Surgical instrument

A surgical instrument, comprising:

• an insertion part which is configured to be capable of inserting into a body;
• a base disposed at a distal end portion of the insertion part and having a bottom part provided to be extended in a longitudinal axis direction;
• a first grasping surface supported by the base and provided to be extended in a longitudinal axis;
• a second grasping surface provided to be faced to the first grasping surface and configured to grasp a tissue between the first grasping surface and the second grasping surface by approaching to the first grasping surface;
• a plurality of staple which is disposed between the base and the first grasping surface and which is capable of ejecting from the first grasping surface to the second grasping surface;
• a first staple line consists of the plurality of staple arranged along the longitudinal axis;
• a second staple line consists of the plurality of staple arranged along the longitudinal axis and elongated parallel to the first staple line;
• a groove part positioned between the first staple line and the second staple line in a cross direction crossing to the longitudinal axis and elongated along the longitudinal axis, the groove part consists of first wall surface, second wall surface, and the bottom part, the first wall surface provided to be extended from the first grasping surface to the bottom part, the second wall surface faced to the first wall surface at a position apart from the first wall surface in the cross direction;
• a traction member attached to the first grasping surface and is capable of coupling with the tissue by being penetrated by the plurality of staple;
• a locked part which is a part of the traction member provided inside the groove part and having first locked part and second locked part, the first locked part elongated along the first wall surface from the first grasping surface to the bottom part, the second locked part elongated along the second wall surface from the first grasping surface to the bottom part at a position apart from the first locked part in the cross direction;
• and
• a blade part accommodated in the groove part so as to be capable of advancing and retracting along the longitudinal axis, the groove part in which the first locked part and the second locked part are provided, the blade part configured to be capable of dissecting the tissue by advancing ant retracting along the longitudinal axis between the first locked part and the second locked part in the cross direction,
• wherein the first wall surface and the second wall surface are provided to be apart from each other in the cross direction such that when the blade part is positioned between the first locked part and the second locked part in the cross direction, gaps both between the blade part and the first locked part and between the blade part and the second locked part are capable of being formed.