| 摘要 |
The object is to seek a position for an insertion opening through which a treatment tool inserted inside a body cavity may reach an affected area while avoiding an obstacle. A first light emitting portion placed in an insertion portion applies light to an affected area inside a body cavity. A second light emitting portion placed in the insertion portion applies light to an inner wall of the body cavity toward the opposite side of the first light emitting portion. At this time, a light pathway on which the light from the first light emitting portion and the second light emitting portion will not strike the obstacle (e.g., an organ outside than the affected area, etc.) inside the body cavity is searched for. By making, in the position that the light from the second light emitting portion strikes, an insertion opening for inserting a treatment tool, the treatment tool can reach the affected area without interfering with the obstacle.
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