Roll joint member for surgical instrument

A roll joint device for a surgical instrument, the roll joint device comprising:

• a shaft member having a shaft to which at least one roll wire is coupled and rotatable around a roll axis according to a movement of the at least one roll wire;
• and
• a guide member having one side to which the shaft member rotatable around the roll axis is coupled,
• wherein the guide member comprises:
• at least one wire hole through which the at least one roll wire passes,
• a wire guide portion formed to contact at least a part of the at least one roll wire to guide an entry path of the at least one roll wire into the at least one wire hole such that an entry direction of the at least one roll wire into the at least one wire hole and an exit direction of the at least one roll wire from the at least one wire hole are substantially in parallel with an extension direction of the shaft, and
• a wire support portion supporting at least a part of the at least one roll wire wound around the shaft member,
• wherein the shaft member and the guide member are formed as separate members and coupled to each other,
• wherein the shaft member is configured to rotate with respect to the guide member while the guide member is fixed, and
• wherein, when viewed on a plane perpendicular to the roll axis, the wire guide portion and the wire support portion are asymmetrically formed to have different shapes from each other.