Fastening device, endoscope system, and suturing method

An endoscope system comprising:

• an endoscope;
• a shaft having a longitudinal axis along the endoscope;
• a staple unit attached to a distal end of the shaft and rotatable around the longitudinal axis;
• an operation unit provided at a proximal-end portion of the shaft;
• and
• a rotation restriction mechanism configured to restrict rotation of the staple unit around the longitudinal axis with respect to the endoscope due to an operation of the operation unit.

A suturing method of a tissue, which is a suturing method of a tissue using a fastening device including a shaft having a longitudinal axis, a fixing member configured to fix the shaft to an endoscope by being attached to the endoscope, a staple unit attached to a distal end of the shaft and rotatable around the longitudinal axis, an operation unit provided at a proximal-end portion of the shaft, and a rotation restriction mechanism configured to restrict rotation of the staple unit around the longitudinal axis with respect to the endoscope due to an operation of the operation unit, the suturing method of a tissue comprising:

• a step of inserting the staple unit and the endoscope, which are in a state in which the rotation thereof around the longitudinal axis is restricted, into a body;
• a step of grasping at least a part of the tissue with forceps;
• a step of pulling a part of the tissue relatively to a proximal end side of the endoscope and positioning a part of the tissue grasped by the forceps within a sutureable range of the fastening device;
• a step of releasing a state in which the rotation of the staple unit around the longitudinal axis is restricted;
• and
• a step of ejecting a staple and suturing the tissue using the staple unit.