A retractor has a rigid piercing tube and an expansion body. The expansion body has an introduction tube which is received within the piercing tube, a movable wire which is received within the introduction tube, and stationary wires which are arranged around the movable wire. The proximal end of each of the stationary wires is affixed to the distal end of the introduction tube. The distal end of each of the stationary wires is joined to the distal end of the movable wire. The respective proximal ends of the piercing tube, the introduction tube, and the movable wire are respectively joined to first, second, and third grip sections.
1. A retractor for excluding an inside wall of a hollow organ or an organ in a body cavity, the retractor comprising:
a rigid perforation tube having a tip at a distal end;
a developing body that is configured to be accommodated and extended with respect to the distal end of the perforation tube; and
a grip connected to respective proximal ends of the perforation tube and the developing body, wherein the developing body includes:
an excluding section configured by a movable wire and a plurality of fixing wires arranged at a periphery of the movable wire, and
an introducing tube extended from the excluding section, the movable wire being passed through the introducing tube; wherein:
a distal end of the movable wire and distal ends of the fixing wires are joined in the excluding section, and
the grip includes, in order from a distal end of the grip, a first grip portion, a second grip portion, and a third grip portion, wherein the excluding section is caused to extend from the tip of the perforation tube by moving the second grip portion and the third grip portion toward the first grip portion in a state where the excluding section is closed and accommodated in the perforation tube, and the excluding section is capable of being developed, by moving the third grip portion toward the distal end of the grip without moving the second grip portion in a state where the excluding section is closed and extended from the tip of the perforation tube.
2. The retractor according to claim 1 , wherein the perforation tube is a straight tube.
3. The retractor according to claim 1 , wherein a cross-section of the movable wire has a substantially circular shape.
4. The retractor according to claim 3 , wherein a cross-section of each fixing wire has a partial circular ring shape in which a part of the cross-section substantially coincides with one part of an outer periphery of the cross-section of the movable wire.