A stent graft can be held in place on the outside of the thoracic arch by a hypodermic needletube which passes through the bore of the stent graft and back to the user. A centretube tethered to the stent graft at the end distal to the user is employed to holdthe stent graft within the pulsatile blood flow, preventing the stent graft fromcollapsing during deployment. The position of both the hypodermic needle tubeand the centre tube can be controlled by the user by means of a control handle.
