JPS6072545A - Heating knife - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating scalpel made of single crystal alumina.

BACKGROUND ART Traditionally, scalpels made of stainless steel or the like and having a sharp blade are most commonly used.

However, since a part of the living tissue is incised in a surgical operation, it is impossible to avoid cutting of capillaries, in particular, that are distributed within the tissue. For this reason, many severed capillaries constantly bleed, which not only reduces the amount of blood in the body, but also accumulates at the incision site where surgery is to be performed, making it difficult to make further incisions while keeping a close eye on the incision site. This makes it impossible to move the needle, which poses a serious hindrance to performing delicate surgeries that require high precision. Bleeding during surgery must be wiped off frequently with an absorbent material such as a wet sponge during the surgery, so it is necessary to have an assistant separate from the surgeon to wipe up the bleeding. There is,
In addition, the repeated temporary suspension of the surgery impedes the rapid progress of the surgery. Therefore, for the purpose of hemostasis, devices such as heating with an electric wire heater or cautery (cautery) that is pressed against the incision of the living body to stop the bleeding may be used. However, such instruments are used to stop bleeding by pressing against the cut surface immediately after cutting with a scalpel, so although they have the advantage of being able to seal relatively large blood vessels and stop bleeding, they do not stop bleeding separately from the act of cutting. This is extremely troublesome.

Therefore, when partially incising a living tissue in order to eliminate such inconveniences, a scalpel having both a cutting action and a hemostasis action is used. Zunawaji is a high-frequency discharge scalpel that uses the heat generated by the spark discharge caused by high-frequency current to cut and coagulate blood to stop bleeding, as well as a blade member made of a metal plate with a heating device attached to one side. There is a heated scalpel that cuts living tissue with a heated blade and destroys capillaries with heat to stop bleeding. However, in the discharge type electric scalpel mentioned above, the scalpel itself forms one electrode, and the living body to be incised forms the other electrode, and because the discharge between the two electrodes is easily cut by heat, there is a uniform potential. If this is not the case, the cutting characteristics will change, and the cutting depth will change significantly depending on the moving speed (cutting speed) of the scalpel, making it impossible to use it for surgery on minute areas. As described above, the discharge type electric scalpel has disadvantages such as a significant delay in healing and recovery of the 9J wound due to the scorched and damaged living tissue due to thermal cutting (burning) based on the discharge.

On the other hand, in a heated electric scalpel that cuts living tissue by heating the blade to 200 to 500°C using an electric heat generating means attached to the metal blade member, cutting is performed using the shearing force acting on the blade. However, since the heat generated by the contact of the blade destroys blood vessels and brings about a hemostasis effect, it is relatively difficult to perform surgery on minute areas. Since the blade is heated to about 0.degree. C., the hardness of the blade gradually softens, and its cutting characteristics tend to deteriorate. Moreover, the electrical heating means, that is, the heating resistor that generates Joule heat, is embedded in an insulator such as ceramic and attached to the metal plate that is the blade member, so the heating resistor generates Joule heat. Heat is difficult to transfer to the blade member, so when the blade comes into contact with living tissue, the temperature drops rapidly and does not provide sufficient hemostasis. Due to the structure in which the resistor is embedded, the overall thickness of the blade is large, and the width of the blade cannot be made large, making it difficult to obtain a scalpel that can cut deep into living tissue.Furthermore, since the blade member is metal, Parts of living tissue, such as cut pieces of meat, are easily burnt, oxidized, and rusted, which deteriorates the sharpness of a scalpel.In addition, the structure is complex and requires many production steps, which reduces productivity. It had many disadvantages, such as low energy consumption and relatively high cost, so it was not widely used.

The present invention was developed in particular in view of the drawbacks of heated electric scalpels as described above, and provides an inexpensive scalpel with excellent cutting properties and hemostasis, as well as an extremely simple structure and excellent productivity. It is something to do with Mr.

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

FIG. 1 shows a cutaway view of the cutting edge A of the electric scalpel according to the present invention, and FIG.
Reference numeral 1 denotes a blade member made of single crystal alumina, and an acute-angled blade 2 is formed at the edge αIl1 of this blade member 1. Also,
3 is a heating resistor pattern that is directly attached and formed on one side of the blade portion + the main surface of the AI, and the method for forming this heating resistor pattern 3 is to use materials such as tungsten, nickel, molybdenum, manganese, cobalt, etc. A preset calorific value can be obtained by using metallization paste (ink), which is made by kneading fine metal powder alone or in a composite with glass component powder, organic solvent, binder, etc. in a predetermined ratio. After coating by screen printing method to form a heating resistor pattern 3 having a resistance value such that the temperature distribution of the blade 2 is similar to that of the heating resistor pattern 3, the heat generating resistor pattern 3 is coated with a reducing atmosphere at 800-1200°C. It is formed by sintering inside.

In this case, the boulder on which the cutting edge A is detachably attached
The contact portion 4 that connects to the current-carrying terminal (not shown) at 11 is continuous with the heating resistor pattern 3, and when printing the pattern 3, it is printed at the same time with the same paste. It has a relatively high electrical resistance value. Therefore, in order to provide the contact portion 4 with good conductivity and to achieve a more complete electrical connection, it is recommended that the contact portion 4 be plated with gold on a nickel plating base.

The heating resistor pattern 3 provided on the blade member 1 made of single-crystal alumina is not limited to the printing method using the base plate described above, but the heating resistor pattern 3 in a predetermined shape can also be formed by a vapor deposition method, a patterning method, etc. can do.

The blade part + AI in which the heating resistance pattern 3 is formed in this way
An insulator layer 5 made of a ceramic coat layer, fluororesin, epoxy resin, or the like is adhered to protect the pattern 3 and provide electrical insulation.

By the way, the blade member constituting the knife according to the present invention is made of single crystal alumina such as sapphire or ruby (/II, 0
3> is used, and sapphire is a transparent dense body with a Vickers hardness of 2.300 kg/+i+1 and a bending strength of 7.000 kg/cnl, and has great mechanical strength, heat regeneration properties, corrosion resistance, and It has extremely excellent properties as a blade member that makes up a scalpel, such as having excellent high-frequency electrical insulation properties. The appropriate forming angle (center angle) of the blade 2 formed in the blade member using such single crystal alumina is 5 to 35 degrees.

As mentioned above, the heating resistor pattern 3 directly attached (painted) to one side of the blade member 1 made of a treated single crystal alumina is energized through the contact portion 4 through the holder 11. As a result, the blade 2 is heated by the heat generated from the pattern 3, so that when cutting living tissue with the blade 2, the heat acts to seal the cut portion of the blood vessel and suppress bleeding.

In the above embodiment, the case where the heat generating resistor pattern 3 is provided only on one side of the blade member 1 has been described, but this is not limited to the case where a higher heating temperature is required or the other resistor pattern is provided with a temperature sensor. If the pattern is desired to be used as a storage device, it may be attached to both sides, or a plurality of separate and independent patterns may be attached to the same side. It can also be used as cyathylmy by applying pressure to the bleeding point of a small blood vessel with the tip of the back of a heated scalpel while irrigating it with physiological saline.

In addition, in cases where the heating resistor pattern is made of a metal rice paste made of fine powder of metals such as tungsten, nickel, and copal 1, the heating resistor pattern has a relatively large temperature coefficient of resistance. The pattern itself has some self-temperature adjustment function, but in order to control the temperature of blade 2, a separate power supply is used to automatically or manually control the current flowing through the heating resistor (without flowing through turn 3). This can be done easily by making a wall.

As described above, in the present invention, a heating resistor pattern is attached directly to at least one side of the blade part (A) made of single crystal alumina having excellent cutting characteristics, and the blade is heated by applying electricity to the noiturn to cut biological tissue. Since it is designed to cut, it not only has a hemostatic effect by carving into the cut living tissue, but also has an extremely thin cutting edge that allows deep cutting, and is highly heat resistant. It has a long lifespan as a scalpel, with no deterioration in its cutting characteristics, and it is difficult for cut pieces of meat to stick together.

Further, since the structure is extremely simple, it is possible to provide a heating scalpel with many features such as being able to be manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is a partially broken sectional view showing an example of a heating scalpel according to the present invention, and FIG. 2 is a sectional view taken along the Meme line in FIG. A: Blade tip 1: Blade member 2: Blade 3: Heat generating resistance pattern 4: Contact portion 5: Insulator layer 11: Holder applicant Kyocera Corporation Representative Kazuo Inamori

Claims (1)

[Claims] A heating scalpel characterized in that a blade is formed on a blade member made of single crystal alumina, and a heating resistor pattern is provided on at least one side of the blade member.