Device for treating vascular stenosis

The utility model relates to a device for treating vascular stenosis. In order to solve the problems of poor balloon dilatation effect or excessive dilatation or extrusion deformation of a narrow part, stimulation of a drug-coated stent to a blood vessel wall, incapability of fully applying drug to a focus part and the like in the prior art, the utility model provides a high-reliability vascular stenosis treatment device which comprises a treatment assembly, the treatment assembly comprises a balloon and a wrapping part wrapping the outer portion of the balloon, the balloon has an unexpanded state and an expanded state, the wrapping part expands along with expansion of the balloon, a plurality of through holes are formed in the wrapping part, and when the balloon is in the expanded state, the hole diameter of the through holes is larger than that of the through holes when the balloon is in the unexpanded state. The balloon and/or the coating piece are/is coated with a medicine for treatment purpose; when the