A balloon catheter is a medical device used to treat various conditions in the body, particularly in the cardiovascular system. It consists of a thin tube with a small balloon at its tip. Doctors insert the catheter into a blood vessel and guide it to the area that needs treatment. Once in place, the balloon is inflated to open up narrowed or blocked arteries, improving blood flow. This procedure is often performed during a technique called angioplasty, which helps patients with conditions like coronary artery disease. By restoring proper blood flow, balloon catheters can relieve symptoms and reduce the risk of serious complications, making them an essential tool in modern medicine.