JP3487039B2 - Electrocardiograph - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrocardiograph, and more particularly to an electrocardiograph that can be carried by a patient with heart disease and can measure the electrocardiogram itself when an unexpected attack occurs.

[0002]

2. Description of the Related Art Conventionally, various portable electrocardiographs have been developed because they are convenient for grasping the electrocardiographic state in the daily life of persons with heart disease. In the conventional electrocardiograph, when the electrodes provided in the electrocardiograph are applied to the body surface, the electrocardiographic signal is amplified by the differential amplifier, the direct current component is cut by the high-pass filter, and the high-pass signal by the low-pass filter. Noise is cut. Further, after being amplified by the amplifier, it is converted into digital by the A / D converter and recorded in the RAM controlled by the microprocessor. The recorded electrocardiographic signal (electrocardiographic waveform data) is
The sound is pronounced by a speaker, transmitted to a center such as a hospital via a telephone line, and used for diagnosis.

[0003]

By the way, in order to make a more accurate diagnosis on the receiving side, it is necessary to record the electrocardiographic signals at a plurality of measurement sites (leads) of the patient, which is a portable electrocardiograph. In the measurement, the patient applied the electrode to the measurement site with his own hand and recorded the electrocardiographic signal. As the measurement site (lead), chest lead (V1 to V6), limb lead I
(Left hand-right hand), Limb guidance II (Right foot-right hand), Limb guidance
There are a total of 9 places (III (right foot-left hand)). However, on the receiving side, just looking at the received electrocardiographic signal does not tell where the measurement site (lead) was used to measure the electrocardiographic signal. There was a problem that I could not do it. Also,
When measuring at multiple measurement sites (leads), there is a problem that the electrocardiographic signal cannot be memorized or mistaken because it is not known which measurement site.

Therefore, an object of the present invention is to provide an electrocardiograph capable of recording the measured induction of the electrocardiographic signal and making a more rapid diagnosis.

[0005]

In order to achieve the above-mentioned object, an electrocardiograph according to the invention as set forth in claim 1 is provided with a measuring electrode which is brought into contact with a body surface and detects an electrocardiographic signal, and an electrocardiographic signal detected by the measuring electrode. Input means for inputting the induction of the electrocardiographic signal, and storage means for storing the electrocardiographic signal detected by the measuring electrode and for storing the induction input by the input means in association with the electrocardiographic signal. It is characterized by including.

Further, as a preferred mode, for example, as described in claim 2, a display means for displaying the name of the guidance and allowing the name of the guidance to be selected by the input means may be provided.

Further, for example, as described in claim 3, output means for transmitting the electrocardiographic signal stored in the storage means and its lead to an external device may be provided.

Further, for example, as described in claim 4, a low-frequency amplification means for selectively amplifying the amplitude of the low-frequency component of the electrocardiographic signal detected by the measuring electrode may be provided.

Further, for example, as described in claim 5, a pacemaker pulse extracting means for extracting a pacemaker pulse from the electrocardiographic signal detected by the measuring electrode and a pulse width of the pacemaker pulse extracted by the pacemaker pulse extracting means are set. A pulse width acquisition unit for acquiring and a pulse signal having a pulse width acquired by the pulse width acquisition unit are generated, and the pulse signal is added to the electrocardiographic signal detected by the measurement electrode at the generation timing of the pacemaker pulse. A pulse signal generating means to be added may be provided.

In the present invention, the lead indicating the measurement site of the electrocardiographic signal input from the input means is stored in the storage means in association with the electrocardiographic signal detected by the measuring electrode in contact with the body surface. . Therefore, since the measured induction of the electrocardiographic signal is known, it becomes possible to make a more rapid diagnosis based on the electrocardiographic signal and the induction thereof.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described as an example applied to an electrocardiograph with reference to the drawings. A. External Configuration of Electrocardiograph FIG. 1 is a side view showing an external configuration of the electrocardiograph of the present invention in a folded state when being carried, and FIG. 2 is a plan view of the electrocardiograph. Further, FIG. 3 is a bottom view of the concentric electrometer, FIG. 4 is a plan view showing an appearance configuration in a developed state when the concentric meter is used, and FIG. 5 is a bottom view of the concentric meter. The corresponding parts in these figures are designated by the same reference numerals and the description thereof will be omitted. 1 to 5, the outer shape of the electrocardiograph includes a main body 1 and an arm 2. Body 1
Is formed in a thin and flat rectangular parallelepiped shape, and the arm portion 2 is folded over the upper surface 1a of the main body portion 1 with one end portion (left end portion) being connected to the main body portion 1.

The first measuring electrodes 3, 3 are provided on both sides of the main body 1 on the long side, and the upper surface 1a on which the arm 2 is folded and the lower surface 1b on the opposite side are arranged. A display unit 4 is provided for displaying measured electrocardiographic data and stored data such as time and telephone number. The arm portion 2 is attached to the main body portion 1 by cutting one end portion of the main body portion 1 in half to form an arc-shaped hinge piece 1c, and
Similarly, one end of the corresponding arm portion 2 is cut in half to form a hinge piece 2c, and the spring pin 5 is inserted with the hinge pieces 1c and 2c adjacent to each other (see FIG. 1). , FIG. 2 and FIG. 3). As a result, the arm portion 2 rotates about the spring pin 5 to change from the folded state to the expanded state, and the electrocardiogram is measured in the expanded state.

As shown in FIG. 4, the arm portion 2 is provided with a second measuring electrode 6 for measuring electrocardiogram. The second measurement electrode 6 is arranged on the tip side of the arm portion 2, and the electrocardiogram is measured by pressing the measurement electrode 6 against the chest. The second measurement electrode 6 has a predetermined height and projects from the arm portion 2 so as to come into better contact with the chest. As the electrode member,
In order to reduce the feeling of contact with the skin, conductive rubber having elasticity such as karaya rubber is used. Further, as shown in FIG. 4, a concave portion 7 is formed on the upper surface 1a of the main body portion 1 facing the second measurement electrode 6, and the arm portion 2 is formed.
When is folded, the second measurement electrode 6 is housed in the recess 7. As a result, when not in use, the second measurement electrode 6 is not exposed to the outside and dust does not adhere to it, so that accurate measurement can be performed, and since it does not interfere with other members, it can be damaged. Absent. As the first measuring electrode 3, the same material as the second measuring electrode 6 or another material such as metal is used.

As shown in FIGS. 4 and 5, the tip of the arm portion 2 on which the second measuring electrode 6 is disposed enables smooth insertion even if the arm portion 2 is inserted into clothes during measurement. Therefore, it is formed in an arc shape. Further, the display unit 4 is arranged on the lower surface 1b of the main body unit 1 so as to be located on the side opposite to the surface on which the second measurement electrodes 6 are arranged so that the display data can be seen at the time of measurement. (See FIGS. 3 and 5).

Next, as shown in FIGS. 2 and 5, on the side opposite to the second measuring electrode 6, there is provided a speaker sound hole 8 for notifying by sound that the measurement is in progress or the end of measurement. In addition to the above-mentioned purpose, the speaker sound hole 8 is applied to a transmitter of a telephone to be used, and a measured electrocardiographic signal (electrocardiographic waveform data) is transmitted to a hospital as an acoustic signal via a telephone line. It is also used for sending to a medical device (which will be described later) arranged. In addition, the communication unit 9 uses a photocoupler including a phototransistor and a light emitting diode, and attaches an electrocardiograph to a medical treatment device (described later) arranged in a hospital to measure a measured electrocardiogram. Issue directly to the device. As described above, in the hospital, the state of the patient can be grasped by the telephone line or the electrocardiographic signal (electrocardiographic waveform data) directly received.

Next, the first switch 11 shown in FIGS. 1 to 5 is disposed on the side surface of the main body 1 on the other end side,
ON / OFF of electrocardiographic measurement and communication O by communication unit 9
Switch between N and OFF. Further, the second switch 12 and the third switch 13 are arranged on the lower surface of the main body 1, and correct the time, display the stored telephone number or switch to the communication mode, and measure the measurement site. Make settings. A light emitting diode (not shown) is arranged adjacent to the first switch 11 to indicate that the measurement is being performed by light emission. In addition, an electrode jack 15 connected to a commercial power source for charging is arranged on one long side surface of the main body portion 1, and the upper surface 1 of the main body portion 1 is arranged.
In a, a battery lid 1 for inserting and removing a battery (not shown)
6 are arranged. Further, a switch lid 17 for protecting an internal switch (not shown) provided inside the main body 1 is arranged on the lower surface of the main body 1.

B. Internal Configuration of Electrocardiograph Next, FIG. 6 is a block diagram showing the internal configuration of the electrocardiograph according to the embodiment of the present invention. The photo coupler circuit, the power supply jack 15 and the like described above are omitted. The same reference numerals are given to the portions corresponding to those in FIGS. 1 to 5, and detailed description thereof will be omitted. In FIG. 6, the differential amplifier 20
Amplifies the electrocardiographic signal (potential difference) detected by the first measurement electrode 3 and the second measurement electrode 6, and the high pass filter 21
Supply to. The high-pass filter 21 removes the electrocardiographic signal HS from which the DC component of the electrocardiographic signal is removed from the low-frequency emphasis filter 22.
And to the bandpass filter 26 via the analog switch SW. The low-frequency emphasis filter 22 is
The QRS wave of the electrocardiographic signal HS is emphasized (amplified in amplitude) by the P wave and T wave having low frequencies, and is supplied to the amplifier 23 as an electrocardiographic signal HS '. This is because the amplitude of the P wave in the electrocardiographic signal is smaller than that of the QRS wave, and when converting into a digital signal by the A / D converter 24, which will be described later, without increasing the number of bits (resolution), P This is so that the waves can be faithfully reproduced. The amplifier 23 amplifies the electrocardiographic signal HS ′ from which the DC component has been removed and the P and T waves have been amplified, and supplies the electrocardiographic signal HS ′ to the A / D converter 24. The A / D converter 24 converts the electrocardiographic signal HS ′ into a digital signal having a predetermined number of bits, and the control unit 29 described later.
Supply to.

On the other hand, the analog switch SW is the control unit 2
ON / OFF control is performed from 9 according to the control signal CS. Specifically, when the patient using the electrocardiograph uses an artificial pacemaker, the analog switch SW is
When the control signal CS from the control unit 29 becomes active by the key input operation by the patient, it is turned on. The bandpass filter 25 extracts the pacemaker pulse PMP from the electrocardiographic signal HS supplied via the analog switch SW and supplies it to the comparator 26. Comparator 26
Compares the pacemaker pulse PMP with a reference voltage to activate its output for a time corresponding to the pulse width. The timer 27 counts while the output of the comparator 26 is active and supplies the count value T to the control unit 29.

That is, when an artificial pacemaker is used, since the frequency of the pacemaker pulse PMP is high, by passing it through the low-frequency emphasis filter 22 described above,
As shown in FIG. 10B, the pacemaker pulse PMP
Disappears and the ECG signal becomes inaccurate. Therefore, in the present embodiment, when the patient uses an artificial pacemaker, the analog switch SW is turned on and the electrocardiographic signal HS is supplied to the bandpass filter 25.
After the band maker 25 extracts the pacemaker pulse PMP from the electrocardiographic signal HS, the comparator 26 and the timer 27 acquire the pulse width of the extracted pacemaker pulse PMP, and the control unit 29 acquires the rectangular wave P of the pulse width. Are inserted in the electrocardiographic waveform HS ′ in which the P wave and the T wave are emphasized. As a result, even when an artificial pacemaker is used, it is possible to store an electrocardiographic waveform in which the presence and timing of a pacemaker pulse can be recognized.

Next, the key input unit 28 corresponds to the above-mentioned various switches (the first switch 11, the second switch 12 and the third switch 13) and controls the operation state (ON, OFF) of the switches. Supply to the part 29. Control unit 29
Responds to the operation of various switches from the key input unit 28, starts electrocardiographic measurement, supplies various data to the display control unit 31, stores the electrocardiographic signal HS 'in the RAM 30, and controls the sound. The sound data and the measured electrocardiographic signal (electrocardiographic waveform) are supplied to the unit 32. In particular, as the operation according to the present invention, the control unit 29 stores the measurement time and the measured electrocardiographic signal in association with the measurement site (lead), and when transmitting the electrocardiographic signal to the hospital, The measurement site and measurement time are transmitted together with the electric signal (electrocardiographic waveform data). Therefore, at the receiving side (hospital), it is possible to know which measurement site (lead) the electrocardiographic signal is, so that the labor for confirmation and the like is reduced and a quick diagnosis can be performed.

The RAM 30 is a control unit 29 associated with electrocardiographic measurement.
In addition to being used in the work area, the measurement site, the measurement time, the name of the measurement subject (patient), and the like are stored together with the electrocardiographic signal. Specifically, the RAM 30 has the data structure shown in FIG. In FIG. 7, the display register is used to display the display data on the display unit 4. The time register is then used to keep track of the current time. When the patient uses an artificial pacemaker, the count register is used to count the count value T by the timer 27 described above when acquiring the pulse width of the pacemaker. The flag F is used for controlling the operation mode, and becomes “1” when the measurement / storage of the electrocardiographic signal is completed, and becomes “0” when the setting of the measurement site (lead) is completed. The setting data storage unit is used to store the measurement date and time, the name of the person to be measured, the telephone number, and the like. The electrocardiogram waveform data storage unit is used to store the digital data of the measured electrocardiographic signal (electrocardiographic waveform data), and also stores the measurement site and the measurement time in association with the electrocardiographic signal.

Returning to FIG. 6, the display control section 31 controls and drives the above-mentioned display section 4, and supplies stored data such as measured electrocardiographic signals, measurement times, telephone numbers, etc., supplied from the control section 29, or measurement data. When inputting the part, the name of the measurement part is displayed. The display unit 4 is composed of a liquid crystal display or the like. Next, the alarm control unit 32 causes the speaker 33 to generate the pronunciation data from the control unit 29, notifies the measurement completion or the measurement end with a sound, and as described above, causes the speaker 33 to be a transmitter of the telephone. By applying and applying, the measured electrocardiographic signal (electrocardiographic waveform data)
It is also used together with the site data and time data to be transmitted as an acoustic signal via a telephone line to a reading device (described later) of a medical examination device arranged in a hospital.

C. Operation of Embodiment Next, the operation of the electrocardiograph of the above-described embodiment will be described. C-1. During Normal Measurement FIG. 8 is a flowchart for explaining the operation of the electrocardiograph according to the embodiment of the present invention, and FIG. 9 is a waveform diagram showing the measured electrocardiographic signal. First, the person to be measured rotates the arm portion 2 by himself to bring the arm portion 2 from the folded state to the unfolded state, and while holding the first measurement electrodes 3 and 3 of the main body portion 1 with his right hand, The second measurement electrode 6 is pressed against the chest by sliding it through the gap between clothes, and the first switch 11 is operated to start the electrocardiographic measurement.

Steps S10 to S18 described below are
This is a process of storing the electrocardiographic signal HS at a predetermined time.
When the electrocardiographic measurement is started, the potential difference between the first measurement electrode 3 and the second measurement electrode is amplified by the differential amplifier 20 and supplied to the low-pass emphasis filter 22 via the high-pass filter 21. At this time, the low-frequency emphasis filter 22 is set in FIG.
The electrocardiographic signal HS shown in (a) is supplied. Since the low frequency component of the electrocardiographic signal HS is emphasized (amplified by the amplitude) in the low-frequency emphasis filter 22, the amplifier 23 emphasizes the P wave and the T wave as shown in FIG. 9B. An electric signal HS 'is supplied. The electrocardiographic signal HS ′ is amplified to a predetermined level by the amplifier 23, converted into a digital data electrocardiographic signal by the A / D converter 24, and then supplied to the control unit 29.

First, in step S10, the control unit 29 determines whether or not the storage switch (first switch 11) is on, and the storage switch (first switch 1) is determined.
If 1) is on, in step S12, the above A
The electrocardiographic signal (electrocardiographic waveform data) supplied from the / D converter 24 is stored in the RAM 30. At this time, as shown in FIG. 9B, the RAM 30 stores digital data of the electrocardiographic signal (electrocardiographic waveform data) in which the P wave and the T wave are emphasized. Next, in step S14, the electrocardiographic measurement is 10
It is determined whether or not seconds have elapsed, and if 10 seconds have not elapsed, the process returns to step S10. Hereinafter, the memory switch (first
If the switch 11) is turned on, the electrocardiographic signal HS ′ is stored in the RAM 30 for 10 seconds. When the electrocardiographic measurement has passed for 10 seconds, the determination result in step S14 becomes "YES", the process proceeds to step S16, the electrocardiographic signal storage is stopped, and the flag F is set to "1" in step S18.
And Then, the process returns to step S10.

Next, steps S20 to S2 described below
6 is a process of setting at which measurement site (lead) the electrocardiographic signal stored in the RAM 30 by the above-described process is measured. Either switch is operated,
If it is not the memory switch (first switch 11), the process proceeds from step S10 to step S20. In step S20, the operated switch is a setting switch for setting the measurement site (for example, the second switch 12).
Or not. When the setting switch is operated, the process proceeds to step S22, and it is determined whether the flag F is "1". By the above process,
If the storage of the electrocardiographic signal is completed, the flag F is "1". If the flag F is "1", step S2
The process proceeds from step 2 to step S24, and the measurement site of the electrocardiographic signal stored in the RAM 30 is set.

As a setting method, for example, a cursor is displayed on the display unit 4 together with the name of the measurement site (guide name),
With the second switch 12 and the third switch 13,
The cursor may be moved to the name of the corresponding measurement site and the measurement site may be selected. The measurement site selected in this manner is stored in the register described as a site of the RAM 30 shown in FIG. 7 in correspondence with the stored electrocardiographic signal HS ′. At this time, in step S24,
RAM with current time as measurement time corresponding to electrocardiographic signal
A process of storing in 30 is also performed. Next, in step S26, the flag F is returned to "0", and the process returns to step S10.

On the other hand, if the flag F is not "1" even if the setting switch is operated, that is, if the electrocardiographic signal is not stored, the determination result in step S22 is "NO", and the measurement site No settings are made. When a switch other than the memory switch or the setting switch is operated, the process proceeds to other processes through steps S10 and S20.

C-2. When using artificial pacemaker Next, the operation when the patient is using an artificial pacemaker will be described. Here, FIG. 10 is a waveform diagram showing an electrocardiographic signal measured when a patient uses an artificial pacemaker. If the patient is using an artificial pacemaker, the patient should be
A predetermined switch (for example, the third switch 13) is operated. The control unit 29 activates the control signal CS and turns on the analog switch SW according to the predetermined operation. As a result, the electrocardiographic signal HS (see FIG. 10A) output from the high-pass filter 21 is supplied to the low-frequency emphasis filter 22 side and the band-pass filter 25.
Is also supplied to the side. Note that the operation on the side of the low-frequency emphasis filter 22 is the same as the normal operation described above, so a description thereof will be omitted.

In the bandpass filter 25, as described above,
ECG signal HS supplied via the analog switch SW
The pacemaker pulse PMP is taken out from. Then, in the comparator 26, the pacemaker pulse P
By comparing MP with a reference voltage, its output is activated for a time corresponding to the pulse width. Timer 2
7 counts while the output of the comparator 26 is active, and supplies the count value T to the control unit 29. The control unit 29, based on the count value T,
The pulse width of the extracted pacemaker pulse PMP is acquired, and the electrocardiographic signal (see FIG. 10B) in which the P wave and the T wave are emphasized, which is supplied from the A / D converter 24, corresponds to the above pulse width. A rectangular wave P to be inserted is inserted (see FIG. 10C) and stored in the RAM 30.

C-3. Operation on the Receiving Side The electrocardiographic signal (electrocardiographic waveform) HS ′ stored in the RAM 30 by the above-described processing is used by applying the speaker 33 to the transmitter of the telephone together with the measurement site (lead) and the measurement time. , Is transmitted as an acoustic signal via a telephone line, and is received by a medical examination apparatus installed in a hospital. Here, FIG. 11 is a block diagram showing a schematic configuration of the receiving device in the receiving side diagnostic device. In the figure, an electrocardiographic signal HS ′ supplied via a telephone line is converted into a digital signal by an A / D converter 41 controlled by the microprocessor 40 and supplied to a low-pass attenuation filter 42.
The electrocardiographic signal HS ′ has a waveform in which the P wave and the T wave are emphasized, as shown in FIG. 9B. The low-frequency attenuation filter 42 selectively attenuates the low-frequency component of the electrocardiographic signal HS 'to restore the waveform before the low-frequency component is emphasized in the electrocardiograph, and to the circuit in the subsequent stage (not shown). Send out. As a result, on the receiving side, as shown in FIG. 11 or FIG. 9C, the original electrocardiographic signal (electrocardiographic waveform) HS
Can be reproduced, and the measurement site (guidance) and the measurement time are also received, so that a quick and accurate diagnosis can be performed.

As described above, in the above-described embodiment, the measurement site is stored together with the electrocardiographic signal. Therefore, on the receiving side, the measured electrocardiographic signal belongs to which measurement site (lead). Since it is known, the labor for diagnosis can be reduced, and a quick diagnosis can be performed. Also,
Since the P wave and T wave in the electrocardiographic signal are selectively amplified and stored, the weak P wave and T wave can be faithfully reproduced without increasing the number of bits (resolution). Also,
The pacemaker pulse PMP is extracted from the electrocardiographic signal, and the pacemaker pulse PM is added to the electrocardiographic signal at that timing.
Since the rectangular wave P corresponding to P is added, the existence and timing of the pacemaker pulse PMP can be read and the accurate electrocardiographic waveform can be reproduced even when the patient uses the artificial pacemaker. .

[0033]

As described above, according to the present invention,
The following effects can be obtained. (1) Since the lead indicating the measurement site is stored together with the electrocardiographic signal, the receiving side can know which measurement site (lead) the measured electrocardiographic signal belongs to. The time and effort can be reduced and a quick diagnosis can be performed. (2) In addition, the low frequency component of the electrocardiographic signal, P of low amplitude
Waves and T waves are selectively amplified and stored,
Weak P waves and T waves can be faithfully reproduced without increasing the number of bits (resolution). (3) Further, since a pacemaker pulse is extracted from the electrocardiographic signal and a rectangular wave corresponding to the above pacemaker pulse is added to the electrocardiographic signal at that timing, even when the patient is using an artificial pacemaker. , The accurate electrocardiographic waveform can be reproduced, and the existence of the pacemaker pulse and its timing can be read.

[Brief description of drawings]

FIG. 1 is a side view showing an external configuration of an electrocardiograph according to an embodiment of the present invention in a folded state.

FIG. 2 is a plan view of the electrocardiograph according to the present embodiment in a folded state.

FIG. 3 is a bottom view of the electrocardiograph according to the present embodiment in a folded state.

FIG. 4 is a plan view showing an external configuration of the electrocardiograph according to the present embodiment in a developed state.

FIG. 5 is a bottom view of the electrocardiograph according to the present embodiment in a developed state.

FIG. 6 is a block diagram showing an internal configuration of an electrocardiograph according to the present embodiment.

FIG. 7 is a conceptual diagram showing a data configuration of a RAM of the electrocardiograph according to the present embodiment.

FIG. 8 is a flow chart for explaining the operation of the electrocardiograph according to the present embodiment.

FIG. 9 is a waveform diagram showing an electrocardiographic signal measured by the electrocardiograph according to the present embodiment.

FIG. 10 is a waveform diagram showing an electrocardiographic signal measured when a patient uses an artificial pacemaker in the present example.

FIG. 11 is a block diagram showing a schematic configuration of a receiving device in the receiving-side diagnostic device in the present embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 main-body part 2 arm part 3 1st measurement electrode (measurement electrode) 4 display part (display means) 6 2nd measurement electrode (measurement electrode) 20 differential amplifier 21 high-pass filter 22 low-pass emphasis filter (low-pass amplification means) ) 23 amplifier 24 A / D converter 25 band filter (pacemaker pulse extraction means) 26 comparator (pulse width acquisition means) 27 timer (pulse width acquisition means, pulse signal generation means) 28 key input section (input means) 29 control section (Pulse signal generation means) 30 RAM (storage means) 31 Display control section (output means) 32 Notification sound control section (output means) 33 Speaker 40 Microprocessor 41 A / D converter 42 Low-pass attenuation filter SW analog switch

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A61B 5/04

Claims (5)

(57) [Claims] 1. A measurement electrode which is brought into contact with a body surface to detect an electrocardiographic signal, input means for inputting induction of an electrocardiographic signal detected by the measurement electrode, and an electrocardiographic signal detected by the measurement electrode. And a storage unit for storing the lead input by the input unit in association with the electrocardiographic signal. 2. The electrocardiograph according to claim 1, further comprising display means for displaying the name of the lead and allowing the name of the lead to be selected by the input means. 3. The electrocardiograph according to claim 1, further comprising an output unit that sends the electrocardiographic signal stored in the storage unit and its lead to an external device. 4. The heart according to claim 1, further comprising a low frequency amplification means for selectively amplifying the amplitude of the low frequency component of the electrocardiographic signal detected by the measuring electrode. Electricity meter. 5. A pacemaker pulse extracting means for extracting a pacemaker pulse from an electrocardiographic signal detected by the measuring electrode, a pulse width acquiring means for acquiring a pulse width of the pacemaker pulse extracted by the pacemaker pulse extracting means, and Pulse signal generating means for generating a pulse signal having the pulse width acquired by the pulse width acquiring means, and adding the pulse signal to the electrocardiographic signal detected by the measuring electrode at the generation timing of the pacemaker pulse. The electrocardiograph according to any one of claims 1 to 4, characterized in that: