JPH034847A - Blood clotting hemostatic device - Google Patents

Abstract

PURPOSE:To avert the rise of temp. and to prevent the transfer of the heat from blood vessels to the tips of pincers so as to provide a sure hemostatic effect by disposing electrically insulating sintered bodies of low thermal conductivity which prevent the scorching and sticking of a living body to the crimping parts of the terminals of the pincers. CONSTITUTION:Contact parts 10a, 10a having an insulating characteristic are mounted by a conductive adhesive agent to blood vessel crimping materials 10, 10. The contact parts 10a, 10a are constituted of the sintered bodies (ceramics), such as zirconia, having the electrical insulating characteristic. The materials having high corrosion resistance and extremely high hardness are used for the sintered bodies. The heat generated by flowing of a high-frequency current from the exposed electrodes 10b, 10b to the blood vessels, therefore, has the extremely low degree of radiating by transferring in the contact parts 10a, 10b consisting of the sintered bodies, thereby preventing the scorching of the tissue of a part of the cauterized blood vessels to the surfaces of the contact parts 10a, 10a. Many small holes are bored in a dispersed state in the contact parts 10a, 10a and the many exposed electrodes 10b, 10b are required to be exposed and to be brought into contact with the blood vessels in order to enhance the above mentioned effect.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a blood vessel coagulation and hemostasis device for stopping bleeding from blood vessels during neurosurgical, orthopedic, and general surgical operations.

[Conventional technology and its problems]

Conventionally used bipolar blood vessel coagulation and hemostasis devices use high-frequency current, and the frequency used is 0.5 to 3M.
Spark gap types that generate high frequencies in the Hz range are often used. This bipolar type electrode has both an active and an inactive electrode at each end of a hand-held forceter, which energizes only the biological tissue pinched by the tip of the forceter and prevents electrical stimulation of the patient from coagulating. limited to the desired area,
Bleeding from blood vessels can be completely stopped without damaging other tissues. That is, the hemostasis effect is achieved by coagulation of blood vessels due to local heating caused by high-frequency current flowing through living tissue.

However, most of the materials that have been used in the past have been made of stainless steel, but recently, lightweight, corrosion-resistant titanium ones have also been made. These metal inserts have high thermal conductivity and tend to transfer heat easily. As a result, the locally heated blood vessel heat is transferred to the metal receptacle, and the tip of the receptacle gradually becomes hotter as it is used, causing scorching between the blood vessel and the metal at the end of the receptacle, causing the blood vessel to burn. Part of it is attached to the tip of the separator. As a result of this adhesive force being greater than the coagulation force between blood vessels, when opening the tip of the forceps after coagulating the blood vessels, even the coagulated portions of the blood vessels are often peeled off and removed. The problem was that the tube would reopen and fail to stop the bleeding. Moreover, it is necessary to scrape off and clean the burnt deposits on the surface of the contact part (electrode) in preparation for the next use, and the scraping and polishing can change the shape of the tip of the separator and reduce accuracy. It was a problem.

[Means for solving problems]

In order to solve the above-mentioned problems, the most effective means is to use an electrically insulating sintered material such as zirconia, which has low thermal conductivity, to prevent living organisms from burning or adhering to the clamping part of the tip of the separator. By exposing the electrodes made of conductive adhesive material from the conductive sintered body,
This prevents temperature rise, prevents heat from the blood vessels from being transmitted to the tip of the forceps, and provides reliable hemostasis.

〔Example〕

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

Figure 1 shows the overall configuration of a bipolar blood vessel coagulation and hemostasis device.
Reference numeral 1 denotes a forceps for clamping blood vessels and coagulating them to stop bleeding.The tip A of this forceps 1 is a blood vessel clamping member 10.1 made of metal such as stainless steel or titanium, as shown in an enlarged view in FIG.
0, and the inner surface of the blood vessel clamping member 10.10, that is, the contact portions 10a, 10a that actually contact the blood vessel B.
is made of an electrically insulating sintered body, and this contact portion 10
An exposed electrode 10b made of a conductive adhesive is exposed at 10a and 10a. Further, reference numeral 2 denotes a power supply device for generating high-frequency current, and this power supply device 2 is designed to turn on and off electricity to a separator 1 to which a cord 4 is connected by stepping on a foot switch 3. . As the conductive adhesive, conductive resin Dotaibi (trademark) manufactured by Ukkura Kasei ■ was used. It uses high-purity silver powder as the conductive filler and epoxy resin with excellent heat resistance as the resin, and is a solvent-free type with a solid content of 100x.
- A liquid adhesive whose main properties are as shown in Table 1 was used.

Table 1 By the way, insulating contact parts 10a, 10a are attached to the blood vessel clamping member 10.10 with a conductive adhesive. These sintered bodies are made of ceramics, which have great corrosion resistance and are extremely hard materials.

For example, the thermal conductivity of a zirconia sintered body is 0.0 at 20°C.
09cal-cm/cm"-sec-"c, stainless faI0.039cal-cm/cm"
-5ec ・"C, 0 of titanium, 04cal -
cm/cm"-5ee-'C, and its heat conductivity is lower than that of these metal materials. Therefore, the heat conductivity generated by the high-frequency current flowing from the exposed electrodes 10b, 10b to the blood vessels. Since the degree of heat dissipation through the contact parts 10a, 10a made of sintered bodies is extremely small, the part of the tissue of the cauterized blood vessel will not become scorched on the surface of the contact parts 10a, 10a.

In this case, an insulating contact portion 1 made of a zirconia sintered body
A small hole was bored in 0a, the conductive adhesive was filled in the small hole, and the abutment part 10a was adhesively fixed to the tip of the blood vessel clamping member 10, and simultaneously exposed from the small hole on the surface side. If the ratio of the electrode area of the exposed electrodes tab and lOb to the area of the contact part 10a is 60X or more, the mechanical strength of the contact part 10a made of ceramic will be small, while if it is less than 5%, a good cauterizing hemostatic effect cannot be obtained. This was confirmed in a trial experiment.

In addition, in order to enhance the effect, the contact portion IQa is made of an insulating sintered body as much as possible, avoiding a local temperature rise.
, it is necessary to make a large number of small holes in a dispersed state in the IOa to expose a large number of exposed electrodes 10b, 10b and bring them into contact with blood vessels. As a method for easily exposing the exposed electrodes to the small holes, the exposed electrodes 10b, 10b themselves are made of a conductive adhesive, so that the abutting portions 10a, 10a can be easily exposed.
At the same time, it is possible to fix the blood vessel clamping member 10.10 to the blood vessel clamping member 10.10, resulting in a very high productivity.

In addition, the surfaces of the abutting portions 10a, 10a need to be polished to a mirror-like surface with a surface roughness superior to Ins, considering the ease of peeling off charred deposits.

In addition, the hardness of zirconia ceramic is Vickers hardness 1
At 250 kg/mm" or more, the hardness is incomparably higher than that of metal materials such as stainless steel and titanium, so it appears that some tissue of the blood vessel is strongly charred to the contact parts 10a and 40a made of such sintered bodies. Even in such cases, the deposits could be easily scraped off by scraping with the edge of a knife, etc., without damaging the contact surface.

〔Effect of the invention〕

As described above, the bipolar blood vessel coagulation and hemostasis device equipped with a forceps according to the present invention provides the following effects.

■Since hemostasis can be reliably performed during surgery, surgical time can be significantly shortened.

■It can reduce the amount of bleeding and reduce the need for shallow surgery for patients.

■Not only does it save you the trouble of scraping off the burnt-on deposits on the tip of the receptacle, but even if it does, it can be easily scraped off, and because it is highly hard, there is no risk of the shape changing, providing high precision. can be maintained for a long period of time.

■By using a conductive adhesive as an electrode, it is possible to easily mold a complex electrode shape, making it extremely productive.

■By using an adhesive, the thermal stress generated due to the difference in thermal expansion coefficient between metal and ceramic during autoclave sterilization can be absorbed by the adhesive layer, preventing damage to the ceramic that makes up the contact part. It can withstand long-term use and can be sterilized in an autoclave without using the gas sterilization method, making it possible to significantly shorten sterilization time.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the overall configuration of a blood vessel coagulation and hemostasis device according to the present invention, and FIG. 2 is an enlarged perspective view of a convex portion in FIG. 1. 1: Separator 2: Power supply device 3: Foot switch 4: Cord 10: Blood vessel clamping member 10a: Contact portion 10b: Exposed electrode

Claims (1)

[Claims] In a bipolar hemostasis device that causes a high-frequency current to flow from one of two forceps to the other from a power supply device and cauterizes a blood vessel sandwiched between both forceps to stop bleeding, a blood vessel that is in contact with at least the blood vessel of the above-mentioned forceps. An electrically insulating sintered body with low thermal conductivity is disposed in the clamping part, and an exposed electrode is provided on the surface of the electrically insulating sintered body, exposing 5% to 60% of the area of the contact part of the blood vessel clamping part. A blood vessel coagulation and hemostatic device characterized in that, and the exposed electrode is formed of a conductive adhesive.