| 主权项 |
1. An endoscope comprising:
an insertion portion which includes a distal end and a proximal end; an operation portion which is provided on a proximal end side of the insertion portion and includes an operating member and; a distal end portion body which is provided on a distal end side of the insertion portion, and has a front surface being a surface in a longitudinal direction of the insertion portion, an upper surface being a surface in a direction in which a treatment tool is led out with respect to the longitudinal direction and a lower surface being a surface on a side opposite to the upper surface with respect to the longitudinal direction; an elevator which is rotatably provided in the distal end portion body; a rotating shaft provided with an axis and configured to rotate the elevator around the axis, the rotating shaft including a first shaft portion and a second shaft portion connected with one end of the first shaft portion, wherein a cross section vertical to a direction of the axis of the rotating shaft in the first shaft portion has a non-circular shape, and a cross-sectional area of a cross section vertical to the direction of the axis in the second shaft portion is smaller than a cross-sectional area of the cross section of the first shaft portion; a rotating shaft receiving portion provided in the elevator, the rotating shaft receiving portion including a rotating shaft receiving region which is engaged with the first shaft portion in a relatively unrotatable manner and is loosely fitted to the second shaft portion in a relatively rotatable manner; an elevator erecting mechanism configured to rotate the rotating shaft; an operating wire which includes a proximal-end-side coupling portion coupled with the operating member and a distal-end-side coupling portion coupled with the elevator erecting mechanism, the operating wire being configured to rotate the rotating shaft to recline or erect the elevator when the operating wire is pushed or pulled by operation of the operating member; an elevator housing slit which is provided in the distal end portion body and forms a space portion to house the elevator, the elevator housing slit including an opening on a side of the upper surface, on a side of the lower surface and on a side of the front surface; and a cap which is detachably provided in the distal end portion body, the cap including an opening window which opens a part of the opening on the side of the upper surface, and a partition wall portion which closes a part of the opening portion on the side of the lower surface in a state in which the cap is attached to the distal end portion body, wherein: the distal end portion body includes a position restricting portion which is configured to restrict a relative position of the rotating shaft with respect to the rotating shaft receiving region of the rotating shaft receiving portion; and when the elevator is located in a first position in a rotation direction, the position restricting portion restricts the relative position of the rotating shaft with respect to the rotating shaft receiving region of the rotating shaft receiving portion to the first shaft portion, and, when the elevator is located in a second position in the rotation direction, the position restricting portion allows the relative position of the rotating shaft with respect to the rotating shaft receiving region of the rotating shaft receiving portion to move from the first shaft portion to the second shaft portion. |
