CN106667484A - Electrode looseness detection and automatic warning device in electroencephalogram collection and control method of device - Google Patents
Electrode looseness detection and automatic warning device in electroencephalogram collection and control method of device Download PDFInfo
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- CN106667484A CN106667484A CN201710025659.6A CN201710025659A CN106667484A CN 106667484 A CN106667484 A CN 106667484A CN 201710025659 A CN201710025659 A CN 201710025659A CN 106667484 A CN106667484 A CN 106667484A
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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
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
- A61B5/291—Bioelectric electrodes therefor specially adapted for particular uses for electroencephalography [EEG]
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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
- A61B5/74—Details of notification to user or communication with user or patient ; user input means
- A61B5/746—Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/185—Electrical failure alarms
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0266—Operational features for monitoring or limiting apparatus function
- A61B2560/0276—Determining malfunction
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Abstract
The invention discloses an electrode looseness detection and automatic warning device in electroencephalogram collection and a control method of the device. The device comprises a constant flow source stimulating module, an impedance signal extracting and processing module, an electrode looseness detection and automatic warning module. The constant flow source stimulating module generates a weak constant flow source stimulating signal, and a testee is stimulated through a test electrode; a voltage signal fed back by the testee is extracted and subjected to amplification, filtering and A/D conversion; the electrode looseness detection and automatic warning module calculates the processed voltage signal, the voltage signal is converted to a resistance value to be displayed, the resistance value is compared with a preset threshold value, whether electrode looseness appears or not is judged, and an alarm is given in time when the electrode looseness appears. The resistance value of the test electrode in the electroencephalogram collection is monitored and displayed in real time, the device can detect the electrode looseness when the electrode looseness appears and gives an alarm in time, the reliability of the electroencephalogram signal collection and the data accuracy are guaranteed, and the device is suitable for electroencephalogram collection in a laboratory.
Description
Technical field
The present invention relates to the clinical electrode impedance value with laboratory brain wave acquisition is measured, a kind of brain wave acquisition is specifically provided
Middle electrode loosens detection with autoalarm and its control method.
Background technology
Used as the system for adjusting the various vital movements of the domination mankind, no matter extraneous in the behavior of driving, perception nervous system is, also
It is that the everyways such as the functional statuss of reflection people play extremely important role.By the detection to nervous system, Wo Menke
Cannot be by subjective description or other detections with regard to human body itself mechanism, inside of human body active state etc. therefrom to obtain many
The information that method is obtained.And brain electricity possesses very heavy as the distinctive product of brain itself in brain science with nuroinformatics
The status wanted.
EEG signals are spontaneous, the rhythmicity electrical activities of the brain electricity cell mass recorded by electrode, and it is contained
Substantial amounts of physiology and pathological information.In brain wave acquisition measurement, the quality of signal quality is largely dependent on electrode and patient
Contact impedance.Electrode impedance is bigger, represents that electrode is bad with contact patients, and the reliability of measurement is lower.Electrode impedance is less,
Represent that electrode is more reliable with contact patients, the signal quality of extraction is also better.If electrode loosens or de- in brain electric system
Fall, can to a great extent affect the extraction of signal and the reliability of data.Therefore the real-time contact monitoring to electrode and patient exists
Have great significance in EEG measuring.
At present still without can in real-time monitoring brain wave acquisition electrode contact situation and when electrode loosens automatic alarm
Device.
The content of the invention
For defect involved in background technology, the present invention provide electrode in a kind of brain wave acquisition loosen detection with from
Dynamic alarm device and its control method.
The present invention is employed the following technical solutions to solve above-mentioned technical problem：
Electrode loosens detection and autoalarm in a kind of brain wave acquisition, extracts comprising constant-current source excitation module, impedance signal
Processing module, electrode loosens detection and automatic alarm module；
The constant-current source excitation module is connected with subjectss；Impedance signal extraction process module loosens detection with report automatically with electrode
Alert module is connected；
The constant-current source excitation module is used to produce constant current drive signal；
The impedance signal extraction process module is used to extract the voltage signal that subjectss feed back, the voltage signal that will be extracted
Electrode is passed to after amplified, filtering, A/D conversion process loosen detection and automatic alarm module；
The voltage signal that the electrode loosens detection and is used to transmit impedance signal extraction process module with automatic alarm module turns
Resistance value is changed to, and resistance value is compared with default threshold value, when resistance value exceeds threshold value, then loosening occurs in electrode, while
Send alarm.
The further preferred scheme of detection and autoalarm, institute are loosened as electrode in a kind of brain wave acquisition of the invention
State constant-current source excitation module and produce circuit, constant current source generating circuit, impedance detection channel switching control circuit comprising pumping signal；
The pumping signal produces the outfan of circuit and is connected with the input of constant current source generating circuit；
The outfan of the constant current source generating circuit is connected with the input of impedance detection channel switching control circuit；
The impedance detection channel switching control circuit is used for the closure by the different relays of control, by constant-current source pumping signal
Import different electrodes.
The further preferred scheme of detection and autoalarm, institute are loosened as electrode in a kind of brain wave acquisition of the invention
Impedance signal extraction process module is stated comprising voltage monitoring unit, voltage signal filtering and amplifying circuit, A/D change-over circuits；
The outfan of the voltage monitoring unit is connected with the input of the voltage signal filtering and amplifying circuit；
The outfan of the voltage signal filtering and amplifying circuit is connected with the input of the A/D change-over circuits；
The voltage monitoring unit is used to monitoring the voltage that electrode two ends when constant current flows through electrode produce, and will monitor
Voltage is delivered to voltage signal filtering and amplifying circuit, A/D change-over circuits；
The A/D change-over circuits be used for the analogue signal for receiving is converted to into digital signal, be delivered to electrode loosen detection with
Automatic alarm module.
The further preferred scheme of detection and autoalarm, institute are loosened as electrode in a kind of brain wave acquisition of the invention
State electrode and loosen detection with automatic alarm module comprising impedance display circuit and automatic alarm circuit；
The impedance display circuit is used to show the concrete numerical value of test electrode impedance；
The automatic alarm circuit is used to be reported to the police when resistance value exceeds threshold value.
A kind of control method that detection and autoalarm are loosened based on electrode in brain wave acquisition, is comprised the steps of：
Step 1）, constant-current source excitation module sends constant current signal, by testing electrode excitation to subjectss；
Step 2）, impedance signal extraction process module extracts the voltage signal that subjectss feed back, and it is amplified, is filtered
Ripple, A/D conversion process, are then passed to electrode and loosen detection and automatic alarm module；
Step 3）, electrode loosens detection and receives after the voltage signal for having processed with automatic alarm module, based on Ohm's law U=IR
Resistance value is calculated, resistance value is shown in impedance display unit, while resistance value is compared with threshold value, detecting electrode is
No to occur loosening, when electrode impedance value exceeds threshold value, order automatic alarm circuit is reported to the police.
Beneficial effect of the present invention：
1st, apparatus of the present invention encourage module to produce constant current signal by constant-current source, by electrode excitation to subjectss；Impedance signal
Extraction process module extracts the voltage signal that subjectss feed back, and it is processed, and is then passed to electrode pine
Dynamic detection and automatic alarm module；Electrode loosens detection and receives after the voltage signal for having processed with automatic alarm module, and it is entered
Row calculating is converted to resistance value, and resistance value is shown in real time in impedance display unit, while by resistance value and predetermined threshold value
Be compared, beyond threshold value when control warning circuit reported to the police；
2nd, the present invention weighs contact situation of the electrode for encephalograms with subjectss by the measurement to electrode impedance, it is ensured that collect
Reliable EEG signals, have important practical value in clinical EEG measuring and laboratory brain wave acquisition.
Description of the drawings
Fig. 1 is the integrated stand composition of the present invention；
Fig. 2 is the circuit theory diagrams of the present invention；
Fig. 3 is the instrumentation plan of the present invention.
Wherein, K0, K1, K2, K3, K4, K5, K（n-1）、K（n）For relay；Z1, Z2, Z3, Z4, Z（n-1）, Z (n) be
The electrode contacted with subjectss i.e. measuring electrode, Zc is public electrode.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in further detail：
As shown in figure 1, electrode loosens detection and autoalarm, including constant-current source excitation module, resistance in a kind of brain wave acquisition
Antinoise signal extraction process module, electrode loosens detection and automatic alarm module；The constant-current source excitation module and subjectss' head
It is connected；Impedance signal extraction process module loosens detection and is connected with automatic alarm module with electrode；
The constant-current source excitation module is used to produce constant current drive signal；
The impedance signal extraction process module is used to extract the voltage signal that subjectss feed back, the voltage signal that will be extracted
Electrode is passed to after amplified, filtering, A/D conversion process loosen detection and automatic alarm module；
The electrode loosens detection and automatic alarm module based on the voltage signal for transmitting impedance signal extraction process module
Calculation is converted to resistance value, and by impedance display unit concrete numerical value is shown, and resistance value is compared with default threshold value, judges
Electrode contacts situation with subjectss；When resistance value exceeds threshold value, then loosening occurs in electrode, while being entered by automatic alarm circuit
Row is reported to the police.
The constant-current source excitation module produces circuit, constant current source generating circuit, impedance detection passage and opens comprising pumping signal
Close control circuit；
The pumping signal produces the outfan of circuit and is connected with the input of constant current source generating circuit；
The outfan of the constant current source generating circuit is connected with the input of impedance detection channel switching control circuit；
The impedance detection channel switching control circuit is used for the closure by the different relays of control, by constant-current source pumping signal
Import different electrodes.
The impedance signal extraction process module includes voltage monitoring unit, voltage signal filtering and amplifying circuit, A/D conversions
Circuit；
The outfan of the voltage monitoring unit is connected with the input of the voltage signal filtering and amplifying circuit；
The outfan of the voltage signal filtering and amplifying circuit is connected with the input of the A/D change-over circuits；
The voltage monitoring unit is used to monitoring the voltage that electrode two ends when constant current flows through electrode produce, and will monitor
Voltage is delivered to voltage signal filtering and amplifying circuit, A/D change-over circuits；
The A/D change-over circuits be used for the analogue signal for receiving is converted to into digital signal, be delivered to electrode loosen detection with
Automatic alarm module.
The electrode loosens detection with automatic alarm module comprising impedance display circuit and automatic alarm circuit；
The impedance display circuit is used to show the concrete numerical value of test electrode impedance；
The automatic alarm circuit is used to be reported to the police when resistance value exceeds threshold value.
A kind of control method that detection and autoalarm are loosened based on electrode in brain wave acquisition, is comprised the steps of：
Step 1）, constant-current source excitation module sends constant current signal, by testing electrode excitation to subjectss；
Step 2）, impedance signal extraction process module extracts the voltage signal that subjectss feed back, and it is amplified, is filtered
Ripple, A/D conversion process, are then passed to electrode and loosen detection and automatic alarm module；
Step 3）, electrode loosens detection and receives after the voltage signal for having processed with automatic alarm module, based on Ohm's law U=IR
Resistance value is calculated, resistance value is shown in impedance display unit, while resistance value is compared with threshold value, detecting electrode is
No to occur loosening, when electrode impedance value exceeds threshold value, order warning circuit is reported to the police.
As shown in Fig. 2 the constant-current source excitation module produces circuit, constant current source generating circuit, impedance comprising pumping signal
Sense channel ON-OFF control circuit；Pumping signal produces circuit to be used to produce 0-5 μ V, frequency with constant current source generating circuit
The constant current drive signal of 200HZ；Impedance detection channel switching control circuit is used for the closure by the different relays of control, by perseverance
Stream source forcing signal imports different electrodes, and the constant current signal flows through electrode and can produce electricity of the size tens to hundreds of mV
Pressure, and by testing electrode excitation to subjectss；
As shown in Fig. 2 the impedance signal extraction process module includes voltage signal filtering and amplifying circuit, A/D change-over circuits；Electricity
Pressure signal amplification circuit filter, A/D change-over circuits are by the voltage signal of extraction is amplified, filtering, pass to after A/D conversion process
Electrode loosens detection and automatic alarm module；The voltage signal that subjectss feed back can be amplified to V levels by amplifying circuit.
The electrode loosens detection with automatic alarm module comprising impedance display circuit and automatic alarm circuit；Impedance display
Circuit is used to show the concrete numerical value of test electrode impedance；Automatic alarm circuit is used to be reported when resistance value exceeds threshold value
It is alert；
As shown in figure 3, main control part of the present invention with single-chip microcomputer as whole device.It is multinomial with Single-chip Controlling by pre-set programs
Relay being opened and closing, realizing the measurement of electrode impedance value.Pre-set programs function：First, relay K0 closures, K5 disconnects,
Successively control relay K1, K2, K3, K4 are closed, and K2, K3, K4 are all off during K1 closures；When K2 is closed, K1, K3, K4 are complete
Portion disconnects；K1, K2, K4 are all off when K3 is closed；It is K1 when K4 is closed, K2, K3, all off.Constant-current source swashs when closing such as K0
Encourage signal code I and import Z1 electrodes, derived to ground connection by public electrode Zc electrode signals, the Z1 for detecting and the combined impedance of Zc
Voltage Uz1=(the Z1+Zc) × I of correspondence monitoring；Uz2=(Z2+Zc) × I, Uz3=(Z3+Zc) × I, Uz4=can be obtained successively in the same manner
(Z4+Zc)×I……Uz(n)=[Z(n)+Zc]×I；Then relay K0 disconnects, K5 closures, and K1 closures can be obtained：Uz0=
(Z1+Z2)×I；Joint above equation can be obtained by the corresponding electrode contact impedance Z1 of each electrode, Z2, Z3, Z4 ... Z
(n)、Zc.Program operation a cycle can then measure the resistance value of a group of Z1, Z2, Z3, Z4 ... Z (n), and program circular flow is then
The resistance value of all electrodes to be measured can in real time be shown.Based on this principle, the present invention is completed to multinomial by single-chip microcomputer pre-set programs
The selection control of relay, is then calculated, and can be achieved with the monitoring to each electrode impedance to be measured；
Display of the impedance display circuit realiration to electrode impedance value.Electrode is shown using Single-chip Controlling LCD liquid crystal display screen
The resistance value of Z1, Z2, Z3, Z4 ... Z (n)；
Automatic alarm circuit realizes warning function.It is demonstrated experimentally that when electrode contacts good with subjectss, electrode impedance is less than 30K
Ω；When loosening occurs in electrode, then electrode impedance is more than 30 K Ω.So in single-chip microcomputer, default impedance threshold is 30K Ω,
When electrode is contacted well with subjectss, monitor electrode impedance value and be then less than 30K Ω；When loosening occurs in electrode, electricity is monitored
Pole resistance value can be more than 30K Ω, and at this moment Single-chip Controlling buzzer sends " ticking " sound and reported to the police.
Claims (5)
1. in a kind of brain wave acquisition electrode loosen detection and autoalarm, it is characterised in that comprising constant-current source excitation module,
Impedance signal extraction process module, electrode loosens detection and automatic alarm module；
The constant-current source excitation module is connected with subjectss；Impedance signal extraction process module loosens detection with report automatically with electrode
Alert module is connected；
The constant-current source excitation module is used to produce constant current drive signal；
The impedance signal extraction process module is used to extract the voltage signal that subjectss feed back, the voltage signal that will be extracted
Electrode is passed to after amplified, filtering, A/D conversion process loosen detection and automatic alarm module；
The voltage signal that the electrode loosens detection and is used to transmit impedance signal extraction process module with automatic alarm module turns
Resistance value is changed to, and resistance value is compared with default threshold value, when resistance value exceeds threshold value, then loosening occurs in electrode, while
Send alarm.
2. electrode loosens detection and autoalarm in a kind of brain wave acquisition according to claim 1, it is characterised in that
The constant-current source excitation module produces circuit, constant current source generating circuit, impedance detection channel switching control electricity comprising pumping signal
Road；
The pumping signal produces the outfan of circuit and is connected with the input of constant current source generating circuit；
The outfan of the constant current source generating circuit is connected with the input of impedance detection channel switching control circuit；
The impedance detection channel switching control circuit is used for the closure by the different relays of control, by constant-current source pumping signal
Import different electrodes.
3. electrode loosens detection and autoalarm in a kind of brain wave acquisition according to claim 1, it is characterised in that
The impedance signal extraction process module includes voltage monitoring unit, voltage signal filtering and amplifying circuit, A/D change-over circuits；
The outfan of the voltage monitoring unit is connected with the input of the voltage signal filtering and amplifying circuit；
The outfan of the voltage signal filtering and amplifying circuit is connected with the input of the A/D change-over circuits；
The voltage monitoring unit is used to monitoring the voltage that electrode two ends when constant current flows through electrode produce, and will monitor
Voltage is delivered to voltage signal filtering and amplifying circuit, A/D change-over circuits；
The A/D change-over circuits be used for the analogue signal for receiving is converted to into digital signal, be delivered to electrode loosen detection with
Automatic alarm module.
4. electrode loosens detection and autoalarm in a kind of brain wave acquisition according to claim 1, it is characterised in that
The electrode loosens detection with automatic alarm module comprising impedance display circuit and automatic alarm circuit；
The impedance display circuit is used to show the concrete numerical value of test electrode impedance；
The automatic alarm circuit is used to be reported to the police when resistance value exceeds threshold value.
5. the control method of detection and autoalarm is loosened based on electrode in the brain wave acquisition described in claim 1, and it is special
Levy and be, comprise the steps of：
Step 1）, constant-current source excitation module sends constant current signal, by testing electrode excitation to subjectss；
Step 2）, impedance signal extraction process module extracts the voltage signal that subjectss feed back, and it is amplified, is filtered
Ripple, A/D conversion process, are then passed to electrode and loosen detection and automatic alarm module；
Step 3）, electrode loosens detection and receives after the voltage signal for having processed with automatic alarm module, based on Ohm's law U=IR
Resistance value is calculated, resistance value is shown in impedance display unit, while resistance value is compared with threshold value, detecting electrode is
No to occur loosening, when electrode impedance value exceeds threshold value, order automatic alarm circuit is reported to the police.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108309289A (en) * | 2018-02-11 | 2018-07-24 | 广东欧珀移动通信有限公司 | Acquiring brain waves method and relevant device |
| CN109730675A (en) * | 2019-01-04 | 2019-05-10 | 深圳市舟洁信息咨询服务有限公司 | A kind of EEG signals quality detecting system and method |
| CN110243871A (en) * | 2018-03-09 | 2019-09-17 | 苏州宝时得电动工具有限公司 | Vegetation identifying system, method and grass trimmer |
| CN110584657A (en) * | 2019-03-15 | 2019-12-20 | 华为技术有限公司 | Attention detection method and system |
| CN111481194A (en) * | 2020-04-23 | 2020-08-04 | 翟红 | Feedback acquisition system for electroencephalogram signals |
| CN111836577A (en) * | 2020-02-03 | 2020-10-27 | 深圳市汇顶科技股份有限公司 | Contact state detection device and wearable equipment |
| CN112401898A (en) * | 2020-11-11 | 2021-02-26 | 西安臻泰智能科技有限公司 | High-precision electroencephalogram signal acquisition method and device |
| CN112438733A (en) * | 2020-11-06 | 2021-03-05 | 南京大学 | Portable neonatal convulsion electroencephalogram monitoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108309289A (en) * | 2018-02-11 | 2018-07-24 | 广东欧珀移动通信有限公司 | Acquiring brain waves method and relevant device |
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| CN110584657A (en) * | 2019-03-15 | 2019-12-20 | 华为技术有限公司 | Attention detection method and system |
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| CN111836577B (en) * | 2020-02-03 | 2023-08-08 | 深圳市汇顶科技股份有限公司 | Contact state detection device and wearable equipment |
| CN111481194A (en) * | 2020-04-23 | 2020-08-04 | 翟红 | Feedback acquisition system for electroencephalogram signals |
| CN112438733A (en) * | 2020-11-06 | 2021-03-05 | 南京大学 | Portable neonatal convulsion electroencephalogram monitoring system |
| CN112401898A (en) * | 2020-11-11 | 2021-02-26 | 西安臻泰智能科技有限公司 | High-precision electroencephalogram signal acquisition method and device |
| CN112401898B (en) * | 2020-11-11 | 2024-03-12 | 西安臻泰智能科技有限公司 | High-precision electroencephalogram signal acquisition method and device |
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