the balloon 66 is now inflated and blocks migration of the securement device off of the tube 70 as delivery tube 70 is further retracted the tips 480 f the legs 44 of the securement device 40 are no longer constrained in motion and they swing out as shown in fig8 and continue to swing out until they engage against the graft portion 24 of the stent graft 10 along the inner circumferential cylindrical face of the stent graft as shown in fig9 if necessary such as where the securement device is manufactured of a non shape memory material the second balloon 68 is inflated thereby expanding the lags 44 outwardly a the tips 48 about their intersection with hub 42 to secure tips 48 against the inner face of the graft portion of the stent graft the first balloon 66 provides maintenance of the securement device 40 on the tube 70 during deployment and also tends to center the tube 70 and thus the securement device 40 within the blood flow entry end 28 of the stent graft 10 once the securement device 40 is expanded to cause tips 48 thereof the contact the stent graft then the push rod 64 is moved in a direction to retract it from the incision causing movement of.