An expandable stent-valve (1), having a stent component (2) and a valve component (3), preferably an aortic valve component, a mitral valve component or a tricuspid valve component, wherein the stent component (2) comprises an outer surface (10, 11, 23) area structured in a manner such that the surface (10, 11, 23) area has a higher coefficient of friction between the outer surface (10, 11, 23) and a duct wall than an untreated surface area of the stent component (2), said surface area preferably being structured with micro-incisions (12) or micro-grooves.
