JP4554197B2 - Electrical stimulator - Google Patents

Description

  The present invention relates to an electrical stimulation device such as a low frequency treatment device.

  Among treatment devices that perform massage or the like on an affected part of a patient using an electrical signal for treatment, there is a low frequency treatment device. This low-frequency treatment device basically applies a low-frequency electrical signal for treatment by bringing an electrode into direct or indirect contact with the vicinity of an affected part of the body surface of a patient. In order to reliably energize the patient body surface with the electrode at a predetermined position, as shown in Patent Document 1, an electrode is disposed in the suction cup, and the suction cup is suctioned using negative pressure. Thus, the suction cup is crimped to the patient body surface. By changing the magnitude of the suction negative pressure in the suction cup, it is also possible to prevent or reduce congestion at the site where the suction cup is crimped while obtaining a massage effect.

  In order to generate a low-frequency electrical signal, there is a voltage signal having a predetermined waveform for a pair of electrodes, which is alternately applied to the plus side and the mass side for each predetermined period of low frequency, In some of these, a predetermined pause time is set between the plus voltage signal and the mass voltage signal so that the voltage becomes zero and the stimulus is paused. More specifically, when the frequency of the low frequency is 10 Hz, every 0.1 second, for example, “applying a positive voltage of 50 μsec → 50 μsec pause time → applying a 50 μsec mass-side voltage” Some have a voltage signal applied.

  The setting of 50 μmsec is a setting when the pair of electrodes is a spike type having a metal protrusion protruding on the surface of the patient body on the surface of the metal plate and is in direct contact with the patient body surface. . On the other hand, when the electrodes are simply flat (the contact area to the patient body surface is large) and the patient body surface is energized via the conductive gel, both the plus side and the mass side are, for example, 200 to 300 μsec. The voltage signal may be continuously applied.

As described above, the voltage is alternately applied to the positive side and the mass side, when only the voltage on the positive side (or the mass side) is applied, negative ions are concentrated around the electrode. This is because the pain is felt at the electrode mounting site due to the above, and the prevention and the fact that the stimulation effect is diminished even if the same voltage signal is continuously applied for a long time. In addition, the predetermined pause time is set between the application of the plus voltage and the application of the voltage on the massus side in order to avoid a sudden change in the plus voltage and the minus voltage. May not be provided (set to 0).
Japanese Utility Model Publication No. 2-55966

  The intensity of stimulation to a patient is generally grasped by the magnitude of the current flowing through the patient, and the total amount of the given stimulation is grasped by integrating (multiplying by time) the magnitude of the flowing current. The Therefore, in order to increase the total amount of stimulation to the patient, it is conceivable to increase (longen) the time during which the predetermined waveform is applied (for example, when the electrode is a spike type, an application of 50 μsec). Increase time to 80 μsec).

  However, if the predetermined waveform is continuously applied for a long time, the electrode mounting site is painful, and it is impossible to adopt a method in which the predetermined waveform is simply continuously applied for a long time.

  The present invention has been made in consideration of the above circumstances, and its purpose is to apply a voltage signal having a predetermined waveform to a pair of electrodes mounted on the surface of a patient body at a predetermined period and a positive side and a mass side. The present invention is to provide an electrical stimulation device which can obtain a larger stimulation amount without giving pain to an electrode mounting site by devising the predetermined waveform when alternately applied to the electrode.

In order to achieve the above object, in the present invention, basically, when a voltage of the same magnitude is continuously applied, a large current flows at the initial stage, that is, a peak current is obtained. After that, focusing on the fact that only a relatively small constant current flows, the predetermined waveform is set to a shape that can obtain an initial state where a large current flows a plurality of times. Specifically, the following solution is adopted in the present invention. That is, as described in claim 1 in the claims,
In the electrical stimulation device which is configured to alternately apply a voltage signal having a predetermined waveform to the plus side and the mass side for each pair of electrodes with respect to the pair of electrodes mounted on the patient body surface.
The predetermined waveform is constituted by a plurality of divided waveforms so as to include a short pause time during which stimulation is paused when the voltage is 0,
The predetermined waveform is composed of two divided waveforms having only one short pause time,
Of the two divided waveforms, the first divided waveform is set to have a shorter time than the latter divided waveform,
Between the positive voltage signal and the mass signal voltage signal, a predetermined pause time is set at which the voltage is 0 and the stimulus is paused,
The short pause time is set to be shorter than the predetermined pause time;
The time for which the pre-divided waveform is given is set to 15 μsec to 25 μsec,
The time for which the post-divided waveform is given is set to 40 μsec to 60 μsec,
The time that the pre-divided waveform is given is set to be substantially the same as the short pause time,
When showing the integrated values obtained by integrating the magnitude of the flowing current as a current amount, the total current amount of the current amount given by the following division waveform and current amount given in the previous division waveform, It is configured to be larger than the amount of current obtained when the predetermined voltage is continuously applied during the total time of the time when the pre-divided waveform is given and the time when the post-divided waveform is given.
That ’s it.

According to the above solution, when an electric signal having a predetermined waveform is applied, a plurality of large peak currents corresponding to the number of the plurality of divided waveforms can be obtained, and the amount of stimulation corresponding to the large peak current generated after the second time is obtained. Can be increased. In addition, since a short pause time is set immediately after one divided waveform is given, it prevents a situation in which pain is given to the electrode mounting site and appears at the initial time when the next divided waveform is output. This is preferable for effectively generating the peak current. In addition to the above, by setting the predetermined pause time, it is possible to prevent a situation in which the time for outputting the predetermined waveform becomes unnecessarily long while preventing the voltage from being suddenly changed between the plus side and the mass side. The In addition, it is preferable to prevent the entire time during which the predetermined waveform is given from becoming too long. Further, it is preferable to lengthen the time of the post-divided waveform and secure a time for giving sufficient electrical stimulation continuously. Furthermore , it is possible to satisfy both the prevention of the time of the entire predetermined waveform from becoming too long while ensuring a longer time for the current to actually flow through the predetermined waveform than in the past. This is preferable for preventing the time from becoming excessively long.

A preferred mode based on the above solution is as described in claim 2 and the following claims. That is,
The pair of electrodes is configured to be a spike type having a metal protrusion protruding on the surface of the patient body on the surface of the metal plate (corresponding to claim 2). In this case, a specific pair of electrodes suitable for use in the present invention is provided.

The time when the post-divided waveform is given can be set to be substantially the same as the predetermined pause time (corresponding to claim 3). In this case, it is preferable to secure a time for applying the electrical stimulation continuously and sufficiently by the post-divided waveform while considering the predetermined pause time.

Each of the divided waveforms may be a rectangular wave (corresponding to claim 4 ). In this case, a plurality of divided waveforms constituting the predetermined waveform are generated using a rectangular wave in the same manner as in the prior art, which is preferable in terms of effectively using the conventional apparatus.

The low frequency electrotherapy apparatus can be configured such that the predetermined period is a low frequency (corresponding to claim 5 ). In this case, the low frequency treatment device using the predetermined waveform in the present invention is provided.

  According to the present invention, the amount of stimulation given by the predetermined waveform can be made larger than before without giving pain to the electrode mounting site.

  In FIG. 1, K is a patient and TC is a low frequency treatment device. In FIG. 1, two pairs of suction electrodes (suction electrode devices) D are attached to the arm of a patient K. A therapeutic voltage signal (electrical signal) is applied to the pair of suction electrodes D from the low frequency treatment device TC via the cable C, and the region between the pair of electrodes D (particularly, the electrode mounting region) is applied. Treatment is performed. The cable C has a hollow structure and also has a function of transmitting the suction negative pressure from the low frequency treatment device body TC to the suction electrode D.

  In the embodiment, the pair of electrodes D is a spike type having a metal protrusion protruding on the surface of the patient body on the surface of the metal plate. More specifically, the metal plate and the protrusion are made of stainless steel, and the surface thereof is plated with silver to sufficiently increase the conductivity. And the said metal plate and protrusion part shall be directly contacted with a patient body surface surface.

  An example of a voltage signal for low frequency treatment applied to the pair of electrodes D will be described with reference to FIG. In FIG. 2, the above spike type is used as the pair of electrodes D. First, FIG. 2A shows a voltage signal output from the low frequency treatment device TC. This voltage signal outputs a predetermined waveform alternately between the plus side (t0 to t3) and the mass side (t4 to t7), and a predetermined pause between the plus side output and the mass side output. Time (t3 to t4, after t7) is set. In other words, a low-frequency voltage signal having a cycle of “plus-side output of a predetermined waveform → predetermined pause time → mass-side output of a predetermined waveform → predetermined pause time” is output to the pair of electrodes D.

  The predetermined waveform for constituting the voltage signal has two divided waveforms consisting of rectangular waves, that is, a pre-divided waveform (t0 to t1) and a post-divided waveform (t2 to t3). It is configured that a short pause time (t1 to t2) is set between In the embodiment, as shown in FIG. 2A, the time of the pre-divided waveform is set to be shorter than the predetermined pause time (t3 to t4) and substantially the same as the short pause time. . The time of the rear divided waveform is set to be longer than the time of the previous divided waveform and substantially the same as the predetermined pause time. More specifically, in the embodiment, the time of the previous divided waveform is set to 20 μsec, the short pause time is 20 μsec, the time of the rear divided waveform is set to 50 μsec, and the predetermined pause time is set to 50 μsec. Each time described above is set based on the premise that the time is rested for the same time as the time for which stimulation is continuously applied (voltage 0).

  Note that the signal waveform on the manas side between t4 and t7 is simply the reverse of the plus / mass relationship with respect to the signal waveform on the plus side, so the duplicated explanation is omitted (time t4 corresponds to time t0). Thus, when the phase is shifted so that t4 overlaps t0, the predetermined waveform on the plus side and the predetermined waveform on the manus side are symmetrical with respect to the voltage 0).

  From the time t0 to the time in FIG. 7 is one cycle for outputting the predetermined waveform to the plus side and the mass side, and after t7 is a waiting time until the next one cycle is output (the waiting time is set). Is changed by a predetermined period). That is, when the predetermined cycle is 10 Hz, for example, a voltage signal as indicated by t0 to t7 is applied every 0.1 second.

  When the predetermined waveform is applied to the pair of electrodes D in the manner shown in FIG. 2, the actual change in the voltage flowing is as shown in FIG. 2B, and the actual change in the current flowing in FIG. It becomes like this. As apparent from the change in current in FIG. 2C, after a large peak current (first peak current) flows immediately after the pre-divided waveform is given at time t0, the current value gradually decreases, The current value becomes 0 at time t1, which is the end time of the previous divided waveform. The current value is maintained at 0 during the short pause time t1 to t2. A post-divided waveform is given at time t2, and a large peak current (second peak current) flows immediately after that. However, the second peak current is slightly smaller than the first peak current. After the second peak current flows, the current value gradually decreases and becomes a substantially constant current value, and this substantially constant current value is continued until time t3 which is the end time of the post-division waveform.

  The current value is set to 0 during a predetermined pause time from time t3 to time t4. At time t4, which is the end time of the predetermined pause time, the above-mentioned predetermined waveform is given to the massus side, and the current flow itself at that time is a plus-massane of the state between t0 and t3. Only the relationship is reversed.

  Here, it is assumed that the above-described predetermined waveform is deformed and a comparative waveform without a short pause time (t1 to t2) is present (the comparative waveform is continuously applied between t0 and t3). In the case of this comparative waveform, a substantially constant current value at the time t2 to t3 flows from the time t1 to the time t2, and the stimulation is given also at the time t1 to t2, so that a large stimulation is obtained. This is advantageous. However, in this case, since the voltage is continuously applied for a long time from t0 to t3, the second peak current cannot be obtained, and it is a fact that the site where the electrode D is attached is painful. It cannot be adopted.

  On the other hand, according to the signal waveform of the present invention, the actual voltage application time is the total time of t0 to t1 and t2 to t3. In this case, the second peak current cannot be obtained when the voltage is simply applied continuously for this total time. In other words, according to the predetermined waveform in the present invention, even if a voltage is applied for the same time, a large stimulus can be given by the amount that the second peak current is obtained.

  Here, the time of the pre-divided waveform is preferably set to 15 to 25 μsec. The setting of 15 μsec or more is a time required to sufficiently secure the first peak current. If the time is shorter than this, a short pause time may be entered while the first peak current is still occurring. become. This is because the setting of 25 μsec or less can obtain only a small and substantially constant current value (a constant current value immediately before the time point t3) even if the time is longer than this. The short pause time (t1 to t2) is to effectively obtain the second peak current at the initial time when the post-divided waveform is given.

  The time (t2 to t3) of the rear division waveform is set to be approximately the same as the predetermined pause time (t3 to t4) to prevent a situation in which the voltage is suddenly changed between the female S place and the Masnus side. Buffering time. Prolonging the time of the post-partition waveform may cause the subsequent predetermined pause time required for pain prevention to be too long, or may cause pain within the time of the post-partition waveform (before the predetermined pause time). It can also be a situation. From such a viewpoint, it is preferable to set the time of the post-divided waveform as long as possible within a range in which no pain is given during this period. From such a viewpoint, it is preferable to set the time in the range of 40 to 60 μsec.

Of the predetermined waveforms, the total time of the pre-divided waveform and the post-divided waveform, which is the voltage application time, is too short, so that only the same amount of stimulation as in the conventional case can be obtained. The other hand, too much increase the total time of the pre-divided waveform and the rear split waveform, since the time of the entire predetermined waveform too long, preferably 100μsec less, more preferably Ru is set below 90Myusec.

  The present invention can be applied to an electrical stimulation device of a low frequency treatment device.

The figure which shows the low frequency treatment device as an electrical stimulation apparatus. The figure which shows the relationship between the voltage signal for control (predetermined waveform), an actual voltage, and an actual electric current.

TC: Low frequency treatment device (electric stimulation device)
D: Electrode K: Patient t0 to t1: Time t1 to t2 of the pre-divided waveform: Short pause time t2 to t3: Time t3 to t4 of the post-divided waveform: Predetermined pause time t0 to t3: Output time on the plus side of the predetermined waveform t4 to t7: the output time of the predetermined waveform on the manas side

Claims (5)

In the electrical stimulation apparatus that is configured to alternately apply a voltage signal having a predetermined waveform to the plus side and the mass side for each pair of electrodes with respect to a pair of electrodes mounted on the patient body surface
The predetermined waveform is constituted by a plurality of divided waveforms so as to include a short pause time in which the voltage is 0 and the stimulus is paused,
The predetermined waveform is composed of two divided waveforms having only one short pause time,
Of the two divided waveforms, the first divided waveform is set to have a shorter time than the latter divided waveform,
Between the voltage signal on the plus side and the voltage signal on the mass side, a predetermined pause time is set at which the voltage becomes 0 and the stimulus is paused,
The short pause time is set to be shorter than the predetermined pause time;
The time for which the pre-divided waveform is given is set to 15 μsec to 25 μsec,
The time for which the post-divided waveform is given is set to 40 μsec to 60 μsec,
The time that the pre-divided waveform is given is set to be substantially the same as the short pause time,
When showing the integrated values obtained by integrating the magnitude of the flowing current as a current amount, the total current amount of the current amount given by the following division waveform and current amount given in the previous division waveform, It is set to be larger than the amount of current obtained when the predetermined voltage is continuously applied during the total time of the time when the pre-divided waveform is given and the time when the post-divided waveform is given.
An electrical stimulator characterized by that. In claim 1,
The pair of electrodes, there is a spike-type having a metallic projection protruding into the patient body surface to the surface of the metal plate, electrical stimulation apparatus according to claim and this. In claim 1,
2. The electrical stimulation device according to claim 1, wherein a time for which the post-divided waveform is given is set to be substantially the same as the predetermined pause time. In any one of Claims 1 thru | or 3 ,
The electrical stimulation apparatus according to claim 1, wherein each of the divided waveforms is a rectangular wave. In any one of Claims 1 thru | or 4 ,
An electrical stimulation device, characterized in that it is a low frequency electrotherapy device in which the predetermined period is a low frequency.

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