JPS59118129A - Curved part cover for endoscope - 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 curved outer skin for an endoscope.

Endoscope is a general term for optical instruments for diagnosing various lesions or performing tissue biopsies such as the stomach, esophagus, duodenum, large intestine, colon, and fiberoptic bronchoscope. Since this endoscope is used particularly inside a body cavity, it is required that there is no possibility that substances harmful to the human body will be extracted, and that it is resistant to disinfectants, system liquids, etc.

As shown in Fig. 1, an endoscope consists of an operating section main body 1 that allows various operations to be performed at hand, and a flexible long body cavity insertion section 2 that is inserted into a patient's body cavity. ing. Operation unit body 1
is equipped with an eyepiece 3, an operation knob 4 for bending, an inlet 5 for using forceps and other tools, an air/water supply button 6, a suction button 7, etc. A light guide 8 connected to the device is also connected. In addition, the body cavity insertion part 2 is connected to the operating part main body 1 and is connected to a bendable long readable tube #9, and is connected to this flexible tube and can be displaced in any direction by a bending operation knob 4. It consists of a curved tube v10 and a distal end component 11 that is connected to the curved tube 10 and includes an illumination window, an observation window, a treatment instrument entrance, an air/water supply port (none of which are shown), and the like.

Inside the flexible tube 9 and the curved tube 10 of the body cavity insertion section 2, light transmission members such as image guide fibers and light guide fibers, treatment instrument insertion tubes, air/water supply tubes, curved tube manipulation wires, etc. operating members (none shown)
Various built-in members such as the above are inserted, and the respective tips of these built-in members are fixed within the tip forming portion 13.

In addition, as shown in FIG. 2, the curved pipe 10 is
5, and a curved piece 1 is connected in the length direction of the curved pipe 10.
4 are arranged in a row, and each curved piece 14 is connected to the operation section main body 1.
It is connected to the bending operation knob 4 by an operation wire (not shown). Further, the outer periphery of each curved piece 14 is coated with a metal blade 13 made of a band-like material such as gold) FA (not shown) and/or a fibrous material such as metal. 1-3
The curved part outer skin 1 which is the object of the present invention covers the outer periphery of the
It is 2.

Therefore, in the endoscope of this type, the bending tube 10 is required to not cause fatigue even when subjected to repeated expansion and contraction due to bending, and accordingly, the outer skin 12'ff has a small permanent elongation and a low modulus: Is it necessary to use it?

Conventionally, the outer skin 12 is made of ethylene propylene terpolymer (EPDM) rubber. The reason is that the rubber has a low stiffness, a low modulus, and a small permanent elongation, so there is no fear that it will be weakened.
It does not affect the human body and does not swell and deteriorate in response to mW. However, when EPDM rubber is immersed in vegetable oil such as olive oil, petrolatum, or glycerin for a long period of time, it swells or deteriorates when exposed to iodine-based disinfectant liquid, impairing its initial performance, which causes the rubber to harden. This reduces the tear strength and causes it to break due to the heel expansion and contraction caused by curving, or conversely, the rubber softens and becomes permanently stretched, causing wrinkles at the bent part, and as a result, the diameter of the bent part becomes thicker. There is a drawback that it causes pain to the patient when inserting the curved tube.

As the outer material, the physical properties of EPDM rubber are compared with the commonly used nitrile butadiene rubber (NBR) and the following
Contrast with table.

Table 1 The purpose of the present invention is to eliminate the various drawbacks of the conventional outer shell materials mentioned above, to have appropriate strength, flexibility, and physical properties with little permanent deformation, and to have excellent chemical resistance and oil resistance, and to meet hygienic requirements. It is an object of the present invention to provide a satisfactory curved outer skin for an endoscope.

According to the present invention, the curved portion outer cover for an endoscope is characterized in that it is made of a rubber blend of nitrile-butadiene copolymer rubber and ethylene ginseng propylene-dienter polymer rubber. The rubber blend according to the present invention has excellent unsoftened properties and strength, low permanent deformation, no elution of components, and extremely excellent chemical resistance, particularly isodine resistance. Here, the term "rubber blend" refers to a rubber blend of acrylonitrile and butadiene co-merged with ethylene and fluoropylene and diene p-pho9mer.

In general, the rubber blends according to the invention have strength, flexibility, 1
1.Is it a material with excellent chemical resistance, or is zinc oxide (
There is peace of mind in minimizing the amount of additives such as ZnO), and it is also necessary to ensure that the standards specified in Ministry of Health and Welfare Notification No. 301 are met.

Additionally, a small amount of amine-based, phenol-based, or dithiocarbamate-based anti-aging agents are usually added during the production of rubber blends, but it is preferable for hygiene reasons to keep this amount as low as possible. In addition, back element, calcium carbonate, magnesium carbonate,
Second, fillers such as silicone thread and clay, sulfur-based vulcanizing agents such as sulfur and polysulfide, and crosslinking agents such as organic peroxides and peroxides are also added. In addition, the rubber blend contains dioctyl phthalate, epoxidized soybean oil (AD KCi)
zer 0-130P, ADK C1zerO-
1308゜ADK C1zer O-180,h Product name, manufactured by Adeka Argus Chemical Co., Ltd.), Adipic acid polyester + (AI)K C4zerPN-400,P
N-650, B product name, manufactured by Adeka Argus Chemical Co., Ltd.), polyester plasticizer (Drapex 7.7,
It also contains "Plasti Oki" such as product name). In order to demonstrate its performance as an outer skin, the rubber blend has a rubber content of 100m4i.
It is preferable to contain 2 to 30 parts by weight of a plasticizer, 2 to 10 parts by weight of a crosslinking agent and/or vulcanizing agent, and 2 to 20 parts by weight of carbon black.

In the present invention, by combining the above-mentioned additives in the rubber blending process, we have succeeded in obtaining a skin with appropriate flexibility, a desired modulus, and no elution. did. That is, the present invention is based on the "Disposable Blood Transfusion Set and Infusion Set Standards" (1939).
We have succeeded in providing a curved outer skin that meets the standards set forth in Ministry of Health and Welfare Notification No. 301, August 10B, 2010). The curved part skin of the present invention has inferior properties as shown below compared to the skins used in the past.

1 The curved outer skin of the present invention has an appropriate balance of tensile strength and tear strength compared to conventional outer skins.

2. Since it has excellent heat property, unexpected changes in physical properties will not occur during long-term storage.

3. Has twisted resistance to Isodine.

4゜There is almost no water transportability.

5. Excellent oil resistance, especially low resistance to vegetable oils.

6. Tests to detect 'M*JF+, potassium permanganate reducing substances, evaporation residues, etc. did not detect these substances, and in terms of hygiene, there is an unexpected femininity.

Next, the Kinoi EA will be explained with reference to an embodiment.

Example 1 A rubber blend compound of nitrile butadiene common monomer rubber/ethylene propylene genter polymer rubber was prepared by beggar roll kneading according to the formulation shown in Table 2.

Table 2 (Ice lid part) Stearic acid 0.5 Carbon Black HA F 10 Epoxidized dog bean oil *110 Reconstituted calcium 10 Process oil *2 10 Beroximone F-40 *33.5 Parnok GM *41 *1: ADK C1zer 0-130P (product name), manufactured by Adeka Argus Chemical Company *2: Diana Process NM (product name), manufactured by Izumoto Petrochemical Corporation *3: 1.3-bis (tert-butylperoxy isopropylbenzene), Mffj 40*4: p-quinone dioxime roll mixture was pressed at 170°C for 20 minutes under mH pressure.
, shaped and then injection molded to JIS K-630
A sample 2 conforming to the test No. 1 and a tube-shaped curved portion outer skin 12 of the curved pipe 10 shown in FIG. 2 were formed.

This was heated in an oven at 150° C. for 30 minutes.

In FIG. 2, 13 is a metal blade, 14 is a curved top, and 15 is a top pin.

Example 2 A rubber blend formulation of nitrile butadiene co-plated rubber/ethylene e-propylene genter polymer rubber was prepared by roll milling according to the formulation shown in Table 3.

Table 3 (Parts by weight) Stearic acid 0.5 Carbon black HA F 10 Calcium carbonate
20 dioctyl phthalate
10 Diana Process NM
10 dicumyl peroxide
6 sulfur
0.30-L mixed material by pressing 1
Compression molding was performed at 70° C. for 20 minutes, and then the sample and the outer skin 12 were formed by injection molding in the same manner as in Example 1, and vulcanized in an oven at 150° C. for 30 minutes.

Individual physical property tests were conducted on the samples and shells obtained in Examples 1 and 2, and the results shown in Table 4 below were obtained.

Table 4 As is clear from the results in Table 4, the curved part outer skin of the present invention made of a rubber blend of nitrile butadiene copolymer rubber and ethylene/propylene Φ terpolymer rubber has flexibility, oil resistance, and thread resistance. It exhibits extremely excellent properties such as properties, and by using a peroxide crosslinking agent and/or a sulfur-based vulcanizing agent, almost no eluate is generated. Therefore, the skin of the present invention extends significantly through the endoscopic curved skin.

[Brief explanation of the drawing]

Fig. 1 is a 141] side view showing an example of an endoscope, and Fig. 2 shows a part of the curved part of the endoscope in the body cavity insertion part in the V↑ plane.
1 - Side view. 1... Φ operation part main body 2... body cavity insertion part 3... eyepiece part 4... quick-acting knob for bending 5 - treatment base inlet 6... air supply/water supply port γ-no. 7.0 suction button 8.φ.light guide cord

Claims (1)

[Scope of Claims] (1) A curved outer cover for an endoscope made of a blend rubber of nitrile-butadiene copolymer rubber and ethylene-propylene-genter polymer rubber. (2J The curved part outer cover for an endoscope according to claim 1, wherein the blended rubber contains a sulfur-based vulcanizing agent and a peroxide crosslinking agent alone or as a mixture. (3) The blended rubber has a rubber content of 100. 2 parts by weight
~30 Dendoja's dioctyl phthalate, epoxidized soybean oil, adipic acid polyester, and at least one plasticizer selected from polyester plasticizers, and 2 to 10 heavy lid parts'+11 as a vulcanizing agent. and a peroxide crosslinking agent, or both, and 2 to 2 parts of carbon black.