JPH11290334A - High voltage power unit for electric surgical apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a miniaturized and inexpensive high voltage power unit for electric surgical apparatus. SOLUTION: This high voltage power unit for electric surgical apparatus is provided with an inductor L1 and switching devices 36 and 37 for electrifying high voltage impulse to the high frequency resonance circuit of a high frequency transformer 34 for outputting a high frequency high voltage to an electric surgical apparatus and a low DC voltage supply circuit is provided for supplying a low DC voltage to the inductor L1 so that this unit can be constituted compact and inexpensive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage power supply for outputting a high-frequency high voltage to an electrosurgical instrument for stopping or incising a living body.

[0002]

2. Description of the Related Art A high-voltage power supply for outputting a high-frequency high voltage to an electrosurgical device for stopping or incising a living body is disclosed in, for example, Japanese Patent Publication No. 6-004076. FIG. 6 is a block diagram showing a main configuration of the high-voltage power supply device described in the publication. FIG.
As shown in FIG.
A step-up transformer 51 which uses 00 volts as a power source and boosts an AC 100 volt voltage to a several hundred volt voltage;
A high-voltage triac 52 for controlling the firing angle of the voltage output from the step-up transformer 51;
2 to rectify the voltage controlled by the DC high voltage (+ H
V, -HV), a capacitor C1 and a switching device 54 for charging and discharging a DC high voltage from the rectifier circuit 53, and a capacitor C2 and a high-frequency transformer upon receiving supply of charging and discharging energy of the capacitor C1. A high frequency voltage is generated by a resonance circuit composed of the primary coil of the high frequency transformer 55, and an output circuit for outputting a high frequency high voltage having an attenuated waveform from the secondary coil of the high frequency transformer 55 is provided. The primary coil and the secondary coil of the high-frequency transformer 55 are coupled by ferrite, and the degree of coupling is increased. The high-frequency transformer 55-2
The high-frequency high voltage having an attenuated waveform output from the secondary coil is connected to, for example, the electrode 9 of the handpiece 2 for plasma ejection and the counter electrode that makes electrical contact with the lying patient via the capacitors C and C for blocking DC components. 12 are applied. Note that a current sensor 56 for detecting the current of the primary coil of the high-frequency transformer 55 is provided, and a voltage signal corresponding to the detected current is fed back to the high-voltage triac 51 to output power from the secondary coil of the high-frequency transformer 55. The power is controlled so as to reach the set power.

[0003]

In the conventional high voltage power supply for an electrosurgical instrument, the high voltage of the alternating current boosted by the boosting transformer 51 is rectified by the rectifier circuit 53 with the firing angle controlled by the high voltage triac 52. DC high voltage (+
HV, -HV), and a high-frequency voltage is obtained by charging and discharging the DC high voltage with the capacitor C1 and the switching device 54, so that the step-up transformer 51, the high-voltage triac 52, the rectifier circuit 53, capacitor C1, and switching device 5
The withstand voltage characteristics such as 4 must be improved. for that reason,
The conventional high-voltage power supply has a problem that it is large and expensive.

Accordingly, an object of the present invention is to provide a small and inexpensive high voltage power supply for an electrosurgical instrument.

[0005]

According to a first aspect of the present invention, there is provided a high-voltage power supply for an electrosurgical instrument, wherein a high-voltage impulse is applied to a high-frequency resonance circuit of a high-frequency transformer for outputting a high-frequency high voltage to the electrosurgical instrument. Means for supplying a low DC voltage to the impulse energizing means.

A high voltage power supply for an electrosurgical instrument according to claim 2 is the high voltage power supply for an electrosurgical instrument according to claim 1,
The impulse energizing means is to generate the high-voltage impulse by turning on and off the DC low voltage supplied to the inductor.

According to a third aspect of the present invention, there is provided a high voltage power supply for an electrosurgical instrument according to the first or second aspect, wherein a degree of coupling between a primary coil and a secondary coil of the high frequency transformer is variable. Is to configure.

According to the high-voltage power supply for an electrosurgical instrument according to the first and second aspects, a high-voltage impulse to be supplied to a high-frequency resonance circuit provided on a primary side of a high-frequency transformer is generated from a low DC voltage. Therefore, it is possible to reduce the withstand voltage of the DC low-voltage supply means, so that the high-voltage power supply device can be made small and inexpensive.

According to the third aspect of the present invention, the electric power transmitted from the primary coil to the secondary coil is varied by varying the degree of coupling between the primary coil and the secondary coil of the high-frequency transformer. Since the magnitude of the energy can be changed, the degree of heat invasion at a site where a living body undergoes a surgical procedure can be adjusted.

[0010]

According to the high voltage power supply for an electrosurgical instrument according to the first and second aspects, there is an effect that the apparatus can be reduced in size and inexpensive.

According to the high voltage power supply device for an electrosurgical instrument according to the third aspect, the degree of thermal invasion of a portion of a living body to undergo a surgical operation can be adjusted.

[0012]

Next, an embodiment of the present invention will be described. FIG. 1 is a schematic perspective view schematically showing the entire configuration of an electrosurgical apparatus using a high-voltage power supply for an electrosurgical instrument according to the present invention. In this embodiment, the plasma spray type handpiece 2 for performing hemostasis treatment will be described as an electrosurgical instrument. The high-voltage power supply device is built in the main body 1 as described later. The high-voltage power supply can supply a high-frequency high voltage to an electrosurgical instrument such as an electric scalpel.

The handpiece 2 includes a ceramic plasma injection unit 5 to which an inert gas such as argon gas is supplied from a gas supply source 3 via a gas pipe 3a, a main body 1, and a gas supply tube 4, And a gripping portion 6 formed of a synthetic resin casing member formed in a pencil shape capable of housing and supporting the ejecting portion 5 and gripping by an operator. Through the gas supply path, an inert gas (such as an argon gas) can be supplied to the plasma injection unit 5 of the handpiece 2 via a gas flow controller 21 and a gas pipe 3a described later provided in the main body 1. . Then, the inert gas sent to the plasma injection unit 5 is injected from the gas injection port 10 to the outside. The handpiece 2 is electrically connected to the main body 1 via a cable 7 and a connector 8, and the cable 7 is connected to an electrode 9 in the handpiece 2.
Connected to. A high-frequency high-voltage from a high-voltage power supply (high-voltage generating unit) 22 (see FIG. 2), which will be described later, contacts the electrode 9 and the return electrode plate 12 (generally the patient lies down and makes electrical contact with the patient). Is applied to

The tip of the electrode 9 is exposed near the gas injection port 10. With this configuration, when the high-frequency high voltage is applied between the electrode 9 and the counter electrode plate 12, arc discharge generated between the distal end portion of the electrode 9 and the patient does not allow the gas to be injected from the gas injection port 10 to the outside (the affected part). The active gas is turned into plasma, and a surgical treatment of the diseased tissue can be performed by the thermal energy transmitted by the plasmated gas.

On the other hand, a part of the grip portion 6 of the handpiece 2 is provided with a switch mechanism having a push button type switch 11 disposed therein. Thus, the doctor operates the switch 11 with a finger during the surgical procedure, thereby controlling gas supply from the main body 1 to the handpiece 2 and on / off control of the power output between the electrode 9 and the counter electrode plate 12. Can be performed.

Next, the configuration of the main body 1 will be described. FIG. 2 is a block diagram schematically showing the internal configuration of the main body 1. As schematically shown in FIG. 2, the main body 1 includes a gas flow regulator 21 for supplying an inert gas to the handpiece 2 at a constant pressure, and a high-voltage power supply (high-voltage power supply) for outputting a high-frequency high voltage. A generator 22) and a controller 23 for controlling the entire electrosurgical apparatus are provided.

The gas flow regulator 2 provided in the main body 1
Reference numeral 1 denotes a valve for supplying a predetermined amount of an inert gas such as an argon gas to the handpiece 2. That is, as shown in FIGS. 1 and 2, this gas flow controller 21 is connected to an external gas supply source 3 through a gas pipe 3a,
It communicates with the gas supply tube 4 via a gas pipe 3a and a joint 4a. This gas flow controller 21
Is electrically connected to the control unit 23, and its operation is controlled based on an operation signal from the control unit 23. For this reason, a predetermined amount of inert gas is supplied to the handpiece 2.
To the plasma ejecting unit 5 of the first embodiment.

The control unit 23 is operated based on an operation signal input from a setting switch on the operation panel 24 on the surface of the main body 1, a gas flow controller or the like, or an operation signal from the switch 11 provided on the handpiece 2. Voltage power supply 22
It controls the power value of the high-frequency high voltage output from the controller and the supply amount of the inert gas. The controller 23 typically includes a CPU (processor), a ROM, a RAM, an input processing circuit, an output processing circuit, a gas flow control circuit, and the like. The CPU controls the entire electrosurgical apparatus according to a predetermined control program stored in the ROM.

Further, as shown in FIG. 2, a sensor 25 for detecting the supply state of the inert gas flowing through the gas pipe 3a to a part of the gas pipe 3a downstream of the gas flow controller 21 is provided by the control unit. 23 and is electrically connected thereto. The structure of the sensor 25 itself is a general one capable of indirectly detecting the supply state of the inert gas in the gas pipe 3a from the pressure change or the gas flow rate difference in the gas pipe 3a. Sent. And
The control unit 23 can control the power output supplied from the high-voltage power supply device 22 to the handpiece 2 based on the received detection signal.

Next, the configuration and operation of the high-voltage power supply device 22 will be described with reference to FIG. FIG. 3 is a circuit block diagram showing the configuration of the high-voltage power supply device 22. Figure 3
As shown in FIG. 1, the high-voltage power supply device 22 receives an AC 100 volt as a power supply and steps down the voltage to a predetermined voltage, and a rectifier circuit 3 that rectifies the stepped-down voltage.
2, a low voltage stabilizing circuit 33 for stabilizing the rectified voltage to a predetermined low DC voltage, an inductor L1 to which the low DC voltage from the low voltage stabilizing circuit 33 is applied to one end, and a DC component cutoff. A high-frequency transformer 34 for outputting a high-frequency high voltage from a secondary coil 34b to the electrode 9 and the counter electrode plate 12 of the handpiece 2 via capacitors C and C, two switching devices 36 and 37, and a switching device 36. Oscillation control circuit 3 for switching control of
5, a diode D1, D2, D3, a capacitor C1 connected to the primary coil 34a of the high-frequency transformer 34 and serving as a reactance component of the high-frequency resonance circuit, and a current sensor for detecting the current of the primary coil 34a of the high-frequency transformer 34 38. The current sensor 38 outputs a voltage signal corresponding to the current of the primary coil 34a of the high-frequency transformer 34 to the oscillation control circuit 35, and varies the switching period of the switching devices 36 and 37, thereby changing the output power of the high-frequency transformer 34. Is used to control to a set value. Further, by inserting an iron core or the like into a bobbin around which the primary coil 34a and the secondary coil 34b of the high-frequency transformer 34 are wound and by adjusting the position of the iron core or the like, the degree of coupling between the coils 34a and 34b is increased. Can be changed. As means for varying the degree of coupling between the coils 34a and 34b, the distance between the coils 34a and 34b may be adjusted in addition to adjusting the position of the iron core or the like. Note that this high-voltage power supply device has an AC 10
Although the 0 volt voltage is used as the power supply, the low voltage stabilization circuit 33 may use a battery as a power supply to stabilize the DC voltage.

Next, the operation of the high voltage power supply will be described. When an AC 100 volt voltage is applied to the step-down transformer 31, the 100 volt voltage is reduced to, for example, 40 volts. This stepped-down voltage is converted into a DC voltage by the rectifier circuit 32, and then stabilized by the low-voltage stabilizing circuit 33 to a DC low voltage, and output to the inductor L1. A switching device 36 is connected to the inductor L1, and is turned on and off by a switching control signal from an oscillation control circuit 35. FIG. 4 is a waveform diagram of the switching control signal output from the oscillation control circuit 35. The switching device 37 connected to the diode D2 is also turned on and off by the switching control signal having the waveform shown in FIG.

When the switching device 36 is switched on by the first switching control signal from the oscillation control circuit 35 and the switching devices 36 and 37 are switched off after electric energy is stored in the inductor L1, the switching device 36 is switched on. Instantaneous inductor L
1, a high voltage impulse is generated. The high-voltage impulse is supplied to the primary coil 34a of the high-frequency transformer 34 via the diode D1 and the capacitor C1, so that electric energy is accumulated in the primary coil 34a. Next, when the switching devices 36 and 37 are switched on, electric energy is again stored in the inductor L1 and the primary coil 34 of the high-frequency transformer 34 is turned on.
The electric energy accumulated in the high frequency transformer a is composed of the inductance of the primary coil a of the high frequency transformer, the capacitor C1, the diode D3 (connected as a resistance component), and the primary coil of the current sensor. The high-frequency current is supplied to the resonance circuit and is subjected to high-frequency resonance, so that a high-frequency current flows through the primary coil 34 a of the high-frequency transformer 34. As a result, a high frequency high voltage having an attenuation waveform as shown in FIG. 5 is output from the secondary coil 34b of the high frequency transformer 34. This attenuation waveform can be arbitrarily selected by changing the duty ratio of the switching control signal and the degree of coupling between the primary coil 34a and the secondary coil 34b of the high frequency transformer 34. The high frequency high voltage having an attenuated waveform output from the secondary coil 34b of the high frequency transformer 34 is applied to the electrode 2 of the handpiece 2 and the counter electrode plate 9 via the DC blocking capacitors C, C. The current sensor 38 outputs a voltage signal corresponding to the current of the primary coil 34 a of the high-frequency transformer 34 to the oscillation control circuit 3.
5 to change the switching cycle of the switching devices 36 and 37,
4 is controlled to a preset value.

Hereinafter, the operation of the electrosurgical apparatus when performing hemostasis processing will be described. First, by turning on a power switch (not shown) provided on an operation panel 24 installed on the surface of the main body 1, electric power is supplied to the main body 1 from a commercial power supply. Next, the doctor holding the handpiece 2 turns on the push-button switch 11 provided on the handpiece 2, so that the operation signal from the control unit 23 is transmitted to the gas flow controller 21 provided on the main body 1. Sent. As a result, the gas flow regulator 21 is opened, and the inert gas is supplied from the gas supply source 3 to the working portion 5 in the handpiece 2 via the gas pipe 3a, the sensor 25, and the gas supply tube 4. You. The inert gas supplied in this manner is then supplied to the gas injection port 1
It is injected from 0 to the outside (affected area).

At this time, the supply state of the inert gas flowing through the gas pipe 3a is detected by the sensor 25 based on the gas flow velocity difference or the pressure change, and the detection signal is transmitted to the control unit 23. . When a detection signal indicating that a predetermined amount of gas is being supplied to the plasma injection unit 5 of the handpiece 2 is transmitted from the sensor 25 to the control unit 23, the operation signal is output from the control unit 23 to a high voltage. It is transmitted to the generator 22. Then, a predetermined high-frequency high voltage is applied between the electrode 9 and the counter electrode plate 12 from the high voltage generator 22.

When a predetermined high-frequency high voltage is applied between the electrode 9 and the counter electrode plate 12, an arc discharge occurs between the tip of the electrode 9 and the affected part of the patient, and the inert gas flowing around the electrode 9 is turned into plasma. You. And the doctor says this handpiece 1
By operating 2 and bringing the tip (gas injection port 10) closer to the affected part, the affected gas can be irradiated to the affected part by the plasma gas ejected from the gas injection port 10. This allows
The blood in the affected area is gently coagulated and stopped. When the heat invasion of the affected part is deep, the position of the iron core inserted into the bobbin of the high-frequency transformer 34 is adjusted, and the primary coil 34a,
The heat invasion can be made shallower by weakening the degree of coupling between 34b.

When the doctor completes the electrosurgical treatment of the affected area according to the above-described operation procedure, the control section 23 stops the output of electric power by turning off the push-button switch 11 on the handpiece 2. At the same time, the gas flow controller 21 stops, and the supply of the inert gas to the handpiece 2 ends. Then, by finally turning off the power switch on the operation panel 24, the supply of power is stopped.

The high-voltage power supply device for an electrosurgical instrument described above can generate a high-voltage impulse for energizing a high-frequency resonance circuit of a high-frequency transformer from a low DC voltage. Characteristics can be reduced. Therefore, the power supply device can be reduced in size, and the circuit configuration is simple, so that the power supply device can be provided at low cost. Although the high-voltage power supply uses an AC 100 volt power supply in the above description, it can be further downsized by using a battery as a power supply.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view schematically showing the entire configuration of an electrosurgical apparatus.

FIG. 2 is a block diagram schematically showing an internal configuration of a main body of the electrosurgical apparatus.

FIG. 3 is a circuit block diagram of the high-voltage power supply device.

FIG. 4 is a waveform diagram of a switching control signal of the oscillation control circuit.

FIG. 5 is an attenuation waveform diagram of an output voltage of a high-frequency transformer.

FIG. 6 is a circuit block diagram of a conventional high-voltage power supply device.

[Explanation of symbols]

 2 Handpiece 9 Electrode 12 Counter electrode 22 High voltage power supply 31 Step-down transformer 32 Rectifier circuit 33 Low voltage stabilization circuit 34 High frequency transformer 35 Oscillation control circuit 36, 37 Switching device L1 Inductor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takao Furudate 28, Kitaimaji Setona, Onishi-shi, Aichi MEX

Claims (3)

[Claims] 1. An impulse energizing means for applying a high-voltage impulse to a high-frequency resonance circuit of a high-frequency transformer for outputting a high-frequency high voltage to an electrosurgical instrument; A high voltage power supply for an electrosurgical instrument comprising a voltage supply means. 2. The high voltage power supply for an electrosurgical instrument according to claim 1, wherein said impulse energizing means generates said high voltage impulse by turning on and off said low DC voltage supplied to an inductor. 3. The high-voltage power supply for an electrosurgical instrument according to claim 1, wherein the degree of coupling between the primary coil and the secondary coil of the high-frequency transformer is variable.