JPH08100U - Pulse electromagnetic hyperthermia device - Google Patents

Abstract

(57) [Summary] [Purpose] Operates with a portable battery or commercial AC power supply,
High pulse voltage to generate pulsed electromagnetic field,
Another object of the present invention is to provide a pulse electromagnetic hyperthermia treatment device which is lightweight and portable. A variable voltage circuit, an inverter circuit including a step-up transformer and a conversion control circuit, and a rectifier circuit are provided, and a DC current input from a battery circuit or a step-down rectifier circuit is supplied by the inverter circuit to a power supply voltage of about 10%. Variable range voltage up to double and 40 KHz to 10
A linear converter that converts an AC current of 0 KHz and further converts the converted AC current into a DC current by a rectifier circuit, a high-voltage charging / discharging unit and a high-voltage switch connected to the linear converter, and a trigger for driving the high-voltage switch A high-voltage charging / discharging unit is charged with the DC current output from the linear converter, and a pulsed current is supplied to the coil by a high-voltage switch driven by a trigger generation circuit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pulse electromagnetic hyperthermia treatment device for treating an affected part of a human body by causing a fluctuating magnetic field and heat generated from a coil to act on the affected part.

[0002]

[Prior art]

 A conventional pulse electromagnetic therapy device uses a commercial AC power supply of 100V as a power source, such as the electromagnetic therapy device disclosed in Japanese Patent Publication No. 62-1736, and a power transformer connected to the commercial power supply of 100V. , A half-wave voltage doubler rectifier circuit connected to the secondary side of the transformer, a charging / discharging capacitor that is directly connected in parallel to the output side of the half-wave voltage doubler rectifier circuit to charge this voltage doubler, and this capacitor It is composed of a coil that is connected in parallel to both ends of the coil via a switching element to generate a fluctuating magnetic field, and a relaxation oscillation circuit that triggers the switching element connected in series to the coil. With the above configuration, the electric charge stored in the capacitor is intermittently discharged through the coil, and a pulsed electromagnetic field is generated near the coil.

[0003]

[Problems to be solved by the device]

 Since the above-mentioned conventional pulse electromagnetic therapy device uses only a commercial AC power source as a power source and uses a power source voltage transformer, it requires a large-capacity, large-weight power source transformer to obtain a high voltage, and is large and heavy. It was very inconvenient to use as a portable. Furthermore, since a voltage doubler rectifier circuit is used, the voltage of the pulsed current flowing in the coil is as low as twice the secondary voltage of the power source, so only the pulsed electromagnetic field is generated and the pulsed electromagnetic thermotherapy device is used. The therapeutic effect was low. An object of the present invention is to provide a pulse electromagnetic hyperthermia treatment device which operates on a portable battery and a commercial AC power supply, has a high voltage of pulsed current, and therefore generates a lot of heat, and is lightweight and portable. is there.

[0004]

Means for Solving the Problems The above object is achieved by a pulse electromagnetic hyperthermia treatment device according to the following invention. The pulse electromagnetic hyperthermia device according to the present proposal includes an inverter circuit including a voltage variable circuit, a step-up transformer and a conversion control circuit, and a rectifier circuit. The DC current input from either of them is converted into an AC current of 40 KHz to 100 KHz in a variable range up to about 10 times the power supply voltage by an inverter circuit, and the converted AC current is converted to a DC current by a rectifier circuit. Equipped with a linear converter for converting to a high voltage, a high-voltage charging / discharging unit and a high-voltage switch connected to the linear converter, and a trigger generation circuit that drives the high-voltage switch. The pulsed current is supplied to the coil by the high-voltage switch driven by the trigger generation circuit. And a pulse electromagnetic temperature heat treatment device for causing thereby generating a variable magnetic field and heat.

The circuit used in the present invention is a known circuit, and all parts constituting the circuit may be commercially available products. For example, a commercially available variable resistor can be used as the variable resistor used in the voltage variable circuit. An embodiment of the present invention will be described below with reference to the drawings.

[0006]

【Example】

 FIG. 1 is a block diagram showing an electric circuit of an electromagnetic thermotherapy device according to the present invention. A 100V AC power supply or a battery is used as a power supply for the circuit, and a switch 2 switches between the AC power supply and the battery. Since a battery having a voltage of 12 V or 24 V is generally used, the step-down rectifier circuit 1 converts 100 V AC into a DC voltage close to the battery voltage. As shown in FIG. 2, the battery is connected to the battery connecting terminal 16 and the 100 V AC power source is connected to the AC power source connecting terminal 15. The DC voltage supplied from the battery or the step-down rectifier circuit 1 is converted by the linear converter 3 into a DC voltage having a variable range of 0V to 750V. The linear converter 3 is composed of a voltage variable circuit 4, an inverter circuit including a step-up transformer 5 and a conversion control circuit 6, a rectifying circuit 7, a filter 8 and the like. The DC voltage input via the rectifier circuit 1 or the DC voltage from the battery can be varied in the range of 0 to 32 V and input to the step-up transformer 5.

The DC voltage input to the step-up transformer 5 is converted into an AC voltage of 40 KHz to 100 KHz by the function of the conversion control circuit 6, and this AC voltage is converted into a DC voltage by the rectifier circuit 7 and the filter 8. Converted to voltage. The value of the DC voltage can be adjusted in the range of 0V to 750V by changing the input voltage value to the step-up transformer 5 by the voltage variable circuit 4 and the inverter frequency of the conversion control circuit 6 described above. As the power supply for the conversion control circuit 6, DC5V is supplied from the control power supply circuit 9. Further, the DC voltage output through the filter 8 is charged in the high voltage charging / discharging unit 10, and the charged voltage is output to the output terminal 13 by the high voltage switch 12 driven by the trigger generating circuit 11. . The trigger signal of the trigger generating circuit 11 is variable in the range of 0 Hz to 30 Hz. Further, a coil 14 is connected to the output terminal 13, and when the high voltage switch 12 is driven by a trigger signal, the charge charged in the high voltage charging / discharging section 10 becomes a pulsed current and is output. It is supplied to the coil 14 via the terminal 13.

An electromagnetic field is generated in the coil 14 by this current, and the affected area can be treated by causing the varying electromagnetic field to act on the affected area of the human body. As the coil, a coil having a diameter of about 20 cm and a number of turns of several tens of turns is usually used. FIG. 2 shows a circuit example in which the block diagram shown in FIG. 1 is further embodied. The step-down rectifier circuit 1 is composed of a step-down transformer 1a, a rectifier 1b, etc., and the step-down transformer 1a connected to the commercial AC power supply 100V has a transformation ratio of the primary side input voltage 1 to the secondary side. An AC voltage of about / 4 is output. The rectifier circuit connected to the secondary side of the step-down transformer 1a is composed of a rectifier 1b and a capacitor group 1c, and the AC voltage appearing on the secondary side of the transformer 1a is approximately 30V or more. Is converted to DC voltage.

The DC voltage obtained by the rectifier circuit is input to the voltage variable circuit 4 via the switch 2. The switch 2 is used for switching between the battery and the AC power source as described above. Voltage variable circuit 4 is composed of a variable resistor R ₄ and the like to adjust the output voltage of the constant power supply circuit 4a and the constant power supply circuit 4a by IC or the like, 0V to the current voltage of the input is three-dozen V It can be changed and output in the range of 32V. When a 12V or 24V battery is used as a power source, the maximum output voltage is lower than this.

Further, the output voltage of the voltage variable circuit 4 is input to the center tap of the primary side of the step-up transformer 5 wound with a winding ratio of 1:10. A conversion control circuit 6 composed of a pulse oscillation circuit 6a, a flip-flop 6b, a MOS type FET 6c and the like is connected to both primary side terminals of the step-up transformer 5. Oscillation frequency of the pulse oscillation circuit 6 a can be change in the range of 40KHz~100KHz by the variable resistor R _6, the output pulse of the pulse oscillator circuit 6a is inputted to the flip-flop 6 b. Therefore, H and L are alternately output to the output side of the flip-flop 6b, and the connected MOS type FET 6c on the output side of the flip-flop 6b is alternately turned on / off. Therefore, on the secondary side of the step-up transformer 5, an AC voltage having a frequency within the range of 40 KHz to 100 KHz adjusted by the resistor R ₆ of the pulse oscillation circuit 6a appears.

The control power supply DC5V supplied to the flip-flop 6b and the trigger oscillation circuit 11 for the thyristor Rh described later uses the output voltage of the step-down rectifier circuit 1 or the battery voltage as a resistor R.₉, Zener diode Dz, smoothing capacitor C ₉ It is generated by the control power supply circuit 9 composed of the above. A series capacitor C is provided on the secondary side of the step-up transformer 5.₇Is connected to a rectifier circuit 7 having an AC output voltage on the secondary side of the transformer 5 and the capacitor C_TenIt is supplied as a DC voltage to the high voltage charging / discharging unit 10 composed of the above. As for the value of this DC voltage, the secondary voltage generated in proportion to the frequency becomes higher as shown by the following formula of the induced electromotive force of the transformer. E≈4.44 fNΦm where f: frequency, N: secondary winding number, Φm: maximum magnetic flux, the input voltage value (determining the maximum magnetic flux) to the step-up transformer 5 by the voltage variable circuit 4 and the inverter of the conversion control circuit 6 It can be adjusted in the range from 0V to 750V by changing the frequency f.

A positive terminal of the high-voltage charging / discharging unit 10 is connected to one end of the output terminal 13, and a high-voltage switch 12 including a thyristor Rh is connected between the other end of the output terminal 13 and the ground. There is. Further, the coil 14 as described above is connected to the output terminal 13 to the outside. Trigger generating circuit 11 to trigger the thyristor Rh includes a diode D _11, D _11, which is anti-parallel through a variable resistor R ₁₁ and the like to the input and output terminals of the NAND circuit 11a and the NAND circuit 11a, and input terminal It is composed of an oscillating circuit with a capacitor C ₁₁ inserted between the grounds. In this oscillating circuit, when the switch 11c is turned on, the output terminal of the NAND circuit 11a pulse is generated which is determined by the capacitance of the resistance value and the capacitor C ₁₁ of the variable resistor R _11. In this embodiment, the pulse in the range of 0.3 to 30 Hz is generated by adjusting R ₁₁ .

When the pulse is applied to the gate of the thyristor Rh via the photocoupler 11b, the thyristor Rh is turned on and the capacitor C of the high voltage charging / discharging unit 10 is turned on.₁₁The electric charge stored in the coil 14 is discharged through the coil 14 connected to the output terminal 13, and a pulsed electromagnetic field is generated in the coil 14. The trigger pulse generated by the trigger generation circuit 11 is applied to the thyristor Rh via the photocoupler 11b because the thyristor Rh side and the trigger generation circuit 11 side are electrically and magnetically connected. This is to prevent noise from entering the side of the trigger generation circuit 11 by being insulated. Also, a resistor R inserted between the gate and cathode of the thyristor Rh. ₁₂ And capacitor C₁₂Is to prevent the malfunction of the thyristor Rh by bypassing the noise voltage.

[0014]

[Effect of device]

 As described above, since the present invention uses the linear converter, an arbitrary output voltage can be applied to the coil corresponding to the affected area. In addition, since a high voltage can be applied to the coil with a voltage in a variable range up to about 10 times the power supply voltage by an inverter circuit, a heating effect due to heat generation can be expected. Further, since the iron loss of the transformer is inversely proportional to the frequency, since the input DC voltage is invertered to a high frequency of 40 KHz to 100 KHz in this embodiment, the capacity of the step-up transformer for conversion is small and the treatment is complete. The entire vessel can be made smaller and lighter.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of an electric circuit of an electromagnetic thermotherapy device according to the present invention.

FIG. 2 is a circuit diagram embodying the block diagram shown in FIG.

[Explanation of symbols]

 1 Step-down rectifier circuit 2 Changeover switch 3 Linear converter 4 Voltage variable circuit 5 Step-up transformer 6 Conversion control circuit 7 Rectifier circuit 8 Filter 9 Control power circuit 10 High voltage charge / discharge section 11 Trigger generation circuit 12 High voltage switch 13 Output terminal 14 Coil 15 Battery connection terminal 16 AC power supply connection terminal

Claims (1)

[Scope of utility model registration request] 1. A direct current input from either a battery circuit or a step-down rectifier circuit for an AC power supply, comprising an inverter circuit including a voltage variable circuit, a step-up transformer and a conversion control circuit, and a rectifier circuit. Is connected to a linear converter and a linear converter that converts an AC current of 40 KHz to 100 KHz in a variable range up to about 10 times the power supply voltage by an inverter circuit, and further converts the converted AC current into a DC current by a rectifier circuit. High-voltage charge / discharge section and high-voltage switch, and a trigger generation circuit for driving the high-voltage switch, and the high-voltage switch driven by the trigger generation circuit is charged with the DC current output from the linear converter into the high-voltage charge / discharge section. A pulsed current is applied to the coil by the Pulsed electromagnetic thermotherapy device, characterized in that to generate.