JPH01139036A - Bio-potential measuring device and electric treatment device - Google Patents

Abstract

PURPOSE:To measure bio-potential at the time of electric treatment, by mounting a filter circuit for substantially blocking frequency not caused by bio-potential ready to be measured by at least two respective measuring guide means and a differential amplifying circuit wherein an input guide means equipped with said filter circuit is connected to an input terminal. CONSTITUTION:Each of guide means 1, 2 for inputting bio-potential consists of a usual electrode means and a conductor means. Since a current having frequency caused by the treatment current at the time of electric treatment applied simultaneously with the measurement of bio-potential is contained in the current inputted from each of the guide means, filter circuits 3, 4 such as T-type notch filters for blocking the greater part of the frequency caused by said treatment current are mounted. Filter circuits 7, 8 such as low-pass filters for further blocking the frequency caused by a small quantity of the treatment current passing through said filters are mounted. Buffer amplifiers 5, 6 adjust the impedances between the filter circuits 3, 7 and 4, 8. Further, a differential amplifier 12 removes potential the same in a phase to a treatment wave and induced external voltage. A filter circuit 14 such as a ham filter blocks a commercial current of 50Hz or 60Hz.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a novel biopotential measuring device having a specific structure and an electric therapy device connected thereto. More specifically, an improved biopotential measuring device capable of accurately and stably measuring biopotential when using an electric therapy device;
The present invention relates to an electrical therapy device with increased safety that allows treatment to be performed while measuring biopotential.

The present invention particularly relates to chronic bronchitis,
, 1llll bronchitis, bronchial asthma, bronchiectasis.

This is an interference low-frequency electrical therapy device that helps patients with respiratory diseases such as pulmonary tuberculosis and emphysema who have difficulty coughing up sputum.It applies electrical stimulation to the trachea and bronchi in the chest to remove accumulated sputum. This invention relates to a treatment device that facilitates expectoration.

[Prior art] In recent years, chronic bronchitis and bronchial asthma have been increasing due to population growth, aging, and changes in the living environment such as air pollution.

The number of patients with chronic respiratory diseases such as emphysema is on the rise. Phlegm is a symptom associated with these respiratory diseases.

Difficulty in sputum excretion among coughs, shortness of breath, etc. is a frequently encountered symptom in clinical practice, and is one of the main symptoms, along with difficulty in breathing, especially in chronic obstructive pulmonary disease 1, such as chronic bronchitis, bronchial asthma, and emphysema. It becomes. In the treatment of respiratory diseases, it is very important to remove phlegm, which is likely to cause respiratory failure, respiratory tract infection, etc., and methods for removing phlegm include drug therapy and physical therapy.

Known expectorants used in drug therapy include, for example, iodo salts, benzylamines, enzyme agents, cysteine preparations, and allevert. All of these expectorants act directly or indirectly on the rheological properties of sputum, such as its adhesiveness, stringiness, and thixotropy.
Due to the nature of drug administration, side effects are unavoidable and often have an adverse effect on the human body, and there are many cases where drugs are unable to sufficiently remove sputum.

-On the other hand, positional phlegm drainage is known as physical therapy. This treatment involves tilting the patient's entire body or chest so that the sputum is expelled by weight, tapping the chest wall lightly (flapping and tapping), and externally vibrating the chest (vibration). ) to make it easier to cough up sputum. However, while there is less concern about the side effects of the drug therapy, it has the drawback that it is difficult to obtain a sufficient sputum removal effect.

Furthermore, as a type of physical therapy, a method has been proposed in which pressure waves of 10H2 or less are sent directly to the airways and trachea through the airways to promote sputum clearance, but further improvements are needed.

Some of the present inventors have disclosed a completely new physical expectoration method that uses a current therapy device that generates low frequencies to improve respiratory function and/or symptoms (
(Japanese Patent Application Laid-Open No. 60-31766).

In such expectoration methods, it is possible that the electric current during treatment may become too high depending on the user, causing muscle spasm, so it may be necessary to take safety measures to prevent this.

In addition, implementing safety measures not only for this kind of interference low-frequency electric therapy device for expectoration, but also for other electric therapy devices, gives users a sense of security and allows them to receive treatment in a relaxed state with peace of mind. Therefore, it can fully contribute to the spread of electric therapy devices, and it can also be useful in the medical field by making it possible to perform electrophysiological measurements during electric treatment, which has not been possible in the past.

[Object of the Invention] One of the objects of the present invention is to provide a gas potential measuring instrument capable of measuring biopotential during electrical treatment, which has not been possible conventionally. Another object of the present invention is to provide an improved electric therapy device that can ensure safety by feeding back information while measuring biopotential.

[Structure of the Invention] As a result of intensive research to achieve the above object, the present inventors have found that by using a filter circuit and a differential intensifier in combination, the biopotential can be stably maintained even during treatment energization. The present invention has been achieved by discovering that it is possible to measure

That is, the present invention is a biopotential measuring instrument equipped with two or more measurement conductor means, in which a frequency that is not caused by the biopotential to be measured is detected in each of at least two of the measurement conductor means. A biopotential measuring instrument, characterized in that it is equipped with a filter circuit for substantially cutting off, and a differential amplification circuit in which an input conductor means equipped with the filter circuit is connected to an input terminal, and Equipped with current generating means capable of generating one type or two or more types of therapeutic periodic currents with different frequencies, and one or more pairs of therapeutic conductor means capable of passing the circumferential W1 current for treatment. The electrical therapy device comprises a differential amplifier, each of which has at least 2 meters of input conductor means connected to an input terminal, each of which is provided with a filter circuit for substantially blocking frequencies not attributable to the biopotential to be measured. A biopotential measuring device equipped with a width circuit is connected to the current generating means or the treatment guide means at its output terminal side, the biopotential measuring device is provided with means capable of measuring an electrocardial potential, and further means for comparing the measured value by the measuring means with a preset normal value range;
The device is equipped with means for generating an abnormal signal when the measured value falls outside the range of the normal value, and conducts a therapeutic periodic current based on the abnormal signal in the current generating means or therapeutic conductor means. An electrotherapeutic device equipped with means for stopping or reducing t-flow.

It provides:

The present invention will be described in more detail below using drawings as necessary.

FIG. 1 shows a schematic block diagram of a preferred embodiment of the biopotential measuring instrument of the present invention.
indicates conductor means for biopotential input, and such conductor means usually consists of electrode means and conductor means. The current input from each of the conductor means includes frequencies attributable to the therapeutic current in electrical therapy that is being performed at the same time as biopotential measurement, so most of the frequencies attributable to the therapeutic current are A filter circuit 3.4, such as a cut-off T-notch filter, is provided.

A filter circuit N7.8, such as a low-pass filter, is provided to further block frequencies caused by the small amount of therapeutic current that has passed through this filter.

Note that 5.6 is a buffer amplifier for adjusting the impedance between each of the filter circuits 3.7 and 4.8. Furthermore, 12 is a differential amplifier for removing the in-phase potential of the therapeutic wave and the induced external voltage. 14
is a filter circuit such as a hum filter for cutting off commercial current such as 50Hz or 60H2. Further, 18 is a time constant circuit.

Reference numeral 22 denotes an amplifier equipped with gain adjustment means (not shown) for outputting the biopotential. Mana 24 is raw #
This is a potential output terminal. Note that 9.10.16 indicates a buffer amplifier for adjusting the impedance before and after each.

As described above, the biopotential measuring device of the present invention has at least two input conductor means equipped with a filter circuit for substantially blocking frequencies that are not caused by the biopotential to be measured, and such a filter. It is characterized by having a differential amplification circuit in which an input conductor means provided with a circuit is connected to an input terminal.

By combining such a unique filter circuit and a differential input circuit, the biopotential measuring instrument of the present invention can stably measure biopotential in parallel with electrical therapy, which has not been possible until now.

In the biopotential measuring device of the present invention, for example, when measuring biopotential along with treatment using the interference low frequency electric therapy device as described above, the therapeutic carrier wave potential (4 KHz, 1 KHz) is used.
The potential based on bioelectrical phenomena is, for example, about 1/10,000 to 100,000 times smaller than the bioelectric potential (about 0 to 40 V), and the therapeutic carrier wave current is used to detect only the biopotential from among the currents that include both. It is effective to use a filter circuit that substantially removes frequencies caused by Examples of such filter circuits include a 4KHz peak notch filter (-60dB) and a cut frequency of 100H7 (-60dB).
It is desirable to use a high-cut filter of about 246B/act) to block at least most of the carrier waves.In this way, a bandpass filter or a A filter with high attenuation, either alone or in combination with a high-cut filter, etc., is used to block only the frequency of the periodic current for treatment without blocking the frequency of bioelectrical phenomena, and it is possible to eliminate the potential caused by the live wood potential before amplification. It is preferable to have the function of blocking frequencies other than those at frequencies as much as possible.

After passing through the filter circuit for cutting off the frequency of the periodic current for treatment in this way, the input conductor means are connected to the input terminals of the differential amplification circuit, so that the common mode discrimination ratio □ is sufficiently increased to about 80 dB, for example. If the remaining therapeutic wave components are further canceled by increasing the height, bioelectrical phenomena such as electrocardiograms can be measured more accurately and stably.

The raw potential measuring instrument of the present invention is an electrocardiogram (biological potential caused by electromotive force accompanying myocardial activity).

Examples include those capable of measuring at least one type of electromyogram, electroencephalogram, etc. Note that these biopotentials usually refer to potentials on the body surface.

FIG. 2 is a block diagram schematically showing a preferred embodiment of the electric therapy device of the present invention.

FIG. 2 schematically shows a block diagram of an interference low-frequency electrical therapy device for expectoration, which is a preferred embodiment of the electrical therapy device of the present invention. In this figure, 30 and 31 generate carrier wave currents of 4000 Hz and 4070 Hz, respectively, and 32 is an output regulator, and in the present invention, the combination of these is mainly referred to as therapeutic periodic current generating means. There is no particular limitation on what generates the carrier wave current, and for example, two carrier wave oscillators with different frequencies may be used, or a system may be used in which two types of frequencies are generated using phase shifting means. 34 to 37 are conductor means for applying carrier wave current for treatment.

41 and 42 are conductor means for inputting biopotentials such as electrocardiograms, 43 and 44 are band-pass filters for blocking most of the therapeutic carrier waves, and 46 is the in-phase potential (
48 is a high-cut filter for cutting off the remaining carrier wave; 50 is a band-pass filter for cutting off commercial alternating current; 52
is a magnifier. Further, 26 indicates an electrocardiogram output terminal, which is connected to a display device (not shown). 28 indicates means for counting the heart rate, for example, and generating an alarm signal if the heart rate falls within a heart rate range set by external input means (not shown) or in the case of an arrhythmia; However, a buffer amplifier may be provided between the filter circuits 43 and 44 and the differential amplification circuit 46 or in each of the filter circuits 48 and 50 in order to adjust the impedance before and after the filter circuits.

As described above, the electric treatment device of the present invention is equipped with a current generating means capable of generating one type or two or more types of treatment periodic currents having different frequencies. Here, the therapeutic periodic current is desirably one that can provide the intended therapeutic effect and has a frequency that is sufficiently higher than the frequency of the biopotential to be measured.

When the electric therapy device of the present invention is, for example, an interference low frequency electric therapy device for expectoration, it is provided with current generating means for generating two types of carrier wave currents having different frequencies.

As these two types of carrier wave currents, it is easy to obtain an expectorant effect if one having a medium frequency and a frequency difference between the two is 30 to 150 H2, but other carrier wave currents may be used depending on the purpose. .

Here, the medium frequency is preferably on the order of 1,000 Hz, specifically, for example, 3,000 to 5 Hz.
A region of about 000 Hz is practically used.

Especially in practical use, the electrical impedance of human skin is low,
It is easy to conduct electricity to the body, and electric shock to living organisms (
(macro shock) commercial current (50 to 6G)
4) because it has a much higher threshold than fz) and is safer.
A value near 000Hz is used. In addition, it is desirable that the treatment frequency that appears as an interference low frequency is oscillated within the range of 30H2 to 150H7.For example, one carrier wave can be changed to 4000H2+100H2=410 using a phase shifter.
As 0H2, this 4100H2 carrier wave and another 4
A carrier wave of 000 Hz is outputted from two terminals each through two pairs of conductors, and current treatment is performed from four electrodes on the living body, and the expression frequency is 000 Hz. It is preferable to set one pair of the four electrodes on the left chest and left back, and the other pair on the diagonal intersection of the right chest and left back.

As described above, the electric therapy device of the present invention has one or more pairs of conductor means for treatment. A pair of conductor means refers to two conductor means each having an electrode means at its tip, and the conductor means means one or more types of electric current generated by the current generating means for medical treatment. for passing each of the periodic currents to the corresponding electrode means.

The number of such guide means is appropriately selected depending on the purpose of treatment, and is usually used in the range of 1 pair or more and 3 pairs or less. Specific examples include anti-bike-like low frequency waves for one pair, interfering low frequency waves for two pairs, and a combination of these as three pairs. Furthermore, other conductor means may be provided in addition to those forming the pair, if necessary.

The electric treatment device of the present invention is characterized in that a biopotential measuring device is connected to its output terminal side as illustrated in FIG. In particular, the biopotential measuring device is characterized by having a configuration that combines a specific filter circuit and a differential amplification circuit as illustrated in FIGS. 1 and 2.

Examples of such biopotential measuring instruments include those that measure at least one type of electrocardiogram, muscle diagram, electroencephalogram, etc. For example, in the case of the above-mentioned interference low-frequency electric therapy device for expectoration, biopotentials with low frequencies are used. A device that performs measurements related to electrocardiograms and the like is practically advantageous for stable measurements.

In other words, in the case of interference low-frequency electrical therapy devices for the purpose of expectorating sputum in patients with respiratory diseases, the patients often have heart problems as a complication, and electrocardiograms are used to monitor heart movements during treatment. Using these measuring instruments together is very effective in terms of safety measures.

In this case, either the cardiac F4 diagram is directly projected onto a cathode ray tube or the like or recorded and observed, or the pulse is monitored using the acute wave (R parent wave) included in the electrocardiogram waveform as the signal source (trigger signal). Cardiac monitoring can be performed with either. When there is a problem with the heart, such as an abnormal pulse, the abnormal signal can be detected electrically and cured! The safety of the treatment device is further improved by incorporating a circuit that reduces or immediately stops the current.

In particular, when a biopotential measuring device capable of measuring an electrocardiogram is capable of detecting heart rate, the device includes means for comparing the detected heart rate with a normal heart rate range that can be arbitrarily set by an external input means, Furthermore, it is preferable that the device is equipped with means for generating an abnormal signal for stopping or reducing the current for treatment when the detected heart rate falls outside the normal range. Means for reducing the current include, for example, relay circuits and switching circuits, and these means are usually provided in the current generating means and the therapeutic conductor means, but two of them may be provided on the biopotential measuring device. You can.

In the electric therapy device of the present invention in which such a biopotential measuring device is connected to its output terminal side, for example, when the treatment electrode is in a state of poor contact, the biopotential cannot be measured normally and an abnormal signal is generated. By stopping the therapeutic energization or reducing the fa's flow, it is possible to prevent the user from being inadvertently energized.

[Effects of the Invention] The biopotential measuring device of the present invention makes it possible to measure biopotential during electrical therapy, which was not possible with conventional measuring devices.

Furthermore, the electric treatment device of the present invention can perform treatment while measuring biopotential, and feeds back abnormal signals from the measurement to the treatment device, making it possible to perform medical treatment in a state where safety and/or treatment effects are enhanced. It is something.

[Brief explanation of the drawing]

FIG. 1 is a block diagram schematically showing a preferred embodiment of the biopotential measuring device of the present invention, and FIG. 2 is a block diagram of a preferred embodiment of the electric therapy device of the present invention.

Claims (2)

[Claims] (1) A biopotential measuring instrument equipped with two or more measurement conductor means, which substantially blocks frequencies that are not caused by the biopotential to be measured in each of at least two of the input conductor means. 1. A biopotential measuring instrument characterized by comprising a filter circuit for detecting the input conductor, and a differential amplification circuit connecting the input conductor means to an input terminal. (2) Current generating means capable of generating one type or two or more types of therapeutic periodic currents with different frequencies, and one or more pairs of therapeutic conductor means capable of passing the periodic current for treatment. A differential electric therapy device comprising at least two input conductor means connected to an input terminal, the device being equipped with a filter circuit for substantially blocking frequencies that are not caused by the biopotential to be measured. A biopotential measuring device equipped with an amplification circuit is connected to the current generating means or the therapeutic conductor means at its output terminal side, the biopotential measuring device is provided with means capable of measuring an electrocardiogram, and further means for comparing the measured value by the measuring means with a preset normal value range;
The device is equipped with means for generating an abnormal signal when the measured value falls outside the range of the normal value, and conducts a therapeutic periodic current based on the abnormal signal in the current generating means or therapeutic conductor means. An electric therapy device equipped with means for stopping or reducing current.