Pressing member, endoscopic treatment system, and endoscopic suturing device

A pressing member, comprising:

• a pressing member main body which has a chamber that has a cylindrical shape elongated from a proximal end to a distal end thereof, the pressing member main body being disposed between a treatment target portion of a biological tissue and an endoscope inserted into a body of a patient for treatment of the treatment target portion of the biological tissue, the pressing member main body including a lateral hole provided at side surface of the chamber;
• a slider which is provided at an inner surface of the chamber, the slider being configured to move along the side surface of the pressing member main body in a direction crossing the lateral hole where an end portion of the slider approaches or departs from a peripheral border portion of the lateral hole so as to adjust a clearance between the peripheral border portion of the lateral hole and the end portion of the slider;
• rails in which the slider is configured to slide and which are at the inner surface of the chamber, the rails being configured to guide the slider to move along the side surface of the pressing member main body in a peripheral direction of the lateral hole;
• and
• wires provided at the inner surface of the chamber and connected to the slider, the wires configured to operate movements of the slider in the peripheral direction by being pulled in a direction from the distal end to the proximal end;
• wherein
• the end portion of the slider and the peripheral border portion are capable of pressing the treatment target portion that is drawn into the pressing member main body.