An expandable sleeved stent 10 comprises (i) a tubular stent body 12 with first and second axial ends, a latticed peripheral wall 16, and at least two arms 18 that, upon radial expansion of the tubular body from a crimped condition to an expanded condition, protrude radially from the latticed peripheral wall with the free end of each arm radially displaced outwards, and (ii) a sleeve 14 which circumferentially covers at least a portion of the outer surface of the latticed peripheral wall between the free ends of the arms and the first axial end of the tubular body and bridges the spaces between the portions of the latticed peripheral wall adjacent the arms and the free ends of the arms. In a first embodiment the sleeve is secured to either the arms or the tubular body between the free ends of the arms and the second axial end of the tubular body such that upon radial expansion the portion of the sleeve that bridges the latticed peripheral wall and the arms flares radially outwards. In a second embodiment the sleeve covers the arms and has radially outwardly extending humps 26 which provide pockets 32 between the sleeve and arms； such that upon radial expansion the arms extend into the pockets. The sleeve of this embodiment may be formed by stretching over a cylindrical mandrel (28, Fig 6) with humps, before being placed over the stent.
