Endoscope
An elevating base provided to be movable between an elevated position and a fallen position is provided at a distal end of an insertion part of the endoscope. As an elevating operation lever rotates in a first direction, the elevating operation lever causes the elevating base to move to the elevated position, and as the elevating operation lever rotates in a second direction, the elevating operation lever causes the elevating base to move to the fallen position. The elevating operation lever is coupled to a bearing member via a rotation ring. The rotation ring has a protrusion, and the bearing member has a plurality of holes and a rail to configure a locking mechanism.
1 . An endoscope comprising:
an insertion part to be inserted into a subject;
an operation part provided at a proximal end of the insertion part;
a distal end part main body that is positioned at a distal end of the insertion part and that communicates with a treatment tool lead-out port;
an elevating base that is provided on the distal end part main body and that causes a treatment tool led out from the treatment tool lead-out port to elevate, the elevating base being provided to be movable between an elevated position and a fallen position;
an elevating operation lever that rotates in a first direction to move the elevating base to the elevated position and that rotates in a second direction to move the elevating base to the fallen position;
a bearing member provided in the operation part;
a coupling member that couples the elevating operation lever and the bearing member; and
a locking mechanism that is provided between the bearing member and the coupling member and that includes:
a plurality of protrusions provided on one of the bearing member and the coupling member;
a plurality of holes provided on the other of the bearing member and the coupling member; and
a rail positioned between the plurality of holes adjacent to each other,
wherein in a case where at least one protrusion of the plurality of protrusions is fitted to at least one hole of the plurality of holes, the elevating operation lever is locked at a first position, and in a case where the elevating operation lever is rotated in the first direction or the second direction, the at least one protrusion of the plurality of protrusions passes through the rail, wherein the rail elastically deforms as the at least one protrusion of the plurality of protrusions moves to the at least one hole of the plurality of holes at a position different from the first position to lock the elevating operation lever at a second position.
2 . The endoscope according to claim 1 ,
wherein the plurality of holes and the plurality of protrusions are formed at a same pitch, and a number of the plurality of protrusions is smaller than a number of the plurality of holes.
3 . The endoscope according to claim 2 ,
wherein one of the bearing member and the coupling member has the plurality of protrusions formed along a first arc positioned around a center axis of the coupling member, and
the other of the bearing member and the coupling member has the holes formed along a second arc that is positioned around a center axis of a rotation shaft included in the bearing member, that has a radius equal to a radius of the first arc, and that has an arc length longer than an arc length of the first arc.
4 . The endoscope according to claim 3 ,
wherein inner diameters of the plurality of holes are formed to gradually decrease from an intermediate portion of the second arc toward both ends of the second arc.
5 . The endoscope according to claim 1 ,
wherein the insertion part includes a bendable part, and an angle knob that bends the bendable part is attached to the bearing member.
6 . The endoscope according to claim 1 ,
wherein at least one of the insertion part, the operation part, the distal end part main body, the elevating base, the elevating operation lever, the bearing member, the coupling member, and the locking mechanism is disposable.