Patent ID: 8246534
Filing Date: 2012-08-21
Classification: A61B,A61M,G02B

Abstract:
1. An endoscope comprising: an insertion unit that is inserted into a body cavity; an observation optical system that is provided with an observation window formed at a distal end portion of the insertion unit and has a central axis of a field of view in a predetermined direction; a treatment instrument insertion channel that is provided in the insertion unit and is open to the distal end portion of the insertion unit; and a treatment instrument raising stand that is capable of guiding a guide wire, which is inserted from a proximal end side of the treatment instrument insertion channel and led out into the body cavity from the distal end portion of the insertion unit in a substantially vertical direction of an endoscopic image taken by the observation optical system, wherein: when the guide wire is maximally raised on the treatment instrument raising stand and a distal end of the guide wire is positioned at a position apart from the observation window by about 20 mm, a tilt angle of the central axis of the field of view of the observation window and a tilt angle of the guide wire at when the treatment instrument raising stand is maximally raised are set so as to position the distal end of the guide wire near a central line, which divides a screen of the endoscopic image equally in the vertical direction, or positioned at an area above the central line, and when the guide wire is maximally raised on the treatment instrument raising stand and the distal end of the guide wire is positioned at the position apart from the observation window by about 20 mm, the distal end of the guide wire is positioned near the central line or positioned at the area above the central line, by positioning the guide wire to have a tilt angle equal to or smaller than the tilt angle of the central axis of the field of view of the observation window.