JPS6147102B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low frequency therapy device equipped with a compensation circuit.

Conventionally, many attempts have been made to improve the stability of the oscillator in low-frequency treatment devices in order to maintain the waveform of the low-frequency voltage applied to the conductor in a predetermined state.

However, because the equivalent circuit of the human body, which comes into contact with the therapeutic conductor and acts as a load, is capacitive and varies greatly from person to person, many of these attempts have not yielded the results expected. As usual, the waveform of the current flowing into the human body, which is a load, is often far from that which is considered to have a therapeutic effect.

In addition, the capacitive component of the load obstructs the flow of current, and in order to flow a predetermined therapeutic current, the oscillation output must be increased more than necessary, which cannot be ignored.

The inventor of the present invention considered the low-frequency treatment device independently, and rather than wasting effort to improve its characteristics, the inventor conducted comprehensive research, including the dynamic characteristics when contacting a load, and In addition to solving the various drawbacks of conventional devices, we also strived to develop a cheaper and more stable low-frequency treatment device.

As a result, we focused on the fact that the equivalent circuit of the human body is capacitive, as shown by M surrounded by the broken line in Figure 1, and it is possible to cancel the influence of the same capacitive component at the output end of the oscillation circuit of the low-frequency treatment device. The inventors have completed the present invention by discovering that all of the objects of the present invention can be achieved by providing a compensation circuit consisting of an inductive component.

That is, the present invention provides a low-frequency treatment device consisting of a low-frequency oscillation circuit, a power supply circuit for operating the oscillation circuit, and a therapeutic conductor, in which a compensation circuit having an inductive reactance is provided at the output end of the oscillation circuit. Low-frequency therapy with a compensation circuit is characterized in that the output waveform of the low-frequency voltage applied to the conductor and flowing into the human body compensates for changes due to the capacitive load in contact with the therapeutic conductor. Concerning vessels.

The present invention will be explained in detail below.

FIG. 1 shows an outline of the low frequency treatment device of the present invention and an equivalent circuit of the human body.

The output of the low frequency oscillator O passes through a compensation circuit composed of a resistor _R1 and an inductance _L1 , and is contacted in series with a load M, that is, a human body, via a contact resistor _R2 .

In the equivalent circuit M of the human body, R ₃ represents the electrical resistance of the skin, C ₁ represents the capacitive component of the human body, and R ₄ represents its DC resistance. Further, _R5 is the equivalent resistance of the power supply circuit.

Although there are individual differences, the capacitive component C ₁ of the human body is usually
The electrical resistance R ₃ of the skin + the direct current resistance R ₄ of the human body is about 10 ^-3 to ^{10 -2} microfares, and about several kilohms to several tens of kilohms.

Generally, the load impedance Z for alternating current is expressed as Z=√ ² +(-1) ² . Therefore, in the case of this device, Lω≒1/
If the inductance L is selected to be, for example, several Henrys at a firing frequency of 100 to 1000 hertz so that Cω, the low frequency current will efficiently flow into the human body, which is the load, and the output waveform will be almost equal to the original output waveform. It is.

FIG. 2 shows an example of a portable low frequency treatment device with a compensation circuit according to the present invention.

Here, the output of the low frequency oscillator O becomes a differential waveform due to the output capacitor C ₂ and the resistor R ₆ , and then is converted into a pulse voltage consisting of a negative current component (Fig. 3 E) and a positive current component by the diodes D ₁ and D ₂ , etc. (Fig. 3 C), an alternating voltage having both components (Fig. 3 D), or an appropriately biased pulse voltage (Fig. 3 F, G). That is, if switch S ₁ is connected to terminal b and switch S ₂ is connected to terminal b' in FIG. ₂ , the waveform shown in _FIG .
When switch S 1 is connected to terminal a', the waveform shown in Figure 3G is obtained; when switch S ₁ is connected to terminal B and switch S ₂ is connected to terminal C', the waveform shown in Figure _3G is obtained; Then, if switch S ₂ is connected to terminal b', the waveform shown in Figure 3 (c) is obtained, and if switch S ₁ is connected to terminal c and switch S ₂ is connected to terminal b', the waveform shown in Figure 3 (e) is obtained. . These output voltages are
It is supplied to the therapeutic conductor P via a compensation circuit consisting of a resistor R ₇ and an inductive inductance L ₂ .

For example, even if the oscillation output as shown in Figure 3A is directly applied to the therapeutic conductor P and an attempt is made to supply it to the human body, a sharp spike-like waveform voltage as shown in Figure 3B will flow in due to the capacitive component _C1 of the human body. is common.

However, in the low frequency treatment device with a compensation circuit according to the present invention, the influence of the human body's capacitive component _C1 is canceled out by the inductive inductance _L1 or _L2 , resulting in an original waveform with almost no spikes. A current with a similar waveform is supplied to the human body, making it possible to obtain the expected low-frequency therapeutic effect.

It is also within the scope of the present invention to provide a plurality of inductances having various inductive reactance values as necessary, and to switch them appropriately using a rotary switch or the like.

This low-frequency therapy device is ideal for small portable low-frequency therapy devices that could not be expected to have high stability until now, and is advantageous for iontophoresis of vitamins, promotion of skin metabolism, and treatment of neuralgia and muscle pain. Can be used.

[Brief explanation of the drawing]

The figures show embodiments of the present invention, FIG. 1 is a circuit diagram schematically showing a low frequency treatment device of the present invention, FIG. 2 is a circuit diagram of a portable low frequency treatment device with a compensation circuit of the present invention,
FIG. 3 is a waveform diagram showing various output waveforms. The symbols in the figure are explained as follows. B
is the power supply for the oscillation circuit, C ₁ is the capacitive component of the human body, C ₂
is the output capacitor, D is the diode, E is the treatment device grounding section, L is the inductive inductance, M is the equivalent circuit of the human body, O is the low frequency oscillator, P is the treatment conductor,
R ₃ is the electrical resistance of the skin, R ₄ is the direct current resistance of the human body,
R ₁ , R ₂ , R ₅ , R ₆ , R ₇ are resistors, and S is a switch.

Claims (1)

[Claims] 1. In a low-frequency treatment device consisting of a low-frequency oscillation circuit, a power supply circuit for operating the oscillation circuit, and a therapeutic conductor, a compensation circuit having an inductive reactance is provided at the output end of the oscillation circuit, and the voltage is applied to the therapeutic conductor. A low-frequency treatment device with a compensation circuit, which compensates for changes in the output waveform of a low-frequency voltage due to a capacitive load in contact with a treatment conductor.