Figure 6. . Stent coating structures and positioning in the coronary artery.

Top: porous structure of various ceramic coatings and chemical structures of polymers that have been applied on stents; (A) plaque accumulation in the lumen of coronary artery and delivery of nonexpanded stent; (B) expanded stent via pressure of balloon catheter; (C) expanded stent remains at the site of plaque allowing good blood flow.

CNT: Carbon nanotube; HAp: Hydroxyapatite; MMSN: Magnetic mesoporous silica nanoparticle.