CN101455567A - Anti-interference blood oxygen measuring device and blood oxygen probe - Google Patents
Anti-interference blood oxygen measuring device and blood oxygen probe Download PDFInfo
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- CN101455567A CN101455567A CNA2007101251312A CN200710125131A CN101455567A CN 101455567 A CN101455567 A CN 101455567A CN A2007101251312 A CNA2007101251312 A CN A2007101251312A CN 200710125131 A CN200710125131 A CN 200710125131A CN 101455567 A CN101455567 A CN 101455567A
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Abstract
The present invention discloses a blood oxygen measuring device which prevents interference, which comprises a blood oxygen probe and an information processing module. The blood oxygen probe comprises a radiating device which is used for radiating at least two lights with different wavelengths, a photosensitive element which is used for receiving the optical signal carrying the blood oxygen saturation information of tested tissue and switching to an analog electric signal, and an A/D converting circuit which is used for converting the analog electric signal to the digital signal. The input end of A/D converting circuit is coupled with the output end of the photosensitive element. The output end of A/D converting circuit is coupled to the input end of information processing module through a signal transmission line. The invention also discloses the blood oxygen probe adopted in the blood oxygen measuring device. The blood oxygen measuring device firstly converts the analog detecting signal to digital signal and then outputs and processes through adding an A/D converting circuit in the blood oxygen probe, thereby effectively reducing the transmission distance of analog signal which is easily interfered by outside and reinforcing the interference resistance of the blood oxygen measuring device.
Description
[technical field]
The present invention relates to device that blood oxygen information is measured, be specifically related to a kind of jamming-proof blood oxygen measuring device and blood oxygen probe.
[background technology]
At present, the basic structure of oxygen saturation measurement device comprises blood oxygen probe and signal processing apparatus both at home and abroad, and blood oxygen probe is one and adopts light emitting diode and light-sensitive element to form pick off.The effect of light-sensitive element is that the optical signal that has blood oxygen saturation information by the tested tissue end is converted to analog electrical signal and output, treatedly will obtain digital quantity behind the analog signal digital, the blood oxygen saturation that adopts certain signal processing algorithm to calculate then.Existing oxygen saturation measurement device is earlier by blood oxygen probe output analog electrical signal, is sent to after the signal processing apparatus by signal transmission line, is converted to digital electric signal again and handles.Because the blood oxygen signal that light-sensitive element can detect is fainter, so this scheme very easily is subjected to various external interference influences in the process of signal transmission.
[summary of the invention]
Main purpose of the present invention solves the problems of the prior art exactly, and a kind of blood oxygen measuring device that can effectively prevent external interference is provided.
Another object of the present invention is that a kind of blood oxygen probe that can effectively prevent external interference is provided.
For achieving the above object, the invention provides a kind of jamming-proof blood oxygen measuring device, comprise blood oxygen probe and message processing module, described blood oxygen probe comprises the luminescent device that is used to launch at least two kinds of wavelength light, be used to receive optical signal that has tested tissue blood oxygen saturation information and the light-sensitive element that is converted to analog electrical signal, described blood oxygen probe also comprises the A/D change-over circuit that is used for described analog electrical signal is converted to digital signal, the input of described A/D change-over circuit and the coupling of the outfan of described light-sensitive element, the outfan of described A/D change-over circuit is coupled to the input of described message processing module by signal transmission line.
Described A/D change-over circuit is preferably the A/D sampling device with gain amplification.Described message processing module comprises:
Data processing unit is used to receive the data after A/D changes, and obtains pulse wave and blood oxygen saturation after handling, calculating;
Logic control element is used for sending control signal corresponding according to the data that described data processing unit provides;
The photoelectricity drive circuit is used to receive the control signal of described logic control element, exports the described luminescent device of current drives of different amplitudes, to guarantee the optical signal of its output certain amplitude;
Memory element is used to store various measurement data, intermediate data and result data; And
Communication unit is used for carrying out data interaction with described blood oxygen measuring device outside.
For achieving the above object, the present invention also provides a kind of blood oxygen probe, comprise the luminescent device that is used to launch at least two kinds of wavelength light, be used to receive optical signal that has tested tissue blood oxygen saturation information and the light-sensitive element that is converted to analog electrical signal, also comprise the A/D change-over circuit that is used for described analog electrical signal is converted to digital signal, the input of described A/D change-over circuit and the coupling of the outfan of described light-sensitive element, the outfan of described A/D change-over circuit is used to be coupled to signal transmission line.
The present invention's beneficial effect compared with prior art is:
The present invention has increased the A/D change-over circuit in blood oxygen probe, convert the optical mode analog signal that detects to digital signal earlier and transmit, has effectively reduced the transmission range that is subjected to the analogue signal of external interference easily.Because the information that detects is to deliver to signal processing module with the form of digital signal by signal transmission line, even the distance of signal transmission is longer, also can prevent the harmful effect of various external noises effectively, therefore strengthen the interference free performance of blood oxygen measuring device widely.
The preferred for example high-precision A/D sampling A of A/D sampling device that adopts with gain amplification, amplifying circuit can not need independently be set in blood oxygen probe, reduced the circuit and the controlling unit of this part,, improved certainty of measurement so can further reduce noise source.
[description of drawings]
Fig. 1 is the structural representation of the blood oxygen measuring device of the embodiment of the invention.
[specific embodiment]
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
At first introduce the principle of Oximetry.When the beating of arterial blood in the tissue end that utilizes pulse wave to cause, because HbO2 Oxyhemoglobin is different in the optical characteristics of red-light spectrum district and ultrared with reduced hemoglobin, thereby the influence finger is to the light transmission of HONGGUANG and infrared light, when the HONGGUANG of certain light intensity and infrared light are added to finger when going up, by detecting the transmitted light intensity of two kinds of wavelength respectively, just can calculate the content of HbO2 Oxyhemoglobin to the ratio meter of two kinds of light optical density variable quantities by finger, thus the blood oxygen saturation of calculating.
Measure blood oxygen saturation spectrophotography commonly used, comprise light transmission and reflective optical methods again, it utilizes the difference of the absorption coefficient of light of reduced hemoglobin and HbO2 Oxyhemoglobin to carry out all based on lambert-Beer law and light scattering theory.Lambert-Beer law can be shown:
I＝I
0e
-εcd
Wherein: I: transmitted light intensity;
I
0: incident intensity;
C: be subjected to the stimulative substance solution concentration;
D: solution is subjected to optical path length;
ε: the light absorption constant of material;
Definition according to blood oxygen saturation;
SaO
2＝HbO
2/(Hb+HbO
2)＝C
1/(C
1+C
2)
Wherein, C
1Be HbO
2Concentration, C
2Be Hb concentration;
Studies show that detecting sphygmus and blood oxygen saturation SpO
2Be approximately SaO
2
Spo
2＝f(R)
Wherein, R is corresponding one by one with blood oxygen saturation, i.e. the variation of the two-way light that pulse blood oxygen can be by seeing through tissue is tried to achieve, and the computing formula of R value is:
Wherein, Red
ACBe the flutter component of HONGGUANG, Red
DCBe the DC component of HONGGUANG, Ir
ACBe the flutter component of infrared light, Ir
DCIt is the DC component of infrared light.
According to above-mentioned theory, as long as obtain the relevant detection parameter, just can be by calculating the human pulse blood oxygen saturation.
Please refer to Fig. 1, the blood oxygen measuring device of present embodiment comprises blood oxygen probe and message processing module, and the outfan of blood oxygen probe is connected by signal transmission line with the input of message processing module.
Blood oxygen probe comprises pick off and the A/D change-over circuit of being made up of luminescent device and light-sensitive element again, light-sensitive element preferably adopts light cell, its outfan is connected with the input of A/D change-over circuit, the outfan of A/D change-over circuit is connected with an end of signal transmission line, and the other end of signal transmission line is connected with message processing module.Wherein, luminescent device adopts light emitting diode, it can be a kind of light emitting diode that can send two kinds of wavelength or two or more wavelength light, also can be two or more a plurality of light emitting diodes that can send different wavelengths of light, send by light emitting diode and survey the required special wavelength light of blood oxygen.Light-sensitive element receives and to have passed through the carrier optical signal that tested tissue has blood oxygen saturation information, delivers to the A/D change-over circuit after being converted into the signal of telecommunication.In a kind of scheme, also be provided with amplifying circuit between described light-sensitive element and described A/D change-over circuit, the signal to light-sensitive element output before the A/D conversion amplifies.In the preferred scheme, the A/D change-over circuit adopts high-precision A/D sampling A with gain amplification, can save so independent amplifying circuit is set in blood oxygen probe, owing to reduced the executive circuit and the controlling unit of this part, can further reduce noise source, improve certainty of measurement.
Message processing module comprises data processing unit, logic control element, photoelectricity drive circuit, memory element and communication unit.Wherein, the other end of the input termination signal transmission line of data processing unit, the outfan of data processing unit joins with logic control element, memory element and communication unit respectively.The control output end of logic control element connects the input of photoelectricity drive circuit, and the outfan of photoelectricity drive circuit is coupled to luminescent device by control signal wire.Communication unit comprises serial data interface, and it is responsible for and outside information interaction.Memory element comprises flash memory (Flash) and RAM (RandomAccess Memory, random access storage device) again, is used for the access of various data messages.
When carrying out Oximetry, lumination of light emitting diode in the blood oxygen probe, optical signal is through measurand such as tissue end, and the light-sensitive element collection has the optical signal of blood oxygen saturation information, after converting thereof into current signal, after current/voltage-converted, export the A/D change-over circuit to.The A/D change-over circuit is converted to digital signal level with the analog voltage signal that it received.The digital signal of A/D change-over circuit output is delivered to message processing module by the transmission of signal transmission line, and the data processing unit in the message processing module receives this digital signal, carries out a series of processing, calculating, obtains pulse wave and blood oxygen saturation information.In this process, can utilize memory element to preserve and read various measurement data, intermediate data and result data.The data that logic control element then provides according to data processing unit are sent different control signals, and the electric current that control photoelectricity drive circuit is exported different amplitudes removes the driven for emitting lights diode, adjusts its output, guarantees that optical signal has certain amplitude.During work, message processing module can also export measurement data to external equipment by serial data interface, or receives and by the information of outside input such as user order etc. to be set.
Among the present invention, blood oxygen probe has increased the A/D change-over circuit, the analog detection signal that pick off provides is converted into digital signal earlier and exports, signal transmits between blood oxygen probe and message processing module with the digital form of strong interference immunity, thereby can reduce the influence of external interference greatly, improve the accuracy of Oximetry effectively signal.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. jamming-proof blood oxygen measuring device, comprise blood oxygen probe and message processing module, described blood oxygen probe comprises the luminescent device that is used to launch at least two kinds of wavelength light, be used to receive optical signal that has tested tissue blood oxygen saturation information and the light-sensitive element that is converted to analog electrical signal, it is characterized in that: described blood oxygen probe also comprises the A/D change-over circuit that is used for described analog electrical signal is converted to digital signal, the input of described A/D change-over circuit and the coupling of the outfan of described light-sensitive element, the outfan of described A/D change-over circuit is coupled to the input of described message processing module by signal transmission line.
2. blood oxygen measuring device as claimed in claim 1 is characterized in that: described A/D change-over circuit is the A/D sampling device with gain amplification.
3. blood oxygen measuring device as claimed in claim 1 is characterized in that: described blood oxygen probe also comprises the amplifying circuit that is connected between described light-sensitive element and the described A/D change-over circuit.
4. blood oxygen measuring device as claimed in claim 1 is characterized in that: described luminescent device is for sending light emitting diode or two light emitting diodes that can send different wavelengths of light of two kinds of wavelength light.
5. as each described blood oxygen measuring device in the claim 1 to 4, it is characterized in that: described message processing module comprises:
Data processing unit is used to receive the data after A/D changes, and obtains pulse wave and blood oxygen saturation after handling, calculating;
Logic control element is used for sending control signal corresponding according to the data that described data processing unit provides;
The photoelectricity drive circuit is used to receive the control signal of described logic control element, exports the described luminescent device of current drives of different amplitudes, to guarantee the optical signal of its output certain amplitude;
Memory element is used to store various measurement data, intermediate data and result data; And
Communication unit is used for carrying out data interaction with described blood oxygen measuring device outside.
6. blood oxygen probe, comprise the luminescent device that is used to launch at least two kinds of wavelength light, be used to receive optical signal that has tested tissue blood oxygen saturation information and the light-sensitive element that is converted to analog electrical signal, it is characterized in that: also comprise the A/D change-over circuit that is used for described analog electrical signal is converted to digital signal, the input of described A/D change-over circuit and the coupling of the outfan of described light-sensitive element, the outfan of described A/D change-over circuit is used to be coupled to signal transmission line.
7. blood oxygen probe as claimed in claim 6 is characterized in that, described A/D change-over circuit is the A/D sampling device with gain amplification.
8. blood oxygen probe as claimed in claim 6 is characterized in that, described blood oxygen probe also comprises the amplifying circuit that is connected between described light-sensitive element and the described A/D change-over circuit.
9. as any described blood oxygen probe in the claim 6 to 8, it is characterized in that described luminescent device is for sending light emitting diode or two light emitting diodes that can send different wavelengths of light of two kinds of wavelength light.
10. blood oxygen probe as claimed in claim 9 is characterized in that, described light-sensitive element is a light cell.
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| CNA2007101251312A CN101455567A (en) | 2007-12-14 | 2007-12-14 | Anti-interference blood oxygen measuring device and blood oxygen probe |
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| CNA2007101251312A CN101455567A (en) | 2007-12-14 | 2007-12-14 | Anti-interference blood oxygen measuring device and blood oxygen probe |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102293653A (en) * | 2010-06-28 | 2011-12-28 | 深圳市国基科技有限公司 | Coupling inspection head and manufacturing method thereof |
| CN103027691A (en) * | 2012-12-24 | 2013-04-10 | 深圳迪美泰数字医学技术有限公司 | Digital measuring device and digital measuring method for physiological and biochemical parameters |
| CN103547211A (en) * | 2011-05-20 | 2014-01-29 | 株式会社村田制作所 | Optical sensor device |
| CN104459816A (en) * | 2014-12-04 | 2015-03-25 | 上海理工大学 | Device and method for increasing detection distance of reflection type optocoupler |
| CN105943057A (en) * | 2016-06-01 | 2016-09-21 | 成都云卫康医疗科技有限公司 | Wireless digital blood oxygen probe |
| CN106598107A (en) * | 2016-12-29 | 2017-04-26 | 杭州暖芯迦电子科技有限公司 | Automatic adjustment photoelectric sensor signal circuit based on feedback system |
| CN108245156A (en) * | 2017-11-29 | 2018-07-06 | 重庆金山医疗器械有限公司 | A kind of method, apparatus and equipment for monitoring the impedance of stomach esophagus and pH |
| WO2020258022A1 (en) * | 2019-06-25 | 2020-12-30 | 深圳市蓝瑞格生物医疗科技有限公司 | Method and system for improving measurement accuracy of measurement system |
| CN112858196A (en) * | 2020-10-20 | 2021-05-28 | 重庆大学 | Method for measuring three-wavelength venous blood oxygen concentration |
| CN113171088A (en) * | 2021-04-26 | 2021-07-27 | 徐州市永康电子科技有限公司 | Blood oxygen parameter detection system based on NB-IOT communication |
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2007
- 2007-12-14 CN CNA2007101251312A patent/CN101455567A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102293653B (en) * | 2010-06-28 | 2013-05-01 | 深圳市国基科技有限公司 | Coupling inspection head and manufacturing method thereof |
| CN102293653A (en) * | 2010-06-28 | 2011-12-28 | 深圳市国基科技有限公司 | Coupling inspection head and manufacturing method thereof |
| US9360365B2 (en) | 2011-05-20 | 2016-06-07 | Murata Manufacturing Co., Ltd. | Optical sensor device for detecting a pulse of a living body |
| CN103547211A (en) * | 2011-05-20 | 2014-01-29 | 株式会社村田制作所 | Optical sensor device |
| US9983053B2 (en) | 2011-05-20 | 2018-05-29 | Murata Manufacturing Co., Ltd. | Optical sensor device |
| CN103027691B (en) * | 2012-12-24 | 2016-01-13 | 深圳迪美泰数字医学技术有限公司 | Digital Physiological And Biochemical Parameters measuring device and measuring method |
| CN103027691A (en) * | 2012-12-24 | 2013-04-10 | 深圳迪美泰数字医学技术有限公司 | Digital measuring device and digital measuring method for physiological and biochemical parameters |
| CN104459816A (en) * | 2014-12-04 | 2015-03-25 | 上海理工大学 | Device and method for increasing detection distance of reflection type optocoupler |
| CN105943057A (en) * | 2016-06-01 | 2016-09-21 | 成都云卫康医疗科技有限公司 | Wireless digital blood oxygen probe |
| CN106598107A (en) * | 2016-12-29 | 2017-04-26 | 杭州暖芯迦电子科技有限公司 | Automatic adjustment photoelectric sensor signal circuit based on feedback system |
| CN106598107B (en) * | 2016-12-29 | 2020-07-24 | 杭州暖芯迦电子科技有限公司 | But automatically regulated photoelectric sensor signal circuit based on feedback system |
| CN108245156A (en) * | 2017-11-29 | 2018-07-06 | 重庆金山医疗器械有限公司 | A kind of method, apparatus and equipment for monitoring the impedance of stomach esophagus and pH |
| WO2020258022A1 (en) * | 2019-06-25 | 2020-12-30 | 深圳市蓝瑞格生物医疗科技有限公司 | Method and system for improving measurement accuracy of measurement system |
| CN112858196A (en) * | 2020-10-20 | 2021-05-28 | 重庆大学 | Method for measuring three-wavelength venous blood oxygen concentration |
| CN113171088A (en) * | 2021-04-26 | 2021-07-27 | 徐州市永康电子科技有限公司 | Blood oxygen parameter detection system based on NB-IOT communication |
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Application publication date: 20090617 |