Sheath of articulated tube for endoscope

• US 5,110,645 A
• Filed: 09/02/1991
• Issued: 05/05/1992
• Est. Priority Date: 10/03/1986
• Status: Expired due to Term

• Current Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Original Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Inventors: Matsumoto, Jun, Tanaka, Ryouchi
• Primary Examiner(s): Seidleck, James J.
• Application Number:
  US07/764,043
• Time in Patent Office: 246 Days
• Field of Search: 428/36.9, 524/520, 264/331.13, 264/331.14, 264/347, 264/236
• US Class Current: 428/36.9
• CPC Class Codes: A61B 1/0055 Constructional details of insertion parts, e.g. vertebral elements
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 27/16 Homopolymers or copolymers or vinylidene fluoride
• CPC Class Codes: Y10T 428/139 Open-ended, self-supporting conduit, cylinder, or tube-type article

Abstract

A sheath of an articulated tube for an endoscope is formed of material produced by adding polymer of fluorine-contained rubber material of triple copolymer of vinylidene fluoride-hexafluoropropylene-tetrafloroethylene as a main component, heat-proof plasticizer of binary copolymer of vinylidene fluoride-hexafluoropropyelne for reducing hardness, MT carbon filler, Perhexa 25B of peroxide vulcanizing agent and triallyl isocyanurate (TAIC) as peroxide vulcanizing assistant, resulting in reduced hardness, good operability while bending, good drug-, heat-, and sterilization-proof and long durability.

Claims

1. A sheath of an articulated tube for use in an endoscope, comprising:

a terpolymer of vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene as a main component;

a copolymer of vinylidene fluoride-hexafluoropropylene as a heat-proof plasticizer;

medium thermal furnace black as a filler; and

a peroxide vulcanizing agent and a peroxide vulcanizing assistant.

2. A sheath according to claim 1, which comprises 100 parts of the terpolymer of vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene, 5 through 20 parts of the copolymer of vinylidene fluoride-hexafluoropropylene, 5 through 20 parts of medium thermal furnace black, 0.1 through 1 part of 2,5-dimethyl-2,5-di(t-butylperoxy)hexane and 0.1 through 2 parts of triallyl isocyanurate.

3. A sheath according to claim 2 in which the amount of copolymer is 10 parts, the amount of medium thermal furnace black is 10 parts, the amount of peroxide is 0.5 part and the amount of triallyl isocyanurate is 1.5 parts.

4. A method of making a sheath of an articulated tube for use in an endoscope which comprises mixing and dispersing a terpolymer of vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene as a main component, a copolymer of vinylidene fluoride-hexafluoropropylene as a heat-proof plasticizer, medium thermal furnace black as a filler, a peroxide vulcanizing agent and a peroxide vulcanizing assistant with a two roll mill, molding the mixed and dispersed composition by applying compression with a hot press at a temperature of 160°

C. for 10 minutes and subjecting the molded mixture to secondary vulcanization by hot blast at a temperature of 180°

C. for four hours.

5. The method of claim 4 in which the materials mixed contain per 100 parts of the terpolymer, 5-20 parts of the copolymer, 5-20 parts of the medium thermal furnace black, 0.1-1 part of 2,5-dimethyl-2,5-di(t-butylperoxy) hexane and 0.1-2 parts of triallyl isocyanurate.

6. The method of claim 5 in which the amount of copolymer is 10 parts, the amount of medium thermal furnace black is 10 parts, the amount of peroxide is 0.5 part and the amount of triallyl isocyanurate is 1.5 parts.