Patent ID: 9220397
Filing Date: 2015-12-29
Classification: A61B

Abstract:
1. An endoscope comprising: an insertion part which is inserted into a body cavity, the insertion part having: wherein a center O of the flat distal end surface lies on the longitudinal axis of the insertion part, wherein a distance between the center O of the flat distal end surface and the outer peripheral edge is assumed as r, wherein the observation window is located in a vicinity of the outer peripheral edge and a central position of the observation window is located on an outer side of a distance position of 0.5×r from the center O of the flat distal end surface, and wherein in a vicinity of the observation window which is a region sandwiched by two tangents drawn from the center O of the flat distal end surface to the observation window, the chamfered surface is round-chamfered in a manner that as a distance between a central axis of the observation window and a point of a plurality of points along the outer circumferential surface increases, a radius of round-chamfer of the chamfered surface increases.