Flexible tube and insertion apparatus
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United States of America Patent
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Mar 19, 2019
Grant Date -
Sep 14, 2017
app pub date -
May 26, 2017
filing date -
Dec 2, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A flexible tube used as a part of an insertion section which defines a central axis of an insertion apparatus to be inserted into a hole, the flexible tube includes: a helical tube comprising a closely-wound region including a concave-convex portion which is provided on each of a pair of edges of a strip-shaped member elongated along a longitudinal axis, and which alternately includes convex portions and concave portions on the concave-convex portion, wherein, in a state where the strip-shaped member is spirally wound, the convex portions of the concave-convex portions facing each other along the central axis are compressed to each other; and a cylindrical outer tube which covers an outer surface of the helical tube.
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