A retention system for retaining a stent graft onto a deployment devicein which the stent graft has an exposed stent at at least one end. Thedeployment device has a capsule to receive the exposed stent duringdeployment and an arrangement to move the capsule to release the exposedstent when required. A release wire associated with the deployment deviceengages a portion of the exposed stent within the capsule to retain theexposed stent in the capsule. At least one retention loop on the stent graftisconnected around the release wire to prevent removal of the capsule from theexposed stent until the release wire has been removed from its engagementwith the exposed stent within the capsule and the retention loop is released.
