Figure 7From: The in vivo performance of small-caliber nanofibrous polyurethane vascular grafts Internal surfaces of vascular grafts harvested 24 weeks after the surgery. (A) A PU graft showing a smooth and intact surface without thrombus or obvious neointimal hyperplasia. (B) A PTFE graft showing uneven surface and obvious neointimal hyperplasia (yellowish and stiffer).Back to article page