In one aspect of the invention, a preloaded stent graft delivery device (100) includes a guide wire catheter (172) having a proximal end, a distal end, and a guide wire lumen (90) therethrough； a nose cone dilator (110) at the proximal end of the guide wire catheter, the nose cone dilator comprising a distal end and a capsule (111) on the distal end of the nose cone dilator； a handle assembly (123) at the distal end of the guidewire catheter, the handle assembly comprising a first section and a second section releasably connected to the handle assembly and in communication with the capsule on the distal end of the nose cone dilator； a ratchet assembly (188) disposed within an interior surface of the first section of the handle assembly； a pusher catheter extending from the handle assembly towards the nose cone dilator； and a sheath (106) disposed coaxially over the pusher catheter.
