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US 12,599,705 B2Granted
Flexible tube for endoscope, endoscopic medical device, method for producing covering material constituting flexible tube for endoscope, and method for producing flexible tube for endoscope
AssigneeFUJIFILM Corporation
InventorsYoshihiro Nakai, Kazushi Furukawa
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Abstract
Provided are a flexible tube for an endoscope, the flexible tube having a flexible-tube base that is flexible and tubular and a polyester elastomer layer that covers the flexible-tube base and has a naphthalene structure in a soft segment, an endoscopic medical device having the flexible tube for an endoscope, a method for producing a covering material constituting the flexible tube for an endoscope, and a method for producing the flexible tube for an endoscope.
Claims11
A flexible tube for an endoscope, comprising:
- a flexible-tube base that is flexible and tubular;
- and
- a polyester elastomer layer covering the flexible-tube base,
- wherein the polyester elastomer has a naphthalene structure in a soft segment,
- wherein a proportion of a naphthalenedicarboxylic acid component in the whole dicarboxylic acid component (100 mol %) constituting the soft segment is 20 to 100 mol %, and
- wherein the polyester elastomer has a hard segment, and a dicarboxylic acid component constituting the hard segment has a naphthalenedicarboxylic acid component and a phthalic acid component and when the hard segment has an isophthalic acid component as the phthalic acid component, a proportion of the isophthalic acid component in the whole dicarboxylic acid component (100 mol %) constituting the hard segment is 20 mol % or less.
3 more elements
Dependencies are inferred from the claim text.