JP2510475B2 - Microwave surgical device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave operation apparatus for performing operations such as hemostatic coagulation and excision by irradiating a surgical electrode with microwave energy.

[0002]

2. Description of the Related Art Generally, a microwave surgical device of this type is
Microwave dielectric heat energy is applied to a lesion of a living tissue, for example, a tumor tissue such as liver cancer, through a needle-shaped surgical electrode,
Hemostatic coagulation or excision of diseased tissue due to dielectric heat generated,
Cut off.

Conventionally, in order to prevent the surgical electrode from adhering to the coagulated tissue due to drying, hemostatic coagulation is performed by irradiation of microwave energy, and the peripheral region of the tumor tissue or the like is sequentially coagulated, followed by direct current tissue dissociation. Switching to the supply of electric current, supplying this electric current to facilitate the extraction of the surgical electrode, preventing the occurrence of rebleeding due to the extraction of the needle, and the liver being fragile and rich in blood content,
The operation of parenchymal organs such as spleen, gall, pancreas, kidney, brain, stomach, intestine, and uterus can be performed bloodlessly and extremely easily.

[0004]

In the case of the aforementioned conventional microwave surgical apparatus, the microwave output and the tissue dissociation current output are switched and supplied to the surgical electrode, and the hemostatic coagulation and the like are completed by continuous irradiation of microwave energy. After that, the tissue dissociation is performed by energizing the tissue dissociation current, so that there is a problem that operations such as hemostatic coagulation cannot be performed on a large tumor tissue or the like.

That is, in the case of performing hemostatic coagulation or the like by continuous irradiation of microwave energy, when the tissue coagulates to a certain extent, the irradiation amount or irradiation time of microwave energy is increased and the microwave is applied more than that. Since the water content of the tissue disappears and the spark discharge is generated between the tissue and the electrode to carbonize the coagulated tissue, the coagulated mass does not grow and it is also dangerous. Limited to relatively small ones.

[0006] Further, since a tissue dissociation current is applied after the whole tissue is hemostatically coagulated, the surgical electrode easily adheres to the tissue, and this also limits the size of the operable tumor tissue.

Therefore, conventionally, when a tumor formed in an internal organ of the human body, for example, a liver cancer has a diameter of 1.5 cm or more, the tumor tissue must be hemostatically coagulated by open surgery to be treated. , At this time, the diameter of the tumor is 2 cm, 3
As the size increases to cm, ..., at least two hemostatic coagulations are required at the same site. Therefore, it is desired to perform hemostatic coagulation of tumor tissue percutaneously with a puncture electrode without laparotomy.

It is an object of the present invention to enable hemostatic coagulation of a large tumor tissue by irradiating the surgical electrode with microwave energy, thereby enabling non-laparoscopic hemostatic coagulation.

[0009]

In order to achieve the above-mentioned object, in a microwave operating apparatus of the present invention, a microwave generating source for generating a microwave output for surgery and a DC dissociation current output are generated. And a power supply control means for intermittently supplying a microwave output to the surgical electrode and continuously supplying a dissociation current output to the surgical power supply.

[0010]

In the microwave operation apparatus of the present invention configured as described above, the microwave output of the microwave generation source is intermittently (intermittently) supplied to the operation electrode by the control of the power feeding control means.
And the dissociation current output of the DC power supply is continuously supplied to the surgical electrode.

Microwave energy is intermittently irradiated to the tumor tissue or the like into which the surgical electrode is inserted, and the hemolysis and coagulation are performed by suppressing the carbonization while keeping the water content in the tissue above a certain temperature. During that time, a dissociation current is continuously applied, and the adhesion between the electrode and the tissue is constantly prevented. Therefore, it becomes possible to perform an operation on a large tumor tissue or the like, which has been impossible in the past.

[0012]

EXAMPLE One example will be described with reference to FIGS. FIG. 1 shows the overall configuration. When the start switch 1 such as a foot switch is turned on, the output control unit 2 controls the high-voltage power supply unit 4 to turn on and off at a preset cycle by the timer control of the output time setting unit 3. Alternately.

By this notification, the high-voltage power supply section 4 receives the power receiving terminal 5
The input power source is processed, a power source for microwave oscillation such as a high voltage power source is intermittently supplied to the microwave oscillating unit 6 as a microwave generating source, and the oscillating unit 6 is driven intermittently (intermittently). . Due to this driving, the microwave oscillating unit 6 causes the microwave dissociation current mixing unit 8 via the non-contact type cavity coupler 7.
The microwave output MW for surgery is intermittently (intermittently) supplied at a constant cycle.

When the start switch 2 is turned on, the tissue dissociation control unit 9 is operated via the output control unit 2 and the output time setting unit 3.
To the microwave dissociation current mixing unit 8 via the control unit 9 and the DC tissue dissociation current output DC of the DC power supply 10 is continuously supplied to the microwave dissociation current mixing unit 8.

The mixing section 8 is formed by, for example, a microwave / DC mixer using a microwave filter combined with a T-type stub and a feedthrough capacitor, and outputs a microwave to the tissue dissociation current output DC. The MW forms a mixed output with intermittent superposition. Then, this mixed output is supplied to the surgical electrode 12 via the coaxial cable 11.

The surgical electrode 12 is inserted into, for example, a tumor tissue, and the microwave power MW is intermittently supplied, so that the surgical electrode 12 shown in FIG.
Tumors with high relative permittivity are obtained by intermittently irradiating the tissue with the microwave dielectric heat energy shown in the intermittent part a, and repeating the dielectric heating while suppressing the evaporation of microwaves of water contained in the tumor tissue. Irradiation of microwave energy is continued while sufficiently increasing the temperature of water in the tissue to, for example, about 60 ° C., and at the same time,
By supplying the tissue dissociation current output DC, an appropriate tissue dissociation current of, for example, 15 mA in the direction in which the central conductor of the electrode 12 is the negative (negative) pole and the outer conductor is the positive (positive) pole is applied to the continuous hatched portion B in FIG. It is continuously applied to the tissue as shown to prevent the electrode 12 from adhering to the tissue.

As a result, a tumor tissue having a diameter of about 3 cm, which was conventionally inoperable without laparotomy, was hemostatically coagulated without carbonization, and a coagulated necrotic mass was obtained. Therefore,
The efficiency of surgery is greatly enhanced, and hemostatic coagulation of tumor tissue can be performed without laparotomy using a puncture electrode.

The output control unit 2, the output time setting unit 3,
The microwave dissociation current mixing unit 8 and the tissue dissociation current control unit 9 form a power supply control means. Further, when one preset operation time ends after the start switch 2 is turned on, the output time setting unit 3 notifies the output control unit 2, the tissue dissociation control unit 9 and the like of an off command, and the start switch 2 The device will automatically stop without pressing again.

The intermittent period and the magnitude of the microwave output MW are varied by adjusting the output time setting unit 3 and the oscillating unit 6, and the tissue dissociation current output DC is the DC power supply 10.
And the like, and are set to appropriate values according to surgical conditions and the like.

Furthermore, in the above embodiment, the case where one surgical electrode is provided has been described, but a plurality of surgical electrodes may be provided and the output of the mixing section 8 may be supplied to these electrodes simultaneously or selectively. . The configuration of each unit is not limited to the embodiment.

[0021]

Since the present invention is configured as described above, it has the following effects. By the control of the power supply control means, the microwave output of the microwave generation source (microwave oscillator 6) is intermittently (intermittently) supplied to the surgical electrode 12, and the dissociation current output of the DC power source 10 is applied to the surgical electrode. Since it is continuously supplied to the tumor electrode 12, the tumor tissue or the like into which the surgical electrode 12 is inserted is intermittently irradiated with microwave energy, and water in the tissue is kept above a certain temperature to suppress carbonization thereof and hemostatic coagulation. Etc., and moreover,
During that time, a dissociation current is continuously applied to constantly prevent the adhesion between the electrode and the tissue, which enables non-laparotomy for large tumor tissue, which has been impossible in the past.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a microwave surgical apparatus of the present invention.

2 is an explanatory diagram of microwave energy irradiation of the surgical electrode of FIG. 1 and conduction of a tissue dissociation current. FIG.

[Explanation of symbols]

 2 Output control unit 3 Output time setting unit 6 Microwave oscillating unit 8 Microwave dissociation current mixing unit 9 Tissue dissociation control unit 10 DC power supply 12 Surgical electrode

Claims (1)

(57) [Claims] 1. A microwave generation source for generating a microwave output for surgery, a DC power source for generating a DC tissue dissociation current output, and the microwave output intermittently supplied to an operation electrode for the tissue dissociation. A microwave surgical apparatus, comprising: a power supply control unit that continuously supplies a current output to the surgical electrode.