JPH0445191B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a low frequency treatment device, and particularly to an improvement in the driving method of its guide.

[Description of Prior Art] In a low-frequency treatment device that applies low-frequency pulses to the human body through a guide, the wave height, period, polarity, etc. of the low-frequency pulse applied to the guide are adjusted depending on the treatment area, treatment purpose, etc. It is necessary to adjust the origin. For this reason, in conventional treatment devices, the driving pulse output is applied to the conductor via a transformer, and these specifications can be adjusted by adjusting the pulse width, period, polarity, etc. of this driving pulse. Adjustments are being made (for example,
57-53743).

[Problems to be solved by the invention] The control of pulse width and pulse height by back electromotive force is greatly influenced by the core material, stacking thickness, gap, etc. of the transformer used, and is also affected by the winding inductance, Q, etc. It would have been difficult for the device to operate stably over a long period of time as a treatment device unless it was devised to withstand changes over time.

[Means for Solving the Problems] Accordingly, the present invention provides a generating means for generating a predetermined control pulse determined according to the treatment area and treatment purpose, a driving pulse generating means for generating a pulse for driving the conductor, The above problem is solved by using differentiating means for differentiating the control pulse and drive pulse control means for controlling the supply of drive pulses to the conductor using the differentiated output.

[Function] That is, in the present invention, electric power for conductor driving is generated by the driving pulse generating circuit, and the specifications are adjusted by supplying this to the conductor via the driving pulse control means. .

[Examples] The details of the present invention will be explained below based on illustrated examples. FIG. 1 shows the block configuration. In the figure 1
is a selection key, and is provided with a plurality of key switches for selecting the specifications according to the treatment area and treatment purpose. 2 is a control pulse generation circuit;
It consists of a one-chip microcomputer with a built-in CPU, ROM, RAM, I/O, etc., and trigger pulses TP1 and TP2 and control pulses corresponding to the selection signal SS supplied from the selection key 1 according to the program stored in the ROM. CR
1 and CP2 are generated. 3 is a drive pulse generation circuit, which generates a drive pulse DP in response to the trigger pulses TP1 and TP2. 4 is a differentiating circuit which differentiates the aforementioned control pulses CP1 and CP2 and supplies the differentiated pulses DCP1 and DCP2 to the drive pulse control circuit 5. The drive pulse control circuit 5 controls the energization of the drive pulse DP supplied from the drive pulse generation circuit 3 using the differential pulses DCP1 and DCP2, and supplies the output CDP to the conductor 6.

Details of the drive pulse generation circuit 3 are shown in FIG. 2B. In the figure, Tr1 and Tr2 are NPN transistors, their respective bases are connected to input terminals 3a and 3b, their respective emitters are grounded, and their respective collectors are connected to the starting and ending ends of the primary windings P1 and P2 of the transformer T1. It is connected to the. The terminal end of the primary winding P1 and the starting end of P2 are connected to the positive terminal of the storage battery BT, which is the power source for the entire treatment device, and the starting end of the secondary winding S is connected to the output terminal 3C, is grounded.

Details of the differentiating circuit 4 are shown in FIG. 4B. Note that this circuit configuration is a well-known differential circuit consisting of RC,
Only the circuit symbols and terminal symbols are shown and their explanations are omitted.

Details of the drive pulse control circuit 5 are shown in FIG.
In the figure, Tr3 and Tr4 are NPN transistors,
The collector of Tr3 and the emitter of Tr4 are connected to the output terminal 3 of the drive pulse generation circuit 3 via the input terminal 5a.
C, the emitter of Tr3 and the collector of Tr4 are connected to the output terminal 5b, the base of Tr3 is connected to the output terminal 4c of the differentiating circuit 4 via the input terminal 5c, and the base of Tr4 is connected to the output of the differentiating circuit 4 via the input terminal 5d. They are respectively connected to terminals 4d. The right terminal 6a of the conductor 6 is connected to the output terminal 5b of the drive pulse control circuit 5.
The left terminal 6b is grounded.

Next, the operation of this embodiment will be explained. First, the operator presses the selection key 1 to select an operation mode according to the treatment area and treatment purpose. The control pulse generation circuit 2 responds to this key selection and generates predetermined trigger pulses TP1 and TP2 as shown in FIG. 2 and a predetermined cycle as shown in FIG. 3 according to the program stored in its ROM. and control pulses CP1 and CP whose pulse widths are changed depending on time.
Generates 2. Trigger pulse TP1 is for the right side of the conductor 6, trigger pulse TP2 is for the left side, and they are mutually connected.
The phase is shifted by 180 degrees, and the control pulse CP1 is for the right side of conductor 6 and is the trigger pulse.
At TP1, the control pulse CP2 is for the left side of the conductor 6 and is sent out in synchronization with the trigger pulse TP2.

These trigger pulses TP1 and TP2 are supplied to the bases of transistors Tr1 and Tr2 via input terminals 3a and 3b of the drive pulse generation circuit 3,
This causes these transistors Tr1 and Tr2 to become conductive alternately. As a result, the transformer T of this circuit
An excitation current flows alternately from the storage battery BT to the secondary windings P1 and P2 of 1, and a drive pulse in which positive polarity pulses DPP and negative polarity pulses DPN are alternately arranged as shown in FIG. 2C is applied to the secondary winding S. DP occurs.

On the other hand, control pulses CP1 and CP2 are supplied to input terminals 4a and 4b of the differentiating circuit 4, respectively, and C
It is differentiated by an individual differentiation circuit consisting of 1R1 and C2R2. As a result, the output terminal 4 of this differentiating circuit 4
c and 4d are differential pulses whose wave heights change according to the pulse width of control pulses CP1 and CP2.
DCP1 and DCP2 are output.

As mentioned above, these differential pulses DCP1
and DCP2 are supplied to the input terminals 5c and 5d of the drive pulse control circuit 5, and the drive pulse DP is supplied to the input terminal 5a, respectively. As described above, the positive pulse DPP and the differential pulse DCP1 and the negative pulse DPN and the differential pulse DCP2 are synchronized with each other. Therefore, when the positive polarity pulse DPP is applied to the terminal 5a, the differential pulse DCP1 is applied to the terminal 5c, and the conduction of the transistor Tr3 is controlled by the differential pulse DCP1, and the drive current I1 is proportional to the magnitude of the differential pulse DCP1. It flows from the right terminal 6a of the conductor 6 and moves the conductor 6. In addition, when the negative polarity pulse DPN is applied to the terminal 5a, the terminal 5
The differential pulse DCP2 is added to d, and from now on, the transistor Tr4 becomes conductive, and the drive current I2 proportional to the differential pulse DCP2 flows from the left terminal 6b of the conductor 6, passes through the transistor Tr4, and flows to the terminal 5a. Move 6 to the opposite side from before.

The magnitudes, cycles, and temporal changes of these drive currents I1 and I2 are determined by the amplitudes, cycles, etc. of trigger pulses TP1, TP2, and the amplitudes, pulse widths, cycles, etc. of control pulses CP1, CP2, as described above. These are controlled according to a program written in the ROM, similar to the one described in Japanese Patent Publication No. 57-53743 mentioned above.

[Effects] As explained above, according to the present invention, an output transformer like the conventional one is unnecessary, and costs can be reduced. Furthermore, the amplitude, period, etc. of the low frequency pulse applied to the conductor can be adjusted using any of the control pulse drive pulses.

[Brief explanation of drawings]

The figures show an embodiment of the low frequency treatment device of the present invention, in which Fig. 1 is a block diagram, Fig. 2A is a trigger pulse waveform diagram, Fig. 2B is a drive pulse generation circuit circuit diagram, and Fig. 2C is a drive pulse generation circuit diagram. Pulse waveform diagram, Figure 3A is a control pulse waveform diagram, Figure 3B is a differential circuit circuit diagram,
FIG. 3C is a differential pulse waveform diagram, and FIG. 4 is a circuit diagram of a drive pulse control circuit and a connection diagram with a conductor. 2... Control pulse generating means, 3... Drive pulse generating means, 4... Differentiating means, 5... Drive pulse controlling means.

Claims (1)

[Claims] 1: a control pulse generating means for generating a predetermined control pulse; a driving pulse generating means for generating a driving pulse for driving the conductor; a differentiating means for differentiating the control pulse; A low frequency treatment device comprising a drive pulse control means for controlling supply of the drive pulse to the conductor.