JPH08191838A - High frequency dielectric type heating knife - Google Patents

Abstract

PURPOSE: To reduce the stimulation to the nerve or mulscle tissue of a human body by controlling the heating temp. of a metal blade by forming the metal blade heated by high frequency current supply from an electrically good conductor and coating the surface thereof with a resin composed of a dielectric material or ceramic. CONSTITUTION: A high frequency dielectric type heating knife M is constituted of a blade part having a blade 3 composed of a conductive metal and a handle part 2 constituting a handle. In this case, the surface of the metal blade 3 of the blade part is coated with a resin composed of a dielectric material or ceramic and, if necessary, double cavity parts 20a, 20b are formed in the metal blade 3 and cooling water is forcibly refluxed to the cavity parts 20a, 20b from the outside of the metal blade 3 during high frequency current supply to prevent the overheating of the metal blade 3. Further, a high frequency generator is subjected to feedback control corresponding to the output of the temp. sensor embedded in the metal blade 3 to keep the heating temp. of the metal blade 3 constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blood clot on a blade of a surgical knife during surgery, endoscopic surgery or catheter surgery without directly stimulating the neuromuscular tissue of the patient. The present invention relates to a high-frequency dielectric heating knife (electric knife) capable of minimizing the adherence of coagulated substances, preventing carbonization of human body tissue, and safely cauterizing and bleeding lesion tissue.

[0002]

2. Description of the Related Art A conventional surgical electric scalpel coated with conductive Teflon to prevent the attachment of living tissue is
As shown in FIG. 6, a flexible conductive Teflon 32 is provided at the tip of the insertion portion 31 which is inserted by moving the slider 34 of the operation portion 33 into the body cavity of the patient via an endoscope or the like. ,
The treatment electrode 32 is brought into contact with the diseased tissue in the body cavity and a high-frequency current is passed through the treatment electrode 32 to cauterize polyps and the like in the lesion. (For example, Japanese Patent Laid-Open No. 4-30
7055 gazette). Here, in this kind of electric scalpel,
The treatment electrode is brought into direct contact with the diseased tissue, for example, 200K
By applying a high-frequency current of a relatively low frequency of about Hz to 500 KHz, the contact tissue is heated / cauterized by Joule heat generated according to Ohm's law, thereby making an incision / hemostasis.

[0003]

However, in such a conventional electric scalpel, a high-frequency current of low frequency passes through the body of the patient, so that the nerves and muscles of the human body are stimulated to cause tissue contraction. The use of electrocautery will be limited in such contractions.

Further, since the rough surface of the conductive Teflon film (conductive film) of the treatment electrode is in direct contact with the human body tissue, the coagulation or thrombus of the tissue becomes conductive as the metal particles of the conductive film are heated by the high frequency current. It takes a lot of time and effort to adhere to the surface of the film and remove the adhered material from the conductive film.
Further, the temperature of the contact point between the metal particles in the conductive film of the treatment electrode and the tissue reaches a high temperature of several hundreds of degrees, and as a result, the carbonization phenomenon of the incised tissue occurs, which causes the prolongation of wound healing.

Therefore, in the high-frequency dielectric heating scalpel of the present invention, the heating temperature of the metal blade can be controlled to minimize stimulation to human nerves and muscle tissues and to prevent blood coagulation from adhering to the metal blade. Try to reduce the amount and prevent carbonization of the tissue.

[0006]

High frequency current from a high frequency generator applied to the body of a patient (frequency of 10 MHz or more)
In a high-frequency dielectric heating knife with a metal blade heated by, the metal blade is molded with a material that is an electrically good conductor,
In addition, the surface of the metal blade is coated with a resin or ceramic made of a dielectric material. Further, a temperature sensor is embedded in the metal blade, and the temperature sensor is connected to the feedback circuit of the high frequency generator to automatically control the high frequency output to keep the heating temperature of the metal blade constant.

Further, a double hollow portion is formed inside the metal blade, and cooling water is forcibly perfused into the hollow portion from the outside of the metal blade during high-frequency current application to prevent overheating of the metal blade.

[0008]

According to the above-mentioned means, in the high frequency induction heating knife of the present invention, a high frequency of 10 MHz or more generated by the high frequency generator between the counter electrode plate in contact with the body surface of the patient and the metal blade of the knife in contact with human tissue. When energized, a high frequency electric field is generated by sandwiching the resin or ceramic, which is a dielectric material that covers the surface of the metal blade. Then, according to the principle of high-frequency dielectric heating, the metal blade of the scalpel and the human body tissue in contact with it simultaneously generate heat. At this time, the temperature sensor embedded in the metal blade detects the heating temperature of the metal blade, and the detected value is fed back to the high frequency generator to automatically control the high frequency output to a predetermined value to keep the tissue at the optimum temperature. Prevent carbonization of. Also, at this time, if cooling water is forcibly perfused inside the metal blade, only the deep part of the tissue is heated, and thrombus or
Adhesion of coagulum is minimized.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the high frequency induction heating knife of the present invention will be described below with reference to the accompanying drawings. [First Embodiment] A first embodiment of the high-frequency dielectric heating knife of the present invention will be described with reference to FIGS.

As shown in FIG. 1, the high frequency dielectric heating knife M of the first embodiment comprises a blade portion 1 having a metal blade (blade) and a handle portion 2 constituting a handle. The blade portion 1 is an electrically conductive metal blade 3 formed of a solid metal body, and a resin (Teflon fluorine compound etc.) thin film 4 made of a dielectric material covering the surface of the metal blade 3.
The temperature sensor tip portion 5 electrically connected to the temperature sensor main body 7 is embedded in the metal blade 3 so that the heating temperature of the metal blade 3 can be detected. A ceramic thin film may be coated instead of the resin thin film.

On the other hand, the handle portion 6 of the blade portion 1 is inserted into the solid body 2a of the handle portion 2 made of a suitable material for holding the blade portion 1, and the temperature sensor body 7 is inside the handle portion 6. Is electrically connected to the transmission line 10 to the temperature control circuit via the output terminal 8 of the temperature sensor disposed in the.
Further, an adapter 6a is fitted in the blade handle portion 6, and the adapter 6a is connected to a power transmission line 9 from the electric frequency generator. The cross section of the metal blade 3 is shown in FIG.
As shown in FIG. 3, the temperature sensor tip 5 is embedded in a solid metal blade 3 having an oval shape, for example, and the surface of the metal blade 3 is coated with a thin film 4.
As shown in FIG. 3, the handle portion 2 has a handle body 2a in which the handle portion 6 of the blade portion 1 is inserted and fitted, as shown in FIG.
A temperature sensor body 7 is embedded in the handle 6.

In the case of treating a lesion area of a patient with the high-frequency dielectric heating knife M constructed as described above, FIG.
As shown in FIG. 3, the patient H is laid down on the counter electrode 11 and the high-frequency dielectric heating knife M is fed to the feedback circuit including the high-frequency generator 12, the electric controller 13, the output monitor device 14, and the temperature control circuit 15. Is connected via a transmission line 10.

When a high frequency current of, for example, 10 MHz or more is applied to the high frequency generator 12, the potential is controlled by the potential control device 13 and the output monitor device 14, and the current is continued while monitoring the output, the metal of the heating knife M is A high-frequency electric field is generated by sandwiching the resin film (or ceramic film) 4 of the blade 3, and the human tissue in contact with the metal blade 3 is simultaneously heated according to the principle of dielectric heating. This high frequency generator 1
2 includes an automatic impedance matching circuit in addition to the above feedback circuit.

At this time, the tip portion 5 of the temperature sensor embedded in the metal blade 3 detects the heating temperature of the metal blade 3 and transmits it to the temperature control circuit 15 via the transmission line 10 to generate the high frequency generator 1.
The high frequency output of 2 is automatically controlled to maintain the heating temperature of the metal blade 3 at a predetermined temperature (for example, 300 degrees or less). As a result, it becomes extremely easy to perform incision and hemostasis of the tissue at the lesion site. [Second Embodiment] A second embodiment of the high frequency dielectric type heating of the present invention will be described with reference to FIG.

In the second embodiment, a cooling water perfusion device is incorporated in the metal blade 3 of the high frequency dielectric heating knife M shown in the first embodiment. Here, the description of the same configuration as that of the first embodiment is omitted.

That is, as shown in FIG.
Forming double cavities 20a, 20b in the metal blade 3 of
The tips of the cavities 20a and 20b are connected to a cooling water inlet 22b and a cooling water outlet 23b arranged in the handle 2. The cooling water inlet 22b and the cooling water outlet 23b are connected to the cooling water inlet 22 and the cooling water outlet 23 of the injection pump 24 via the flow rate controller 21,
It is connected to the outside of the system via a cooling water inlet 22a and a cooling water outlet 23a provided at the inlet of the injection pump 24. Further, the power transmission line 9 from the high frequency generator and the transmission line 10 to the temperature control circuit are connected to the adapter 6b fitted in the handle portion (handle portion) 2 of the metal blade 3 to form the heating knife of the first embodiment. Similarly, while monitoring the heating temperature of the metal blade 3, a high-frequency current is applied to incise the tissue of the lesioned part to stop the bleeding.

In particular, in the heating knife M of the second embodiment, the injection pump 24 is driven while energizing the metal blade 3 with a high-frequency current to inject the cooling water into the cavities 20a, 20b in the metal blade 3. It is injected from the inlet 22b and the cooling water outlet 23
It was discharged from b and forcedly perfused. As a result of the perfusion of this cooling water, overheating of the metal blade 3 and the tissue surface of the human body is prevented, dielectric heating of only the deep portion of the tissue is possible, adhesion of blood coagulation to the metal blade is reduced, and carbonization of the tissue is achieved. Will be prevented.

[0018]

As described above, in the high-frequency dielectric heating knife of the present invention, current does not directly flow through the human body tissue in contact with the insulating-coated electric knife and a high-frequency electric field of 10 MHz or more is applied to this portion. It will only occur. Therefore, the nerves and muscle tissues of the human body are not stimulated and their contraction does not occur. In addition, since the surface of the metal blade is coated with a smooth resin or ceramic, blood or tissue coagulation hardly adheres to the surface of the metal blade even when the metal blade is heated. Therefore, the metal blade can be repeatedly used, and even if the solidified material from the tissue adheres to the surface of the metal blade, it can be easily wiped off. Furthermore, since the heating temperature of the metal blade can be set arbitrarily, carbonization of the tissue of the human body can be prevented, and the repair process is not disturbed. Therefore, it is possible to provide a useful electric scalpel that is clinically highly reliable and safe.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of a high-frequency dielectric heating knife of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of the high-frequency dielectric heating knife shown in FIG.

[FIG. 3] III-II of the high-frequency dielectric heating knife shown in FIG.
I A cross-sectional view taken along the arrow.

FIG. 4 is an overall device configuration diagram when the high-frequency dielectric heating scalpel of the present invention shown in FIG. 1 is used for treatment.

FIG. 5 is a longitudinal sectional view of a second embodiment of the high-frequency dielectric heating knife of the present invention.

FIG. 6 is a schematic view of a conventional electric knife for surgery.

[Explanation of symbols]

 M high frequency dielectric heating knife 1 blade part 2 handle part 3 metal blade 4 resin film 5 temperature sensor tip part 6 blade handle part 7 temperature sensor body 8 temperature sensor output terminal 9 power line from high frequency generator 10 to temperature control circuit Transmission line 11 Counter electrode 12 High frequency generator 13 Potential controller 14 Output monitor 15 Temperature controller

Claims (4)

[Claims] 1. A high-frequency dielectric heating knife having a metal blade that is inserted into a body cavity of a patient and heated by applying high-frequency electricity to a high-frequency generator, wherein the metal blade is made of a material that is an electrically good conductor, A high frequency dielectric heating knife in which the surface of the metal blade is coated with a resin or ceramic made of a derivative. 2. A temperature sensor is embedded in the metal blade, and the temperature sensor is connected to a feedback circuit of the high frequency generator to automatically control the high frequency output to a predetermined value to control the heating temperature of the metal blade. The high-frequency dielectric heating knife according to claim 1, which is kept constant. 3. A double cavity is formed inside the metal blade coated with the resin or ceramic, and cooling water is forcibly perfused into the cavity from the outside of the metal blade during high-frequency current application. The high-frequency dielectric heating knife according to claim 1, wherein the metal blade is prevented from overheating. 4. The high frequency dielectric according to claim 1, wherein said high frequency generator generates a high frequency current of 10 MHz or more capable of dielectric heating and has an automatic impedance matching circuit and a feedback circuit for heating temperature control. Mold heating knife.