Patent ID: 8100825
Filing Date: 2012-01-24
Classification: A61B

Abstract:
1. An endoscope comprising: an insertion portion which has a bendable portion; an operation portion from which the insertion portion extends; a first bending operation knob which is arranged directly on a surface of the operation portion, includes plural first protrusions, and is rotatable to bend the bendable portion in a first direction; and a second bending operation knob which is arranged directly over the first bending operation knob, includes plural second protrusions, and is rotatable to bend the bendable portion in a second direction, such that the first bending operation knob is positioned between the surface of the operation portion and the second bending operation knob, the first bending operation knob sharing an axis of rotation with the second bending operation knob, wherein a length each of the plural second protrusions from a center of rotation to a tip portion of each of the plural second protrusions is longer than a length of one of the plural first protrusions from the center of rotation to a tip portion of each of the plural first protrusions, and at least one of the plural second protrusions has a depression formed in the second protrusion of the second bending operation knob on a surface facing the first protrusion of the first bending operation knob arranged directly on the surface of the operation portion.