A stent graft delivery system (50) has a stent graft (74) retained on it. The stent graft has an exposed proximally extending self expanding stent (76) which is retained in a distally opening capsule (78) at the distal end of a nose cone dilator (58) on the delivery system. A trigger wire (80) extends from a release mechanism (82) the distal end of the delivery system into a first aperture (84) in the capsule, around a proximal bend (86) of the exposed stent and out of the first aperture in the capsule and extending proximally into a second aperture (88). The trigger wire prevents premature release of the exposed stent.
