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Method for eliminating interference to blood oxygen saturation monitoring

A technology of saturation and blood oxygen, which is applied in the field of interference elimination of blood oxygen saturation monitoring, can solve problems such as complex algorithms, difficult implementation, and large amount of calculation, and achieve the effect of simple construction method, good motion interference, and suppression of motion interference

Inactive Publication Date: 2012-06-20
INST OF FIELD OPERATION SURGERY NO 3 MILITARY MEDICL UNIV PLA
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  • Application Information

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Problems solved by technology

However, this algorithm needs to perform multiple adaptive filters in the range of 0-100% blood oxygen saturation to obtain a blood oxygen value. The algorithm is complex and the amount of calculation is large. limited, it is very difficult to realize

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  • Method for eliminating interference to blood oxygen saturation monitoring
  • Method for eliminating interference to blood oxygen saturation monitoring
  • Method for eliminating interference to blood oxygen saturation monitoring

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with drawings and embodiments.

[0030] A method for eliminating interference in blood oxygen saturation monitoring, the steps of which are:

[0031] 1) Collect the PPG signal P of red light and infrared light, , the acquisition signal P contains the target signal S and the interference signal N, and ac and dc respectively represent the AC and DC components in the signal;

[0032] 2) The DC component of P Perform digital filtering to remove interference signals in the DC component , to get the DC component of the target signal , where the target DC component of the red light is , the DC component of the infrared light target is ;

[0033] 3) Use the adaptive denoising algorithm for the AC component of the target signal Motion Interference in Eliminate to get the AC component of the target signal , where the target AC component of the red light is , the AC component of the infrared t...

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Abstract

A method for eliminating interference to blood oxygen saturation monitoring includes steps of digitally filtering acquired red light and infrared light PPG (photoplethysmography) signals, removing low-frequency interference signals in direct current components, computing accurate direct-current component value, computing PPG signal envelope curves to extract alternating-current components, separating signals relevant with interference and serving the same as reference signals to be subjected to self-adaptive filtering, eliminating movement interference generated from aliasing of frequency and target signals in the alternating-current components, computing to obtain the accurate PPG alternating-current component value, and finally computing the blood oxygen saturation after the interference is eliminated according to the Lambert-Beer's law. The method is capable of suppressing movement interference well and computing to obtain the accurate blood oxygen saturation value. By extracting the reference signals directly from the red light and infrared light PPG signals to realize self-adaptive filtering, the method is simple in construction, simple in algorithm and small in computing number, has no need of an extra device for providing reference signals, is free of multiple self-adaptive filtering, and facilitates miniaturization and portability of monitoring equipment.

Description

technical field [0001] The invention relates to an interference elimination method, in particular to an interference elimination method for blood oxygen saturation monitoring. Background technique [0002] Compared with the traditional hospital environment blood oxygen saturation monitoring, the dynamic environment human blood oxygen saturation monitoring has a wider application prospect. It is used in pre-hospital first aid, battlefield soldier status monitoring, altitude sickness prevention, astronaut physiological state monitoring and other fields. can play a positive role. However, due to the influence of motion interference, the accuracy and stability of dynamic environmental blood oxygen saturation monitoring results are usually poor, which limits its development and application. [0003] In response to the above problems, in recent years, there have been many methods of suppressing motion interference at home and abroad, some have improved the probe structure, and so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/1455
Inventor 吴宝明龚渝顺
Owner INST OF FIELD OPERATION SURGERY NO 3 MILITARY MEDICL UNIV PLA
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