Embodiments of the present disclosure are directed tostents, valved-stents, (e.g., single-stent-valves and doublestent/valved-stent systems) and associated methods and systems for theirdeliveryvia minimally-invasive surgery. The stent component comprises a firststent section (102) a second stent section (104) a third stent section(106) and a fourth stent section (108).