&Balloon catheter is a kind of interventional medical device, which is disposable. It is simply used to dilate the blood vessels in the blocked area, so that the smaller diameter can be restored to the normal vascular diameter or a little smaller than the normal one, but it will be better than that before operation. Each patient's condition is different. If it is judged that some people can't achieve the purpose of expanding the vascular diameter by balloon catheter, they will choose stents to expand the vascular diameter of lesions through metal.