PROBLEM TO BE SOLVED: To acquire sufficient propulsion force in the intraductal moving direction of an intraductal insertion section by efficiently converting the driving force of a rotary balloon to the propulsion force without locking a driving balloon to a duct inner wall.;SOLUTION: At least the initial diameter of first and second driving balloons 42, 46 is roughly fixed over the longitudinal direction (intraductal moving direction) of a luminal path and the first and second driving balloons 42, 46 have a roughly cylindrical shape with a fixed diameter excluding fixing parts at both ends. In the first and second driving balloons 42, 46, a range to be the roughly cylindrical shape (the initial diameter at least during contraction is fixed) is determined by a propulsion amount desired by one rotation of a locking balloon (rotary balloon), and the locking balloon is put over the entire side face part 800 of the cylindrical shape of the first or second driving balloon 42 or 46.;COPYRIGHT: (C)2011,JPO&INPIT
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