Abstract: An endoscope bending operation mechanism comprises an up-down bending operation knob (a left-right bending operation knob), an up-down bending pulley (a left-right bending pulley) supported for rotation by a pulley case, the up-down bending pulley is configured to move by an operation force from the up-down bending operation knob, an up-down bending operation wire (a left-right bending operation wire) having a proximal end and a distal end, the proximal end of which is connected to the up-down bending pulley (the left-right bending pulley) and the distal end of which is connected to a bending portion of an insertion section of an endoscope, a stopper member, a protruding portion, the stopper member and the protruding portion are movable relative to each other, an amount of relative rotation between the up-down bending pulley (the left-right bending pulley) and the pulley case is restricted by the protruding portion contacting the stopper member.

Abstract: A method of operating a connector unit of an endoscope system, the method including engaging a first engagement portion of a first connector with a second engagement portion of a second connector to electrically connect a first wire to a third wire via a second wire, electrically disconnecting the first wire and the second wire, and detaching the first engagement portion from the second engagement portion. The first connector includes the first wire electrically connected to the second wire. The second connector includes the third wire.

Abstract: A suction attachment includes a plug including a plug conduit, a first tube including a first conduit having a first end portion and a second end portion, a second tube having a second conduit including a third end portion and a fourth end portion, and a pressure regulator including a body with an interior cavity, a first opening, a second opening, and an actuator. The pressure regulator is connected to the fourth end portion and the interior cavity is in fluid communication with second conduit via the first opening in the body, and the second opening in the body connects the interior cavity to atmosphere. The actuator is movable between a first position and a second position, when the actuator is in the first position, the second opening is open and, when the actuator is in the second position, the second opening is closed.