Comparison of a Microporous Thermoplastic Polyurethane-covered Stent with a Self-expanding Bare Nitinol Stent in a Porcine Iliac Artery Model

TPU grafts failed to provide improved patency compared with the bare nitinol stents because of excessive neointimal growth and subsequent occlusion. In addition, the bare nitinol stents showed considerable in-stent stenosis at angiography and microscopy.