Figure 5
Intima hyperplasia of stents under scanning electronic microscopy was shown. (A, B) Twenty days after stenting, only some collagenous fibers and red blood cells were shown on the self-expandable covered stent (A) and self-expandable bare stent (B), with no endothelial cells. (C, D) Forty days later, more collagenous fibers and red blood cells were presented on the internal surface of the self-expandable bare stent (C) and self-expandable covered stent (D), with a few stripe-like endothelial cells (arrows in figure C). (E–H) Three months after stenting, fusiform, round and stripe-like endothelial cells were presented at the internal surface of the balloon-expandable covered (E), self-expandable covered (F), and self-expandable bare (G, H) stent. (I-L) At the 4th month, stripe-like and fusiform endothelial cells were presented on the balloon-expandable covered (I), self-expandable covered (J), and bare (K, L) stent. The endothelial cells were fusiform at depressed areas (double arrows in figure D) but round at protruding areas (star in Figure L).
