Patent ID: 7972345

Claim:
A surgical instrument comprising: an insertion unit; an operating unit provided on one end of the insertion unit; a treatment unit provided so as to protrude from the other end of the insertion unit; a first shaft member for transmitting turning force to the treatment unit in conjunction with the turning operation of a turning operation member provided on the operating unit; a second shaft member for transmitting opening/closing force to the treatment unit in conjunction with the opening/closing operation of an opening/closing member provided on the operating unit; and a third shaft member for transmitting angle-variable force which changes the angle in the protruding direction of the treatment unit as to the axis of the insertion unit in conjunction with an angle-variable operation of a angle-variable operating unit provided on the operating unit; wherein the first shaft member, the second shaft member, and the third shaft member are positioned on approximately the same axis, the first shaft member, second shaft member and third shaft member extend from a distal end of the insertion unit to the operating unit; and wherein the treatment unit can turn about the axis in the protruding direction according to the turning operation with the turning operation member, and the treatment unit can move at least one of two gripping members, each having a gripping face according to the opening/closing operation with the opening/closing operation member, and so can be opened or closed, and the treatment unit can change the angle in the protruding direction according to the angle-variable operation with the angle-variable operating unit and wherein the first and third shaft members are each in a pipe shape, and the second shaft member is in a rod shape, wherein the second shaft member is inserted within the first shaft member, and the first shaft member is inserted within the third shaft member.