A medical device having an outer and an inner expandable stent in which the inner expandable stent is coaxially disposed within the outer expandable stent. The medical device further includes three removable slat members carried by the outer stent and three removable slat members carried by the inner expandable stent. The removable slat members provide a substantially continuous cover for the medical device and thus impede the flow of blood through the walls of the medical device. When deployed within a blood vessel, some of the slat members serve to cover an aneurysm and restrict the blood flow into the aneurysm however, one or more of the slat members may be selectively removed to provide blood flow into a branching blood vessel.
