A blood oxygen detection method based on single chip microcomputer
A technology of blood oxygen detection and detection method, which is applied in the field of medical electronics, can solve the problems of signal distortion, invasive measurement cannot be carried out continuously, and the surrounding light is too strong, etc., and achieve good stability.
Inactive Publication Date: 2019-01-11
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
[0005] 1. The background light is relatively strong, and the surrounding light is too strong;
[0006] 2. The user's test site (finger) shakes and introduces interference to cause signal distortion
[0007] 3. Large detection errors caused by age, skin color, gender, and personal constitution
In the past, most of the measurement methods for blood oxygen saturation were invasive measurements, but invasive measurements could not be performed continuously, and the wound was prone to infection. Therefore, a non-invasive blood oxygen saturation measurement instrument based on single-chip microcomputer as the core control was developed to achieve non-invasive , The method of continuous measurement of blood oxygen saturation is of great significance
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[0046] The present invention will be described further in conjunction with accompanying drawing now.
[0047] The overall principle of the present invention is as figure 1 As shown, specifically, the probe driving circuit is first operated, and then the optical signal is collected by the sensor and converted into an electrical signal for subsequent processing. Then the current signal undergoes a series of processing to convert the current into a voltage signal, and then pass through a high-pass filter to remove the DC signal, and finally pass through a low-pass filter to collect corresponding data to calculate the blood oxygen saturation of the tester.
[0048] The first is signal acquisition. The single-chip microcomputer used in this embodiment is STM89C51 single-chip microcomputer, and the 51 single-chip microcomputer is used to transmit the PWM program to control the light-emitting diodes of the blood oxygen probe to work in turn in a certain period. The PWM program has s...
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Abstract
The invention relates to the technical field of medical electronics, and particularly discloses a blood oxygen detection method based on a single chip microcomputer. The detection method comprises thefollowing steps: 1. collecting blood oxygen signal: outputting PWM signal by the single chip microcomputer, amplifying and processing the PWM signal outputted by the single chip microcomputer througha driving circuit, and transmitting the signal to the blood oxygen probe to control the blood oxygen probe at the blood oxygen probe to collect blood oxygen signal to obtain blood oxygen photocurrentsignal; 2, pretreating the blood oxygen signals: converting the blood oxygen photocurrent signal adopt in the step 1 into a voltage signal to be processed through a current / voltage conversion circuit; 3, filtering the voltage; 4, processing the blood oxygen signal. The invention realizes comprehensive and fast filtering of noise signals of various frequencies in pulse wave signals, and has good stability, accuracy and sensitivity.
Description
technical field [0001] The invention relates to the technical field of medical electronics, in particular to a method for detecting blood oxygen based on a single-chip microcomputer. Background technique [0002] According to statistics, as of the end of 2017, the number of patients with various cardiovascular diseases in my country has reached 280 million, and the mortality rate of cardiovascular diseases is as high as 40%. . The lack of oxygen in vital organs such as the heart, brain, and kidneys caused by low oxygen content in the blood leads to various cardiovascular diseases and seriously endangers human health. Therefore, whether it is in daily life or clinical treatment, it is particularly important to detect the oxygen content in the blood. [0003] At present, the blood oxygen saturation in the blood oxygen signal mainly uses an oximeter for non-invasive optical detection. There are many domestic medical device companies and manufacturers engaged in the research o...
Claims
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Login to View More IPC IPC(8): A61B5/1455
CPCA61B5/14551A61B5/7203A61B5/725
Inventor 廖晓玲徐文峰徐紫宸周野刘润
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY