JPS6155384B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a high frequency current ablation device for use in both the endoscopic and general surgical fields.

When using a high-frequency current ablation device in the field of general surgery, the active electrode of the treatment device is applied to the patient's area to be ablated and the return electrode is applied to the patient's back, and a high-frequency current is applied from the power circuit to perform the ablation process. do. On the other hand, when used endoscopically, there is a possibility that high-frequency current may leak into the endoscope body, which is dangerous because unnecessary high-frequency current flows to the operator and the patient. To prevent this risk, high-frequency current ablation devices have conventionally incorporated a feedback circuit to return leakage current to the patient electrode side of the high-frequency current ablation device when performing transendoscopic high-frequency current ablation. There is.

By the way, when using a high-frequency current ablation device including a power supply circuit with an output of about 300 W used in the field of general surgery endoscopically, a maximum output of 100 W is sufficient. When using a high-frequency current ablation device endoscopically, it is necessary to have an appropriate output level and to make delicate adjustments.

However, in conventional high-frequency current ablation devices, because the output adjustment means is used on the low output side, it is not possible to obtain the relatively low output that is originally required when using it endoscopically. It was inconvenient and dangerous because it could not be adjusted.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a means for detecting transendoscopic use, and a maximum output limiting circuit driven by receiving an output signal from the detecting means. An object of the present invention is to provide a high-frequency current ablation device having improved safety and operability when used endoscopically.

Embodiments of the present invention will be described below with reference to the drawings.

Referring to FIG. 1, a high frequency current ablation device according to the present invention is shown, and a treatment instrument 2 passes through an endoscope 1. An active current A is supplied to the treatment tool 2 from a high frequency power supply circuit 3 via an active current cord 4, and is supplied via the treatment tool 2 to an active electrode 5 attached to the tip of the treatment tool 2. The active electrode 5 surrounds the area to be ablated 6 of the patient, and a return electrode 7 is arranged on the back of the patient, only schematically shown in the figure. The active current returns from the active electrode 7 via the cord 8 to the power supply circuit 3 as a current B. When used in the field of general surgery, current flows through the path described above to perform radiofrequency ablation.
The power supply circuit 3 includes a high frequency power supply 9, a maximum output limiting resistor 10 that limits the current from the power supply 9, an output transformer 11 that transforms the power supply voltage, and each terminal of the secondary winding of the output transformer 11 and the current. code 4,8
an output transistor 23 connected between the primary winding of the output transformer 11 and a reference potential point, and an oscillator 25 for driving the output transistor 23;
The variable resistor 24 is connected between the oscillator 25 and the base of the output transistor 23 and adjusts the output from the oscillator 25. Furthermore, the power supply circuit 3 includes an insulating rod 18 that moves in the Z direction in the figure when a plug 15 connected to a feedback cord 14 constituting a feedback circuit for leakage current C is inserted into a jack 16, and an insulating rod 18 that moves in the Z direction in the figure. Therefore, when the button 20 is pressed, the switch 1 is controlled to open and close to connect or short-circuit the maximum output limiting resistor 10.
9 and a capacitor 17 which is connected to the secondary winding of the output transformer when the plug 15 is inserted into the jack 16. Although not shown, the button 20 of the switch 19 is connected to the plug 15.
When the switch 19 is not inserted into the jack 16, the switch 19 is biased by a biasing means such as a spring.
The switch 19 is pressed outward from the main body, and in this state, the switch 19 is closed (the contact side is turned on in the detailed power supply circuit shown in FIG. 2), and when the plug 15 is inserted into the jack 16, the switch 19 is closed. It is assumed that the switch 19 is configured so that it is returned to its position and the switch 19 is opened (the contact side is closed in FIG. 2).

Next, to explain the case where the high-frequency current ablation device is used endoscopically, first, the plug 15 to which the current cord 14 constituting the feedback circuit of the leakage current C is connected is inserted into the jack 16, and the The current is returned to the high frequency power supply circuit 3 to prevent leakage to the human body. The leakage current feedback cord 14 has one end connected to the plug 15 and the other end connected to the endoscope body. Now plug 1
5 is inserted into the jack 16, the tip of the plug 15 comes into contact with the end of the insulating rod 18 located on the opposite side of the plug 15 across the jack 16, causing the rod 18 to move in the Z direction. . Rod 1
When the switch 8 moves in the Z direction, the button 20 of the switch 19 is pushed inward, and the switch 19 is opened. That is, in the detailed power supply circuit shown in FIG. 2, the switch 19 is turned on to the contact side. Therefore, power supply 9 and output transformer 1
The maximum output limiting resistor 10 connected between the output transistor 1 and the series circuit of the output transistor 23 changes from the short-circuited state to the electrically connected state. In other words, the resistor 10 is incorporated into the power supply circuit. When resistor 10 is electrically connected, ie, incorporated into a power supply circuit, resistor 10 acts to limit the maximum output from power supply 9, keeping the maximum output level low.

In this way, when using the high frequency current ablation device endoscopically, the plug 15 to which the leakage current feedback cord 14, which constitutes a feedback circuit for feeding back the leakage current C, is connected is inserted into the jack 16. However, in this case, the insulating rod 18 that moves due to this insertion of the plug 15 and the insulating rod 18
The maximum output limiting resistor 10 is connected to the power supply circuit by the function of the switch 19, which is controlled to open and close by the switch 19, and short-circuits the output limiting resistor 10 or connects it to the power supply circuit, thereby reducing the maximum output from the power supply 9. It can be suppressed. With this configuration, safety and operability when using the high-frequency current ablation device endoscopically are greatly improved.

As described above, according to the present invention, it can be used in the field of general surgery, and when used transendoscopically, the leakage current feedback constitutes a feedback circuit that returns leakage current from the endoscope. The plug to which the cord is connected is inserted into the jack of the power circuit,
This insertion is detected by a switch, and this detection signal is used to control the maximum output from the power supply, making it suitable for use in the field of general surgery and transendoscopy. An easy-to-operate and highly safe high-frequency current ablation device that can selectively control the output size from the power supply circuit and adjust it to the required maximum output size according to the case of use. is provided.

In the above explanation, the maximum output limiting resistor 10 is selectively inserted between the power supply 9 and the output transformer 11 in order to control the maximum output of the power supply circuit. It is also possible to use means for controlling the output of the oscillator 25 that drives the output transistor 23 constituting the high frequency power amplifier. Furthermore, for endoscopic use, that is, means for detecting that the plug to which the leakage current feedback cord is connected is inserted into the jack of the power supply circuit is not necessarily mechanical, as shown in Figures 1 and 2. For example, as shown in FIGS. 3, 4, and 5, when the plug 15 to which the leakage current feedback cord 14 is connected is inserted into the jack 16, the leakage current is emitted at the tip of the plug 15. A light emitting element 26 arranged at a position where light comes into contact with it, and a plug 15 from this light emitting element 26
A light receiving element 27 receives the light beam reflected from the tip of the
You may use a photoelectric detection means consisting of (fourth
(see figure). Alternatively, as shown in FIG. 5, the light emitting element 26 and the light receiving element 27 are placed at a position where the optical path is blocked when the plug 15 is inserted into the jack 16.
It is also possible to use a photoelectric detection means arranged with a. Furthermore, as shown in FIG. 6, a circuit consisting of a current detection transformer 28, an amplifier 29 that amplifies the output from the transformer 28, and a feedback resistor that feeds back the output from the amplifier 29 to the input side is provided. It may also be used as a means for detecting leakage current from an endoscope. Further, it is also possible to use means for separately forcibly flowing a current in synchronization with insertion of the plug and detecting this current.
In addition, FIG. 3 shows the jack 16 and this jack 1.
6 shows the plug 15 in a state before being inserted into the plug 6.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the high frequency current cautery device according to the present invention, FIG. 2 is a diagram showing details of the power supply circuit of the high frequency current cautery device of FIG. 1, and FIG. 3 is a diagram showing the plug and jack. FIGS. 4 and 5 each show a photoelectric detection means, and FIG. 6 shows an electric circuit detection means. DESCRIPTION OF SYMBOLS 1...Endoscope, 2...Treatment instrument, 3...High frequency power supply circuit, 9...High frequency power supply, 10...Output limiting resistor, 1
1...Output transformer, 14...Leakage current feedback cord,
15...Plug, 16...Jack, 18...Insulating rod, 19...Switch, 23...Output transistor,
24...variable resistor, 25...oscillator.

Claims (1)

[Scope of Claims] 1. An endoscope including a high-frequency power supply circuit, a treatment member having an active electrode at its tip and through which a high-frequency current from the high-frequency power supply circuit is applied to the active electrode, and the high-frequency power supply circuit; a feedback circuit selectively connected between the endoscope and feeding back leakage current from the endoscope to the high frequency power supply circuit; and a feedback circuit between the high frequency power supply circuit and the endoscope. A high-frequency current ablation device comprising: a detection means for detecting that the high-frequency power supply circuit is connected; and a control circuit for limiting the maximum output of the high-frequency power supply circuit based on an output signal from the detection means. 2. The ablation device according to claim 1, wherein the detection means is a mechanical switch that operates in conjunction with the connection and release of the feedback circuit. 3. The ablation device according to claim 1, wherein the detection means is an optical detection means comprising a light emitting means and a light receiving means that receives light from the light emitting means and outputs an electric signal. 4. The ablation device according to claim 1, wherein the detection means is a leakage current detection means for detecting a leakage current flowing through the feedback circuit. 5. Claim 1, further comprising a current circuit that causes current to flow in synchronization with the connection of the feedback circuit, and wherein the detection means comprises current detection means that detects the current flowing from the current circuit. Cautery device as described in Section. 6. The ablation device according to claim 1, wherein the control circuit is a control means for controlling a high frequency output current from the high frequency power supply circuit. 7. The ablation device according to claim 1, wherein the high-frequency power supply circuit includes a high-frequency power amplification circuit, and the control circuit is a control means for controlling a drive signal for the power amplification circuit.