CN104622479A - Noninvasive blood oxygen saturation detector - Google Patents
Noninvasive blood oxygen saturation detector Download PDFInfo
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- CN104622479A CN104622479A CN201410750773.1A CN201410750773A CN104622479A CN 104622479 A CN104622479 A CN 104622479A CN 201410750773 A CN201410750773 A CN 201410750773A CN 104622479 A CN104622479 A CN 104622479A
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- blood oxygen
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
- A61B5/14551—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
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Abstract
The invention relates to the technical field of modern electronic technologies and medical instruments, in particular to a noninvasive blood oxygen saturation detector. The noninvasive blood oxygen saturation detector is composed of a light source drive circuit, a sequential control circuit, a single chip microcomputer, an I/V conversion circuit, a signal filtering circuit, a gain control circuit and LEDs. A red light LED and an infrared light LED are connected between the light source drive circuit and the I/V conversion circuit in parallel. The I/V conversion circuit is connected with the signal filtering circuit, the gain control circuit, the single chip microcomputer and the sequential control circuit in sequence. The other end of the sequential control circuit is connected with the light source drive circuit. The noninvasive blood oxygen saturation detector is stable in structure, small in power consumption and low in cost and provides continuous and effective monitoring information for clinical measurements, thereby being wide in application prospect.
Description
Technical field
The present invention relates to modern electronic technology technical field of medical equipment, be specifically related to a kind of noinvasive blood oxygen saturation detector.
Background technology
Oxygen is the basis maintaining human tissue cell's normal function, vital movement.The histiocytic power conversion of the overwhelming majority of human body is all complete in the presence of oxygen.So the metabolism of oxygen and transportation, indirectly can obtain the metabolism state of cell, have important meaning in the research field of life sciences in real-time monitoring tissue.Understand metabolism and the transportation of oxygen in tissue, namely grasp the blood O_2 transport metabolic condition in arteries, people adopt two kinds of effectively practical methods usually.First method: directly gather human body artery blood sample and carry out blood gas analysis.It comprises the pH of blood, PO
2, PCO
2measured value, also comprise the parameters such as the blood oxygen saturation obtained as calculated, but this method be have wound measure, and to blood specimen collection have some restriction requirements, can not as the method for real-time monitoring.Second method: utilize noinvasive Oximetry technology to detect arterial oxygen saturation.It utilizes near infrared light to have unique optical absorption spectra feature when hemoglobin oxygenate state is different in the tissue to detect and organize blood oxygen saturation.
Traditional noinvasive BOLD contrast device crosses in blood tissues by photoelectric testing sensor acquisition of transmission light intensity signal of pulsing, and sends into single-chip microcomputer and carry out date processing and draw oximetry value after fixed gain amplification and filtering.
Summary of the invention
The present invention is intended to propose a kind ofly to coordinate controlled digital regulation resistance to realize the noinvasive blood oxygen saturation tester of Gain Automatic adjustment based on single-chip microcomputer.
Technical program of the present invention lies in:
A kind of noinvasive blood oxygen saturation detector, is made up of light source driving circuit, sequential control circuit, single-chip microcomputer, I/V change-over circuit, signal filter circuit, gain control circuit and LED; Wherein, red-light LED and infrared light LED is connected with side by side between light source driving circuit and I/V change-over circuit, I/V change-over circuit is connected with sequential control circuit successively with signal filter circuit, gain control circuit, single-chip microcomputer, and the sequential control circuit other end connects light source driving circuit.
Preferably, AD795 model I/V conversion chip selected by described I/V change-over circuit, and its feedback resistance size is 20MW, and its two ends 10uF small capacitances in parallel forms integrating circuit.
Preferably, described signal filter circuit adopts Butterworth LPF, and its cut-off frequency is 23Hz.
Or preferably, described gain control circuit is made up of amplifying circuit in proportion, at the backward end of amplifier and the input digital regulation resistance X9241 by bus marco, built-in four potentiometers of every sheet X9241, each potentiometer is formed by 64 resistant series.
Or 8051F020 model single-chip microcomputer selected by preferably, described single-chip microcomputer.
Technique effect of the present invention is:
The noinvasive blood oxygen saturation detector that the present invention proposes is based on singlechip chip, effectively utilize hemoglobin to the absorption characteristic of HONGGUANG and infrared light, and solve the impact of individual variation on measuring-signal by automatic growth control, achieve human body noinvasive, real time monitoring function.This system structure is stable, power consumption is little, cost is low, for clinical measurement provides the monitoring information of continuous effective, is applicable to clinical measurement and research, has broad application prospects.
Accompanying drawing explanation
Fig. 1 is the system connection layout of a kind of noinvasive blood oxygen saturation of the present invention detector.
Detailed description of the invention
A kind of noinvasive blood oxygen saturation detector, is made up of light source driving circuit, sequential control circuit, single-chip microcomputer, I/V change-over circuit, signal filter circuit, gain control circuit and LED; Wherein, red-light LED and infrared light LED is connected with side by side between light source driving circuit and I/V change-over circuit, I/V change-over circuit is connected with sequential control circuit successively with signal filter circuit, gain control circuit, single-chip microcomputer, and the sequential control circuit other end connects light source driving circuit.
Wherein, AD795 model I/V conversion chip selected by I/V change-over circuit, and its feedback resistance size is 20MW, and its two ends 10uF small capacitances in parallel forms integrating circuit, can reduce input current noise further, be photo-signal is converted to the voltage signal be directly proportional to transmitted light intensity.The blood oxygen signal sent by AD795, usually with High-frequency Interference in various degree, needs to carry out low-pass filtering and leaches the high-frequency noise produced in testing process further, and signal filter circuit adopts Butterworth LPF, and its cut-off frequency is 23Hz.Signal, by after this wave filter, can improve signal to noise ratio, restraint speckle effectively.Signal after filtering after, enter gain control module, overcoming blood oxygen signal that individual variation causes only by have impact on the shortcoming of certainty of measurement after fixing amplification, achieving the object of Gain Automatic adjustment.Gain control circuit is made up of amplifying circuit in proportion, and at the backward end of amplifier and the input digital regulation resistance X9241 by bus marco, built-in four potentiometers of every sheet X9241, each potentiometer is formed by 64 resistant series.8051F020 model single-chip microcomputer selected by single-chip microcomputer.
Work process of the present invention is: the timing control signal that single-chip microcomputer produces, and driven red-light LED infrared light LED time-division illumination is pointed, and its signal is carried out date processing by sending into single-chip microcomputer after amplification filtering process and calculates blood oxygen saturation.
Claims (5)
1. a noinvasive blood oxygen saturation detector, is characterized in that: be made up of light source driving circuit, sequential control circuit, single-chip microcomputer, I/V change-over circuit, signal filter circuit, gain control circuit and LED; Wherein, red-light LED and infrared light LED is connected with side by side between light source driving circuit and I/V change-over circuit, I/V change-over circuit is connected with sequential control circuit successively with signal filter circuit, gain control circuit, single-chip microcomputer, and the sequential control circuit other end connects light source driving circuit.
2. as claim 1 noinvasive blood oxygen saturation detector, it is characterized in that: described I/V change-over circuit profound English AD795 model I/V conversion chip, its feedback resistance size is 20MW, and its two ends 10uF small capacitances in parallel forms integrating circuit.
3. as claim 1 noinvasive blood oxygen saturation detector, it is characterized in that: described signal filter circuit adopts Butterworth LPF, and its cut-off frequency is 23Hz.
4. as claim 1 noinvasive blood oxygen saturation detector, it is characterized in that: described gain control circuit is made up of amplifying circuit in proportion, at the backward end of amplifier and the input digital regulation resistance X9241 by bus marco, built-in four potentiometers of every sheet X9241, each potentiometer is formed by 64 resistant series.
5., as claim 1 noinvasive blood oxygen saturation detector, it is characterized in that: 8051F020 model single-chip microcomputer selected by described single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410750773.1A CN104622479A (en) | 2014-12-10 | 2014-12-10 | Noninvasive blood oxygen saturation detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410750773.1A CN104622479A (en) | 2014-12-10 | 2014-12-10 | Noninvasive blood oxygen saturation detector |
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| Publication Number | Publication Date |
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| CN104622479A true CN104622479A (en) | 2015-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410750773.1A Pending CN104622479A (en) | 2014-12-10 | 2014-12-10 | Noninvasive blood oxygen saturation detector |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106037716A (en) * | 2016-06-24 | 2016-10-26 | 张兆航 | Multifunctional anesthesia monitor |
| CN107233089A (en) * | 2016-03-28 | 2017-10-10 | 富士施乐株式会社 | Biological information detecting device |
| CN109077735A (en) * | 2017-06-14 | 2018-12-25 | 亚德诺半导体集团 | System and method for measuring the oxygen in blood stream of patients |
| CN109171764A (en) * | 2018-10-24 | 2019-01-11 | 重庆科技学院 | A kind of SCM Based blood oxygen detection method |
| CN111248889A (en) * | 2020-01-19 | 2020-06-09 | 浙江大学 | Pulse wave measuring device and method based on LED diode and LED display matrix |
-
2014
- 2014-12-10 CN CN201410750773.1A patent/CN104622479A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107233089A (en) * | 2016-03-28 | 2017-10-10 | 富士施乐株式会社 | Biological information detecting device |
| CN107233089B (en) * | 2016-03-28 | 2021-05-28 | 富士施乐株式会社 | Living body information measuring device |
| CN106037716A (en) * | 2016-06-24 | 2016-10-26 | 张兆航 | Multifunctional anesthesia monitor |
| CN109077735A (en) * | 2017-06-14 | 2018-12-25 | 亚德诺半导体集团 | System and method for measuring the oxygen in blood stream of patients |
| CN109077735B (en) * | 2017-06-14 | 2022-04-08 | 亚德诺半导体国际无限责任公司 | System and method for measuring oxygen in a patient's bloodstream |
| CN109171764A (en) * | 2018-10-24 | 2019-01-11 | 重庆科技学院 | A kind of SCM Based blood oxygen detection method |
| CN111248889A (en) * | 2020-01-19 | 2020-06-09 | 浙江大学 | Pulse wave measuring device and method based on LED diode and LED display matrix |
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Application publication date: 20150520 |