Precise-positioning staged balloon dilatation vertebral artery stent system and method

The invention relates to an accurate-positioning staged balloon dilatation vertebral artery stent system and method, and belongs to the technical field of balloon stent positioning of vertebral artery operations. The special-shaped balloon is arranged, on one hand, physical limiting and positioning are achieved through the size and structure difference design of the near-end balloon and the far-end balloon, and it can be ensured that the special-shaped balloon can accurately reach the designated position of the joint of the narrow part and the subclavian artery in the stretching-in process, and automatic calibration is conducted; the amplitude influence on the special-shaped balloon and the stent when the catheter is withdrawn can be effectively avoided; on the other hand, the successive deformation process of the near-end balloon and the far-end balloon is achieved by controlling the speed and the size of the propelling air pressure so as to ensure that the stent is fixed after sufficient positioning, in add