Blood oxygen saturation measuring method and instrument

Abstract

The invention discloses a blood oxygen saturation measuring method and instrument and belongs to the technical field of measurement. The method includes utilizing light sources to emit red light and infrared, utilizing photoelectric receivers to acquire the maximum value and the minimum value of red light signals and infrared signals to obtain the ratio of the difference value of the maximum value and the minimum value of the red light signals and the difference value of the maximum value and the minimum value of the infrared signals, arranging the light sources and the photoelectric receivers in the way that at least two different distances are formed between the light sources and the receivers, repeating the steps to obtain more than two ratios, determining the ratio with the largest absolute value in the more than two ratios to calculate a blood oxygen saturation measuring value, wherein one light source and more than two photoelectric receivers with different distances between the light source and the receivers or one photoelectric receiver or more than two light sources with different distances between the receiver and the light sources are adopted to achieve the arrangement that at least two different distances are formed between the light sources and the receivers. By means of the blood oxygen saturation measuring method and instrument, the accurate blood oxygen saturation measuring value can be obtained, the blood oxygen saturation measuring accuracy is improved, and the use is simple.

Description

technical field [0001] The invention relates to a measuring method and a measuring instrument for human physiological information, in particular to a measuring method and measuring instrument for blood oxygen saturation. Background technique [0002] Blood oxygen saturation is the percentage of the capacity of oxygen-bound oxyhemoglobin in the blood to the total combined hemoglobin capacity, that is, the concentration of blood oxygen in the blood, which is an important physiological parameter of the respiratory cycle. Measuring the blood oxygen saturation of the human body has a wide range of applications in medicine. [0003] The blood oxygen saturation measurement method is proposed based on the Lambert-Beer law and the different light absorption characteristics of oxyhemoglobin and hemoglobin in blood. Light of two different wavelengths, usually red light of 600 to 700nm and infrared light of 800 to 1000nm, is irradiated into human tissue respectively, and after being re...

AI Technical Summary

Problems solved by technology

However, since the transmission path of light in human tissue is affected by the difference in the tissue structure of the measurement site and the thickness of the individual fat layer, the optimal distance between the light source and the photoelectric receiver is also affected.

For the relatively fixed design of light source and photoelectric receiver, the distance between each other is fixed and non-adjustable, the accuracy of the blood oxygen saturation data calculated by the subsequent circuit based on the data measured by the photoelectric receiver is not high, especially if the individual differences are particularly large Measurement object, may measure wrong data

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