A PTCA (Percutaneous Transluminal Coronary Angioplasty) balloon catheter is a medical device used in interventional cardiology to treat narrowed or blocked coronary arteries. It consists of a thin, flexible tube with an inflatable balloon at its tip. During the procedure, the catheter is guided through blood vessels to the blocked artery, where the balloon is inflated to compress plaque against the artery walls, widening the lumen and restoring blood flow to the heart. It is often used in conjunction with stents to maintain artery patency post-treatment.