Patent ID: 7794470

Claim:
A surgical instrument comprising: an insertion unit; a treatment unit provided at one end of the insertion unit, capable of turning about a first turn axis which is perpendicular to a long axis of the insertion unit, and comprising a clamping section capable of an opening and closing action; an operation unit, which can be operated with a single finger and its long axis is the same as the long axis of the insertion unit, provided at the other end of the insertion unit; a turn force transmission mechanism, provided between the operation unit and the treatment unit along the insertion unit, and transmitting a turn force as a force to turn the treatment unit from the operation unit to the treatment unit; an opening and closing force transmission mechanism, provided between the operation unit and the treatment unit along the insertion unit, and transmitting an opening and closing force as a force to open and close the clamping section from the operation unit to the treatment unit; and a common operation mechanism, provided in the operation unit, which can generate the turn force transmitted by the turn force transmission mechanism and which can also generate the opening and closing force transmitted by the opening and closing transmission mechanism, wherein the common operation mechanism comprises a disk-shaped operation dial which is capable of turning about a second turn axis which is parallel to the first turn axis of the treatment unit; the turn force is generated by the turn operation of the operation dial, and the opening and closing force is generated by another operation different from the turn operation of the operation dial; and the other operation is an operation based on application of a pressing force to the operation dial in the direction perpendicular to the turn axis of the operation dial and on release of the application.