Blood oxygen saturation measuring device and measuring method

A measuring device and saturation technology, which is applied in diagnostic recording/measurement, medical science, sensors, etc., can solve the problems of inaccurate calculation results, large amount of calculation, complex circuit structure, etc., and achieve no debugging, low cost, and accurate measurement Effect

Active Publication Date: 2012-01-18
TIANJIN UNIV
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a blood oxygen saturation measuring device and a measuring method, which solve the problems of complex circuit structure, large amount of calculation, and inaccurate calculation results. For details, see Described below:

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  • Blood oxygen saturation measuring device and measuring method
  • Blood oxygen saturation measuring device and measuring method

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Embodiment Construction

[0037] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] Due to the pulsation phenomenon of the artery, the blood flow in the blood vessel changes periodically, and the blood is a highly opaque liquid, so the change of the pulsation will inevitably cause the change of the absorbance of the near-infrared spectrum, such as figure 1 shown.

[0039] Considering the lowest state of arterial vascular filling, the incident light from the light source is not absorbed by the pulsating arterial blood, and the outgoing light intensity I max The strongest, can be regarded as the incident light I of pulsating arterial blood; and the state of the highest arterial blood vessel filling corresponds to the valley point of the photoelectric pulse wave, that is, the moment when the pulsating arterial blo...

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Abstract

The invention discloses a blood oxygen saturation measuring device and a measuring method. The measuring device is characterized in that a microprocessor outputs square waves at different frequencies and in twice rate relationship, the square waves drive at least two kinds of light emitting diodes, light emitted by the light emitting diodes is received by a photosensor after passing through a finger to be measured, the light is converted into voltage signals by the photosensor, the voltage signals are converted into preset amplitude voltage signals through a current / voltage conversation amplifier, an analog to digital converter converts the preset amplitude voltage signals into digital signals, the microprocessor processes the digital signals, and the blood oxygen saturation is obtained. The measuring method comprises the steps that: the microprocessor carries out separation processing on the digital signals, photoelectric volume pulse waves are obtained, and the background light interference is eliminated; a valley value and a peak value are obtained according to the photoelectric volume pulse waves; the valley value and the peak value are calculated to obtain a Q value; and the blood oxygen saturation is calculated through the Q value, and the blood oxygen saturation is obtained. Square wave frequency division modulation and digital demodulation are adopted, and the blood oxygen saturation measuring device and the measuring method have the characteristics that the measurement is accurate, the circuit is simple, and the cost is low.

Description

technical field [0001] The invention relates to a blood oxygen saturation measuring device and a measuring method. Background technique [0002] In the prior art, the measurement of blood oxygen saturation is based on empirical formulas, that is, measuring the PPG (Photo Plethysmo Graphy, photoplethysmography) of red light and infrared light and extracting the respective AC and DC components from it, and then using these The so-called R value (blood oxygen content) is extracted from the signal, and then the blood oxygen saturation is calculated according to the empirical formula, such as the invention patent "A Method for Detection of Blood Oxygen Saturation" proposed by Li Qingbo (public number: CN101433463A, public date: 2009 May 20) etc. [0003] In order to improve the measurement accuracy of blood oxygen saturation, the invention patent "blood oxygen saturation measurement method and device" (publication number: CN101347334, published on January 21, 2009) proposed by L...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/1455
Inventor 林凌李哲李刚
Owner TIANJIN UNIV
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