JPS5873367A - Plastic forceps - 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 nine forceps that are made of DK plastic instead of metal as a base material.More specifically, the present invention relates to a nine forceps that is made of DK plastic as a base material instead of metal. Regarding forceps.

Conventionally, medical forceps have a structure and material that conform to JIS-T-2302K. The material is JI
845CS-855C, a carbon steel material for mechanical structures specified in 8-G-4051, is used, but it requires time and effort to process, and the forceps are expensive. (9) As laser scalpels have come into widespread use in recent years, there is a danger that the laser beam may reflect off the metal forceps and enter the medical eye, so safety measures are urgently needed. Therefore.

Attempts have been made to replace forceps with plastic that is easy to mold and does not reflect laser beams, but because it is necessary to use plastic that can withstand high-pressure steam sterilization and has fewer leachables, plastic forceps are no longer used in Japan. In Germany, Sweden, etc., which have not yet been developed, filler a6-pyrene and Borlig tetrapyrene are used in some glass forceps, but since they cannot withstand high-pressure steam, they must be sterilized at low temperature beforehand. Mourning items are used as disposable items. Low-temperature gas sterilization methods include gas sterilization using ethylene oquinide or formaldehyde; and rm radiation sterilization using Paltro 0. In the gas sterilization method, ethylene oxide or formaldehyde remains in disposable products, and in order to remove this, airage is carried out in a chamber after carbonization, but it usually takes 10 to 14 hours for the residual gas to disappear. It takes several days. i9. Radiation sterilization has a large physical and chemical effect on materials, resulting in problems such as deterioration of physical properties and increase in eluates.

Furthermore, radiation sterilization is difficult to operate, and there are currently only two R-ray sterilization facilities in Japan that have been approved by the Ministry of Health and Welfare. From the above, it can withstand high pressure steam sterilization,
Moreover, it is desired to develop plastic forceps with less eluate.

As a result of intensive study in response to such requests, the inventor Goto has found that
The use of aromatic polysulfone as a base material has made it possible to provide plastic forceps that have very good mechanical properties, can withstand high-pressure steam sterilization, and have little eluate.

In other words, the purpose of the two-pronged IR is to use an aromatic polysulfone having a divalent aromatic group represented by the general formula m (which may be joined by a valent aliphatic group) as a base material. Regarding plastic forceps. These plastic forceps have excellent mechanical properties, can withstand high-pressure steam sterilization, and have little eluate.

The aromatic polysulfone used in the present invention is a polymer whose main structural unit is represented by the general formula (11).

A preferred example of a divalent aromatic group that may not be linked to an aliphatic group is a polysulfone consisting of repeating units represented by the general formula (I[) of Union Carbide Company, USA. I can give an example.

The method for forming the forceps used in the present invention is as follows.

Generally known glass molding methods such as press molding, injection molding, and extrusion molding can be applied.

Among these, injection molding is preferred. Furthermore, it is preferable to use a vent type injection molding machine in order to reduce elution from the molded product.

Hereinafter, the present invention will be explained in more detail with reference to Examples.
These are illustrative and do not limit the scope of the invention.

Examples Various test pieces and forceps were molded from polysulfone pellets manufactured by Union Carbide, USA, using a vented injection molding machine manufactured by Toshiba Machinery. Table 1 shows the molding conditions. The heat distortion temperature of the obtained molded article was 148°C. Tensile strength 9
Table 2 shows the retention of elastic modulus and impact strength at 130°C and high pressure steam.
[K] Repeated tests were conducted under the same sterilization conditions.

Table 3 shows the details of the carpets. Sterilize 300 times under the conditions in Table 3.
Although it was repeated, there was no change in appearance and there was no problem in practical use.

Also, molded product 15? cut into strips of 10 squares or less,
Extractables test was conducted based on Ministry of Health and Welfare Notification No. 3011)K. The results are shown in Table 4. There was almost no eluate, which satisfied the standards of the Ministry of Health and Welfare.

1m! I Injection molding conditions * Izots, notches Table 3 Sterilization conditions (1 cycle) Soaking 4 @ Extrusion test results The plastic forceps based on aromatic polysulfone according to the present invention can be sterilized using high-pressure steam as shown in the examples. It is durable and has little eluate. Additionally, it is injection moldable and can be formed into containers other than conventional carbon steel materials.

Claims (1)

[Claims] 1. General formula (1) represents a divalent aromatic group which may not be linked to the aliphatic group of 241. ) Glass forceps made of aromatic polysulfone having a barbed unit as a base material. 2. The plastic forceps according to claim 1yL, wherein the aromatic polysulfone is represented by the general formula (1).