Patent ID: 11867897
Assignee: EVIDENT CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. An insertion assisting instrument which has an outer peripheral surface including a proximal-end-side tapered surface with a diameter decreasing from a distal end side toward a proximal end side and a distal-end-side tapered surface with a diameter decreasing from a proximal end side toward a distal end side, the distal-end-side tapered surface being continuously provided on the distal end side of the proximal-end-side tapered surface, a distal end portion of an insertion portion of an endoscope being inserted through and fixed to the insertion assisting instrument, wherein
assuming that the insertion assisting instrument is projected on X-Y coordinates such that a point on a circumference where the insertion assisting instrument has a largest outer diameter is set as an origin and the proximal-end-side tapered surface is brought into contact with an X axis, coordinates of a point which is most distal from the X axis on a circumference at a distal end of the insertion assisting instrument are (xa′, ya′), and coordinates of a point which is most distal from the X axis on the circumference where the insertion assisting instrument has the largest outer diameter are (xb′, yb′), the insertion assisting instrument has an outer dimension that satisfies a relationship of ya′<yb′.