CN110477886A - The sensing node of blood oxygen and heart rate in wireless body area network - Google Patents
The sensing node of blood oxygen and heart rate in wireless body area network Download PDFInfo
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- CN110477886A CN110477886A CN201910864768.6A CN201910864768A CN110477886A CN 110477886 A CN110477886 A CN 110477886A CN 201910864768 A CN201910864768 A CN 201910864768A CN 110477886 A CN110477886 A CN 110477886A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 56
- 239000001301 oxygen Substances 0.000 title claims abstract description 56
- 239000008280 blood Substances 0.000 title claims abstract description 55
- 210000004369 blood Anatomy 0.000 title claims abstract description 55
- 239000000523 sample Substances 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 238000007493 shaping process Methods 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 230000036541 health Effects 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 6
- 230000032683 aging Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 208000017667 Chronic Disease Diseases 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000002560 therapeutic procedure Methods 0.000 description 2
- 208000019901 Anxiety disease Diseases 0.000 description 1
- 241000208340 Araliaceae Species 0.000 description 1
- 206010010264 Condition aggravated Diseases 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000005013 brain tissue Anatomy 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 210000003169 central nervous system Anatomy 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 238000009532 heart rate measurement Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000002496 oximetry Methods 0.000 description 1
- 230000001575 pathological effect Effects 0.000 description 1
- 230000035479 physiological effects, processes and functions Effects 0.000 description 1
- 230000035790 physiological processes and functions Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0002—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
- A61B5/0004—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network characterised by the type of physiological signal transmitted
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/0205—Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
-
- 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
Abstract
The sensing node of blood oxygen and heart rate in wireless body area network, is related to bio signal processing technique, for continuous, real-time quick detection and transmits wirelessly blood oxygen and heart rate value.Control module controls the transmitting light of probe source, and when detecting blood oxygen, the light of two kinds of wavelength of probe source alternate emission, when detecting heart rate, probe source emits the light of single wavelength;The light of probe source transmitting is transmitted through photodetector, the input terminal of the output end connection filter circuit of photodetector through tissue;When detecting blood oxygen, filter circuit exports blood oxygen signal to AD conversion module, when detecting heart rate, filter circuit exports heart rate signal to isolating amplifier circuit, isolating amplifier circuit, shaping circuit and counting module are sequentially connected, the output end of AD conversion module and the output end of counting module are all connected with the input terminal of computing module, and computing module, memory module and Wi-Fi module are sequentially connected.The present invention is suitable for measurement blood oxygen and heart rate.
Description
Technical field
The present invention relates to bio signal processing techniques.
Background technique
Oxygen is the necessary material of metabolism, is the basis of life entity existence, and especially brain tissue oxygen demand is high,
And it is especially sensitive to anoxic, short time anoxic is possible to cause the expendable damage of central nervous system.Therefore, to blood
Oxygen content, which carries out continuous, real-time quick detection, becomes a Xiang Yaoqiu of biology.Meanwhile heart rate is also the important ginseng of human body
Number, can detecte out body physiological state to the analysis of heart rate.Traditional blood drawing detection also results in certain pain to patient,
When being measured in real time particularly with the elderly and children, existing method is obviously infeasible.
Summary of the invention
The purpose of the invention is to continuous, real-time quick detection and blood oxygen and heart rate value are transmitted wirelessly, to provide
The sensing node of blood oxygen and heart rate in wireless body area network.
The sensing node of blood oxygen and heart rate in wireless body area network of the present invention, including detecting module, signal processing mould
Block and single-chip microcontroller;
Detecting module includes probe source 1 and photodetector 2, and signal processing module includes filter circuit 3, isolation amplification
Circuit 4 and shaping circuit 5, single-chip microcontroller include control module 6, AD conversion module 7, counting module 8, computing module 9, memory module
10 and Wi-Fi module 11;
Control module 6 controls the transmitting light of probe source 1, when detecting blood oxygen, 1 alternate emission two of probe source
The light of kind wavelength, when detecting heart rate, probe source 1 emits the light of single wavelength;
The light that probe source 1 emits is transmitted through photodetector 2, the output end connection of photodetector 2 through tissue
The input terminal of filter circuit 3;
When detecting blood oxygen, filter circuit 3 exports blood oxygen signal to AD conversion module 7, when detecting heart rate, filter circuit
3 export heart rate signal to isolating amplifier circuit 4, the input terminal of the output end connection shaping circuit 5 of isolating amplifier circuit 4, shaping
The input terminal of the output end connection count module 8 of circuit 5, the output end of AD conversion module 7 and the output end of counting module 8 connect
The input terminal of computing module 9 is connect, the blood oxygen levels of computing module 9 connect the input terminal of memory module 10 with heart rate value output end, deposit
The input terminal of the output end connection Wi-Fi module 11 of module 10 is stored up, Wi-Fi module 11 sends blood oxygen levels and the heart to external equipment 12
Rate value.
Preferably, two kinds of wavelength that probe source 1 emits light are respectively 660nm and 940nm.
Preferably, computing module 9 calculates blood oxygen levels according to blood oxygen signal, specifically:
Wherein, SpO2For blood oxygen levels, IAC1Amplitude, I for 660nm AC portionDC1For the amplitude of 660nm direct current component,
IAC2Amplitude, I for 940nm AC portionDC2For the amplitude of 940nm direct current component.
The blood oxygen saturation and heart rate of human body contain many important physiology and pathological information, especially with human body painstaking effort
The relevant information of guard system is physical signs important in biomedical detection.Measurement method is the arteries and veins by detecting human body
Wave fight to obtain specific value.The present invention is made into the sensing node in wireless body area network, real-time monitoring human health status
And real-time display, reach prevention disease, the purpose treated in time is especially timely and rapid to the monitoring of chronic disease, for whole
A mankind's rehabilitation project is of great significance.
The present invention controls probe source by single-chip microcontroller and issues detection light, after transmiting tissue, by photodetector institute
It receives, completes optical signal to the conversion of electric signal, heart rate signal is after filtering, being isolated the operation of amplification and shaping, by counting
Module is counted, and blood oxygen signal is converted to digital signal by AD conversion module, and computing module calculates blood oxygen levels and heart rate value, deposits
Storage module storage blood oxygen levels and heart rate value are simultaneously sent to Wi-Fi module, are transferred on computer or cell phone application by Wi-Fi module
It is shown.The present invention can be continuous, real-time quick detection blood oxygen and heart rate and externally send, use is easy and convenient, at low cost
Honest and clean, near infrared light not will cause any damage to human body without any radiation.
Detailed description of the invention
Fig. 1 is the structural block diagram of the sensing node of blood oxygen and heart rate in wireless body area network described in specific embodiment;
Fig. 2 is the circuit diagram of the sensing node of blood oxygen and heart rate in wireless body area network described in specific embodiment;
Fig. 3 is the operational flowchart of the sensing node of blood oxygen and heart rate in wireless body area network described in specific embodiment.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without making creative work it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be further explained below with reference to the attached drawings and specific examples, but not as the limitation of the invention.
In wireless body area network described in present embodiment at the sensing node of blood oxygen and heart rate, including detecting module, signal
Manage module and single-chip microcontroller;
Detecting module includes probe source 1 and photodetector 2, and signal processing module includes filter circuit 3, isolation amplification
Circuit 4 and shaping circuit 5, single-chip microcontroller include control module 6, AD conversion module 7, counting module 8, computing module 9, memory module
10 and Wi-Fi module 11;
Control module 6 controls the transmitting light of probe source 1, when detecting blood oxygen, 1 alternate emission two of probe source
The light of kind wavelength, when detecting heart rate, probe source 1 emits the light of single wavelength;
The light that probe source 1 emits is transmitted through photodetector 2, the output end connection of photodetector 2 through tissue
The input terminal of filter circuit 3;
When detecting blood oxygen, filter circuit 3 exports blood oxygen signal to AD conversion module 7, when detecting heart rate, filter circuit
3 export heart rate signal to isolating amplifier circuit 4, the input terminal of the output end connection shaping circuit 5 of isolating amplifier circuit 4, shaping
The input terminal of the output end connection count module 8 of circuit 5, the output end of AD conversion module 7 and the output end of counting module 8 connect
The input terminal of computing module 9 is connect, the blood oxygen levels of computing module 9 connect the input terminal of memory module 10 with heart rate value output end, deposit
The input terminal of the output end connection Wi-Fi module 11 of module 10 is stored up, Wi-Fi module 11 sends blood oxygen levels and the heart to external equipment 12
Rate value.
In present embodiment, two kinds of wavelength that probe source 1 emits light are respectively 660nm and 940nm.
In present embodiment, the LED using CC3200 single-chip processor i/o mouth control probe source 1 makes its alternate emission 660nm
Feux rouges and 940nm infrared light, place a finger on LED and 2 middle of photodetector, light made vertically to penetrate finger tip finally quilt
Photodetector 2 is received, and obtained dual wavelength photoplethysmographic signal is faint change on the basis of stepped direct current signal
The AC signal of change, amplitude of variation belong to a millivolt rank.By dual wavelength alternating current-direct current part after AD conversion module AD conversion
Amplitude: the AC portion amplitude I of 660nmAC1, direct current component amplitude IDC1;The AC portion amplitude I of 940nmAC2, direct current component width
Value IDC2It is sent into computing module 9, blood oxygen levels can be calculated using the empirical equation that amendment Lambert-Beer's law sums up, seen (public
Formula 1):
This new Non-invasive detection technology of near infrared no-wound tissue detection technology is more humanized.Be based primarily upon infrared light with
The principle of the interaction of tissue can be deep into tissue several centimetres when the light of IR regions is incident on human body, by
In absorption and strong scattering effect by biological tissue's body, therefore, transmitted light can carry dampening information in a large amount of organizer, just
The difference that can use its absorption line extracts these information, and obtains the useful information of organizer by analysis.
Moreover, currently, population aging is a kind of global development trend, population in the world aging and medical treatment cost
Rise the anxiety for leading to world health health care infrastructure.Aging of population bring chronic disease, health care and old age
The problems such as quality of life, has become significant challenge.Due to the exacerbation of Disease Spectrum, medical health system will be unable to provide enough
Professional person attend to the patient.Simultaneously as the reason of convenient or cost, more and more people can not select hospital, and
It wishes to obtain medical treatment help by wireless sensor network.Existing product is the measurement for realizing physiological parameter numerical value, is not had
Measured value is further utilized, patient provides automatic therapy etc. with greater need for the prevention for carrying out next step according to measured value.
Wireless body area network (Wireless Body Area Network, WBAN) is attached to a kind of net with human body
Network, by a set of small and exquisite removable, sensor node with communication function and body main website (or BAN coordinator) group
At.These sensor nodes are wirelessly communicated, can guard closely the vital sign of user and provide feedback and
The automatic therapy control of certain mode is provided, to help user to keep optimum health state.The sensing node of present embodiment can
It is integrated into a Telemedicine System, and in case of emergency independently can send the data information in relation to patient health situation,
The variation for constantly reminding medical staff alieni juris items physiological parameter, forms the intelligent medical treatment network of complete set.Therefore make to survey
Amount equipment realizes that accurately and rapidly communication function is the key technology of wireless body area network, and present embodiment meets technical requirements.
Fig. 2 is the circuit diagram of the sensing node of blood oxygen and heart rate in wireless body area network, each portion of signal processing module
Parallel circuit draws signal using contact pin, is convenient for measuring.R in figure is resistance, and C is capacitor, and the OPT in photodetector 2 is light
Electric explorer part, model OPT101, the S1 in filter circuit 3 are mode conversion switch, the LM324 in isolating amplifier circuit 4
Amplify the model of operational amplifier for isolation, the LM311 in shaping circuit 5 is the model of integrated voltage comparator.
Experimental verification:
In order to verify the validity of the sensing node of blood oxygen and heart rate in the wireless body area network, and guarantee measurement result
Accurately, need to carry out the consistency of control experiment confirmatory measurement result.Using this sensing node to three experimental subjects first, second,
Third has carried out Oximetry under rest state, to verify the accuracy of present apparatus measurement.Experimental subjects is respectively as follows:
First: the male that the age is 22, height: 178cm, weight: 75kg, health;
Second: the male that the age is 48, height: 173cm, weight: 70kg, health;
Third: the women that the age is 22, height: 165cm, weight: 62kg, health.
Experimental result is shown in Table 1, using the measured value of standard medical instrument as standard.
1 human body blood oxygen saturation control experiment results of table
Experimental subjects | Present apparatus measured value | Canonical measure value | Absolute error | Relative error |
First | 97.5 | 97 | 0.5 | 0.56% |
Second | 98.6 | 99 | 0.4 | 0.40% |
Third | 96.3 | 96 | 0.3 | 0.31% |
It is compared with standard results, show that error range within 0.6%, is met the requirements, it was demonstrated that the feasibility of the present apparatus.
In heart rate measurement, using this sensing node to three experimental subjects first, second, third under rest state, carry 3kg
Pulses measure is carried out after weight and the 150m that hurries up, to verify the accuracy of pulse counting function.Experimental subjects is compareed with blood oxygen
Experiment.Experimental result is shown in Table 2,3,4 respectively, using stethoscope measured value as standard.
2 resting heart rate control experiment results of table
Experimental subjects | Present apparatus measured value | Canonical measure value | Absolute error | Relative error |
First | 69 | 70 | 1 | 1.43% |
Second | 71 | 73 | 2 | 2.73% |
Third | 75 | 74 | 1 | 1.35% |
Heart rate control experiment results after 3 carrying heavy goods of table
Experimental subjects | Present apparatus measured value | Canonical measure value | Absolute error | Relative error |
First | 96 | 97 | 1 | 1.03% |
Second | 84 | 82 | 2 | 2.44% |
Third | 101 | 100 | 1 | 1.00% |
Table 4 hurry up after heart rate control experiment results
Experimental subjects | Present apparatus measured value | Canonical measure value | Absolute error | Relative error |
First | 147 | 145 | 2 | 1.37% |
Second | 124 | 126 | 2 | 1.56% |
Third | 153 | 156 | 3 | 1.92% |
Compared with standard results, show that error range within 2.73%, is met the requirements, it was demonstrated that the present apparatus it is feasible
Property.
Blood oxygen numerical value and HR values respectively obtain after there are in the memory module inside single-chip microcontroller, then pass through Wi-Fi mould
Block transfers data in cell phone application.To unify port numbers and IP address with the present apparatus before the operation of this cell phone application.
In connection after Wi-Fi module network, corresponding port numbers and IP are obtained, and show in serial ports detection window
Come, open this APP later, identical unified port numbers and IP address are inputted in operation interface, is then sent out to this measuring device
The instruction of a login is sent, the instruction equally occurs in serial ports detection window, illustrates to log in effectively, APP is connected to development board
The same channel Wi-Fi.Blood oxygen numerical value and HR values are immediately conveyed to cell phone application interface later, complete blood oxygen numerical value and
Real-time, the efficient and accurate transmission of HR values, realizes the design and reality of blood oxygen and sensing heart rate node in wireless body area network
It is existing.
Claims (3)
1. the sensing node of blood oxygen and heart rate in wireless body area network, which is characterized in that including detecting module, signal processing module and
Single-chip microcontroller;
Detecting module includes probe source (1) and photodetector (2), and signal processing module includes filter circuit (3), is isolated and puts
Big circuit (4) and shaping circuit (5), single-chip microcontroller include control module (6), AD conversion module (7), counting module (8), calculate mould
Block (9), memory module (10) and Wi-Fi module (11);
Control module (6) controls the transmitting light of probe source (1), when detecting blood oxygen, probe source (1) alternate emission
The light of two kinds of wavelength, when detecting heart rate, probe source (1) emits the light of single wavelength;
The light of probe source (1) transmitting is transmitted through photodetector (2) through tissue, and the output end of photodetector (2) connects
Connect the input terminal of filter circuit (3);
When detecting blood oxygen, filter circuit (3) exports blood oxygen signal and gives AD conversion module (7), when detecting heart rate, filter circuit
(3) it exports heart rate signal to give isolating amplifier circuit (4), the input of output end connection shaping circuit (5) of isolating amplifier circuit (4)
End, the input terminal of the output end connection count module (8) of shaping circuit (5), the output end and counting module of AD conversion module (7)
(8) output end is all connected with the input terminal of computing module (9), and the blood oxygen levels of computing module (9) are connected with heart rate value output end to be deposited
Store up the input terminal of module (10), the input terminal of output end connection Wi-Fi module (11) of memory module (10), Wi-Fi module
(11) blood oxygen levels and heart rate value are sent to external equipment (12).
2. the sensing node of blood oxygen and heart rate in wireless body area network according to claim 1, which is characterized in that probe source
(1) emitting two kinds of wavelength of light is respectively 660nm and 940nm.
3. the sensing node of blood oxygen and heart rate in wireless body area network according to claim 2, which is characterized in that computing module
(9) blood oxygen levels are calculated according to blood oxygen signal, specifically:
Wherein, SpO2For blood oxygen levels, IAC1Amplitude, I for 660nm AC portionDC1For the amplitude of 660nm direct current component, IAC2For
The amplitude of 940nm AC portion, IDC2For the amplitude of 940nm direct current component.
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