Medical Manipulator

A medical manipulator comprising:

• a handle;
• a shaft extending from the handle;
• a distal-end working unit having an end effector, the distal-end working unit being operatively coupled to the shaft for being tilted with respect to the shaft and rolled;
• and
• operating means disposed between the handle and the distal-end working unit, the operating means having a portion extending into the distal-end working unit for acting on the end effector;
• wherein the distal-end working unit has a rotor rotatable about a roll axis in unison with the end effector, the rotor having a hollow tube, and a rotational support tube having a posture variable with respect to an axial direction of the shaft, the rotor being rotatably supported by an inner circumferential surface of the rotational support tube;
• the rotor has a circumferentially extending annular groove defined in an outer circumferential surface thereof;
• the rotational support tube has at least one side hole extending through a wall thereof between inside and outside surfaces thereof, with an engaging member disposed in the side hole;
• and
• the engaging member is fixed to the rotational support tube while an inner end of the engaging member is inserted in the circumferentially extending annular groove.