Extension prosthesis for an arterial repair

A system for bypassing an aneurysm comprising a bypass prosthesis for extending through a portion of an aneurysm said bypass prosthesis comprising an expandable stent having a graft material disposed on a surface of the stent and having a proximal end and distal end each, upon expansion, with lumen openings of a predetermined diameters;

• an extension prosthesis comprising an expandable stent having a graft material disposed on a surface of the stent, said stent defining a proximal, medial, and distal zones, said proximal zone having a first diameter upon expansion and said medial zone having a second diameter upon expansion where said first diameter is greater than said second diameter where the proximal zone flares from the medial zone, an open proximal lumen formed in a proximal zone and an open distal lumen formed in the distal zone, where predetermined diameter of said bypass prosthesis upon expansion corresponds to said first diameter of said extension prosthesis so that the proximal zone of the extension prosthesis matingly engages and is overlapped by the distal end of the bypass prosthesis to form fluid tight seal and where said extension prosthesis is configured to extend through another portion of said aneurysm;
• and a sealing prosthesis configured to receive said proximal end of said bypass prosthesis, said sealing prosthesis comprises a stent having a gasket material disposed on a surface of the stent, said stent defining a hollow tube having a distal open end and a covered proximal end, said proximal end of said sealing prosthesis being configured to engage the proximal end of the bypass prosthesis or a portion thereof.