Patent ID: 11944266
Assignee: OLYMPUS CORPORATION
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A

Claim 0:
1. An endoscope comprising:
an insertion section extending in a longitudinal direction;
a distal end holding member provided inside the insertion section;
a proximal end member having a proximal end holding portion, the proximal end member being provided proximally relative to the distal end holding member;
an outer cylinder including a distal end portion held by the distal end holding member and a proximal end portion held by the proximal end holding member; and
an inner cylinder provided inside the outer cylinder;
a treatment instrument raising base provided on a distal end side of the insertion section and configured to change an orientation of a distal end side of a treatment instrument inserted in the insertion section;
a wire inserted into the inner cylinder and coupled to the treatment instrument raising base, the wire is configured to be advanced or retracted by an external operation to raise or lower the treatment instrument raising base; and
wherein a gap is formed between a proximal end face of the inner cylinder and a corresponding surface of the proximal end member in the longitudinal direction at least when the inner and outer cylinders are bent together relative to the longitudinal direction; and
a first difference between an inner diameter of the inner cylinder and the inner diameter of an inner circumferential wall of the proximal end member is larger than a second difference between an inner diameter of the outer cylinder and an outer diameter of the inner cylinder.