Photoplethysmography signal optimization method

A technology of photoplethysmography and optimization methods, which is applied in measuring pulse rate/heart rate, medical science, sensors, etc., can solve problems such as multiple noises, and achieve the effect of ensuring signal quality, good waveform characteristics, and removing noise

Inactive Publication Date: 2020-08-14
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention mainly solves the technical problem that the photoplethysmography (PPG) signal in the prior art contains more noise, and provides a photoplethysmography optimization method that eliminates and reduces interference and noise

Method used

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  • Photoplethysmography signal optimization method
  • Photoplethysmography signal optimization method
  • Photoplethysmography signal optimization method

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Embodiment

[0067] Embodiment: A photoplethysmographic signal optimization method of this embodiment, such as figure 1 As shown, including the following steps:

[0068] S01: Acquire the photoplethysmographic signal and motion state signal of the subject synchronously;

[0069] S02. Perform the first round of optimization on the pulse wave signal, that is, determine whether the subject is in a static state, a slow walking state or a vigorous exercise state according to the motion state signal, and if the subject is in a vigorous exercise state, the pulse wave signal of the corresponding time period is eliminated;

[0070] S03. Perform denoising processing on the pulse wave signal after the first round of optimization;

[0071] S04. Extract the characteristic index of the denoising processed pulse wave signal;

[0072] S05. Compare the extracted characteristic index with the threshold range, and when at least one characteristic index falls outside the threshold range, mark the pulse wave period corr...

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Abstract

The invention discloses a photoplethysmography signal optimization method. The method comprises the following steps of S01, synchronously acquiring a photoplethysmography signal and a motion state signal of a testee; S02, performing first-round optimization on the pulse wave signal, namely judging whether the testee is in a static state or a slow walking state or a strenuous exercise state according to the exercise state signal, and if the testee is in the strenuous exercise state, removing the pulse wave signal in the corresponding time period; S03, carrying out denoising processing on the pulse wave signal after the first round of optimization; S04, carrying out feature index extraction on the pulse wave signals subjected to denoising processing; and S05, comparing the extracted characteristic indexes with a threshold range, when at least one characteristic index falls outside the threshold range, marking a pulse wave period corresponding to the characteristic index as an abnormal period and removing the abnormal period, and finally obtaining an optimized pulse wave signal. The scheme is suitable for the wearable medical equipment.

Description

Technical field [0001] The invention relates to the field of human blood pressure parameter processing, in particular to a photoplethysmographic signal optimization method. Background technique [0002] Photoplethysmography (PPG) is obtained by using photoelectric means to detect changes in blood volume based on the Beer-Lamber Law, referred to as PPG. It contains a lot of useful information related to the physiological system, and has been widely used in clinical vascular assessment and monitoring of physiological parameters such as cardiac output, blood pressure, respiration rate, heart rate and blood oxygen saturation. [0003] After the fixed wavelength of light is irradiated to the surface of the skin perpendicularly through the LED, the light intensity obtained from the photoelectric receiver will be weakened due to the absorption of light by the skin, muscle, blood, and bones. By measuring the transmission or reflection to the receiver The change in light intensity can dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/024A61B5/1455A61B5/00
CPCA61B5/02416A61B5/14551A61B5/7203A61B5/7225A61B5/725
Inventor 潘敏赵静曾甜
Owner ZHEJIANG UNIV
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