JP3496131B2 - ECG monitor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrocardiogram monitor device which applies an electroencephalogram measurement method, derives and observes an electrocardiogram with a downsized electrocardiogram detector such as a stethoscope, and performs waveform diagnosis and arrhythmia diagnosis.

[0002]

2. Description of the Related Art Conventionally, an electrocardiogram has been an important information source for clinical medical care for diagnosis and treatment of heart diseases such as ischemic diseases and arrhythmias such as chest radiographs.
A standard 12-lead electrocardiograph is generally used as such an electrocardiograph. This standard 12-lead electrocardiograph is one in which electrodes are attached to the left and right hands, the left and right legs, and the chest at six locations to derive an electrocardiogram, and the state of the heart is observed from the X, Y, and Z axis directions. Along with that, they are observing locally in detail. In this observation,
The potential change occurring in any of the hearts appears as a different waveform depending on the difference in the measurement position on the body surface.

As described above, in the electrocardiographic waveform, the cardiac hypertrophy relationship determined by the amplitude of the electrocardiographic waveform, conduction disorder mainly determined by the temporal widening of the electrocardiographic waveform, and myocardium due to the appearance of deformation of a part (Q wave) of the electrocardiographic waveform. Part of infarct or ECG waveform (ST
Diagnosis is made by focusing on the waveform of ischemic heart disease or the like due to a change in the potential level of the (part), but in the electrocardiogram, arrhythmia diagnosis focusing on the rhythm of the rhythm (pulse) is also performed.

In this rhythm diagnosis, it is not necessary to use all the sites (leads) for observing the electrocardiogram. That is, X, Y,
It suffices to use one of the leads corresponding to the Z axis,
The tone of the entire rhythm is more important than the detailed judgment of the waveform such as the rhythm being fast, slow, broken, or drunk. This is where the waveform diagnosis of ischemic heart disease, etc.
This is because it is very different from what is to be understood as what shape the waveform shows and whether there is a slight waveform change.

Further, there are several types of electrocardiographs, and one suitable for the situation is selected and used. Since heart disease can occur suddenly and acutely, examination and observation with an electrocardiograph is not limited to the limited time in the hospital,
Urgent coping that should be possible everywhere when needed, and verification that wants to know the detailed disease state when it is already known that there is some abnormality in the heart due to subjective symptoms etc. There is a treatment. Standard 12-lead electrocardiographs are often used in hospitals. Further, a body surface electrogram meter is used for more detailed measurement, and a portable electrocardiographic device is used for simpler use.

In this body surface electrogram, nearly 100 electrodes are mounted on the body (chest) surface at equal intervals, and the potential of each electrode is detected to display an image (graphic). In addition, the portable electrocardiographic device makes it possible to easily observe the electrocardiogram at any place, and the positive, negative, and reference electrodes on the chest are made triangular, and the electrocardiogram is derived by contacting the body surface as one electrode plate. There is.

In this case, it is important in actual examination of the electrocardiogram that the electrodes are properly attached to the body surface, but it is not easy to derive a stable electrocardiogram mainly due to the influence of the stratum corneum on the skin surface. . For example, when the conductivity is deteriorated in the stratum corneum, the impedance becomes several 100 kΩ or more, which makes it difficult to stably derive the electrocardiogram. Therefore, a conductive jelly agent is applied to the skin surface or physiological saline is soaked into the skin before the electrodes are attached. In addition, the electrocardiogram may be examined by removing the stratum corneum on the skin surface with a paper file. This process is troublesome and is an obstacle to a quick and simple test. Therefore, the required simplicity cannot be solved only by reducing the number of electrodes and reducing the size.

On the other hand, in order to obtain detailed electrocardiogram data, nearly 100 electrodes are attached to the body surface and the body surface potential is measured. However, the area from the heart of the electrocardiogram source to the body surface is surrounded by a good conductor. As a result, electrical diffusion occurs, and even if the number of electrodes for measuring the potential on the body surface is increased, the detection resolution does not improve in proportion to the number of electrodes.

For this reason, improvements have been made to improve the detection resolution. These improvements are basically the same idea as the so-called source derivation method in the EEG field. It should be noted that these methods are not widely used at present because many electrodes must be attached and the inspection data corresponding to the difficulty of this inspection cannot be obtained.

[0010]

In the above conventional example,
When an electrocardiogram signal is derived by contacting an electrode plate with triangular, positive, negative, and reference electrodes on the chest, and the electrocardiogram signal is observed with a portable electrocardiographic device, the heart is placed on the side parallel to the chest. The equivalent potential projected from the vector is amplified by the differential amplifier and detected. Therefore, the electrocardiogram wave shape changes depending on the direction of the electrode plate, that is, the direction of the electrodes indicated by plus and minus, and further, when the distance between the electrodes becomes narrow, the signal level becomes small, and the signal / noise (S / N)
The ratio deteriorates, making it difficult to recognize the waveform.

This indicates that the portable electrocardiographic device is not suitable for waveform diagnosis such as ischemic heart disease and can be used only for arrhythmia observation. Further, there is a limit to downsizing the triangular electrode plate. That is, there is a drawback in that the size of the stethoscope cannot be reduced so that it can be easily carried, and the electrode plate must be set in a fixed direction, which is troublesome and the ECG cannot be detected accurately and reliably.

[0012] Therefore, the conventional portable electrocardiographic device can be used for a disease such as myocardial infarction or ischemic disease which is unknown when and where it suddenly occurs in response to a request to be used at any place and at any time. On the other hand, there is a serious drawback that the waveform diagnosis is difficult and cannot be dealt with immediately.

The present invention solves the problems in the prior art as described above, and applies a known electroencephalogram measurement method to downsize the electrocardiogram measurement like a stethoscope that is easy to carry. Provided is an electrocardiogram monitoring device in which electrodes can be easily attached, an electrocardiogram signal can be accurately and reliably derived, and desired waveform diagnosis and arrhythmia diagnosis can be performed.

[0014]

In order to achieve the above object, the invention according to claim 1 is an electrocardiogram monitor for observing an electrocardiogram detected by an electrocardiogram detector. At least three peripheral electrodes arranged at equal intervals on the circumference of a plane centered on the center electrode and reference electrodes arranged outside the peripheral electrodes extend in the same direction orthogonal to the plane. It was provided by.

According to a second aspect of the present invention, the electrocardiogram monitoring device uses one ring-shaped peripheral electrode arranged on the circumference of the same distance from the center electrode, instead of at least three peripheral electrodes in the electrocardiogram detector. Is.

According to another aspect of the electrocardiographic monitor of the present invention, the center electrode of the electrocardiogram detector is connected to the positive input terminal of the differential amplifier, and the peripheral electrode is connected to the negative input terminal of the electrocardiographic detector. It is connected to a ground terminal and outputs an electrocardiogram data signal that has been differentially amplified.

In the electrocardiogram monitor according to the present invention, the center electrode of the electrocardiogram detector is connected to the plus input terminal of the differential amplifier, and the amplifier and the attenuator are connected in series between the minus input terminal and the peripheral electrode. In addition to being connected, the reference electrode is connected to the ground terminal to output the differentially amplified electrocardiographic data signal.

According to a fifth aspect of the electrocardiogram monitor, a plurality of channels are formed by combining the output terminals in the differential width device between the center electrode and the peripheral electrode in the electrocardiogram detector.

According to a sixth aspect of the present invention, the electrocardiogram monitor device determines the amplification degree in correlation with the distance between the center electrode and the peripheral electrodes of the electrocardiogram detector, and can be changed and exchanged in pairs with the electrodes. .

In the electrocardiogram monitor according to claim 7, the center electrode, the peripheral electrode and the reference electrode in the electrocardiogram detector are
Each of them is provided with an elastic member for elastically displacing in the extending direction while maintaining an equal distance and an equal interval from the center electrode.

In the electrocardiogram monitor according to the present invention, the center electrode, the peripheral electrode and the reference electrode in the electrocardiogram detector have sharp corners for facilitating contact with the skin.

According to a ninth aspect of the present invention, an electrocardiogram monitor device is provided with an electrocardiogram detector which is provided with a wireless transmission section for wirelessly transmitting electrocardiogram data.

The electrocardiogram monitor device according to claims 1, 2, 3 and 4 of this configuration is characterized in that:
At least three peripheral electrodes or one ring-shaped peripheral electrode and a reference electrode are integrally provided at equal intervals and at equal intervals, and the electrocardiogram data in the direction vertical to the body surface from the potential of this electrode through a differential amplifier. You are getting a signal. Therefore, the distance between the electrodes of the electrocardiogram detector can be made extremely short, and the waveform does not change or deform regardless of the orientation of the electrocardiogram detector on the body surface during measurement. Are uniformed and the measurement error is reduced. As a result, the electrocardiogram detector can be downsized like a stethoscope that is easy to carry, and electrodes can be easily attached.
As a result, a waveform similar to the standard chest lead can be accurately (and reliably) derived (detected), and desired waveform diagnosis and arrhythmia diagnosis can be performed.

Further, in the electrocardiogram monitor according to the present invention, the amplification degree is determined in correlation with the distance between the central electrode and the peripheral electrode, and the electrode and the electrode can be changed and exchanged as a pair. An electrocardiogram signal can be accurately and reliably derived according to the physical constitution of children, infants, and the like.

Further, in the electrocardiogram monitor according to the present invention, the central electrode, the peripheral electrode and the reference electrode are individually kept from the central electrode at equal distances within, for example, several tens mm and equal intervals within several tens mm. Since it is elastically displaced in the extending direction, the burden on the subject can be reduced and the skin resistance can be reduced by passing through the stratum corneum of the skin. As a result, the electrodes can be easily attached to the skin, and the electrocardiogram signal can be accurately and reliably derived.

Further, since the electrocardiogram monitor device according to claim 9 is provided with a radio transmitter for radio-transmitting the electrocardiogram data to the electrocardiogram detector, it becomes easy to observe at a distant place like the telemeter method. The convenience of measurement is improved.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an electrocardiogram monitor device of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing the configuration of an electrocardiogram detector in an embodiment of the electrocardiogram monitor device of the present invention. 1A is a top view, and FIG. 1B is a cross-sectional view showing the internal structure. In addition, FIG. 1C is a bottom view. In FIG. 1 (a),
In this electrocardiogram detector 1, a cable 3 is connected to an exterior body 2, and inside the exterior body 2, as shown in detail in FIG. 1 (b), each electrode is integrated as described in detail below. A mounting substrate 4 is provided for the purpose of accurate and accurate placement.

1B and 1C, for example, coil springs 5a, 5b, 5e, and 5f are elastically extended to the outer side of the exterior body 2 and elastically attached to the chest. Position of the contact electrode contact pin (center electrode) 6e provided in the center of the bottom of the exterior body 2 and the contact electrode contact pin 6e, which is equidistant from the function electrode contact pin 6e and whose circumference is equally divided. There are provided indifferent electrode contact pins (peripheral electrodes) 6a, 6b, 6c, 6d arranged in the above and reference electrode contact pins 6f arranged outside the indifferent electrode contact pins 6a to 6d. The reference electrode contact pin 6
A plurality of f may be arranged. Further, the mounting substrate 4 may not be used. That is, the contact electrode contact pin 6
e, as long as the indifferent electrode contact pins 6a to 6d and the reference electrode contact pin 6f can be elastically integrally arranged,
Any structure will do.

FIG. 2 is a block diagram showing the configuration of the electrocardiogram signal processing unit 21 to which the electrocardiogram detector 1 shown in FIG. 1 is connected. In FIG. 2, the electrocardiogram signal processing unit 21 has an electrical configuration similar to that of a known electrocardiograph, and the differential amplifier 10
have. The differential amplifier 10 is provided with connectors 16 and 20 provided at the ends of the cable 3 of the electrocardiogram detector 1 when it is installed in the electrocardiogram monitor device shown in FIG.
It is connected to the related electrode contact pin 6e, the indifferent electrode contact pins 6a to 6d, and the reference electrode contact pin 6f of the electrocardiogram detector 1 through a, and performs differential amplification of the potential.

Further, a time constant circuit 12 using a capacitor or the like to which a reset signal is input, a gain switching circuit 13 for switching the gain with an external gain switching signal, and a low-pass for removing high frequencies such as noise. It has a filter (LPF) 14 and an A / D converter 15 for converting an analog electrocardiogram signal into digital electrocardiogram data.

FIG. 3 is a circuit diagram showing a connection configuration between the electrocardiogram detector 1 and the differential amplifier 10. FIG. 3A is a circuit diagram showing a configuration in which the electrocardiogram detector 1 and the differential amplifier 10 are directly connected, and FIG. 3B is an electrocardiogram detector 1 and the differential amplifier 10.
FIG. 6 is a circuit diagram showing a configuration in which an amplifier is provided between and.

In FIG. 3A, this electrocardiogram detector 1
Is the central contact electrode contact pin 6e and the indifferent electrode contact pins 6a to 6d arranged in the periphery thereof are respectively connected to the plus (+) and minus (minus) input terminals of the differential amplifier 10, and the reference electrode The contact pin 6f is the differential amplifier 10
It is connected to the ground terminal of.

In FIG. 3B, this electrocardiogram detector 1
Are operational amplifiers 8a, 8b, 8c, between the indifferent electrode contact pins 6a to 6d and the negative input terminal of the differential amplifier 10.
8d and 1/4 attenuator (ATT) 8e are provided in series. The central contact electrode contact pin 6e and the central reference electrode contact pin 6f are connected to the positive input terminal and the ground terminal of the differential amplifier 10, respectively. The operational amplifiers 8a to 8d and the 1/4 attenuator 8e may be provided in the differential amplifier 10 in the electrocardiogram signal processing unit 21 instead of being provided in the electrocardiogram detector 1.

The signal amplification from the electrocardiogram detector 1 is performed by the central electrode contact electrode be and the indifferent electrodes 6a to 6 arranged in the periphery.
It is determined that the electrocardiogram detectors 1 are determined in correlation with the distance d, and that there may be electrocardiogram detectors 1 having different distances. For example, in FIG. 3B, the attenuator 8e
Adjust the attenuation amount of.

FIG. 4 is a block diagram showing a configuration of an electrocardiogram monitor device using the electrocardiogram detector 1 shown in FIG.
In FIG. 4, the electrocardiogram monitor device 19 is provided at the end of the cable 3 connected to the waveform monitor device 17 for observing the electrocardiogram data stored here for a fixed time or the electrocardiogram detector 1. Connector 16 is connector 20
connected to a.

Further, the electrocardiogram monitor device 19 receives the I / F circuit 23 to which the digital electrocardiogram data from the electrocardiogram signal processing section 21 is input, and the electrocardiogram data stored in this device through the I / F circuit 23. It has a D / A converter 24 that outputs as an analog signal. Further, a CPU 25 that controls each part, a ROM 26 that stores a control program, a working RAM 27 that stores processing data, and a timer 2 that performs various timing operations.
And 8 are provided. Also, the waveform monitor device 17
It has a connector 20b and a cable 20c for taking in an analog signal from the A / A converter 24.

The electrocardiogram monitor device 19 also includes an LCD I / F circuit 29 for processing display data such as electrocardiogram.
A liquid crystal display (LCD) 30 for displaying a screen of electrocardiogram data and the like, and a key I / F circuit 31 for processing a switching operation signal. Note that each of these units is connected by a bus line. Further, a key 32 for performing various operations related to operations and a constant voltage (+ 5V, -5V,
It has a power supply unit 33 that outputs 0 V) and a rechargeable battery E that serves as a power supply for the electrocardiogram monitor device 19.

Further, a circuit is provided for detecting whether or not the contact state of the electrode is good by detecting an AC signal corresponding to the electrode offset potential or the skin impedance in the ECG detection section or ECG signal processing section 21 which is not shown. There is.

Next, the operation and function of this embodiment will be described. First, the basic principle of the electrocardiogram detector 1 will be described. The electrocardiogram deriving method here is well known as a source derivation method used particularly in the electroencephalogram field. As shown in FIG. 1C, when four indifferent electrode contact pins 6a to 6d are arranged at the same distance from the related electrode contact pin 6e and the circumference divided at equal intervals, the voltage Es ( μV) is approximately represented by the following equation (1). Es = Ec- (E1 + E2 + E3 + E4) / 4 (1) Ec: potentials of the relevant electrode contact pins 6e E1 to E4: respective potentials of the indifferent electrode contact pins 6a to 6d

This detection signal voltage Es is applied to the contact electrode contact pin 6
e, which corresponds to a signal component in the vertical direction with respect to the constituent surface of the indifferent electrode contact pins 6a to 6d. For example, when the configuration of this example is arranged with a large number of electrodes at each fixed part of the head, the potential between the fixed reference electrode contact pin (6f) is calculated to obtain a head potential diagram. This can be applied to a body surface potential diagram of an electrocardiogram performed by placing a zero potential reference electrode on the right foot side.

In this case, as shown in FIG. 1C, the central contact electrode contact pin 6e and the peripheral indifferent electrode contact pins 6a to 6 are formed.
It is required that the distance L1 of each d is constant, and that the interval L2 of each of the indifferent electrode contact pins 6a to 6d be exactly constant. In addition, the size of the electrode (contact area with the skin) is required to be constant. The detection signal voltage Es (μV) increases in proportion to the square of the distance (mm) between the related electrode contact pin 6e and the surrounding indifferent electrode contact pins 6a to 6d up to a certain distance.

Therefore, by taking into consideration the noise level of the differential amplifier 10 in FIG. 2 and setting the signal / noise (S / N) ratio appropriately, the indifferent electrode contact pin 6e and the indifferent electrode in the periphery thereof can be detected. The distance between the contact pins 6a to 6d can be reduced to a few mm. That is, the electrocardiogram detector 1 has a diameter similar to that of an existing stethoscope, for example, 10 mm in diameter.
In addition, it is possible to make the size extremely small. Further, by shortening the distance between the indifferent electrode contact pin 6e and the indifferent electrode contact pins 6a to 6d, the influence of external noise such as AC energization and EMG mixing is reduced, so that the electrocardiogram data output by the differential amplifier 10 is reduced. It becomes possible to prevent the deterioration of the S / N ratio of the signal.

The electrocardiogram detector 1 operates similarly to the chest lead of the standard 12-lead electrocardiograph. In the chest lead of this standard 12-lead electrocardiograph, the chest 4th intercostal sternum right image to the chest 5th intercostal sternum left image are guided in 6 parts to guide the local phenomenon of the heart. It is captured as a signal component in the chest region in the direction perpendicular to the chest. Therefore, when this signal component is detected by the electrocardiogram detector 1,
Similar waveforms are obtained. This is quite different from the conventional triangular electrode detecting a signal component parallel to the chest.

In the detection of such an electrocardiogram signal, as shown in FIG.
As shown in (b), the mounting board 4 is associated with the electrode contact pins 6e,
Indifferent electrode contact pins 6a to 6d and reference electrode contact pin 6f
In comparison with the case where the above-mentioned conventional triangular electrode is arranged, the waveform is not changed or deformed in any direction during measurement of the electrocardiogram detector 1, which is easy to use. Uniformity and waveform are made uniform, and measurement error is reduced.

Further, in this electrocardiogram detector 1, an electrocardiogram signal parallel to the chest is obtained at the same time as a vertical signal on the chest,
When it is desired to capture the three axes of X, Y, and Z, it can be derived as two elements or three elements, as described with reference to FIG. 8 below. As a result, the local phenomenon of the heart can be grasped more widely.

Since the detection signal from the electrocardiogram detector 1 depends on the distance between the center electrode and the peripheral side poles, the electrocardiogram detector 1 is handled separately from the electrocardiogram monitor, or
Considering the case where there are a plurality of types of electrocardiogram detector 1 depending on the application, sensitivity adjustment that correlates with the electrode and its inter-electrode distance by a differential amplifier or other method is performed in pairs with this electrocardiogram detector 1. It must be configured to do so. In this case, for example, both the electrode and the differential amplifier are built in the electrocardiogram detector 1. This is the same when the difference in the distance between the electrodes is corrected equivalently.

FIG. 5 is a cross-sectional view showing a usage state of the electrocardiogram detector 1. In FIG. 5, the electrocardiogram detector 1 is pressed against the skin M of the chest. In this case, the contact electrode contact pin 6e,
Indifferent electrode contact pins 6a to 6d and reference electrode contact pin 6f
However, the elasticity of each of the coil springs 5a to 5f appropriately presses the skin M to detect an electrocardiogram signal.

The contact electrode contact pin 6e, the indifferent electrode contact pins 6a to 6d, and the reference electrode contact pin 6f are made of nickel silver, and the tip of the electrode is sharp enough to break the stratum corneum. For example, the recess is formed in a conical shape, and the periphery thereof is sharply formed, or the center portion is sharpened. Therefore, it becomes unnecessary to apply a conductive paste or the like to the skin, which is conventionally required, and the convenience of use is improved.

Further, the contact electrode contact pin 6e, the indifferent electrode contact pins 6a to 6d, and the reference electrode contact pin 6f are coil springs 5a to 6f so as not to give pain to the subject.
The elasticity of 5f presses the skin appropriately. Therefore, the electrocardiogram detector 1 is miniaturized to a diameter of about 20 to 30 mm like an existing stethoscope, and at the time of measurement, it can contact the respective parts of the chest like the stethoscope and immediately detect an electrocardiogram signal. Simple measurement becomes possible.

In this case, arrhythmia diagnosis requires a relatively long time,
Since detection is performed at the same site, if a protrusion is provided on the contact pin side of the exterior body 2 and this protrusion is fixed with a skin fixing pad with an adhesive material, an electrocardiogram detector can be placed on the chest for a long time. No need to hold 1 by hand,
The convenience is improved.

The operation of the electrocardiogram monitor device 19 using the electrocardiogram detector 1 will be described below. The potentials of the common electrode contact pin 6e and the indifferent electrode contact pins 6a to 6d in the electrocardiogram detector 1 shown in FIG. 3A are input to the differential amplifier 10 with the potential of the reference electrode contact pin 6f as a reference. Moreover, as shown in FIG. 3B, the potentials amplified by the operational amplifiers 8 a to 8 d are input to the differential amplifier 10.

With this structure, the indifferent electrode contact pins 6a to 6d are provided.
Are all short-circuited to input the potential to the negative input terminal of the differential amplifier 10. At this time, the indifferent electrode contact pins 6a-6
Although a waveform error may occur due to a difference in contact impedance between each of d and the skin, it has been found that a practical waveform error does not occur in practical detection. Further, the differential amplifier 10 determines the amplification degree in consideration of the internal noise and the gap between the common electrode contact pin 6e and the indifferent electrode contact pins 6a to 6d.

The electrocardiogram data signal output from the differential amplifier 10 is processed by the electrocardiogram monitor device 19 in the same manner as a conventional electrocardiogram meter. That is, the time constant circuit 12, the gain switching circuit 13, the LPF 14 and the 12-bit A / D converter 15 convert the signal into a digital signal at 500 sampling / second, for example, and the CPU 25 takes in the signal through the I / F circuit 23. CPU25 is R
Control with the control program read from OM26,
Processing corresponding to the operation with the key 32 taken in through the key I / F circuit 31 is performed. For example, LCD I / F circuit 2
The screen of the electrocardiogram data is displayed on the LCD 30 through 9. Further, the electrocardiogram data is stored in the RAM 27.

Further, the electrocardiogram monitor device 19 detects the electrocardiogram QRS wave, calculates it by the CPU 25 to calculate the heart rate, and displays it on the LCD 30. Further, the potential display of ST following the QRS wave is performed. In this case, the stored electrocardiogram data is compared at each measurement time. It is also possible to diagnose, and it is effective in diagnosis for cases such as myocardial infarction that change from moment to moment.

After this, the waveform monitor 17 is connected to the cable 2
0c to connect to the connector 20b, for example, R is a 64K-byte memory capacity for storing electrocardiogram data for 30 seconds
The electrocardiogram data stored in the AM 27 is read out and displayed on the screen.

FIG. 6 is a bottom view showing a modified example of the electrocardiogram detector 1. In FIG. 6A, three indifferent electrode contact pins 41 having the same distance L3 from the electrode contact pin 40 and the equal intervals L4 are provided around the central electrode contact pin 40.
a, 41b, 41c are provided. Further, the reference electrode contact pin 4 is provided outside the indifferent electrode contact pins 41a to 41c.
2 are arranged.

Further, in FIG. 6B, a ring-shaped indifferent electrode contact pin 51 surrounding the objective electrode contact pin 50 at the same distance L5 from the objective electrode contact pin 50 is arranged. Further, the reference electrode contact pin 52 is arranged outside the indifferent electrode contact pin 51. As described above, the related electrode contact pin and the indifferent electrode contact pin can be variously modified. It should be noted that each contact pin has an acute angle portion as described with reference to FIG.

FIG. 7 is a bottom view showing another modification of the electrocardiogram detector 1. In FIG. 7, the electrocardiogram detector 1 is arranged such that the positions of the indifferent electrode contact pins (peripheral electrodes) 6a to 6d, 6i, 6j are different from those of the indifferent electrode contact pins (center electrode) 6e (L1, L3). It was done. In this case, the operational amplifier and the attenuator (ATT) are equivalently modified as shown in FIG.

FIG. 8 is a circuit diagram showing another connection configuration example of the electrocardiogram detector and the differential amplifier. In FIG. 8, this example is for simultaneously detecting bidirectional electrocardiographic signals, and a differential amplifier 10a is provided in the configuration shown in FIG. 3B. In this case, the signal in the vector direction from the peripheral electrode contact pin 6d to the peripheral electrode contact pin 6c is detected through the differential amplifier 10a. Furthermore, by extracting the signal of the peripheral electrode contact pin 6a from the related electrode contact pin 6d through a differential amplifier (not shown), information in the x, y, and z directions can be obtained, and the local phenomenon of the heart can be more widely captured. Like

Since the electrocardiogram detector 1 can be miniaturized, a radio transmitter using a small lithium battery or the like as a power source is provided in the electrocardiogram detector 1 so that it can be used as a so-called telemeter system. .

[0061]

As is apparent from the above description, according to the electrocardiogram monitor device of claims 1 to 4, the electrocardiogram detector is integrally provided with the center electrode, the peripheral electrode and the reference electrode, and the electrodes are integrated. Since the electrocardiogram data signal is obtained from the potential of 1 through the differential amplifier, the waveform is not changed or deformed during measurement, and the waveform is detected uniformly. As a result, the electrocardiogram detector can be downsized like an easy stethoscope, and the electrodes can be easily attached. Therefore, the electrocardiogram can be accurately and reliably derived, and desired waveform diagnosis and arrhythmia diagnosis can be performed.

Further, in the electrocardiogram monitoring device according to the fifth and sixth aspects, since the amplification degree is determined in correlation with the distance between the center electrode and the peripheral electrode, and the pair of electrodes is changed, the electrocardiogram signal is accurate. And it will be possible to reliably derive.

Further, according to the electrocardiogram monitoring device of claims 7 and 8, since the central electrode, the peripheral electrode and the reference electrode are elastically displaced, the electrodes can be easily attached to the skin, and the electrocardiogram can be accurately and surely derived. become able to.

Further, according to the electrocardiogram monitor device of claim 9, since the electrocardiogram detector is provided with the radio transmitter for radio-transmitting the electrocardiogram data, it becomes easy to observe at a remote place like the telemeter system. , The convenience of the measurement will be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an electrocardiogram detector in an embodiment of an electrocardiogram monitor device of the present invention.

2 is a block diagram showing a configuration of an electrocardiogram signal processing unit to which the electrocardiogram detector shown in FIG. 1 is connected.

3 is a circuit diagram showing a connection configuration between an electrocardiogram detector shown in FIG. 1 and a differential amplifier.

FIG. 4 is a block diagram showing a configuration of an electrocardiogram main unit according to the embodiment.

FIG. 5 is a cross-sectional view showing a usage state of the electrocardiogram detector in the embodiment.

FIG. 6 is a bottom view showing a modified example of the electrocardiogram detector in the embodiment.

FIG. 7 is a bottom view showing another modification of the electrocardiogram detector in the embodiment.

FIG. 8 is a circuit diagram showing another connection configuration example of the electrocardiogram detector and the differential amplifier in the embodiment.

[Explanation of symbols]

1 ECG detector 4 mounting board 5a-5f Coil spring 6e, 50 Seki electrode contact pin 6a-6d, 51 Indifferent electrode contact pin 6f, 52 Reference electrode contact pin 8a-8d operational amplifier 8e 1/4 attenuator 10 Differential amplifier 17 Waveform monitor 19 ECG monitor 21 ECG signal processor

Claims (9)

(57) [Claims] 1. An electrocardiogram monitoring device for observing an electrocardiogram detected by an electrocardiogram detector, wherein the electrocardiogram detector is arranged with a center electrode and an equal interval on a circumference of one plane centered on the center electrode. An electrocardiogram monitoring device, comprising: at least three peripheral electrodes and a reference electrode arranged outside the peripheral electrodes, extending in the same direction orthogonal to the one plane. 2. The electrocardiogram detector, in place of at least three peripheral electrodes, one ring-shaped peripheral electrode arranged on the circumference of the same distance from the center electrode is used. The described electrocardiogram monitor device. 3. The center electrode of the electrocardiogram detector is connected to the positive input terminal of the differential amplifier, and the peripheral electrode is connected to the negative input terminal, and the reference electrode is connected to the ground terminal. The electrocardiogram monitor device according to claim 1, wherein the electrocardiogram data signal that has been dynamically amplified is output. 4. The center electrode of the electrocardiogram detector is connected to the positive input terminal of the differential amplifier, and the amplifier and the attenuator are connected in series between the negative input terminal and the peripheral electrode. The electrocardiogram monitor device according to claim 1, wherein the reference electrode is connected to the ground terminal and outputs the electrocardiogram data signal which is differentially amplified. 5. The electrocardiogram monitor device according to claim 3, wherein a plurality of channels are formed by combining output terminals in the differential width device between the center electrode and the peripheral electrodes in the electrocardiogram detector. 6. The electrocardiogram monitor according to claim 3, wherein the amplification degree is determined in correlation with the distance between the center electrode and the peripheral electrodes of the electrocardiogram detector, and the amplification degree is changed in pairs with the electrodes. apparatus. 7. The center electrode, the peripheral electrode, and the reference electrode in the electrocardiogram detector are individually provided with elastic members for elastically displacing in the extending direction at equal distances and equal intervals from the center electrode. The electrocardiogram monitor device according to claim 1. 8. The electrocardiogram monitor device according to claim 1, wherein the center electrode, the peripheral electrode and the reference electrode in the electrocardiogram detector have acute-angled portions for facilitating contact with the skin. 9. The electrocardiogram monitor device according to claim 1, wherein the electrocardiogram detector is provided with a wireless transmission unit for wirelessly transmitting electrocardiogram data.