Hypoperfusion oxyhemoglobin saturation measuring method based on self-correlation modeling method

A measurement method and saturation technology, which is applied in the field of blood oxygen saturation detection, can solve the problems of weak periodic interference suppression ability, and achieve the effect of suppressing noise interference

Inactive Publication Date: 2013-04-10
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

On the basis of the DST algorithm, Yong-ShenYang et al. of the Chinese University of Hong Kong proposed the MCDST algorithm, which improves the adaptive filtering method. The assumption of orthogonality of periodic signals, so the method has weak ability to suppress periodic interference

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  • Hypoperfusion oxyhemoglobin saturation measuring method based on self-correlation modeling method

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[0031] The low perfusion blood oxygen saturation measurement method provided by the present invention, that is, the low perfusion blood oxygen saturation measurement method based on the autocorrelation modeling method, mainly includes two parts: signal autocorrelation and modeling.

[0032] The first step is to perform an autocorrelation operation on the signal.

[0033] For the PPG signal, within a certain sampling time, it can be regarded as a periodic definite signal, and for the AC component of the PPG signal, it can be expressed as In the formula, m is any integer, T is the period of the PPG signal, t is the time, P is the amplitude of the AC component of the pulse wave signal, f(t) is the AC component of the PPG signal, is the normalization function of f(t).

[0034] Autocorrelation operation is performed on the AC component f(t) of the PPG signal. Assuming that the noise during actual data sampling is N(t), the actual collected signal is F(t)=f(t)+N(t). Carrying ou...

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Abstract

The invention belongs to an oxyhemoglobin saturation detecting technology and relates to a hypoperfusion oxyhemoglobin saturation measuring method based on a self-correlation modeling method. According to the method, firstly, PPG (photoelectric plethysmogram) signals of red light and infrared light are subjected to digital filtering, in addition, the respective direct current components are calculated, then, the filtered signals are subjected to self-correlation, noise components in the signals are inhibited, the signal noise ratio is improved, finally, a parameter calculating method obtained by self-correlation signals through modeling is utilized for calculating the alternating current component, and in addition, the pulse rate, the oxyhemoglobin index and the oxyhemoglobin saturation are calculated. The method has the advantages that the noise interference of oxyhemoglobin signals is effectively inhibited, in addition, the method for parameter calculation through self-correlation signals is realized through modeling, and the accuracy of the pulse rate, oxyhemoglobin index and oxyhemoglobin saturation measurement at hypoperfusion is improved.

Description

technical field [0001] The invention belongs to the field of biological information detection, and specifically relates to blood oxygen saturation detection technology, in particular to a method capable of realizing accurate and stable measurement of pulse rate, blood perfusion index, blood oxygen saturation and other parameters when blood perfusion is low. Background technique [0002] Oxygen saturation (SpO2) is the percentage of oxyhemoglobin in the blood to the total hemoglobin that can bind oxygen. It characterizes the oxygen content of the blood and is an important parameter for judging the functions of the human respiratory system and circulatory system. Clinically, monitoring changes in human SpO2 plays an important role in the prevention and treatment of lung and heart diseases; at the same time, in surgery, anesthesia and intensive care, it is also necessary to monitor SpO2 to guide the operation or treatment process. Due to the convenience and safety of the non-in...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/1455A61B5/0205A61B5/0245
Inventor 杨玉星谢庆国艾志光谭双平
Owner HUAZHONG UNIV OF SCI & TECH
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