JPS6099234A - Portable electrocardiograph - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a portable OJ-enabled heart Vt1i, and more specifically, to a battery-driven electrocardiograph using a liquid crystal display device as an electrocardiogram waveform display device. In addition, the present invention relates to a device equipped with a second liquid crystal display device or a waveform recording device that records electrocardiographic waveforms on recording paper or the like.

BACKGROUND ART Conventionally, battery-powered, single-channel portable electrocardiographs have been known and commercially available for use in emergencies or emergency activities. In addition, the dot matrix of liquid crystal display devices,
Due to advances in miniaturization and high-speed response, it has been used as a display device for portable electrocardiographs (:RT
Liquid crystal displays have become available in place of (cathode ray tubes). However, liquid crystal display devices that can be used as CRTs for electrocardiographs are expensive, such as those with large screens, so a small liquid crystal display device is used. As a result, when the horizontal axis (time axis) of the screen is restricted, the details of the waveform are enlarged, especially when the recording speed is increased, but on the other hand, it is not possible to observe changes in the interval between each heartbeat. will occur.

In order to eliminate the above-mentioned drawbacks, the present invention provides a plurality of liquid crystal display devices and allows each of the liquid crystal display devices to have a different recording speed. A portable electrocardiograph that allows you to observe the details of the waveform and the changes in the interval between each heartbeat using the liquid crystal display device with a slow recording speed, and furthermore, in addition to the liquid crystal display device, the liquid crystal display device The present invention provides a portable electrocardiograph equipped with a waveform recording device that takes a hard copy of the waveform displayed on the device. Hereinafter, the present invention will be explained in detail based on the accompanying drawings. In the embodiments of the present invention, a thermal dot matrix printer is used as the waveform recording device, but other waveform recording devices are also possible.

FIG. 1 Cα1 is a diagram showing the appearance of a conventional portable electrocardiograph using a liquid crystal display device. Electrocardiogram waveform 2 on the surface of case 1
Equipped with a liquid crystal display device 3 for T-display, and a power switch 4 for turning the power ON and OB'F. an attenuator 5 for adjusting the degree of amplification for amplifying the cardiac potential so that the electrocardiographic waveform 2 has an appropriate size within the screen of the liquid crystal display device 3; a waveform stop switch 6 for displaying the waveform on the liquid crystal display device 3;
1 The instrument switch 7 is the same as that provided in general electrocardiographs, not just portable electrocardiographs. In measuring the electrocardiographic waveform, we pay attention to each part of the electrocardiographic waveform shown in Fig. 1b1, that is, the six waves P, Q, R, E, and T shown in the figure, and measure the electrocardiographic waveform '(r!). It is desirable to be able to observe the electrocardiographic waveforms simultaneously at the waveform recording speed of the two series 9, since there are cases where the electrocardiographic waveforms are viewed as a series of electrocardiographic waveforms and observed to see if they are regular rhythms.

FIG. 2 is a diagram showing the back side of a case 1 of a conventional portable electrocardiograph h1, in which electrodes 8°9.10 for detecting cardiac potential are attached to the case 1.

Figure 3 is a diagram showing the appearance of the first embodiment embodying the present invention.On the surface of the case l, there is a first liquid crystal display device]
and a navy blue 2 liquid crystal display device 12't-, and a power switch 4. Attenuator 5 that adjusts the amplification degree of the electrocardiogram waveform
．． It is equipped with a waveform stop switch 6 and an instrument switch 7. The first liquid crystal display device 11 displays an electrocardiographic waveform 53 at a slow waveform recording speed, and the second liquid crystal display device 12 displays an electrocardiographic waveform 14 at a fast waveform recording speed.
By displaying , it is possible to observe the regularity of each heartbeat interval cycle of the electrocardiogram waveform on the first liquid crystal display device 11 and the waveform of each heartbeat on the second liquid crystal display device 12. be.

FIG. 4 is a diagram showing the appearance of a second embodiment embodying the present invention, in which a thermal dot matrix printer 16 (hereinafter referred to as printer 16) is used to hard copy the waveform displayed on the crystalline display device 3. ) and the recording paper roll are installed in the case containing the power switch 4. as in the first embodiment. The printer 16K is equipped with a copy switch 17 for inputting the timing for hard copying the waveform 'e' and a paper feed switch 19 for feeding the recording paper 18.

FIG. 5 shows the printer 16 of FIG. 4, which is an embodiment of the present invention.
't- This is a diagram showing a circuit block diagram of a built-in portable electrocardiograph.The electrode portions of the present invention are the same as those of the conventional portable electrocardiograph, and electrodes 8, 9. 10
to guide the cardiac potential to the circuit of the present invention. Said electrode 8, 9.10
is connected to an ECG amplifier 21 for amplifying the cardiac potential through a coupling capacitor 20 for removing DC signals. An instrumental switch 7 is provided which discharges the charge accumulated in the coupling capacitor 20 by the polarization voltage generated when the electrode 8°9.10't- contacts the human body. An attenuator 5 is provided to attenuate the output voltage of the BCG amplifier and obtain an appropriate electrocardiogram peak value. In addition, 20 unnecessary for electrocardiogram measurement.
Frequency components above 0H2.

The A/D signal is passed through a low-pass filter 22 to attenuate and remove aliasing noise during A/D conversion.
The electrocardiographic signal is input to the D converter 23. Said A/
The output signal of the D converter 23 is sent to the buffer memory 24.
Clock signal 2 stored in 25 and output by the control circuit 26
7.28, the buffer memory outputs data to the liquid crystal display device 3 and printer 16 to display the cardiac potential waveform. The control circuit 26 is a clock generator, which outputs a conversion start signal 29 to the A/D converter 23, and then outputs a clock signal 27 and 28 after a certain period of time has elapsed to transfer the output signal of the A/D converter 23 to a buffer memory. 24. Enter into 25. A clock signal 30f is supplied to the liquid crystal display device 3.

FIG. 6 shows the conversion start signal 29. Clock signal 27.2
8.30 each timing waveform is shown. clock signal 27
The reason why the frequency is 92 times higher than that of the clock signal 28 is because the display speed of the printer 16 is twice that of the liquid crystal display device 3.

The previous month's buffer memories 24 and 25 each constitute a shift register, and are memories that generally perform a so-called first-in first-out operation. The liquid crystal display device 3 also includes a liquid crystal drive circuit, and all bit information of the buffer memory 24 is displayed on the screen. When the control circuit Aha closes the copy switch 17,
After outputting the copy start signal 31, the printer 16 inputs all the data stored in the buffer memory 25 and prints it out. Also, when the paper feed switch 19 is closed,
During this time, a paper feed signal is input to the printer 16 to continue feeding the recording paper.

As described above, in the present invention, by realizing a portable electrocardiograph equipped with a plurality of liquid crystal display devices, a method for displaying electrocardiographic waveforms quickly or slowly on the liquid crystal display device separately, and a method for displaying the electrocardiogram waveforms on the liquid crystal display device are provided. By recording the generated waveform on recording paper using a hard copy device such as a printer, it is possible to observe the electrocardiogram waveform in detail, which has the effect of making diagnosis using a portable electrocardiograph more accurate.

[Brief explanation of drawings]

f141 Fig. 1al is a diagram showing the external appearance of a conventional example, Fig. 1 iMl is a diagram showing a schematic diagram of an electrocardiogram waveform, Fig. 2 is a diagram showing the back external appearance of the conventional and the first embodiment of the present invention, and Fig. 3 The figure is a diagram showing the appearance of the first embodiment of the invention, FIG. 4 is a diagram showing the appearance of the second embodiment of the invention, and FIG. 5 is a circuit block diagram of the second embodiment of the invention. FIG. 6 is a diagram showing the timing of the four-way signal, etc. output by the control circuit in the circuit shown in FIG. 1.15...Case 3, 11.12-1 LCD display device, 4ms power switch, 5. Attenuator, 6
・・Waveform stop switch, 7・・Instrument switch, 8#
9110... Electrode, 16... Thermal dot matrix printer, 17 Self-copy switch, 18- Recording paper, 19-0 Paper feed switch, 20... Coupling capacitor.
24, 25...Buffer memory. Applicant Seiko Electronic Industries Co., Ltd. Agent Patent Attorney Mogami

Claims (1)

[Scope of Claims] (11) A portable electrocardiograph equipped with at least a cardiac potential amplifier, an A/D converter, a power source, and a liquid crystal display device, wherein a plurality of the liquid crystal display devices are provided, and each liquid crystal display device has a different display. [21] A portable electrocardiograph that is characterized by having at least a cardiac potential amplifier, an A/D converter, an electric wire, a liquid crystal display device, and a hard copy device, and a portable electrocardiograph that has a means for performing A portable electrocardiograph, characterized in that it has means for recording a portion of the electrocardiograph on the hard copy device.