JPH0332661A - Electric surgical operation device - Google Patents

Abstract

PURPOSE:To execute a surgical operation by supplying efficiently a high frequency current in accordance with various parts or states of different load impedance by providing an impedance transducer on an output part of a high frequency generating circuit so that the output impedance can be switched. CONSTITUTION:In the case of only a device body 11, that is, in the case an impedance transducer 13 is not connected, the maximum output is obtained when the load impedance is about 1kOMEGA, but in the case the load impedance exceeds it, the output drops. On the other hand, in the case the impedance transducer 13 is connected, the maximum output is obtained when the load impedance is about 4kOMEGA, and in the case the load impedance becomes larger or smaller than its value, the output drops likewise. At the time of using this device, a surgical operation is executed by adjusting an oscillation waveform to a continuous waveform or an intermittent waveform of a suitable interval by a regulator 28, executing an adjustment so as to obtain a suitable output by a regulator 25, and turning on an output switch 14 in a state that a scalpel tip electrode 51 is placed against a prescribed part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrosurgical device for incising, coagulating, or mixing tissue of a living body using high-frequency current.

[Conventional technology]

An electrosurgical device (1i scalpel) passes a high frequency current (e.g. 0.3 to 5 MH2) output from a high frequency generation circuit to a living body through an electrode part, and damages living tissue by Joule heat generated near the electrode part. It is incised or coagulated.

A conventional electrosurgical device includes a device main body incorporating a high-frequency generating circuit that generates high-frequency power, and an electrode section connected to the device main body by a cord. As the electrode section, a scalpel tip electrode, a return electrode, or a bipolar electrode is used, and there are many types with different sizes and shapes depending on the site where the surgery is performed.

In such conventional electrosurgical instruments, the output impedance of the high frequency generation circuit is fixed at a constant value.

[Problem to be solved by the invention]

However, when performing surgery with an electrosurgical instrument, the load impedance of a living body varies greatly depending on the location or state of the living body.

For example, in the internal organs of a living body, the load impedance is low at several tens to hundreds of ohms (ohms) because of the presence of blood and body fluids, and on the skin surface, the load impedance is more than several ohms because it dries easily and there is little blood and body fluids. It may happen. Furthermore, if there is bleeding on the skin surface, the load impedance decreases by about one order of magnitude.

Additionally, when making an incision using a scalpel tip electrode, coagulation occurs at the same time as the incision, and the blood, fat, cell tissue, etc. of the living body is carbonized and adheres to the scalpel tip electrode, which increases the impedance of the scalpel tip. Sometimes.

As described above, the load impedance differs greatly between the internal an and the skin surface, and even on the same skin surface, the load impedance varies depending on the condition, so it is not easy to perform surgery using an electrosurgical device with a constant output impedance.

For example, when performing surgery on a site with a load impedance higher than the output impedance of the electrosurgical device, the high-frequency power output from the electrosurgical device is not efficiently transmitted to the living tissue, which means that the current flowing to the living tissue decreases. Therefore, incision and coagulation are not performed sufficiently, which often makes surgery difficult. Furthermore, when performing surgery on internal organs using an electrosurgical device for the skin surface with high output impedance, there is a risk of causing burns to organs and slowing healing. In such cases, the current practice is to continue the surgery using a metal scalpel or the like.

One possible solution to this problem is to monitor the output state from the high frequency generation circuit and automatically control the supply of a constant current to the living tissue. However, the control circuit is complicated and costly, and it is difficult to control a wide range from the internal organs of the living body to the skin surface, and it is easy to cause burns if used incorrectly. There is a problem.

In view of the above-mentioned problems, an object of the present invention is to provide an electrosurgical device with a simple structure that can efficiently supply high-frequency current and perform surgery corresponding to various parts or conditions with different load impedances. There is.

[Means to solve the problem]

In order to solve the above-mentioned problem, the invention of claim 1 provides a device main body that includes a built-in high frequency generation circuit that generates high frequency power;
an electrosurgical device for incising, coagulating, or mixing biological tissues using high-frequency current; The output impedance is configured to be switchable.

The invention according to claim 2 is characterized in that an impedance converter is connected between the device main body and the electrode section for matching the output impedance of the high frequency generation circuit to the load impedance.

According to a third aspect of the present invention, the impedance converter according to the first or second aspect is formed of a toroidal coil.

[For production]

The impedance converter is housed in a case independent of the device main body, or is built into the device main body.

The impedance converter performs impedance matching between the output impedance of the high frequency generating circuit and the load impedance by being connected or not connected to the output section of the high frequency generating circuit, or by being switched by an appropriate changeover switch.

〔Example〕

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

FIG. 1 is an electric circuit diagram of an electrosurgical device l according to the present invention, and FIG.
The figure is an external view of the electrosurgical device I.

The electrosurgical device 1 includes a device main body 11, an electrode section 12, and an impedance converter 13 connected between the device main body 11 and the electrode section 12.

The device main body 11 includes an oscillation circuit 211 as shown in FIG.
It is composed of a single impulse amplifier circuit 22, a power amplifier circuit 23, an intermittent oscillation control circuit 24, a power supply circuit 25, etc., and each of these parts is housed in a steel case as shown in FIG.

The oscillation circuit 21 oscillates at a main carrier frequency of about 2 MH2, and the on/off state of the 0 oscillation is controlled by an output switch 14 connected by a connector 31 and disposed outside the main body 11 of the apparatus.

The buffer amplifier circuit 22 variably amplifies the output from the oscillation circuit 21 using a regulator 26 .

The power amplifier circuit 23 power-amplifies the output from the buffer amplifier circuit 22. The power amplification circuit 23 is provided with an output coil 27, and an output terminal 32 on the secondary side of the output coil 27 is provided.
．． 33 is set to have an output impedance of IKΩ.

The intermittent oscillation control circuit 24 controls the oscillation circuit 21 so that the oscillation state is continuous or intermittent.

This oscillation state is variably adjusted by the regulator 28.

'Power is supplied to the Eft power supply circuit 25. In addition, 3
0 is a power switch.

The impedance converter 13 consists of a tapped toroidal coil 41, as shown in FIG. The toroidal coil 41 has an inner diameter of about 30 mm.

A resin-coated stranded wire is evenly wound 160 times around a carbonyl iron dust core (relative permeability 20) with an outer diameter of about 50 mm and a thickness of about 30 mm, and a tap T on the primary side is inserted at the 90th turn.
This is the one that rolled 1.

The toroidal coil 41 is housed in a synthetic resin case 40, and a lead wire 4243 is pulled out from its negative side, and plugs 44 and 45 connectable to the output terminals 32 and 33 of the device main body 11 are attached to the tips of the lead wires 4243. It is connected. Output terminals 46 and 47 that are the same as the output terminals 32 and 33 of the device main body 11 are attached to the case 40, and the secondary side of the toroidal coil 41 is connected to the output terminals 46 and 47.

The electrode section 12 consists of a female tip electrode 51 and a counter electrode plate 52, each of which is connected to an electrode cord 53,54 having a plug 55,56 at its tip.

Next, a method of using the electrosurgical device I configured as described above will be explained.

FIG. 4 is a diagram showing output characteristics when the impedance converter 13 is connected and when it is not connected.

As shown in FIG. 4, when only the main body 11 of the device is connected, that is, when the impedance converter 13 is not connected, the maximum output is obtained when the load impedance is around IKΩ, but if the load impedance is larger than that, the maximum output is obtained. If this happens, the output will decrease. On the other hand, when the impedance converter 13 is connected, the maximum output is obtained when the load impedance is around 4Ω, and when the load impedance becomes larger or smaller than that, the output also decreases.

Therefore, when the load impedance is high, such as when making an incision on the skin surface, the device is used with the impedance converter 13 connected as shown in FIGS. 1 and 2. On the other hand, when the load impedance is low, such as when performing incision or cauterization of the internal organ, the impedance converter 13 is not connected and the plug 55° 56 of the electrode section 12 is connected to the output terminal of the device body 11. 32. Use by connecting directly to 33.

When in use, adjust the oscillation waveform to a continuous waveform (during incision) or an intermittent waveform at appropriate intervals (during incision) using the adjuster 28, adjust the output to an appropriate level using the adjuster 25, and adjust the oscillation waveform to a continuous waveform (during incision) or an intermittent waveform at appropriate intervals (during i), and adjust the output to an appropriate level using the adjuster 25. Surgery is performed by turning on the output switch 14 while applying the device 51 to a predetermined site.

According to the above-described embodiment, by connecting or not connecting the impedance converter 13, it is possible to efficiently supply high-frequency current to various parts or states with different load impedances and perform stable surgery. . Since the impedance converter 13 can be configured to be small and lightweight, its connection and removal are extremely easy.

Since the impedance converter 13 has a simple structure, it can be implemented at low cost. Moreover, since it can be connected to the device main body 11 as an option, it can be connected to the conventional device main body 11 and easily correspond to various load impedances. Furthermore, since the output impedance is set according to the load impedance, there is no risk of burns due to misuse.

Also, the impedance converter 13 is replaced by the toroidal coil 4.
1, it can be made small.
There is little loss due to insertion and connection of the impedance converter 13, and there is little leakage magnetic flux, so there is no risk of causing radio wave interference to the outside.

FIG. 3 is an electric circuit diagram showing essential parts of an electrosurgical device 2 according to another embodiment of the present invention.

In the electrosurgery 82, an impedance converter 13a (loidal coil 41) is built into the main body 11a of the apparatus, and the output impedance is switched by a changeover switch 29.

Therefore, by connecting the electrode section 12 to the output terminals 32a, 33a and switching the changeover switch 29, the output impedance between the output terminals 32a, 33a of the device main body 11a can be matched to the load impedance.

In the embodiments described above, the dimensions, material, number of windings, etc. of the core of the toroidal coil 41 can be variously changed depending on the output of the power amplifier circuit 23, the main carrier frequency, etc. The toroidal coil 41 may be provided with a large number of taps, and the output impedance may be switched in multiple stages.

In that case, a tap may be provided to convert the output impedance to a lower level.

In the above embodiment, the single-turn toroidal coil 41
However, a multi-turn toroidal coil may be used, or the toroidal coil 41 may also be used as the output coil 27. In that case, for example, the toroidal coil 4
1 may be used as a neckband, and a large number of taps may be provided on the secondary side and these may be switched.

In the embodiments described above, the device body 11. The configuration, specifications, etc. of each part of lla, electrode section 12, and impedance converter 13.13a can be changed in various ways other than those described above.

〔Effect of the invention〕

According to the inventions of claims 1 to 3, high frequency current can be efficiently supplied corresponding to various parts or conditions with different load impedances, and surgery can be performed stably.

Further, according to the second aspect of the present invention, it is possible to connect an impedance converter to the main body of the device as an option, and it is possible to easily correspond to various load impedances by connecting it to a conventional main body of the device.

Further, according to the third aspect of the invention, the device can be made small and low in cost, and has low loss and leakage magnetic flux, and does not cause radio wave interference to the outside.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram of an electrosurgical device according to the present invention, FIG. 2 is an external view of the electrosurgical device shown in FIG. 1, and FIG. 3 is a main part of an electrosurgical device according to another embodiment of the present invention. FIG. 4 is a diagram showing an example of output characteristics when an impedance converter is connected and when it is not connected. 1.2... Electrosurgical device, ILlla... Device body,
12... Electrode part, 13.13a... Impedance converter, 23... Power amplifier circuit (high frequency generation circuit),
41...Toroidal coil.

Claims (3)

[Claims] (1) It has a device main body incorporating a high frequency generation circuit that generates high frequency power, and an electrode part connected to the device main body,
An electrosurgical device for incising, coagulating, or mixing biological tissue using high-frequency current, characterized in that an impedance converter is provided at the output section of the high-frequency generating circuit, and the output impedance is configured to be switchable. electrosurgical device. (2) having a device main body incorporating a high frequency generation circuit that generates high frequency power, and an electrode part connected to the device main body,
In an electrosurgical device for incising, coagulating, or mixing living tissue with high-frequency current, impedance conversion is provided between the device main body and the electrode section to match the output impedance of the high-frequency generating circuit to the load impedance. An electrosurgical device characterized in that a device is connected to the electrosurgical device. (3) The electrosurgical instrument according to claim 1 or 2, wherein the impedance converter comprises a toroidal coil.