| 主权项 |
1. An inserting device comprising:
an inserting section which is extended along a longitudinal axis; a motion section which is provided in the inserting section or attached to the inserting section, and which is configured to be driven when a driving force is transmitted thereto; a shape-variable tube which has a tube axis extended from a first extending direction toward a second extending direction that is a direction opposite to the first extending direction, and which has a flexibility, the shape-variable tube being configured to elastically return in a case where the shape-variable tube bends at a tube bending radius of a tube radius boundary value or more; and a shaft which has a shaft axis extended inside the shape-variable tube from the first extending direction toward the second extending direction, the shaft being configured to rotate around the shaft axis by an action of a rotational torque so that the shaft transmits the driving force to drive the motion section from the first extending direction toward the second extending direction, the shaft being configured to elastically return in a case where the shaft bends at a shaft bending radius of a shaft radius boundary value or more, the shaft being configured to rotate without being deformed in a state where the elastic return is impossible when the shape-variable tube bends in an elastically returnable range, wherein the shape-variable tube includes a tube inner peripheral surface which is configured to exert a pressing force on the shaft toward the tube axis so that the tube inner peripheral surface maintains the shaft bending radius of the shaft at a size of the shaft radius boundary value or more, in a state where the shaft that is spirally extended rotates by the action of the rotational torque on the shaft. |
