A delivery device for delivering a stent device to a target treatment site, comprising: a self-expanding stent device having a longitudinal axis, a lumen extending axially through the stent device, an inner surface defining the lumen and an outer surface, wherein the stent device is in a radially reduced profile, delivery configuration and is expandable to a radially increased profile, deployed configuration; an inner member extending axially through the lumen of the stent device; an outer sheath holding the stent device in the delivery configuration and axially retractable to release the stent device to expand to the deployed configuration; and anchorage configured to hold the stent device axially to the inner member as the outer sheath is dragged over an outer surface of the stent device; wherein the anchorage includes at least one protuberance extending radially from the inner member and engaging the inner surface of the stent device at the distal portion, such that a distal axial portion of the stent device is held to the inner member to a greater extent than the remaining axial length of the stent device; the anchorage further including a stop for limiting axial movement of the stent device during release of the stent from the delivery device by abutting against a proximal end surface of the stent device, the stop being spaced prior to said release a predetermined axial distance from the surface so that the portion of the stent device proximal of the said at least one protuberance is able to move the predetermined distance with the outer sheath during retraction of the outer sheath, for the release of the stent device from the delivery device. a self-expanding stent device having a longitudinal axis, a lumen extending axially through the stent device, an inner surface defining the lumen and an outer surface, wherein the stent device is in a radially reduced profile, delivery configuration and is expandable to a radially increased profile, deployed configuration; an inner member extending axially through the lumen of the stent device; an outer sheath holding the stent device in the delivery configuration and axially retractable to release the stent device to expand to the deployed configuration; and anchorage configured to hold the stent device axially to the inner member as the outer sheath is dragged over an outer surface of the stent device; wherein the anchorage includes at least one protuberance extending radially from the inner member and engaging the inner surface of the stent device at the distal portion, such that a distal axial portion of the stent device is held to the inner member to a greater extent than the remaining axial length of the stent device; the anchorage further including a stop for limiting axial movement of the stent device during release of the stent from the delivery device by abutting against a proximal end surface of the stent device, the stop being spaced prior to said release a predetermined axial distance from the surface so that the portion of the stent device proximal of the said at least one protuberance is able to move the predetermined distance with the outer sheath during retraction of the outer sheath, for the release of the stent device from the delivery device.