WO1996005765A1

WO1996005765A1 - Recording apparatus for electroencephalogram and electrocardiograph

Info

Publication number: WO1996005765A1
Application number: PCT/JP1995/001636
Authority: WO
Inventors: Satoko Sato
Original assignee: Satoko Sato
Priority date: 1994-08-23
Filing date: 1995-08-18
Publication date: 1996-02-29

Abstract

A recording apparatus for electroencephalogram and electrocardiogram, which can clearly display electroencephalogram and electrocardiogram waveforms on a CRT of a computer at the same time and directly compare electroencephalogram signals obtained from electrodes with those of a normal man to display the result with a polygonal line graph. The recording apparatus can amplify 12- or 16-channel electroencephalogram signals inputted from the electrodes and an electrocardiogram signal of at least one-channel to remove noises contained in the electroencephalogram signals and electrocardiogram signal for correction into signals of high purity, forward the signals to a personal computer through a digital signal processor for analysis, display electroencephalogram and electrocardiogram waveforms at the same time on the basis of the result, calculate captured measurement data of electroencephalogram and display electroencephalogram with a polygonal line graph where an axis of ordinates represents potential and an axis of abscissa represents portions of the respective electrodes.

Description

Membrane EEG and ECG recording device

The present invention relates to an electroencephalogram and electrocardiogram recording device, and more particularly, to simultaneously display electroencephalogram and electrocardiogram waveforms on the screen of a personal computer so that the functions of the brain and the heart can be simultaneously grasped, and the potential of the electroencephalogram and the electroencephalogram can be obtained. It relates to an EEG recording device that makes it easy to intuitively and visually understand by creating an EEG graph consisting of each electrode part and recording the EEG in the form of a two-dimensional image. is there. Background art

Conventionally, brain waves are generally recorded by inducing changes in the electrical activity of the brain over time derived from electrodes on the scalp, with the potential difference fluctuating on the vertical axis and time on the horizontal axis, approximating a sine wave. It is displayed as a curve. As an actual recording method, the electroencephalogram is a minute electric potential in the unit of uV, so it is greatly amplified by an electroencephalograph, and the amplified electroencephalogram is moved up and down by the pen tip. It is drawn wavy above. This waveform is represented by height (amplitude V) and width (duration, period, milliseconds), and the frequency (cycle) is one cycle.

In order to read brain waves from the waveform recorded as described above, it is generally assumed that the brain waves are drawn with a width of 3 cm for 1 second, so the width of the recorded waveform wave is 3 cm How much you can enter inside The frequency is determined by measuring the frequency with a scale or the like, and the amplitude is determined by measuring the length on the scale and converting it to voltage.

On the other hand, the function of the heart is recorded by measuring the electrocardiogram using an electrocardiograph, and judgment is made by analyzing the obtained results. It is widely known that ECG is a useful record for understanding the function of the heart. An electrocardiogram is an electrical measurement of the heart's excitement and how it is excited, and is represented by waveforms called P waves, QRS groups, and T waves. This is followed by mechanical excitement of the atria and ventricles, ie contraction and dilation. Therefore, the waveform displayed on the electrocardiogram is an electrical view of the heart's excitement process required to cause the heart to move, and the process of excitement.

Conventionally, an ECG is a long recording paper with a firewood line drawn by an electrocardiograph (a graph with a scale, the minimum unit of the scale is 1 mm in length, a small square of 1 mm in height, and a small square between thick lines). (Five squares are squared in), usually 2.5 cm wide per second. Measure the width (milliseconds) and height (amplitude mV) of each wave of P, QRS, ST'T for each beat of the drawn waveform, and measure the heart rate, tuning, and axis deviation. , Hypertrophy, myocardial damage, hard infarction, etc.

However, in order to read the EEG, every page of the recorded EEG must be read, but since it takes time to read all of the many waveforms, the part that represents the overall characteristics of the EEG is read in its entirety. However, accurate reading requires skill, and there are drawbacks in that it is difficult to make quantitative judgments because individual differences occur.

On the other hand, recently, computer-assisted analysis of EEG evoked potentials Some methods have been used to display potentials by pattern or color on a color graphic CRT, but the display is not quantitative, discrimination is inaccurate, and there is an unclear disadvantage.

As a method of solving such a drawback, the present applicant has already disclosed in Japanese Patent Application Laid-Open No. 61-164542 that brain waves are detected as 5, θ, α, a ₂ , β _,, ordinate potential for each frequency band of the beta _2, the horizontal axis Ri by the a child display polygonal line graph of the electrode sites, quantitative, the recording apparatus intuitively EEG that can have a this measure Proposed. This device uses an electroencephalograph, converts the analog signal of the electroencephalogram measured by the electroencephalograph into a digital signal by an interface device, and outputs the digital signal to a personal computer. Thus, the present invention provides an electroencephalogram recording device that calculates the digital signal and displays the graph on a screen.

However, this electroencephalography recording device requires a conventional electroencephalograph, so the device becomes large and complicated.In addition, the analog signal of the electroencephalogram obtained by the electroencephalograph records the electroencephalogram in a wave shape on paper. In addition, the electroencephalograph displays a clear graph of the electroencephalogram on the screen of the personal computer, because the electroencephalography signal obtained by the electroencephalograph differs depending on the model. In order to do so, it is necessary to use an interface device that matches the EEG signal to be captured, and the interface device must be changed to match the model of the EEG to be used. was there.

In addition, the present applicant has improved an electroencephalogram recording device using a conventional electroencephalograph described in Japanese Patent Application Laid-Open No. 61-164452, and No. 9 051 and Japanese Patent Application Laid-Open No. Sho 63-8991 41 The electroencephalogram signal induced from the electrode attached to the scalp is directly introduced into the personal computer via the interface device without using a conventional electroencephalograph, and is displayed as a line graph. We proposed an EEG recording device to be displayed on the screen.

However, this electroencephalogram recording device has the advantage of not using a conventional electroencephalograph.However, it is not possible to simultaneously grasp other biological functions only by recording the electroencephalogram, and if the measurement conditions are poor, the electroencephalography is not possible. There was a disadvantage that external noise was mixed into the signal.

—On the other hand, recently, it is required to grasp not only the function of the brain by electroencephalography but also other biological functions at the same time. For example, by simultaneously grasping the functions of the brain and the heart, it is possible to simultaneously grasp the aging phenomenon of the brain and the activity of the heart, especially in the elderly, which is useful for treatment and the process that leads to the cessation of the function of the brain and heart. Can be grasped at the same time.

However, in the past, EEG and ECG were recorded separately, and ECG had to read each page of ECG recorded by ECG, but it took time to read all of many waveforms. For this reason, the entire characteristic of the waveform is read to understand the overall characteristics.However, accurate reading requires skill, and quantitative judgment is required because individual differences occur. There was a difficult disadvantage.

The present invention has been completed as a result of conducting research in view of such conventional problems, and is a recording device that does not use a conventional large and complicated electroencephalograph or electrocardiograph. To the measurement site on the scalp and chest of the subject, amplify the EEG and ECG signals obtained from the electrodes, and remove the noise contained in the EEG and ECG signals. The signal is corrected to a signal of purity, the brain wave signal and the electrocardiogram signal are selected simultaneously by the switch, and further analyzed by the digital signal processor, and the information is displayed on the CRT of the personal computer. It is an object of the present invention to provide a recording device capable of simultaneously displaying brain waves and electrocardiogram waveforms at the same time and simultaneously capturing brain functions and heart functions.

Further, the present invention selects an electroencephalogram signal from the electroencephalogram signal and the electroencephalogram signal amplified and corrected as described above, further analyzes the electroencephalogram signal with a digital signal processor, and clearly transmits the electroencephalogram to a CRT of a personal computer. _{, θ, aj, α 2,} β γ, the vertical axis potential for each frequency band of beta _0, Ri by the and this horizontal axis is displayed on the polygonal line graph of the electrode sites, give et been from the electrode electroencephalogram A compact device that can directly display signals on a screen and aims to provide a recording device that can measure brain waves quantitatively, intuitively, and accurately. . Disclosure of the invention

The present invention provides an electroencephalogram electrode that is attached to each induction site of the scalp and induces an analog signal of an electroencephalogram signal, a preamplifier that amplifies an analog signal of the electroencephalogram signal captured by the electroencephalogram signal, An electroencephalogram circuit (Α) having electroencephalogram signal correction means for removing distortion of the electroencephalogram signal amplified by the preamplifier;

An electrocardiographic electrode that is attached to each lead site of the chest to induce an electrocardiographic analog signal, and a pre-amplifier that amplifies the electrocardiographic signal captured by the electrocardiographic electrode An electrocardiographic circuit (Β) having an amplifier and an electrocardiogram signal correcting means for removing distortion of the electrocardiogram signal amplified by the preamplifier; An analog switch for connecting the electroencephalogram circuit (A) and the electrocardiogram circuit (B), and an AZD converter for converting an analog signal input from the analog switch into a digital signal And a digital signal processor that takes in digital signals from the AZD converter, controls the interface, and sends data to the personal computer, and digital signal data from the digital signal processor. A personal computer that simultaneously displays the acquired brain waves and electrocardiogram waveforms, calculates the measured data of the acquired brain waves, and displays the brain waves on the vertical axis on the potential and the horizontal axis on the line graph of each electrode site. A recording device for EEG and electrocardiogram characterized by the following.

The apparatus for recording an electroencephalogram and an electrocardiogram according to the present invention amplifies the electroencephalogram signal of at least 12 or 16 channels and the electrocardiogram signal of at least one channel of the electroencephalogram inputted from the electrode. The noise contained in the electroencephalogram signal and the electrocardiogram signal is removed, corrected to a high-purity signal, and sent to a personal computer via a digital signal processor for analysis. Recording or EEG recording is performed automatically.

The electroencephalogram and electrocardiogram recording apparatus of the present invention does not use a large and complicated electroencephalograph or electrocardiograph as in the related art, but attaches electrodes to each measurement site of the examiner's scalp and chest and uses the electrodes. The obtained EEG signal and ECG signal are amplified, and at this time, the noise contained in the EEG signal and ECG signal is removed and corrected to a high-purity signal. Select the signal at the same time Analysis, the brain wave and electrocardiogram waveforms are simultaneously displayed on the CRT of the personal computer clearly, and the brain function and the heart function can be grasped at the same time. Not only can the patient be treated while observing the symptoms, but also the state of the cessation of the functions of the brain and the heart at the end of life.

In addition, the present invention selects an electroencephalogram signal from the amplified and corrected electroencephalogram signal and electrocardiogram signal, analyzes the electroencephalogram signal using a digital signal processor, and clearly transmits the electroencephalogram to a CRT of a personal computer. 5, Θ 'a _{ , α _η , β _{ , β _{2 For} each frequency band, the vertical axis represents the electric potential, and the horizontal axis represents the line graph of each electrode position. This is a compact device that can directly display electroencephalogram signals on a screen, and can measure electroencephalograms quantitatively, intuitively, and accurately.

In addition, since the EEG record is displayed in a line graph, the EEG measurement can be performed accurately and quantitatively, and there is no measurement error caused by a conventional measurer.

In addition, the EEG of a normal person is measured, and a line graph of the EEG of a normal person is created for each waveform based on the potential, based on which a clinical EEG test in the psychiatric field is performed. By comparing the EEG patterns of normal people, the degree of deviation can be compared, and it can be applied not only to treatment of pathological people, but also to examination of the functioning of the brain function of ordinary people and other areas. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing an example of an electroencephalogram and electrocardiogram recording apparatus according to the present invention. FIG. 2 is a diagram showing an example of a graph displaying original waveforms of an electroencephalogram and an electrocardiographic waveform.

Fig. 3 compares the measured data of one subject in the <5 wave band with the graph of normal subjects.

Fig. 4 compares one measurement data of the 0 wave band of the subject with the graph of normal person.

Fig. 5 is a diagram comparing one measurement data of the _Ω- wave band of the subject with that of a normal person.

FIG. 6 is a diagram comparing the one measurement data of alpha ₂ wave band subjects with normal human grayed off.

Fig. 7 is a diagram comparing one measurement data of the subject's ^ i wave band with that of a normal person.

FIG. 8 is a diagram of one measurement data, compared to normal persons graph of 3 _two-wave band of the subject.

Fig. 9 is a diagram in which the S-S graph I I shows the lower frequency band (one measurement data) than the SS graph I.

Fig. 10 shows a graph of a normal person from the SS graph II, comparing the 5-band (one measurement dart) of the subject. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail.

The electroencephalogram and electrocardiogram recording apparatus of the present invention amplifies an electroencephalographic signal of 12 or 16 channels and an electrocardiographic signal of at least one channel of an electroencephalogram input from an electrode. Included in EEG and ECG signals Removes noise and corrects it to a high-purity signal, sends it to a personal computer via a digital signal processor for analysis, and records EEG and ECG waveforms or EEG recordings based on the results. This is a device that automatically performs

FIG. 1 is a block diagram showing an example of an electroencephalogram and electrocardiogram recording apparatus according to the present invention.

This device consists of an electroencephalogram circuit (A) having an electroencephalogram electrode, a preamplifier, and an electroencephalogram signal correction means, and an electrocardiogram circuit (B) having an electrocardiogram electrode, a preamplifier, and an electrocardiogram signal correction means. An analog switch for connecting the electroencephalogram circuit (A) and the electrocardiogram circuit (B), an A / D converter, a digital signal processor (DSP), and an interface. It consists of an issu, a computer, a CRT, a printer, a photostimulator, and data analysis software.

The EEG circuit (A) in FIG. 1 will be described.

An electroencephalogram electrode is attached to a measurement site on the scalp to capture an electroencephalogram signal. In the measurement of the EEG, the EEG electrode is attached by the unipolar induction method with the input of 12 or 16 channels conforming to the international 10-20 method. In addition, commercially available electrodes for electroencephalogram measurement can be used as the electrodes.

According to the present invention, the electroencephalogram is directly measured by using the electroencephalogram electrode without using the conventional electroencephalograph, and in the electroencephalogram measurement, the electrode is attached by a monopolar induction method and an international M10-20 method. FP 1 · FP 2 'F 7-F 8-C 3-C 4' T 5-T 6-0 1 · 02 · FZ · PZ In addition, a contact resistance measuring device that measures the contact resistance (impedance) between the electrode and the scalp, two buffer amplifiers (buffer amplifiers) that remove the distortion of the EEG signal, and a point between two points on the scalp An electrode selector that selects two leads for each channel in order to record the potential of each channel, a calibration device that can generate various calibration voltages based on 50 iV as brain wave signals, etc. Provided.

The contact resistance measurement device and the first buffer amplifier show the probe part.

The analog signal of the electroencephalogram signal captured by the electroencephalogram electrode is amplified by a preamplifier.

In the present invention, since the resistance value of the scalp on which the electrode is mounted is high, an electroencephalogram signal of an extremely low potential of usually several V to several 10 V is taken in from the electrode, but the preamplifier adjusts the electroencephalogram signal. And amplify. As an example of the specifications of the preamplifier,

Impedance 5 Mega Ω

F E T input

Front-back amplification 20 times

Input noise 0.6 V

It is.

In the present invention, the electroencephalogram signal correction means is a circuit for removing the distortion of the electroencephalogram signal amplified by the preamplifier, for example, a hum filter (differential amplifier) and a buffer amplifier (buffer amplifier). Consists of

A hum filter removes in-phase noise such as commercial AC noise (hum). In addition, the EEG signal is transmitted by a buffer amplifier. Excluding noise and distortion other than signal.

It is also possible to provide a light stimulator to apply light stimulus to the examiner at the time of measuring the electroencephalogram and analyze the electroencephalogram signal at that time.

Next, the electrocardiographic circuit (B) will be described.

The electrocardiogram circuit (B) is attached to each lead site of the chest and guides the electrocardiographic analog signal, and amplifies the analog signal of the electrocardiographic signal captured by the electrode. It comprises a preamplifier and an electrocardiogram signal correcting means for removing distortion of the electrocardiogram signal amplified by the preamplifier. Electrocardiographic electrodes are attached by standard 12 leads with 6 limb leads and 6 chest leads. In addition, a commercially available electrode for electrocardiogram can be used. For example, an electrode for electrocardiogram measurement can be used. Electrocardiographic electrodes are attached with one channel input.

The analog signal of the electrocardiographic signal captured by the electrocardiographic electrode is amplified by a preamplifier. The preamplifier adjusts and amplifies the electrocardiographic signal. As an example of the specifications of the preamplifier, those similar to those used for the measurement of the electroencephalogram can be used.

In the present invention, the electrocardiogram signal correction means is a circuit for removing distortion of the electrocardiogram signal amplified by the preamplifier, and includes, for example, a hum filter (differential amplifier) and a buffer amplifier (buffer amplifier). ).

The hum filter removes in-phase noise such as commercial AC noise (hum). In addition, noise and distortion other than ECG signals are eliminated by a buffer amplifier. These can be the same as those used for EEG measurement.

The EEG circuit (A) and the ECG circuit (B) are analog switches Connect with the switch.

An analog switch is a device that takes in analog signals from the electrodes by switching the input of 12 channels of EEG signals and the input of 1 channel of electrocardiographic signals to the input of each channel.

The analog switch can be configured to capture the EEG and ECG analog signals simultaneously, or to capture either the EEG or ECG analog signal.

The programmable amplifier (PGA) corrects for variations in the analog signals of the electroencephalogram signal and the electrocardiogram signal.

Next, the A / D converter converts the electroencephalogram signal and the electrocardiographic analog signal input from the analog switch into digital signals. The AZD converter is connected to a digital signal processor (DSP) via a photocoupler. The digital signal processor captures the digital signal from the AZD converter, controls the interface, and sends the data to the ⁰ -sonal computer.

The interface is connected to a personal computer.

In the present invention, no. One sonal computer is connected to a digital signal processor, can calculate the measurement data sent from the digital signal processor, can simultaneously display the EEG and ECG waveforms, and The measured data is calculated, and the EEG is displayed on the vertical axis as the potential and the horizontal axis on the line graph of each electrode site. —The Sonal computer consists of a computer main unit, color display, keyboard, 10 MB fixed disk device, printer, etc.

The personal computer used in the present invention is not particularly limited and may be a commercially available personal computer. Specific examples thereof include an OA personal computer C-7000D, a memory 256 KB 3 8 4 KB.

Next, the specifications of the personal computer used in the present invention are as follows.

本体 Computer body

Memory capacity ROM 8 Kbytes

R AM 3 8 4 K bytes

Color CRT output 6 4 0 X 4 8 0 Dots ⁰ LESSON door function the same time 8-color display

Printer 1 output 2 4 x 24 4 dot 1 2 0 C P S

Calendar lock internal organs

Power supply AC 100 V ± 10%

Power consumption 0.9 K V A

Weight 23 kg

Size: 4800 (W) x 445 (D) x 165 (H) mm

〇Carardy spray part

Brown tube: 1 2 inch

Display colors: 83 colors including 3 primary colors, 8 colors, and intermediate colors Screen configuration Graphic screen X 9 + text surface power supply AC 100 V ± 10%

Power consumption 90 V A or less

Weight 12 kg

Size 3 2 0 (H) x 4 15 (D) x 3 4 7 (W) With tilt stand

Display characters 80 characters x 2 4 lines x 9 screens

〇 Keyboard

Key layout Standard JIS (with numeric keypad)

Output data JIS 8-bit code (parallel) Weight 2.3 Kg

〇 10 MB fixed disk device

Storage capacity 10 megabytes

Data capacity 1 0 0 0

〇 Printer

Printing speed: 80 characters

Printing method: Dot matrix impact bi-directional printing Number of prints: 80 lines, 66 lines

Power supply: AC 100 V ± 10%

Power consumption: 120 V A

Weight: 16 kg

Size: 570 CW) X 455 (D) x 175 (H) Next, a method for recording an electroencephalogram and an electrogram waveform using the electroencephalogram and electrocardiogram recording apparatus of the present invention. Will be described. First, the EEG signals of the 12 channels input from the EEG electrodes attached to the respective lead sites on the scalp are transmitted through the EEG circuit (A) such as the preamplifier and EEG signal correction means shown in Fig. 1. Import to a personal computer.

The measurement conditions are fixed for one capture time of 5 seconds (4.88 msec x 1024), and the number of capture times is set to 1 to 100 times.

Next, the number of acquisitions was set, and the measured data was transferred from the EEG electrode to the main memory of the personal computer C-700D via the preamplifier and the EEG circuit (A). Is stored in real time.

Number of channels 1 2 channels

Sampling clock 4.8 ms

Number of samples 1 0 2 4 Point notch channel

On the other hand, an electrocardiographic circuit (B) such as a preamplifier and electrocardiogram signal detection means shown in Fig. ) To the personal computer.

The measurement conditions are set so that the time for each acquisition is fixed at 5 seconds (4.88 s x 1 024), and the number of acquisitions is 1 to 6 times.

Next, set the number of acquisitions and store the measurement data in real time from the electrode to the main memory of the personal computer C-700D via the interface device. I do.

Number of channels: 1 2 channels

Sampling clock: 4.8 ms

Number of samplings: 102 4 points / channel In this case, the analog switch is set so that both the electroencephalogram signal and the electroencephalogram signal can be measured. The EEG of one channel and the ECG of one channel are displayed on the screen in real time.

On the other hand, the EEG time series data stored in the main memory is converted into a complex Fourier series by the fast Fourier transform method (FFT), and the power spectrum of the EEG is calculated.

F F T operation precision 32 2-bit

Frequency resolution 05 Hz

Frequency band 0 to 80 Hz

The power spectrum obtained as a result of the calculation is stored on the fixed disk. The power spectrum calculation is performed on the sampled data every 5 seconds, and the work of storing the result is repeated for the set number of times.

When the set number of power vectors is stored, the average power spectrum equally divided by the number of times is displayed on a single screen simultaneously on one or two channels.

The power spectrum is written for each channel and each frequency band in the fixed disk measurement value master file, and the measured value master file is read. 50 V, the horizontal axis is the electroencephalogram of the line graph of the electroencephalogram of each electrode site 1 to 12 channel

Create the S.S graph I I I.

Band classification

δ wave 2.0 to 3.8 Hz

Wave 4.0 to 7.8 Hz

a wave 8.0 to 9.8 Hz a wave 10.0-: I 2.8 Hz

β wave 13.0-: I9.8 Hz

20.0 to 29.8 Hz

Waves

By specifying No. from the menu screen, the measured value master file is read, the potential distribution map and SS graphs I and II are read out, displayed in color on the CRT screen, and hard-copyed to the printer for printing. Perform the following processing.

In this way, the brain waves can be recorded on an electroencephalogram in which the vertical axis is the potential and the horizontal axis is the line graph of each electrode site.

Further, in the present invention, a respiratory waveform can be simultaneously displayed in addition to an electroencephalogram and an electrocardiogram waveform. Specifically, the method from the movement of electrocardiographic electrodes which are attached to the chest captures the movement of the rib cage to display the respiratory waveform by thoracic breathing or by breathing wearing the C 0 ₂ gas measurement sensors in the nostrils, the change in C 0 ₂ gas澳度contained in breath and out and a method of displaying a respiratory waveform. This respiratory waveform can be displayed simultaneously with the electroencephalogram waveform shown in FIG. 2 as a continuous waveform of peaks and valleys together with the electroencephalogram waveform shown in FIG.

[Example]

Next, examples are shown, and the present invention will be described more specifically.

Example 1

Recording was performed using the electroencephalogram and electrocardiogram recorder shown in Fig. 1. The contact resistance measurement device, the first buffer amplifier (buffer amplifier), the second buffer amplifier (buffer amplifier), the electrode selector, An electroencephalogram circuit (A) consisting of a calibration device, a preamplifier, a hum filter (differential amplifier), and a buffer amplifier (buffer amplifier).

An electrocardiogram system that connects a calibration device, a preamplifier, a Ham filter (differential amplifier), and a buffer amplifier (buffer amplifier) in sequence using commercially available electrodes for electrocardiographs. Circuit (B),

An analog switch for connecting the electroencephalogram circuit (A) and the electrocardiogram circuit (B), a program amplifier (PGA), an A / D converter, a photocoupler, a digital signal processor, An interface and a personal computer (Matsushita Electric Industrial Co., Ltd., National, Nogu Nafacom C-700D) are used. The EEG was recorded by the processing procedure shown in Table 1.

No

1 Subject registration

2 Subject data display

3 Original waveform display Start calculation

4 Display of the stick tone graph

5 6 Frequency band simultaneous display (SS graph I)

6 Arbitrary frequency band display (SS graph I I)

7 List of potentials by frequency band

8 S. S Graph I I I I

9 Subjects Ϊ Table printing

1 0 Normal person graph

1 1 Deletion of subject registration

1 2 Date and time setting

1 3 Printer Selection

1 4 End of system

[Processing procedure]

1. Registration of subjects

When menu N 0.1 is selected from the menu screen, the following items are displayed on the screen.

The subject's number, name, date of birth, F · M (gender), and LP are displayed, and they are entered and registered. The data capacity is for 500 people, and one examiner Can record measurement data for four times.

2. Display of subject data

When menu N 0.2 is selected from the menu screen, the subject's number, name, age, month, day, time, 1, 2, 3, 4, NOTE, frequency band name, and frequency band are displayed.

3. Original waveform display Start calculation

Select Menu No. 3 from the menu screen.

Data is automatically collected from the electrodes, the subject's number and name are displayed, the number of counts, and the original waveform (the first one channel) of each part (12 channels + 1 channel). (For 5 seconds) is displayed in real time. Fig. 2 shows an example of a graph displaying the original waveform. In FIG. 2, FP 1, FP 2, F 7, F 8, C 3, C 4, T 5, T 6, 01, 02, FZ, PZ indicate electroencephalogram, and H 1 indicates electrocardiogram waveform .

The number of acquisitions is collected by specifying the number of counts.

Next, the start of calculation and the display during calculation are performed. In the calculation, after taking the signals of all the channels for 5 seconds, the power spectrum is calculated and added to the power spectrum obtained previously. One count for 5 seconds can be calculated up to 100 counts, and any count can be specified. The capture start time is displayed automatically, and the capture end time is displayed automatically.

4. Display of noct graphs

Select menu N0.4 from the menu screen to display the power spectrum graph screen. The result of the power spectrum of the EEG 12 channel is displayed. The vertical axis is compress, the horizontal axis is frequency 0 to 75 Hz, A scale of 5 Hz is displayed. The calculation and count are displayed.

5.5 Simultaneous display of 6 frequency bands

When menu No. 5 is selected from the menu screen, the screen of the subject's 6 frequency bands is displayed at the same time. The average potential of each channel obtained by the above calculation is displayed on a vertical axis as a potential, and the horizontal axis is displayed as a line graph of each electrode portion. A potential distribution chart is displayed for each frequency. In this case, the magnitude of the potential of the power vector is divided into six levels, and each potential is compared and displayed by pattern, and each frequency band (5, Θ, a _{ ^ _α.βχ ^ β) is compared and displayed by color. Delta band (blue): Frequency 2.0 to 3.8Η

Theta band (purple): Frequency 4.0 to 7.8 Η

Alpha band (red): Frequency 8.0 to 12.8

Beta band (green): Frequency 13.0 to 29.8Η

O S. S Graph I

On the menu screen, select F · 8 to switch between displaying and not displaying the normal person graph. Specify Y if you want to display a graph of normal people, N if not.

Normal graphs are automatically displayed according to the age of the subject. The display of the normal person graph is

Minimum to maximum value White vertical line

Average value Thick white line

Is represented by

The average potential of each channel obtained by the calculation is displayed on the vertical axis as a potential, and the horizontal axis is displayed as a line graph of each electrode portion.

Enter a normal person's graph and compare it to the graphs of each age in the 20s to 60s. You can see it. (The graph according to the age is displayed according to the age of the examiner, and the graph according to the age is displayed.)

Frequency band Example _{(5, θ, aj, 2} , ^ j, 6 -frequency band of beta ₂ are displayed simultaneously.

Four measurement results can be displayed: red for the first time, yellow for the second time, yellow for the third time, and blue for the fourth time for comparison. In addition, a normal person graph is displayed on the SS graph I so that the data of the subjects can be compared and examined.

Figures 3 to 8 show the subject's δ, θ, _aι , α. , The data of one measurement of 6 frequency band of beta _0, shows the diagram compared to normal individuals graph.

6. Arbitrary frequency band display

If you select menu .ο.6 from the menu screen, the screen of any frequency band among the 6 frequency bands of the subject will be displayed. The average potential of each channel is indicated by the vertical axis, and the horizontal axis is indicated by a line graph of each electrode portion.

〇 S I

Select F · 8 from the menu screen to switch between displaying and not displaying the normal person graph. Specify Υ if you want to display the graph of normal people, otherwise specify は.

S. S graph I I Ri _{_{5, Θ α χ. A n}} , β 1, 2 of each one of any possible and the view by selecting a frequency band.

The S.S graph II shows a graph of a normal person and allows individual comparison of each of the six frequency bands of the subject. Fig. 9 shows the SS graph II showing the <5 wavebands (one measurement datum) from the SS graph I.

Also, Fig. 10 shows a graph of a normal person from the SS graph II, and a comparison of the subject's five-wave band (one measurement gutter).

7. List of potentials by frequency band

When menu No. 7 is selected from the menu screen, a screen of the measured data values of the 12 channels is displayed for each frequency band. Display a list of potentials for the four subjects.

Table 2 shows a list of potentials for one test subject.

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When menu No. 8 is selected from the menu screen, the vertical axis shows the potential and the horizontal axis shows the time.

The function can be observed by measuring the time course of bioelectric potential. 9. Subject list printing

Select Menu No. 9 from the menu screen.

Pressing the return key prints a list of subjects.

1 0. Normal person graph

Select Menu No. 10 from the menu screen to display the screen of a normal person.

Specify the frequency and register the average, maximum, and minimum values for each of the 12 channels.

1 1. Deletion of subjects

Select menu No. 11 from the menu screen to display the screen. Select No and register the subject's name, date of birth, and gender. Modify or delete.

As described above, the apparatus for recording an electroencephalogram and an electrocardiogram according to the present invention can simultaneously display the original waveform of the electroencephalogram (12 channels) and the original waveform of the electrocardiogram waveform (1 channel) in the original waveform display. It can be displayed, and by continuously observing this screen, it is possible to simultaneously grasp the functions of the brain and the heart.

Therefore, it is possible to perform treatment while grasping the relationship between the brain and the heart and grasping the relationship between the two, and at the end of life, grasping the state of cessation of the function of the brain and the function of the heart at the end of life be able to. Industrial applicability

As described above, the electroencephalogram and electrocardiogram recording device of the present invention can clearly display electroencephalogram and electrocardiogram waveforms simultaneously on a CRT of a personal computer, and can simultaneously capture brain function and heart function. It is possible to perform treatment while grasping the relationship between the two and grasping the functions of the heart and the heart, and at the end of life, the state of the cessation of the function of the brain and the function of the heart.

In addition, the EEG signal obtained from the electrodes can be directly displayed on the vertical axis as potential and the horizontal axis as a line graph of each electrode part on a compact device. It can be measured accurately and can be applied to the examination of the function of brain function.

Claims

The scope of the claims

1. An electroencephalogram electrode that is attached to each induction site of the scalp to induce an analog signal of an electroencephalogram signal, a preamplifier that amplifies the analog signal of the electroencephalogram signal captured by the electroencephalogram signal, An electroencephalogram-based circuit (A) having electroencephalogram signal correction means for removing distortion of the electroencephalogram signal amplified by the preamplifier;

An electrocardiographic electrode which is attached to each lead site of the chest to induce an analog signal of an electrocardiographic signal; a preamplifier which amplifies an analog signal of the electrocardiographic signal captured by the electrocardiographic electrode; An electrocardiographic circuit (B) having an electrocardiographic signal correction means for removing distortion of the electrocardiographic signal amplified by the preamplifier; and further comprising an electroencephalographic circuit (A) and an electrocardiographic system. An analog switch for connecting the circuit (B), an AZD converter for converting an analog signal input from the analog switch into a digital signal, and a digital signal from the A / D converter. A digital signal processor that controls the interface and sends data to the personal computer, and takes in digital signal data from the digital signal processor and captures EEG and ECG waveforms. A personal computer that displays the EEG at the same time, calculates the acquired EEG measurement data, and displays the EEG on the potential axis on the vertical axis and on the line graph of each electrode on the horizontal axis. EEG and ECG recording device.

2. Whether the EEG signal correction means is a hum filter and a buffer amplifier 2. The apparatus for recording an electroencephalogram and an electrocardiogram according to claim 1, further comprising:

3. The apparatus for recording electroencephalogram and electrocardiogram according to claim 1, wherein said electrocardiogram signal correction means comprises a ham filter and a buffer amplifier.

4. The electroencephalogram and electrocardiogram recording apparatus according to claim 1, wherein the AZD converter and the digital signal processor are connected via a photo camera.