used clinically. The continuous real-time monitoring of the detector can not only detect ventilation but also reflect the circulatory function and pulmonary blood flow in clinical practice. The carbon dioxide concentration value and capnography waveform, which characterizes end-tidal carbon dioxide monitoring, have special clinical significance for pulmonary ventilation. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
CPCG01N33/004G01N33/0062G01N33/007G01N33/0006
Inventor 牧杰
Owner WEST CHINA HOSPITAL SICHUAN UNIV
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