Instrument for electrocautery surgery

A surgical instrument comprising:

• an end tool including a first jaw and a second jaw, each configured to be rotatable, the end tool being configured to be rotatable in two or more directions;
• a manipulation part configured to control the rotation of the end tool in the two or more directions;
• a power transmission part including a first jaw wire connected to the manipulation part and configured to transmit a rotation of the manipulation part to the first jaw, and a second jaw wire connected to the manipulation part and configured to transmit the rotation of the manipulation part to the second jaw;
• and
• a connection part configured to extend in a first direction (X-axis) and having one end portion to which the end tool is coupled and another end portion to which the manipulation part is coupled, thereby connecting the manipulation part to the end tool,
• wherein the end tool further includes:
• a first jaw pulley coupled to the first jaw and configured to be rotatable around a first rotation shaft;
• a second jaw pulley coupled to the second jaw and configured to be rotatable around a shaft that is substantially identical to or parallel to the first rotation shaft;
• and
• a blade assembly including a blade that moves between a proximal end and a distal end of the end tool, and positioned adjacent to the first jaw pulley or the second jaw pulley,
• the power transmission part further includes a blade wire, at least a portion of which is in contact with the blade assembly, to transmit, to the blade, a driving force required to move the blade,
• the manipulation part includes a cutting-manipulation portion including a cutting lever configured to rotate around a rotation shaft, and
• opposite end portions of the blade wire are respectively connected to the cutting-manipulation portion and the blade, such that a rotational motion of the cutting-manipulation portion is converted into a linear motion of the blade through the blade wire.