Catheter assembly with plaque cutting balloon

[Solution means] The balloon catheter assembly is equipped with the balloon in which at least 遠 of a proximal portion, the long and slender catheter axis in which at least 遠 has a portion, and an axis was fixed to the portion and which can be expanded. Two or more cutters are arranged along the surface outside the balloon. The cutter is covered by the pleat of the balloon when it is in the state where the balloon has not swollen, and it 配設 and it is constituted so that it may be easy to destroy the restriction thing of a blood vessel and may become, when it is in the state in which the above-mentioned balloon swelled. As for a cutter, it is desirable for the sequence of at least three in general parallel directions of Nagate to 配設, and for there to be a cutter which aligned in at least three directions of Nagate in each sequence outside a balloon along the surface. As for a cutter, it is desirable for it to be formed with the base material composite the same as a balloon or same, and to be combined with the surface outside a balloon. [Selection figure] Fig. 1