WO2014002761A1

WO2014002761A1 - Electric potential treatment device

Info

Publication number: WO2014002761A1
Application number: PCT/JP2013/066174
Authority: WO
Inventors: 小川幸雄
Original assignee: 株式会社白寿生科学研究所
Priority date: 2012-06-26
Filing date: 2013-06-12
Publication date: 2014-01-03
Also published as: TW201410289A; TWI612985B; KR102120383B1; JP2014004235A; CN104394928B; HK1207018A1; CN104394928A; KR20150023057A; JP5204331B1

Abstract

The present invention prevents electric shock to a treatment subject, secures the safety of the treatment subject, and easily obtains a sensation of stimulation and a sensation of treatment by means of an AC source. The electric potential treatment device (1), which performs treatment by means of placing the treatment subject within an electric field, is characterized by having: a primary electrode (2) disposed spaced from the treatment subject; a first contact electrode (3) and a second contact electrode (4) disposed in a state contacting the treatment subject; and a voltage generation unit (5) that, with respect to the electrodes, increases the voltage of the commercial power source voltage and supplies a predetermined AC voltage. The electric potential treatment device (1) is further characterized by a high AC voltage for treatment being imparted to the primary electrode (2) by means of the voltage generation unit (5), a low AC voltage being imparted to the first contact electrode (3) and the second contact electrode (4) by means of the voltage generation unit (5), and a weak current (i) being caused to flow through the treatment subject by means of the potential difference between the contact electrodes.

Description

Potential therapy device

The present invention relates to an electric potential treatment apparatus that performs treatment using an electric field, and more particularly to an electric potential treatment apparatus that can give a sense of treatment to the human body while ensuring the safety of the human body.

The potential treatment device applies a high potential to a human body insulated from the ground, and performs treatment using a biostimulation action by an electric field formed around the human body. In other words, the electric potential treatment apparatus is configured to generate an electric field around the human body due to a potential difference generated by applying an AC voltage to the human body and the counter electrode. As a method of forming such an electric field, the human body is set to a high potential and the counter electrode is grounded. The human body is grounded to set the counter electrode to a high potential. There is a method of forming.

The human body of the subject to be treated is equipped with a foot electrode on a footrest (foot rest) on which a foot can be placed when the subject sits on a chair, and the foot electrode is placed at a high potential. And an electric field is formed between the surrounding wall and the counter electrode (see, for example, Patent Document 1). In addition, in order to prevent the electric shock of the subject, the human body is grounded, for example, the foot electrode is grounded (ground electrode), and the head electrode or the seat electrode facing it is set to a high potential so that the human body And an electrode that forms an electric field (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 5-123405 JP 2002-177402 A

However, in the technique described in Patent Document 1, since the person to be treated is at a high potential, an electric shock is received when a person touches a surrounding object such as another person or a wall, and this electric shock feels uncomfortable. was there. In the technique described in Patent Document 2, the patient is kept at the ground potential and the above-described electric shock is prevented. However, since the potential difference from the surrounding objects is eliminated, the feeling of stimulation and treatment due to the AC high voltage is eliminated. There was a problem that would disappear.

Accordingly, the present invention provides an electric potential treatment device capable of preventing the electric shock of the patient to be treated, eliminating the patient's discomfort, and easily obtaining a feeling of stimulation and treatment by an alternating high voltage. With the goal.

In order to achieve the above object, the invention according to claim 1 is an electric potential treatment apparatus for performing treatment by placing a patient in an electric field, and is a main electrode arranged separately from the patient. And a first contact electrode and a second contact electrode that are arranged in contact with the patient, and a voltage generator that boosts the commercial power supply voltage and supplies a predetermined AC voltage to these electrodes. An AC voltage is applied to the main electrode by the voltage generator, and an AC voltage is applied to the first contact electrode and the second contact electrode by the voltage generator, respectively. The potential treatment apparatus is characterized in that a weak current flows through the patient due to a potential difference caused by the AC voltage applied to the first contact electrode and the second contact electrode, and the phase of the AC voltage is reversed. is there.

According to this invention, a weak current flows through the human body of the patient to be treated by the first contact electrode and the second contact electrode.

The invention according to claim 2 is an electric potential treatment apparatus for performing treatment by placing the subject in an electric field, and the subject is in contact with a main electrode arranged away from the subject. A first contact electrode and a second contact electrode that are arranged in a state in which the main power supply voltage is supplied, and a voltage generator that boosts a commercial power supply voltage to the electrodes and supplies a predetermined AC voltage to the main contact electrode. An AC voltage for treatment is applied by the voltage generator, and an AC voltage is applied to the first contact electrode and the second contact electrode by the voltage generator, respectively, and a potential difference between the two contact electrodes. A weak current flows through the patient, the alternating voltage applied to the first contact electrode and the second contact electrode is in phase, and the alternating voltage applied to the main electrode Mark on the two contact electrodes The AC voltage to be applied has an opposite phase, and the AC voltage applied to the first contact electrode is set so that the positive peak value is larger than the negative peak value, and is applied to the second contact electrode. The AC voltage is set so that the negative peak value is larger than the positive peak value.

According to the first and second aspects of the invention, an alternating voltage is applied to the first contact electrode and the second contact electrode, and the human body of the patient is not set to a high potential. There is almost no electric shock when touching other grounded objects. In addition, since a weak current flows in the human body due to the potential difference between the AC voltages applied to the two contact electrodes, the treatment subject can easily recognize that the treatment is in progress.

According to the first aspect of the present invention, the human body potential is “zero” because the human body of the patient is not set to a high potential and the phase of the AC voltage applied to the two contact electrodes is opposite. Become. In other words, even if the person to be treated touches a wall or other grounded object, there is no electric shock at all.

According to the second aspect of the present invention, the AC voltage applied to the first contact electrode and the second contact electrode has the same phase, and the AC voltage applied to the main electrode and the two contact electrodes Since the applied AC voltage has the opposite phase, it is possible to treat the patient with a higher potential. The AC voltage applied to the first contact electrode is set so that the positive peak value is larger than the negative peak value, and the AC voltage applied to the second contact electrode is set so that the negative peak value is higher than the positive peak value. Since the current is set to be large, a weak current flows while keeping the human body at a low potential, so that the person to be treated can easily recognize that he / she is in a treatment state.

1 is a schematic circuit diagram of an electric potential therapy apparatus according to Embodiment 1 of the present invention. It is the schematic showing the electric potential of the electric potential treatment apparatus of FIG. It is a schematic circuit diagram of the electric potential treatment apparatus which concerns on Embodiment 2 of this invention. It is the schematic showing the electric potential of the electric potential treatment apparatus of FIG. It is a wave form diagram showing the electric potential of the electric potential treatment device of Drawing 3, (a) shows the waveform of the 1st low electric potential, (b) shows the waveform of the 2nd low electric potential, and (c) shows the waveform of the electric potential of the human body. Is shown.

The present invention will be described below based on the illustrated embodiments.
(Embodiment 1)
1 and 2 show Embodiment 1 of the present invention. The potential treatment apparatus 1 applies an alternating high voltage to the main electrode 2 and applies an alternating low voltage to the first contact electrode 3 and the second contact electrode 4 to place the subject in an electric field. As shown in FIG. 1, mainly, the potential treatment device 100, the main electrode 2 disposed in the potential treatment device 100, the first contact electrode 3, the second contact electrode 4, and And a voltage generation unit 5 as a voltage generator for supplying a voltage to the main electrode 2, the first contact electrode 3 and the second contact electrode 4.

In the first embodiment, the AC high voltage applied to the main electrode 2 is 9000 V, for example, and the AC low voltage applied to the first contact electrode 3 and the second contact electrode 4 is 100 V, for example. As will be described later, the main electrode 2 is induced by a high potential V1 (9000 V) and is used for treatment, and the first contact electrode 3 and the second contact electrode 4 have a low potential V2 (100 V), V3. Each is induced to (100V) and used for bodily sensation.

The electric potential treatment device 100 has a chair 101 on which a surface material is formed of an insulator, a head cover 102, and a footrest (electric power base) 103. The chair 101 is mainly composed of a seat, a backrest, and left and right sidewalls covering the lower body side surface portion of the patient, and operations such as turning the power on and off are performed on the upper surface of the sidewall. A remote controller to perform is provided.

The head cover 102 is disposed above the chair 101, and is positioned so as to be spaced above the head of the patient while the patient is sitting on the chair 101. Built in.

The footrest 103 is disposed on the floor surface in front of the chair 101, and is formed in a size and shape that allows both feet to be placed as a footrest while the patient is sitting on the chair 101. 3 and the second contact electrode 4 are incorporated.

In a state where the patient is sitting on such a potential treatment device 100, the upper part of the body is covered with the head cover 102, the left and right sides of the body are covered with the sidewall, and the lower part of the body is covered with the footrest 103.

The main electrode 2 is built in a head cover 102 covered with an insulator (FIG. 1), and connected to the voltage generating unit 5 to apply an alternating high voltage V1 for treatment (FIG. 2).

The first contact electrode 3 is disposed on one side of the footrest 103 and is covered with an insulator, and is in contact with the right foot of the patient to be treated via the insulator. The first contact electrode 3 is connected to the voltage generation unit 5 in order to flow an inflow current (weak current) i to the patient, and an alternating first low voltage V2 is applied.

The second contact electrode 4 is configured in the same manner as the first contact electrode 3, is disposed on the other side of the footrest 103, and is in contact with the left foot of the patient to be treated via an insulator. The second contact electrode 4 is connected to the voltage generation unit 5 in order to flow a weak current i to the subject, and an alternating second low voltage V3 is applied.

The voltage generating unit 5 boosts the commercial power supply voltage to the main electrode 2 and the

contact electrodes

3 and 4 and supplies a predetermined AC voltage. As shown in FIG. 1, the voltage generating unit 5 mainly includes an outlet 51 for connecting to a commercial power source, and switches 51SW1 and 51SW2, and includes a main electrode transformer 52 and a first contact electrode transformer. 53 and a second contact electrode transformer 54.

The switches 51SW1 and 51SW2 are for switching between supply start (ON) and supply stop (OFF) of power supply from the commercial power source to the potential treatment device 1. The switches 51SW1 and 51SW2 can be switched on and off by a power button provided on the remote controller of the potential treatment device 100.

The main electrode transformer 52 is for inducing the main electrode 2 to the high potential V1, and the primary winding 52a is connected to the outlet 51 via one end of the switch 51SW2 and one end of the primary winding 52a via the switch 51SW1. Connecting. The secondary winding 52b of the main electrode transformer 52 has one end connected to the ground G and the other end connected to the main electrode 2 via the main electrode current limiting element 52R. The current limiting element 52R has a function of increasing output impedance in order to prevent electric shock from the main electrode 2. In the main electrode transformer 52, when the voltage generating unit 5 is operated, a high potential (high potential) V1 is induced.

The first contact electrode transformer 53 is for inducing the first contact electrode 3 to the first low potential V2. The primary winding 53a has one end via the switch 51SW2 and the other end the switch 51SW1. Is connected to the outlet 51 via The secondary winding 53b of the first contact electrode transformer 53 has one end connected to the ground G and the other end connected to the first contact electrode 3 via the first contact electrode current limiting element 53R. This current limiting element 53R is connected to increase the safety of the first contact electrode 3. In this embodiment, the current limiting element 53R is set such that the weak current i flowing through the human body of the patient to be treated is, for example, about 0.5 to 1 mA. In such a first contact electrode transformer 53, when the voltage generating unit 5 is activated, a low potential (first low potential) V2 is induced.

The second contact electrode transformer 54 is for inducing the second contact electrode 4 to the second low potential V3, and is configured in the same manner as the first contact electrode transformer 53. One end of the primary winding 54a of the contact electrode transformer 54 is connected to the outlet 51 via the switch 51SW1, and the other end is connected to the outlet 51 via the switch 51SW2. That is, the connection method with the commercial power source of the first contact electrode transformer 53 and the connection method with the commercial power source of the second contact electrode transformer 54 are reversed. Specifically, the primary winding 54b of the second contact electrode transformer 54 has one end connected to the ground G, and the other end connected to the second contact electrode transformer 54 via the second contact electrode current limiting element 54R. Connect to. The current limiting element 54R is connected to increase the safety of the second contact electrode 4 in the same manner as the current limiting element 53R. In such a second contact electrode transformer 54, when the voltage generating unit 5 is activated, a second low potential V3 having a phase opposite to that of the first low potential V2 is induced.

As shown in FIG. 2, the voltage generating unit 5 having such a configuration induces a high potential V <b> 1 for potential treatment in the main electrode 2, and the same voltage is applied to the first contact electrode 3 and the second contact electrode 4. Thus, low potentials V2 and V3 having opposite phases are induced, and a therapeutic electric field is formed by the potential difference between the main electrode 2, the first contact electrode 3, and the second contact electrode 4. . When the patient is sitting on the potential treatment device 100, the main electrode 2 is formed above the head, and the

contact electrodes

3 and 4 are in contact with both feet via the footrest 103. The human body is placed in the electric field.

Next, the usage method and operation of the potential treatment device 1 having such a configuration will be described.

First, as shown in FIG. 1, when the patient is seated on the chair 101, both feet of the patient are in contact with the footrest 103 and the head is separated from the head cover 102.

When the person to be treated operates the remote controller on the upper surface of the sidewall to turn on the power supply of the potential treatment device 1, the voltage generating unit 5 is activated. As a result, an alternating high voltage (9000 V) is applied to the main electrode 2, and alternating low voltages V 2 and V 3 (100 V) are applied to the first contact electrode 3 and the second contact electrode 4, respectively. An electric field is formed around the body, and treatment is performed by this electric field.

At this time, since the first low potential V2 of the first contact electrode 3 and the second low potential V3 of the second contact electrode 4 are in the same voltage and in opposite phase, the human body of the patient to be treated is set to the ground potential. In addition, as shown in FIG. 2, due to the potential difference between the first low potential V2 and the second low potential V3, the human body of the patient is placed between the first contact electrode 3 and the second contact electrode 4, that is, the right foot. A weak current i flows between the left foot and the left foot, and this weak current is experienced.

As described above, according to the potential treatment device 1, the AC low voltages V2 and V3 are applied to the first contact electrode 3 and the second contact electrode 4 by the voltage generation unit 5, and the human body of the patient is treated with a high potential. Therefore, even if the patient touches a wall or other grounded object, there is almost no electric shock. Further, since a weak current i flows in the human body due to the potential difference of the AC low voltage applied to the two

contact electrodes

3 and 4, the patient can easily recognize that he / she is in a treatment state by sensing this. Can do. That is, the subject can obtain a feeling of treatment while maintaining the safety of the potential treatment device 1 at a high level. In addition, since the human body of the patient to be treated does not become a high potential, the electric field formed around the human body of the patient to be treated is substantially the same as that when the foot electrode is grounded. That is, even if the first contact electrode 3 and the second contact electrode 4 are provided, the therapeutic effect is not impaired.

Further, since the

contact electrode transformers

53 and 54 and the

contact electrodes

3 and 4 are connected via the current limiting

elements

53R and 54R, the allowable values for the first contact electrode 3 and the second contact electrode 4 are exceeded. Control can be performed so as to prevent the weak current i from flowing, so that the patient can obtain an appropriate treatment feeling and can reduce the risk of electric shock.
(Embodiment 2)
3 to 5 show a second embodiment of the present invention. In this embodiment, the configuration of the voltage generation unit 6 is different from the voltage generation unit 5 in the first embodiment. For this reason, about the structure equivalent to Embodiment 1, the description is abbreviate | omitted by attaching | subjecting the same code | symbol or a corresponding code | symbol.

In this embodiment, as shown in FIGS. 3 and 4, a high potential V11 for potential treatment is induced in the main electrode 2, and the same voltage is applied to the first contact electrode 3 and the second contact electrode 4. Low potentials V12 and V13 having different maximum values in the same phase are respectively induced. Further, the high potential V11 is set to have an opposite phase to the low potentials V12 and V13.

In the voltage generating unit 6, the AC low voltage applied to the two

contact electrodes

3, 4 has the same phase, and the AC high voltage applied to the main electrode 2 and the two

contact electrodes

3, 4 are applied. The AC low voltage is such that the phase is reversed. The voltage generating unit 6 sets the AC voltage applied to the first contact electrode 3 so that the positive peak value is larger than the negative peak value, and the AC voltage applied to the second contact electrode 4 is The negative peak value is set to be larger than the positive peak value.

As shown in FIG. 3, the primary winding 62a of the main electrode transformer 62 of the voltage generating unit 6 has one end connected to the switch 61SW1 and the other end connected to the switch 61SW2. The secondary winding 62b of the main electrode transformer 62 has one end connected to the ground G and the other end connected to the main electrode 2 via the current limiting element 62R. The current limiting element 62R is connected to the main electrode 2. In this manner, when the voltage generating unit 6 is activated, a high potential (high potential) V11 is induced in the main electrode transformer 62.

The

primary windings

63a and 64a of the contact electrode transformers 63 and 64 have one end connected to the outlet 61 via the switch 61SW1 and the other end connected to the outlet 61 via the switch 61SW2. Each of the secondary windings 63b and 64b of the contact electrode transformers 63 and 64 has one end connected to the ground G and the other end connected to the

contact electrodes

3 and 4 via the first current limiting elements 63R1 and 64R1, respectively. Connected.

The secondary windings 63b and 64b of the contact electrode transformers 63 and 64 are connected in parallel with the rectifying elements 63c and 64c, and one end of the rectifying elements 63c and 64c is in first contact with the current limiting elements 63R1 and 64R1. Between the electrode transformers 63 and 64, the other ends of the rectifying elements 63c and 64c are connected to one ends of the secondary windings 63b and 64b via the second current limiting elements 63R2 and 64R2, respectively.

The rectifying element 63c connected to the first contact electrode transformer 63 is connected in the forward direction, and the rectifying element 64c connected to the second contact electrode transformer 64 is connected in the reverse direction.

As a result, in the first contact electrode transformer 63, the AC voltage across the secondary winding 63b is a ratio between the resistance value of the first current limiting element 63R1 and the resistance value of the second current limiting element 63R2. And the respective peak values are applied to the first contact electrode 3 by the rectifying element 63c in a relationship of | + V12p |> | −V12p | (FIG. 5A).

In the second contact electrode transformer 64, the AC voltage across the secondary winding 64b depends on the ratio between the resistance value of the first current limiting element 64R1 and the resistance value of the second current limiting element 64R2. The divided voltages are applied to the second contact electrode 4 by the rectifying element 64c so that the respective peak values have a relationship of | + V13p | <| −V13p | (FIG. 5B).

As shown in FIG. 4, the voltage generating unit 6 configured in this way is induced with an AC high voltage V11 for potential treatment in the main electrode 2, and the first contact electrode 3 and the second contact electrode 4 have As shown in FIGS. 5A and 5B, AC low voltages V12 and V13 having the same voltage and different in-phase maximum values are induced, respectively, and the AC high voltage applied to the main electrode 2 and each contact electrode 3, Since the AC low voltages V12 and V13 applied to 4 are in opposite phases, the electric field formed by these is stronger than the electric field formed between the main electrode 2 and the ground G (Embodiment 1).

In addition, a potential difference is generated between the first contact electrode 3 and the second contact electrode 4 as described above, and the person to be treated with the left and right feet on the

contact electrodes

3 and 4 has a low potential close to the ground potential. In addition to preventing an electric shock or a burn caused by an electric discharge when touching an external person or object during treatment, a weak current i flows through the human body, and the weak current i is perceived by the human body as a stimulus.

The weak current i is preferably set to a current value (1 mA or less) with no danger. For this purpose, the AC voltage applied to each of the

contact electrodes

3 and 4 is the first current limiting element 63R1 or 64R1. And the ratio of the resistance value between the second current limiting element 63R2 or 64R2 is appropriately set. The setting of the ratio of the resistance values controls the value of current flowing through the human body, and adjusts the strength of current stimulation to the human body.

Further, since the contact electrode transformers 63 and 64 and the

contact electrodes

3 and 4 are connected via the current limiting elements 63R1 and 64R1, a weak current i exceeding an allowable value flows to the

contact electrodes

3 and 4. Thus, it is possible to control the patient so as to obtain an appropriate treatment feeling and reduce the risk of electric shock.

Although the first and second embodiments of the present invention have been described above, the specific configuration is not limited to each of the first and second embodiments, and design changes and the like within a scope not departing from the gist of the present invention are possible. Even if it exists, it is included in this invention.

For example, the AC voltage for treatment induced in the main electrode may be substantially the same as the AC voltage for bodily sensation induced in each contact electrode, 9000V for the main electrode, 9000V for the first contact electrode, and 9000V for the second contact electrode. May be induced.

Moreover, the phase of the alternating voltage for treatment induced in the main electrode and the alternating voltage for bodily sensation induced in each contact electrode is not limited to the combination of the first and second embodiments. For example, the alternating voltage for treatment And two AC voltage for bodily sensation may be in phase. Specifically, 9000V is induced in the main electrode, 100V is induced in the first contact electrode, and 90V is induced in the second contact electrode. In this way, a weak current commensurate with the difference in potential applied to the first contact electrode and the second contact electrode (10 V) flows to the human body, and the patient undergoes electric field therapy while sensing the weak current. Can receive.

Furthermore, the phases of the AC voltages applied to the three electrodes may be shifted by 120 °.

Moreover, in the said

Embodiment

1, 2, although what showed the two

contact electrodes

3 and 4 arrange | positioned on the right and left on the footrest 103 was shown, this invention is not restricted to this, The armrest part which mounts a left and right elbow Each of the contact electrodes may be arranged on the left side, or two contact electrodes may be arranged on the left and right sides of the seat portion of the chair 101. That is, a part of the body of the patient to be treated may be brought into contact with the contact electrodes disposed at two locations so that the weak current i flows.

Furthermore, the current limiting

elements

53R, 54R, 63R1, and 64R1 may be adjusted as appropriate to adjust the magnitude of the weak current i flowing through the human body so that the stimulation and treatment feeling can be adjusted according to the patient. Of course.

DESCRIPTION OF SYMBOLS 1 Potential treatment apparatus 2 Main electrode 3 1st contact electrode 4 2nd contact electrode 5 Voltage generation unit (voltage generation apparatus)
51 Outlet 51SW1 Switch 51SW2 Switch 52 Main Electrode Transformer

52a Primary Winding

52b Secondary Winding 52R Main Electrode Current Limiting Element 53 First Contact Electrode Transformer

53a Primary Winding

53b Secondary Winding 53R First Contact Electrode Current limiting element 54 transformer for second contact electrode 54a primary winding 54b secondary winding 54R current limiting element for second contact electrode V1 high potential V2 first low potential V3 second low potential i weak current 6 voltage generating unit (Voltage generator)
61 Outlet 61SW1 Switch 61SW2 Switch 62 Main Electrode Transformer

62a Primary Winding

62b Secondary Winding 62R Current Limiting Element 63 First Contact Electrode Transformer

63a Primary Winding

63b Secondary Winding 63c Rectifying Element 63R1 First Current Limiting Element 63R2 Second current limiting element 64 Second transformer for contact electrode 64a Primary winding 64b Secondary winding 64c Rectifier element 64R1 First current limiting element 64R2 Second current limiting element 100 Potential therapy device 101 Chair 102 Head cover 103 Footrest ( (Electric stand)
V11 High potential V12 First low potential V13 Second low potential i Weak current

Claims

An electric potential treatment apparatus for performing treatment by placing a subject in an electric field,
A main electrode that is spaced apart from the subject, a first contact electrode and a second contact electrode that are placed in contact with the subject, and boosts the commercial power supply voltage to these electrodes. And a voltage generator for supplying a predetermined AC voltage,
An AC voltage for treatment is applied to the main electrode by the voltage generator,
AC voltage is applied to the first contact electrode and the second contact electrode by the voltage generator, respectively, so that a weak current flows to the patient due to a potential difference between the two contact electrodes,
The AC voltage applied to the first contact electrode and the second contact electrode has its phase reversed.
An electric potential therapy apparatus characterized by that.
An electric potential treatment apparatus for performing treatment by placing a subject in an electric field,
A main electrode that is spaced apart from the subject, a first contact electrode and a second contact electrode that are placed in contact with the subject, and boosts the commercial power supply voltage to these electrodes. And a voltage generator for supplying a predetermined AC voltage,
An AC voltage for treatment is applied to the main electrode by the voltage generator,
AC voltage is applied to the first contact electrode and the second contact electrode by the voltage generator, respectively, so that a weak current flows to the patient due to a potential difference between the two contact electrodes,
The AC voltage applied to the first contact electrode and the second contact electrode has the same phase, and the AC voltage applied to the main electrode and the AC voltage applied to the two contact electrodes are The AC voltage applied to the first contact electrode is set so that the positive peak value is larger than the negative peak value, and the AC voltage applied to the second contact electrode is negative. The peak value is set to be greater than the positive peak value.
An electric potential therapy apparatus characterized by that.