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An anti-environmental light interference blood oxygen measuring device and method thereof

A measurement device and ambient light technology, applied in diagnostic recording/measurement, medical science, sensors, etc., can solve problems such as low signal-to-noise ratio, measurement failure, and large error of blood oxygen measurement equipment, so as to improve the accuracy of measurement, The effect of avoiding errors and using a wide range

Active Publication Date: 2015-10-21
EDAN INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is easy to saturate the current-voltage conversion module, and it is inevitable to process some optical interference signals into effective signals, which will lead to large errors in blood oxygen measurement equipment, low signal-to-noise ratio, and even measurement failure.

Method used

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  • An anti-environmental light interference blood oxygen measuring device and method thereof
  • An anti-environmental light interference blood oxygen measuring device and method thereof
  • An anti-environmental light interference blood oxygen measuring device and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] like Figure 5 As shown, the compensation circuit includes three unit circuits of a digital-to-analog conversion circuit (DAC) 301, a signal conditioning circuit 302, and a current injection circuit 304. The current-voltage conversion module 104 is a relatively general current-voltage conversion circuit, and the signal conditioning module 105 performs Programmable amplification to meet the needs of different signal strengths, and direct analog-to-digital conversion of signals. In this embodiment, the signal conditioning module 105 is not specially designed, and the signal is simply filtered by C5 in the figure. This solution is aimed at a single-ended current conversion circuit. The so-called single-ended current conversion means that the input of the current-voltage conversion module 104 is single-ended. The compensation current formula is: .

[0110] A digital-to-analog conversion circuit (DAC) 301, outputting an adjustable voltage. The reference source and numbe...

Embodiment 2

[0124] like Image 6 As shown, the compensation circuit includes four unit circuits of a digital-to-analog conversion circuit (DAC) 301 , a signal conditioning circuit 302 , a signal inversion circuit 303 , and a current injection circuit 304 . Consistent with the embodiment, the current-to-voltage conversion module 104 is a relatively general current-to-voltage conversion circuit, and the 106 performs program-controlled amplification on the signal to meet the requirements of different signal strengths, and directly performs analog-to-digital conversion on the signal. In this embodiment, no signal conditioning circuit is specially designed, and only the signals are simply filtered by C5 and C8 in the figure. This embodiment is aimed at a double-terminal current-type conversion circuit, the so-called double-terminal current-type conversion means that the input of 104 is double-terminal.

[0125] The signal inverting circuit 303 inverts the signal processed in 302 around the co...

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Abstract

The invention discloses an ambient-light-interference-resistant blood oxygen measuring device. The device is provided with a light emitting module, a light receiving module, a current-to-voltage conversion module, an analog-to-digital conversion module and a signal processing module, and is further provided with a compensating module. The compensating module is arranged between the light receiving module and the current-to-voltage conversion module, is connected with the light receiving module, the current-to-voltage conversion module and the signal processing module respectively and is used for filtering interference light currents output by the light receiving module according to signals output by the signal processing module. Due to the fact that the compensating module is directly connected with the light receiving module, the interference light currents output by the light receiving module can be directly filtered, interference light current mixing is avoided from the source, and the signal to noise ratio of the measuring device is effectively improved. An ambient-light-interference-resistant blood oxygen measuring method corresponding to the ambient-light-interference-resistant blood oxygen measuring device also has the advantages.

Description

technical field [0001] The invention relates to a non-invasive blood oxygen measuring device, in particular to a blood oxygen measuring device and a measuring method thereof which are resistant to ambient light interference. Background technique [0002] Blood oxygen saturation is also called blood oxygen saturation. Blood oxygen saturation is an important parameter to measure the ability of human blood to carry oxygen. Through the measurement of blood oxygen saturation, we can know the blood oxygen content of patients in time, which has extremely important clinical value. [0003] Non-invasive blood oxygen measurement mainly uses photoelectric technology, and there are usually two methods: projection method and reflection method. Photoelectric technology emits a beam of light to a specific part of the human body, and the light is transmitted or reflected to the light receiving module. Different blood oxygen saturation and different pulse rates will lead to different photocu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/1455
Inventor 刘庆良
Owner EDAN INSTR