JPH06205751A - Recording system for heart potential - Google Patents

Abstract

PURPOSE:To provide the recording system of the heart potential capable of visually and intuitively grasping the function of a heart without using an electrocardiograph and easy to explain and easy to understand for general people. CONSTITUTION:This recording system of the heart potential is constituted of electrodes fitted to induction portions of a breast to induce the potential of a heart, an interface device converting the analog signals fed from the electrodes into digital signals, and a personal computer receiving the digital signals, calculating the measured data, and analyzing and displaying the deviation from the reference value on a cardio-diagram.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cardiac potential recording apparatus, and in particular, it is possible to intuitively and visually understand the function of the heart by displaying the electrical activity (potential) of the heart in different colors on the heart diagram. The present invention relates to a device for recording a cardiac potential that enables the operation.

[0002]

2. Description of the Related Art Conventionally, the function of the heart was recorded by measuring an electrocardiogram using an electrocardiograph, and the judgment was made by analyzing the obtained result.

It is widely known that the electrocardiogram is a useful record for understanding the function of the heart. The electrocardiogram is an electrical measurement of the excitement of the heart and how to excite the heart, and is represented by waveforms called P wave, QRS complex, and T wave. This is followed by mechanical excitement of the atria and ventricles, namely contraction and dilation. Therefore, the waveform displayed on the electrocardiogram is an electrical view of the excitement process of the heart necessary to cause the motion of the heart and the process of reducing the excitement.

Conventionally, an electrocardiogram is a long recording paper with a ruled line drawn by an electrocardiograph (a graph with a scale, the minimum unit of the scale is a small rectangle with a length of 1 mm and a height of 1 mm, and a small space between thick lines). It is usually drawn with a width of 2.5 cm per second on top of the square. The width (millisecond) and height (amplitude mV) of each wave of P, QRS, ST and T of the drawn waveform are measured for each beat, and heart rate, rhythm, axis deviation, hypertrophy, myocardial disorder, Knowing the infarction.

[0005]

However, in order to read the electrocardiogram, every page of the recorded electrocardiogram must be read, but it takes time to read all of a large number of waveforms. Although the representative part of the characteristics is read and the whole is grasped, there is a drawback that accurate reading requires skill and it is difficult to make a quantitative judgment because individual differences occur. In addition, analysis of an electrocardiogram is very difficult even for an expert, and it is difficult to understand even if a general person shows an electrocardiogram to explain a waveform.

The present invention has been completed as a result of research conducted in view of the above-mentioned conventional problems, and the electrodes are not used in the conventional electrocardiographs, but the electrodes are used at various measurement sites on the chest of the examiner. It is possible to understand the function of the heart visually and intuitively by attaching it to the patient and analyzing the signal obtained from the electrode with the interface device and displaying it on the CRT of the personal computer. It is an object of the present invention to provide a recording device of a cardiac potential that is easy and easy to understand.

[0007]

[Means for Solving the Problems] That is, the present invention provides an electrode that is attached to each induction portion of the chest and induces a potential of the heart, and an interface device that converts an analog signal captured by the electrode into a digital signal. A recording device for a cardiac potential, comprising: a personal computer that captures the digital signal, calculates measurement data, and analyzes and displays a deviation from a reference value on a heart diagram.

The present invention will be described in detail below. The cardiac potential recording apparatus of the present invention sends twelve biological signals input from electrodes to a personal computer through an interface device for analysis, and automatically records the waveform of the cardiac potential from the result. .

FIG. 1 is a block diagram showing an example of a cardiac potential recording apparatus of the present invention. In FIG. 1, the electrodes induce the biopotential of each measurement site, and the induced signals are taken into the interface device as analog signals.

The electrodes are standard 12 leads with 6 limb leads and 6 leads
Attach by one chest lead. In addition, as the electrode, a commercially available one can be used, and for example, an electrocardiographic measurement electrode can be used. Next, an electrode is attached to the measurement site on the chest and connected to the personal computer via the interface device shown in FIG.

When noise is mixed in the signal induced from the electrode, a device for removing the noise, such as a preamplifier, can be provided between the electrode and the interface device.

In the present invention, the interface device has a function of converting an analog signal displayed by the electrode into a digital signal and sending the digital signal to a personal computer. The interface device is a 12CH multiplexer,
It consists of a preamplifier, 12-bit AD converter, intelligent control unit, RS232C unit, etc.

The 12CH multiplexer is a device for switching the 12-channel input to the input for each channel and fetching an analog signal from the electrodes. The switching time is 50 μSEC.

The preamplifier (preamplifier) amplifies the signal taken in by the 12CH multiplexer. 12 bit
The AD converter (AD converter) converts an analog signal obtained from the preamplifier into a digital signal.

The intelligent control unit (data collection control device) controls the 12CH multiplexer to switch the channel and AD
The converter is operated, the data for 12 channels is taken in, and the RS232C unit is controlled to send the data to the personal computer (Panafacom C-7000D).

The RS232C unit is an interface compliant with the RS232C standard and is a connector for connecting the interface device and a personal computer.

Next, an example of specifications of the interface device used in the present invention is as follows: input channel 12 channel input impedance 100 KΩ A / D conversion time 200 μ / sec A / D conversion accuracy 12 bit.

FIG. 2 shows a circuit diagram of the interface device. FIG. 3 is a block diagram showing an example of the control unit of the analog / digital converter. The specifications are as follows: CPU: 8086-2,8 MHz (16 bit) ROM: 96 KByte RAM: 640 KByte (Main memory)
y) FDD: 5 INCH 6.4 MB × 2 ADC: 12 bit input ± 250 mV.

In the present invention, the personal computer is connected to the interface device, calculates the measurement data sent from the interface device, and analyzes and displays the deviation between the measured value and the reference value on the cardiac diagram. As a method of analysis display on the heart diagram, for example, by color, shade of color, ◯,
It can be displayed by the difference in the density of crosses such as x and dots. Among them, the method of displaying by color is particularly preferable.

The personal computer comprises a computer body, a color display, a keyboard, a 10 MB fixed disk device and a printer. A specific example of the personal computer used in the present invention is OA.
Personal computer C-7000D, memory 256
KB to 384 KB can be mentioned.

Next, the specifications of the personal computer used in the present invention are shown below. -Computer main unit Memory capacity: ROM 8K bytes: RAM 384K bytes Color CRT output: 640 x 480 dots Pallet function Simultaneous 8-color display Printer output: 24 x 24 dots 120 CPS Calendar clock: Built-in power source: AC100V ± 10% Power consumption: 0.9KVA Weight: 23Kg Size: 480 (W) × 445 (D) × 1
65 (H) mm

Color display section CRT: 12 inch Display color: 83 including three primary colors, 8 colors, and intermediate colors
Color screen configuration: Graphic screen × 9 + character screen Power supply: AC100V ± 10% Power consumption: 90VA or less Weight: 12Kg Large size: 320 (H) × 415 (D) × 3
47 (W): With tilt stand Number of display characters: 80 characters x 24 lines x 9 screens

〇 Keyboard key layout: Standard JIS (with numeric keypad) Output data: JIS 8 bit code (parallel) Weight: 2.3Kg 〇 10MB fixed disk device Storage capacity: 10 megabytes Data capacity: 1000 people

[Printer] Printing speed: 80 characters / second Printing method: Dot matrix impact bidirectional printing Number of characters: 80 characters / line, 66 lines / page Power supply: AC100V ± 10% Power consumption: 120VA Weight: 16Kg large Sa: 570 (W) x 455 (D) x 1
75 (H) The recording of the cardiac potential is performed by the recording device shown in FIG.

Next, a method of recording a cardiac potential using the cardiac potential recording apparatus of the present invention will be described. FIG. 4 is a flowchart showing a recording method of the cardiac potential. FIG. 4
In the first step, first, the 12-channel biological signal input from the cardiac potential electrode is taken into the personal computer through the interface device.

The measurement conditions are as follows: 1 time acquisition time fixed for 5 seconds (4.88 msec × 1024), 1 times acquisition frequency range
Set to 6 times. Next, the number of times of capturing is set, and the personal computer C is operated from the electrode through the interface device.
Store measurement data in real time in main memory of -7000D. At this time, the calculations are performed simultaneously.

The calculation is performed by using the above-mentioned measurement data (time series data) stored in the main memory by the high-speed Fourier transform method (FF).
It is performed by converting into a complex Fourier series by the T method) to obtain an operation value. (See Tables 4 and 5 below) Number of channels: 12 channels Sampling clock: 4.8ms Number of samplings: 1024 points / channel

The operation of selecting the measurement waveform (1 beat) of each lead (12 leads) is performed a set number of times from the calculated value obtained as a result of the calculation. The measurement waveform selection condition is that the first one of the third (third) beats of the captured waveform is the measurement waveform, but if there is a waveform that is different from the third beat within the set number of times, it is measured waveform. And

Next, when the selection of the measurement waveform is completed, the measurement waveform of one beat of 12 leads is displayed and measured. This measurement value is written in the measurement value master file, this measurement value master file is read and No. is displayed on the menu screen. By specifying, the image is displayed on both sides of the CRT, and a process of printing a hard copy on the printer is performed.

The measured value taken by the examiner is compared with the reference value of the Minnesota code, and the names and comments of heart rate, rhythm, axial deviation, hypertrophy, myocardial injury, infarction, etc. are displayed and their deviations are displayed. Is displayed in color on the electrocardiogram. As a result, the regional function of the heart can be judged visually and intuitively and applied to diagnosis and treatment.

[0031]

EXAMPLES Next, the present invention will be described more specifically by showing examples.

Example 1 A terminal of a commercially available electrocardiograph electrode was connected to the above interface device, and the interface device was connected to a personal computer (National Panafacom C-7000D).
The cardiac potential was recorded by the processing procedure shown in Table 1 and Table 2 using the device connected to.

Table 3 shows the menu No. The outline of is shown.

[0034]

[Table 1]

[0035]

[Table 2]

[0036]

[Table 3]

[Processing Procedure] 〇Registration menu of examiner No. Specify 1 to check the NUMBER / N of the examiner
Enter AME / BIRTHDAY / F / M to register on the floppy disk. In other menus, the inspector's NUM
NAME, AGE, F, M are automatically displayed when BER is input.

Display of examiner data / start of import Menu No. Specify 2 and DATA INPUT O
Input is started by inputting KY / N Y. An arbitrary COUNT number is designated as the acquisition time. 1 COUNT
(5 seconds) If it is canceled during import, press STOP KEY and input Y again to restart.

○ 12-lead original waveform display Menu No. When 3 is specified, the waveform screen is displayed. When the acquisition of an arbitrary set COUNT number is completed, the original waveform of the 1st COUNT (5 seconds) of 12 leads is automatically displayed. The display for the number of set COUNT is COUNT
When 6-1 is changed to 2, 6-10 seconds are displayed.
The COUNT number is in the range of 1 to 6 COUNT (30 seconds).

The calculation waveform is set by analyzing the 3rd beat of each lead (I to V ₆ ) as the reference wave of the examiner from the first display waveform. If there is an abnormal wave from the reference wave in the setting COUNT, Display and analyze abnormal waves. Menu No. 3 lims
b (limb guidance) and chest (chest guidance) can be selected and displayed.

Calculation waveform display Menu No. If you specify 4, the calculated waveform (1 beat) is 12
The guidance is displayed at the same time. DATA OK (Y / N)
Calculation starts at Y. After calculation, limb (LIMD)
・ The chest (CHEST) can be selected and enlarged. Menu No. 4 chests (chest lead) and l
imb (limb guidance) can be selected and displayed.

Calculation result display Menu No. When 5 is specified, the result of comparing the measured value with the reference value of the Minnesota code is displayed. 〇Axis deviation display Menu No. When 6 is specified, the axis deviation is displayed.

Each wall display menu No. When 7 is specified, the front wall, the side wall, the rear wall, and the lower wall are displayed simultaneously. According to the comment, the following five levels are displayed on each wall by color. 1 = Yellow / Normal 2 = Green / Caution 3 =
Blue / Minor anomaly 4 = Pink / Moderate anomaly 5 = Red / Altitude anomaly Each wall can be selected and enlarged. Menu N
o. The front wall, the side wall, the rear wall, and the lower wall of 7 can be selected and displayed.

Calculation value display Menu No. When 8 is specified, the value (average value) of each wave of each lead calculated by the examiner is displayed. As a concrete example
Tables 4 and 5 show calculated values obtained by measuring a 25-year-old boy. Table 4 shows the heartbeat, and Table 5 shows the height (amplitude) of the cardiac potential.

[0045]

[Table 4]

[0046]

[Table 5]

○ Inspector registration deletion menu No. Specify 9 and delete the examiner's data. * Minnesota Code List Menu No. When 10 is specified, the Minnesota code list of the examiner is displayed.

[0048]

As described above, the recording apparatus of the cardiac potential of the present invention can visually and intuitively grasp the function of the heart without using a conventional electrocardiograph and can be generally used. It has an excellent effect that is easy for people to explain and understand.

Further, the recording apparatus of the cardiac potential of the present invention has the following excellent effects because the cardiac potential can be displayed and recorded in different colors on the heart diagram. (1) Since the quantitative and objective display of the cardiac potential is possible, the analysis result of the waveform can be visually and intuitively understood and the cardiac function can be observed.

(2) As a clinical application of the present invention, the cardiac potential of the examiner can be analyzed, the cardiac function can be measured, and the progress of diagnostic treatment compared with the reference value of the Minnesota code can be observed. Also, based on this, a clinical test difference in the cardiology field is performed, and the cardiac potential of the subject is determined from the waveform pattern of a normal person,
It can be applied to not only the treatment of a sick person but also the examination of the functioning of the heart function of an ordinary person and other areas by comparing the deviations.

(3) Since the recording of the cardiac potential is displayed for each color, the waveform can be measured accurately and visually, and the measurement error does not occur by the measurer as in the conventional case. (4) The recording of the cardiac potential can be automatically performed by a program.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a cardiac potential recording apparatus of the present invention.

FIG. 2 is a circuit diagram of an interface device.

FIG. 3 is one of the control units of the analog-digital converter
It is a block diagram which shows an example.

FIG. 4 is a flowchart showing a method of recording a cardiac potential.

Claims (1)

[Claims] 1. An electrode attached to each induction part of the chest for inducing a heart potential, an interface device for converting an analog signal captured by the electrode into a digital signal, and calculation of measurement data by capturing the digital signal. A recording device for a cardiac potential, comprising: a personal computer for performing the above-mentioned operation and analyzing and displaying a deviation from a reference value on a cardiac diagram.