CN106667484B - Electrode loosening detection and automatic alarm device in electroencephalogram acquisition and control method thereof - Google Patents
Electrode loosening detection and automatic alarm device in electroencephalogram acquisition and control method thereof Download PDFInfo
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- 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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Abstract
The invention discloses an electrode loosening detection and automatic alarm device in electroencephalogram acquisition and a control method thereof. The constant current source excitation module generates a weak constant current excitation signal, and the weak constant current excitation signal is excited to a tested person through the test electrode; extracting a voltage signal fed back by a tested person, and performing amplification, filtering and A/D conversion treatment; the electrode loosening detection and automatic alarm module calculates the processed voltage signal, converts the voltage signal into an impedance value, displays the impedance value, compares the impedance value with a preset threshold value, judges whether the electrode is loosened, and alarms when the electrode is loosened. The invention monitors and displays the impedance value of the test electrode in the electroencephalogram acquisition in real time, can detect and alarm in time when the electrode is loosened, ensures the reliability of electroencephalogram acquisition and the accuracy of data, and is suitable for clinical and laboratory electroencephalogram acquisition.
Description
Technical Field
The invention relates to electrode impedance value measurement in clinical and laboratory electroencephalogram acquisition, and particularly provides an electrode loosening detection and automatic alarm device in electroencephalogram acquisition and a control method thereof.
Background
As a system for regulating various vital activities of human beings, the nervous system plays an extremely important role in various aspects such as driving behavior, sensing the outside world, and reflecting the functional state of human beings. By detecting the nervous system, we can obtain many information about the mechanism of the human body itself, the internal activity state of the human body, etc. which cannot be obtained by subjective description or other detection methods. And the brain electricity is taken as a specific product of the brain, and has very important position in brain science and neuroinformatics.
The brain electrical signal is spontaneous and rhythmic electrical activity of brain electrical cell group recorded by electrode, and contains a great amount of physiological and pathological information. In electroencephalogram acquisition measurement, the quality of signal quality depends greatly on the contact impedance of the electrode with the patient. The greater the electrode impedance, the less reliable the measurement, indicating poor contact of the electrode with the patient. The smaller the electrode impedance, the more reliable the electrode contact with the patient, and the better the quality of the extracted signal. If the electrodes are loosened or fall off in an electroencephalogram system, the extraction of signals and the reliability of data can be greatly affected. Therefore, the real-time contact monitoring of the electrode and the patient has important significance in the electroencephalogram measurement.
At present, no device capable of monitoring the contact condition of electrodes in electroencephalogram acquisition in real time and automatically alarming when the electrodes are loosened exists.
Disclosure of Invention
Aiming at the defects related to the background technology, the invention provides an electrode loosening detection and automatic alarm device in electroencephalogram acquisition and a control method thereof.
The invention adopts the following technical scheme for solving the technical problems:
the device comprises a constant current source excitation module, an impedance signal extraction processing module and an electrode loosening detection and automatic alarm module;
the constant current source excitation module is connected with the tested person; the impedance signal extraction processing module is connected with the electrode loosening detection and automatic alarm module;
the constant current source excitation module is used for generating a constant current excitation signal;
the impedance signal extraction processing module is used for extracting a voltage signal fed back by a tested person, and transmitting the extracted voltage signal to the electrode loosening detection and automatic alarm module after amplification, filtering and A/D conversion;
the electrode loosening detection and automatic alarm module is used for converting the voltage signal transmitted by the impedance signal extraction processing module into an impedance value, comparing the impedance value with a preset threshold value, and when the impedance value exceeds the threshold value, loosening the electrode and simultaneously giving an alarm.
As a further preferable scheme of the electrode loosening detection and automatic alarm device in electroencephalogram acquisition, the constant current source excitation module comprises an excitation signal generation circuit, a constant current source generation circuit and an impedance detection channel switch control circuit;
the output end of the excitation signal generating circuit is connected with the input end of the constant current source generating circuit;
the output end of the constant current source generating circuit is connected with the input end of the impedance detection channel switch control circuit;
the impedance detection channel switch control circuit is used for guiding the constant current source excitation signals into different electrodes by controlling the closing of different relays.
As a further preferable scheme of the electrode loosening detection and automatic alarm device in electroencephalogram acquisition, the impedance signal extraction processing module comprises a voltage monitoring unit, a voltage signal amplifying and filtering circuit and an A/D conversion circuit;
the output end of the voltage monitoring unit is connected with the input end of the voltage signal amplifying and filtering circuit;
the output end of the voltage signal amplifying and filtering circuit is connected with the input end of the A/D conversion circuit;
the voltage monitoring unit is used for monitoring the voltage generated at two ends of the electrode when the constant current flows through the electrode and transmitting the monitored voltage to the voltage signal amplifying and filtering circuit and the A/D conversion circuit;
the A/D conversion circuit is used for converting the received analog signals into digital signals and transmitting the digital signals to the electrode loosening detection and automatic alarm module.
As a further preferable scheme of the electrode loosening detection and automatic alarm device in electroencephalogram acquisition, the electrode loosening detection and automatic alarm module comprises an impedance display circuit and an automatic alarm circuit;
the impedance display circuit is used for displaying specific values of the impedance of the test electrode;
the automatic alarm circuit is used for alarming when the impedance value exceeds a threshold value.
A control method of an electrode loosening detection and automatic alarm device based on electroencephalogram acquisition comprises the following steps:
step 1), a constant current source excitation module sends a constant current signal and is excited to a tested person through a test electrode;
step 2), the impedance signal extraction processing module extracts the voltage signal fed back by the tested person, amplifies, filters and A/D (analog to digital) converts the voltage signal, and then transmits the voltage signal to the electrode loosening detection and automatic alarm module;
and 3) after the electrode looseness detection and automatic alarm module receives the processed voltage signal, calculating an impedance value based on ohm law U=IR, displaying the impedance value on an impedance display unit, comparing the impedance value with a threshold value, detecting whether the electrode loosens or not, and commanding the automatic alarm circuit to alarm when the electrode impedance value exceeds the threshold value.
The invention has the beneficial effects that:
1. the device generates a constant current signal through the constant current source excitation module and is excited to a tested person through the electrode; the impedance signal extraction processing module extracts a voltage signal fed back by a tested person, processes the voltage signal and then transmits the voltage signal to the electrode loosening detection and automatic alarm module; after receiving the processed voltage signal, the electrode loosening detection and automatic alarm module calculates and converts the voltage signal into an impedance value, the impedance value is displayed in real time on the impedance display unit, meanwhile, the impedance value is compared with a preset threshold value, and when the impedance value exceeds the threshold value, the alarm circuit is controlled to alarm;
2. the invention measures the contact condition of the electroencephalogram electrode and the tested person through measuring the impedance of the electrode, ensures that reliable electroencephalogram signals are acquired, and has important practical value in clinical electroencephalogram measurement and laboratory electroencephalogram acquisition.
Drawings
FIG. 1 is a diagram of the overall architecture of the present invention;
FIG. 2 is a schematic circuit diagram of the present invention;
fig. 3 is a measurement schematic of the present invention.
Wherein K0, K1, K2, K3, K4, K5, K (n-1) and K (n) are relays; z1, Z2, Z3, Z4, Z (n-1) and Z (n) are measurement electrodes which are electrodes in contact with the subject, and Zc is a common electrode.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in FIG. 1, the device for detecting and automatically alarming electrode looseness in electroencephalogram acquisition comprises a constant current source excitation module, an impedance signal extraction processing module and an electrode looseness detection and automatic alarm module; the constant current source excitation module is connected with the head of the tested person; the impedance signal extraction processing module is connected with the electrode loosening detection and automatic alarm module;
the constant current source excitation module is used for generating a constant current excitation signal;
the impedance signal extraction processing module is used for extracting a voltage signal fed back by a tested person, and transmitting the extracted voltage signal to the electrode loosening detection and automatic alarm module after amplification, filtering and A/D conversion;
the electrode loosening detection and automatic alarm module is used for calculating and converting the voltage signal transmitted by the impedance signal extraction processing module into an impedance value, displaying a specific numerical value through the impedance display unit, comparing the impedance value with a preset threshold value, and judging the contact condition of the electrode and the tested person; when the impedance value exceeds the threshold value, the electrode loosens, and an automatic alarm circuit alarms.
The constant current source excitation module comprises an excitation signal generation circuit, a constant current source generation circuit and an impedance detection channel switch control circuit;
the output end of the excitation signal generating circuit is connected with the input end of the constant current source generating circuit;
the output end of the constant current source generating circuit is connected with the input end of the impedance detection channel switch control circuit;
the impedance detection channel switch control circuit is used for guiding the constant current source excitation signals into different electrodes by controlling the closing of different relays.
The impedance signal extraction processing module comprises a voltage monitoring unit, a voltage signal amplifying and filtering circuit and an A/D conversion circuit;
the output end of the voltage monitoring unit is connected with the input end of the voltage signal amplifying and filtering circuit;
the output end of the voltage signal amplifying and filtering circuit is connected with the input end of the A/D conversion circuit;
the voltage monitoring unit is used for monitoring the voltage generated at two ends of the electrode when the constant current flows through the electrode and transmitting the monitored voltage to the voltage signal amplifying and filtering circuit and the A/D conversion circuit;
the A/D conversion circuit is used for converting the received analog signals into digital signals and transmitting the digital signals to the electrode loosening detection and automatic alarm module.
The electrode loosening detection and automatic alarm module comprises an impedance display circuit and an automatic alarm circuit;
the impedance display circuit is used for displaying specific values of the impedance of the test electrode;
the automatic alarm circuit is used for alarming when the impedance value exceeds a threshold value.
A control method of an electrode loosening detection and automatic alarm device based on electroencephalogram acquisition comprises the following steps:
step 1), a constant current source excitation module sends a constant current signal and is excited to a tested person through a test electrode;
step 2), the impedance signal extraction processing module extracts the voltage signal fed back by the tested person, amplifies, filters and A/D (analog to digital) converts the voltage signal, and then transmits the voltage signal to the electrode loosening detection and automatic alarm module;
and 3) after the electrode looseness detection and automatic alarm module receives the processed voltage signal, calculating an impedance value based on ohm law U=IR, displaying the impedance value on an impedance display unit, comparing the impedance value with a threshold value, detecting whether the electrode loosens or not, and commanding an alarm circuit to alarm when the electrode impedance value exceeds the threshold value.
As shown in fig. 2, the constant current source excitation module comprises an excitation signal generation circuit, a constant current source generation circuit and an impedance detection channel switch control circuit; the excitation signal generation circuit and the constant current source generation circuit are used for generating a constant current excitation signal with the frequency of 200HZ and the voltage of 0-5 mu V; the impedance detection channel switch control circuit is used for guiding constant current source excitation signals into different electrodes by controlling the closing of different relays, and the constant current signals flow through the electrodes to generate a voltage with the magnitude of tens to hundreds mV and are excited to a tested person through the test electrodes;
as shown in fig. 2, the impedance signal extraction processing module includes a voltage signal amplifying and filtering circuit and an a/D conversion circuit; the voltage signal amplifying and filtering circuit and the A/D conversion circuit amplify, filter and A/D convert the extracted voltage signal and transmit the amplified voltage signal to the electrode loosening detection and automatic alarm module; the amplifying circuit can amplify the voltage signal fed back by the tested person to V level.
The electrode loosening detection and automatic alarm module comprises an impedance display circuit and an automatic alarm circuit; the impedance display circuit is used for displaying specific values of the impedance of the test electrode; the automatic alarm circuit is used for alarming when the impedance value exceeds a threshold value;
as shown in FIG. 3, the invention uses a singlechip as the main control part of the whole device. The opening and closing of the relays are controlled by a singlechip through a preset program, so that the measurement of the electrode impedance value is realized. Presetting program functions: firstly, a relay K0 is closed, a relay K5 is opened, relays K1, K2, K3 and K4 are sequentially controlled to be closed, and when the relay K1 is closed, all the relays K2, K3 and K4 are opened; when K2 is closed, K1, K3 and K4 are all disconnected; when K3 is closed, K1, K2 and K4 are all opened; k1, K2, K3 are all open when K4 is closed. If the constant current source excitation signal current I is led into the Z1 electrode when the K0 is closed, the signal of the common electrode Zc electrode is led out to the ground, and the detected joint impedance of the Z1 and the Zc corresponds to the monitored voltage Uz1= (Z1+Zc) x I; uz2= (z2+zc) × I, uz 3= (z3+zc) × I, uz 4= (z4+zc) ×i … … Uz (n) = [ Z (n) +zc ] ×i; then the relay K0 is opened, the relay K5 is closed, and the relay K1 is closed, so that the following steps can be obtained: uz0= (z1+z2) ×i; the electrode contact impedances Z1, Z2, Z3, Z4 … … Z (n) and Zc corresponding to each electrode can be obtained by combining the equations. The impedance values of a group of Z1, Z2, Z3 and Z4 … … Z (n) can be measured by running the program for one period, and the impedance values of all electrodes to be measured can be displayed in real time by running the program in a circulating way. Based on the principle, the invention completes the selection control of a plurality of relays through a singlechip preset program, and then calculates, thus realizing the monitoring of the impedance of each electrode to be detected;
the impedance display circuit displays the impedance value of the electrode. The LCD liquid crystal display screen is controlled by the singlechip to display impedance values of the electrodes Z1, Z2, Z3 and Z4 … … Z (n);
the automatic alarm circuit realizes an alarm function. Experiments prove that when the electrode is in good contact with a tested person, the impedance of the electrode is less than 30KΩ; when the electrode loosens, the electrode impedance is larger than 30K omega. Therefore, in the singlechip, the preset impedance threshold is 30KΩ, and when the electrode is in good contact with the tested person, the monitored electrode impedance value is smaller than 30KΩ; when the electrode is loose, the impedance value of the monitored electrode is larger than 30KΩ, and the singlechip controls the buzzer to send a beep and beep sound to alarm.
Claims (4)
1. The device for detecting and automatically alarming electrode looseness in electroencephalogram acquisition is characterized by comprising a constant current source excitation module, an impedance signal extraction processing module and an electrode looseness detection and automatic alarm module;
the constant current source excitation module is connected with the tested person; the impedance signal extraction processing module is connected with the electrode loosening detection and automatic alarm module;
the constant current source excitation module is used for generating a constant current excitation signal;
the impedance signal extraction processing module is used for extracting a voltage signal fed back by a tested person, and transmitting the extracted voltage signal to the electrode loosening detection and automatic alarm module after amplification, filtering and A/D conversion;
the electrode loosening detection and automatic alarm module is used for calculating and converting the voltage signal transmitted by the impedance signal extraction processing module into an impedance value, displaying a specific numerical value through the impedance display unit, comparing the impedance value with a preset threshold value, and judging the contact condition of the electrode and the tested person; when the impedance value exceeds the threshold value, the electrode loosens, and an automatic alarm circuit alarms;
the constant current source excitation module comprises an excitation signal generation circuit, a constant current source generation circuit and an impedance detection channel switch control circuit;
the output end of the excitation signal generating circuit is connected with the input end of the constant current source generating circuit;
the output end of the constant current source generating circuit is connected with the input end of the impedance detection channel switch control circuit;
the impedance detection channel switch control circuit is used for guiding the constant current source excitation signals into different electrodes by controlling the closing of different relays;
the impedance detection channel switch control circuit includes: a first relay K0 connected between the common electrode Zc and ground; a second relay K5 connected between the electrode Z1 and ground; a third relay Ki, i=1, 2, …, n, i connected between the electrode Zi and the constant current source generating circuit, is not equal to 5; the head of the tested person is connected with a common electrode Zc and n-1 electrodes Zi;
the impedance detection channel switch control circuit controls the opening and closing states of the relays K0, K5 and Ki through a preset program by using a singlechip to realize the measurement of the electrode impedance value; the measuring process comprises the following steps:
the first relay K0 is closed, the second relay K5 is opened, each third relay is controlled to be closed in sequence, and when each third relay is closed, all other third relays are opened;
when the first relay K0 is closed, the constant current source excitation signal current I is led into the Z1 electrode, the electrode signal of the common electrode Zc is led out to the ground, and the detected combined impedance of the Z1 and the Zc corresponds to the monitored voltage Uz1= (Z1+Zc) x I; uz2= (z2+zc) × I, uz 3= (z3+zc) × I, uz 4= (z4+zc) ×i … … Uz (n) = [ Z (n) +zc ] ×i;
the first relay K0 is opened, the second relay K5 is closed, and the third relay K1 is closed, so that the following steps are obtained: uz0= (z1+z2) ×i;
combining the equations to obtain electrode contact impedances Z1, Z2, Z3, Z4 … … Z (n) and Zc corresponding to each electrode;
the program is circulated to measure the impedance values of all the electrodes to be measured in real time.
2. The device for detecting and automatically alarming electrode looseness in electroencephalogram acquisition according to claim 1, wherein the impedance signal extraction processing module comprises a voltage monitoring unit, a voltage signal amplifying and filtering circuit and an A/D conversion circuit;
the output end of the voltage monitoring unit is connected with the input end of the voltage signal amplifying and filtering circuit;
the output end of the voltage signal amplifying and filtering circuit is connected with the input end of the A/D conversion circuit;
the voltage monitoring unit is used for monitoring the voltage generated at two ends of the electrode when the constant current flows through the electrode and transmitting the monitored voltage to the voltage signal amplifying and filtering circuit and the A/D conversion circuit;
the A/D conversion circuit is used for converting the received analog signals into digital signals and transmitting the digital signals to the electrode loosening detection and automatic alarm module.
3. The device for detecting and automatically alarming electrode looseness in electroencephalogram acquisition according to claim 1, wherein the electrode looseness detection and automatic alarming module comprises an impedance display circuit and an automatic alarming circuit;
the impedance display circuit is used for displaying specific values of the impedance of the test electrode;
the automatic alarm circuit is used for alarming when the impedance value exceeds a threshold value.
4. The control method of the electrode loosening detection and automatic alarm device in electroencephalogram acquisition according to claim 1 is characterized by comprising the following steps:
step 1), a constant current source excitation module sends a constant current signal and is excited to a tested person through a test electrode;
step 2), the impedance signal extraction processing module extracts the voltage signal fed back by the tested person, amplifies, filters and A/D (analog to digital) converts the voltage signal, and then transmits the voltage signal to the electrode loosening detection and automatic alarm module;
and 3) after the electrode looseness detection and automatic alarm module receives the processed voltage signal, calculating an impedance value based on ohm law U=IR, displaying the impedance value on an impedance display unit, comparing the impedance value with a threshold value, detecting whether the electrode loosens or not, and commanding an alarm circuit to alarm when the electrode impedance value exceeds the threshold value.
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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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| 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 |
| CN110584657B (en) * | 2019-03-15 | 2022-09-23 | 华为技术有限公司 | Attention detection method and system |
| WO2021155488A1 (en) * | 2020-02-03 | 2021-08-12 | 深圳市汇顶科技股份有限公司 | Contact state detection device and wearable apparatus |
| 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 |
| 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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