A little balloon at the end of the catheter is inflated to open the narrowed artery. A metal stent is inserted to prevent the artery from narrowing once again.   There is a problem with data submitted for this request. Review/update the data highlighted beneath and resubmit the shape. From https://www.sgvascularctr.com/revealing-the-latest-innovations-in-carotid-artery-disease-treatment/