Patent ID: 11864733
Assignee: OLYMPUS CORPORATION
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A

Claim 0:
1. A spiral tube for use on an outer peripheral portion of an insertion portion of an endoscope configured to be inserted into a subject, and rotatable around an insertion axis of the insertion portion by a driving force of a driving unit, the spiral tube comprising:
a first cylindrical member provided at one end;
a second cylindrical member provided at an other end;
a tube comprising:
an inner layer tube that has one end fixed to the second cylindrical member, and the inner layer tube is elongated along a longitudinal axis; and
an outer layer tube that has one end fixed to the first cylindrical member, the outer tube layer is elongated along the longitudinal axis, the outer tube layer covering an outer periphery of the inner tube layer and is slidable relative to the inner tube layer in a longitudinal direction; and

s sliding range restriction portion provided at an other end side of the outer layer tube, and configured to restrict movement of the outer layer tube relative to the inner layer tube to a predetermined range and to hold the inner layer tube in the outer layer tube, the sliding range restriction portion comprising:
the tube having a circumferential groove inwardly recessed in a radial direction relative to other portions of the tube; and
a ring member provided in the circumferential groove a portion of the outer layer tube corresponding to the circumferential groove.