Abstract: A medical implant particularly suited for stabilizing an aortic aneurism. The implant is intended to be inserted into the patient and expanded to bring a graft into contact with inner wall linings of a blood vessel. The act of expanding the device also causes the device to separate from an insertion catheter used in placing the device. A preferred implant includes two plastic tubes spaced apart by a wire mesh that expands as the two tubes are moved closer together. A flexible graft covers the wire mesh so that as the mesh expands, the graft contacts inner wall linings of a blood vessel, typically the aortic artery.