Delivery device for delivering a stent device

A delivery device for delivering a stent device to a target treatment site, comprising:

• a 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;
• the anchorage being 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 comprises a stop for limiting axial movement of the stent device by abutting against a surface of the stent device, the stop being spaced a predetermined axial distance from the surface so that the remaining portion of the stent device is able to move the predetermined distance with the outer sheath during retraction of the outer sheath,
• wherein the stop is arranged to abut a proximal end surface of the stent device and is spaced proximally from the surface by the predetermined distance.