Surgical instrument

A surgical instrument configured to draw out an inserted suturing needle, comprising:

• an operating section configured to include an operating section body provided with an operating-section inner space, and an operating button disposed slidably in a button laid hole which is formed to communicate with the operating-section inner space provided in the operating section body;
• an insert section which is a pipe-like member provided with an insert-section distal end extension at a distal end of an insert section body:
• the insert section body being provided to extend from a distal end side of the operating section in a direction perpendicular to a central axis of the button laid hole, and having an inner bore along a first axis in a longitudinal direction, and
• the insert-section distal end extension having a rotation-allowing groove on an inner peripheral surface of an inner bore provided along a second axis oriented at a predetermined angle with respect to the first axis;
• a clamping portion comprising a first clamping member and a second clamping member, a proximal end flat surface of the second clamping member and a distal end flat surface of the first clamping member being movable to be selectively in contact with or apart from each other,
• the first clamping member including:
• the distal end flat surface provided on a distal end side thereof,
• a rotatable holder portion disposed rotatably in the rotation-allowing groove, and
• a bore along the second axis and a through hole communicating with the bore and outside the bore,
• the second clamping member including:
• a shaft portion disposed in the first clamping member so as to advance and retract in the through hole and the bore, and so as to rotate around the second axis,
• a flange portion provided with the proximal end flat surface which is positioned on a distal end side of the shaft portion and opposed to the distal end flat surface, and
• a receiving member fixed to a proximal end side of the shaft portion and having first contact surface formed to be inclined,
• a first biasing member disposed at the shaft portion of the second clamping member in the bore of the first clamping member and having a biasing force configured to expel the receiving member out of an opening of the bore and to bring the proximal end flat surface of the second clamping member into contact with the distal end flat surface of the first clamping member;
• a transmitting member which is a rod member having a distal end and a proximal end, and has at the a distal end, a second contact surface formed to be brought into surface contact with the first contact surface, a length of the transmitting member being set such that a gap is formed between the second contact surface and the first contact surface in a state where the operating button is not operated, and the transmitting member being disposed movably to advance and retract in the inner bore along the first axis of the insert section body,
• wherein, when the clamping portion is in a state grasping the suturing needle between the proximal end flat surface of the second clamping member and the distal end flat surface of the first clamping member by the biasing force of the first biasing member, a gap is formed between the second contact surface of the transmitting member disposed movably to advance and retract in the inner bore along the first axis of the insert section body and the first contact surface, to thereby allow the rotatable holder portion of the first clamping member of the clamping portion that grasps the suturing needle to be rotatable relative to the rotation-allowing groove formed on the inner peripheral surface of the inner bore along the second axis, and allow the clamping portion to passively rotate about the second axis, corresponding to an external force applied to the suturing needle.