pharmacologically active , easy - to - deploy , biomechanically compatible , inflatable endovascular , drug - eluting stent are formed of a primary expandable polymeric or metallic construct , intimately mantled with a biomechanically compatible , polymeric microporous , microfibrous , compliant , stretchable fabric formed by direct electrospinning onto the outside surface of the primary construct using at least one polymer solution containing at least one active compound , selected from those expected to control key biological events leading to in - stent restenosis .