Patent ID: 8643709
Filing Date: 2014-02-04
Classification: A61B

Abstract:
1. An endoscope comprising: a distal end forming portion forming a distal end portion of the endoscope and extending in an axial direction; an image pick-up unit extending in the axial direction within the distal end forming portion; and a channel tube extending in the axial direction within the distal end forming portion and including a parallel portion arranged parallel with the image pick-up unit, and wherein: the parallel portion includes a circular inner peripheral surface and a noncircular outer peripheral surface, and the noncircular outer peripheral surface includes, in a cross section thereof, orthogonal to the axial direction: a diameter keeping portion arranged on a side other than the side facing the image pick-up unit and whose at least a part overlaps the imaginary reference circumferential surface; wherein the noncircular outer peripheral surface includes an opposite side diameter reducing portion in the cross section orthogonal to the axial direction which is arranged opposite to the facing side diameter reducing portion with respect to the central axis and which is closer to the central axis side than the imaginary reference circumferential surface.