US Patent 9968343 Minimally invasive surgical instrument having a bent shaft

The present invention relates to a minimally invasive surgical instrument having a bent shaft, and more particularly to a minimally invasive surgical instrument in which at least a part of a shaft includes a bend. According to one aspect of the invention, there is provided a minimally invasive surgical instrument comprising: a shaft; an end effector connected to one end of the shaft; a joint unit interposed between the shaft and the end effector; and a plurality of wires connected to the joint unit to enable the end effector to carry out joint motion, wherein the shaft comprises at least one bend, and the at least one bend may transmit therein force to operate the end effector in a roll direction, independently of the shaft.