What prosthesis supports the arteries to keep them open?

Stents commonly used: A stent, currently stainless steel, over a balloon is expanded during the last angioplasty balloon inflation to help hold the plaque away from the opening. However, the stent is also a foreign object, generates a foreign body reaction & is very clot formation promoting. Thus anti-clotting agents & coating on stents to reduce tissue growth are used to decreased these. Better: tx disease drivers.