An endoluminal prosthesis may be provided including an tubular graft having a proximal end, a distal end, and a main lumen disposed therein, the tubular graft comprising a first biocompatible material； a plurality of stents disposed about a surface of the tubular graft and arranged in longitudinally spaced rows； at least one aperture (42) disposed through a sidewall of the tubular graft, the at least one aperture (42) positioned between two longitudinally spaced rows of stents； a valve arrangement (44) associated with the at least one aperture, the valve arrangement (44) being secured to the graft about the at least one aperture； and, an outer liner (38) connected to the tubular graft between the proximal end and the distal end and surrounding the valve arrangement. In some embodiments, the valve arrangement comprises a third biocompatible material having four sides, wherein three of the four sides are secured to the graft.
