Angioplasty is a minimally-invasive surgical procedure used to expand the size of blocked or narrowed veins, usually to treat cardiovascular varicose veins (veins that narrow in the body's blood vessels). This procedure involves the use of a balloon catheter inserted into a vein, which is inflated to create an erection. The resulting angioplasty balloons create a "balloon" effect that forces the blood through the narrowed vein, which enlarges it.