Invasive sector of Cardiology ward in Hospital "Trakia" is one of the first in the country applying the treatment of coronary narrowing with the most advanced polymeric stents. Their main advantage is that after three years stents completely absorbed and disappear. Passability of the treated artery not only is maintained after the "melting" of the wall, but education and even increases, because the lack of stent allows the artery to continue to grow, explained Dr. Borisov. The new type stents are made of specific polymer - polylactate. Placed in the artery after 3 years, the polymer is degraded to lactic acid, and is absorbed by the body of the patient. Conventional stents are metal, most often are made of chromium-cobalt, platinum-chromium. They remain in the body forever, which in some ways brings negatives. "The best that can happen to a stent is it to do its job and then disappear," said Dr. Borisov.