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Wide-dynamic range pulse blood oxygen measurement system

A wide dynamic range, pulse oximetry technology, applied in diagnostic recording/measurement, medical science, sensors, etc., can solve problems such as unable to amplify AC components, fail to achieve expectations, and affect effective measurement of blood oxygen saturation, so as to improve the reliability Noise ratio, increasing dynamic range, and improving the effect of photoelectric signal intensity

Active Publication Date: 2014-03-12
INST OF BIOMEDICAL ENG CHINESE ACAD OF MEDICAL SCI
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AI Technical Summary

Problems solved by technology

[0016] The disadvantage of the above technical solution is: since the DC component in the signal is much larger than the AC component, in order to avoid saturation distortion, it is usually necessary to limit the amplification factor of the pre-signal amplifier circuit, so it is impossible to do enough for the AC component. enlarge
However, due to amplifier saturation and cut-off limitations, expectations cannot be achieved, which directly affects the effective measurement of blood oxygen saturation, and cannot guarantee the accuracy of blood oxygen saturation values.

Method used

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Embodiment Construction

[0026] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] A wide dynamic range pulse oximetry system such as figure 2 As shown, it includes a double-beam light-emitting unit, a pre-stage detection amplifier circuit, a DC elimination circuit, a buffer amplifier unit, a central processing unit module, and an output module. , the DC elimination circuit, the buffer amplifier unit and the output module are connected, and the pre-stage detection amplifier circuit, the DC elimination circuit, and the buffer amplifier unit are connected in sequence. The central processor module controls the light emission of the double-beam light-emitting unit, the central processor module samples the output signal of the pre-stage detection amplifier circuit and the output signal of the buffer amplifier circuit, and outputs the analyzed DC component to the DC elimination circuit The DC elimination circuit eliminates...

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Abstract

The invention relates to a wide-dynamic range pulse blood oxygen measurement system, which is mainly technically characterized by comprising a double-beam light-emitting unit, a pre-detection amplification circuit, a direct current elimination circuit, a buffer amplification unit, a central processor module and an output module, wherein the central processor module is connected with the double-beam light-emitting unit, the pre-detection amplification circuit, the direct current elimination circuit, the buffer amplification unit and the output module respectively; the pre-detection amplification circuit, the direct current elimination circuit and the buffer amplification unit are sequentially connected. The system is reasonable in design; two paths of light transmitted through the tail ends of tissues are added to the digital feedback direct current elimination circuit after being sampled, measured and pre-amplified, so that the intensity of photoelectric signals is improved, direct current components in the signals are reduced in a digital feedback way to realize the synchronous amplification of double-beam signals in a wider range and increase the signal to noise ratio, and the dynamic range of signal detection is widened.

Description

technical field [0001] The invention belongs to the technical field of physiological index detection, in particular to a pulse oximetry system with a wide dynamic range. Background technique [0002] The detection of pulse oximetry is a routine clinical detection index, which is widely used in ICU, CCU and other intensive care units, general wards and monitoring of surgical procedures, and can also be widely used in animal experiments to detect blood oxygen saturation. Pulse oximetry reflects the proportion of oxygenated hemoglobin in the body's blood, which can objectively reflect the body's blood oxygen status. The detection of pulse oximetry usually uses spectrophotometry, which includes transmitted light and reflected light methods, which is based on the Lambert-Beer law, using the light absorption coefficient of reduced hemoglobin and oxyhemoglobin difference to proceed. The Lambert-Beer law is: [0003] I=I 0 e - εCd (1) [0004] Among them, I is the transmitted ...

Claims

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Application Information

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IPC IPC(8): A61B5/1455
Inventor 徐圣普冯莉谢小波崔红岩徐晗辉
Owner INST OF BIOMEDICAL ENG CHINESE ACAD OF MEDICAL SCI
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