Abstract: There is provided an endoscopic treatment system. The system includes an endoscope having an insertion portion which is inserted into a body and has a forceps insertion duct, and a light emitting member which has an end portion that emits the light and is inserted into a hollow organ in the body through the forceps insertion duct of the endoscope. The light emitting member issues positional information of the hollow organ which is detected through the endoscope orally and gastrically inserted into an abdominal cavity by causing the end portion to emit the light in the hollow organ. The system includes a treatment instrument by which a treatment is conducted in the abdominal cavity in cooperation with the endoscope.

Abstract: There is provided a flexible guide tube which guides an endoscope or a therapeutic device into an abdominal cavity through the mouth and stomach to conduct an observation or a therapeutic treatment in the abdominal cavity. The guide tube includes an insertion section which has a distal end, a peripheral section, and a central axis, and which is capable of being inserted into a body through the mouth, and two expandable and shrinkable balloons arranged in the vicinity of the distal end at a predetermined distance from each other in the axial direction on the periphery of the insertion section. The predetermined distance is preferably set to 3 to 8 mm, and the length of the insertion section is preferably set to about 600 to 1000 mm.