A stent graft , comprising: a main body stent graft defining a lumen having a first end and a second end ; a diaphragm coupled to the main body stent graft , wherein the diaphragm defines at least three openings; and at least three stent graft extensions each defining a lumen, wherein a first end of each of the at least three stent graft extensions is coupled to one of the at least three openings; characterized in that the diaphragm is coupled to the main body stent graft within its lumen at a location ranging from the second end of the main body stent graft up to a midsection of the main body stent graft; and that the stent graft further comprises: a first stent graft extension defining a lumen and having a first end coupled to a first opening defined by the diaphragm ; a second stent graft extension defining a lumen and having a first end coupled to a second opening defined by the diaphragm; a third stent graft extension defining a lumen and having a first end coupled to a third opening defined by the diaphragm ; and a fourth stent graft extension defining a lumen and having a first end coupled to a fourth opening defined by the diaphragm , wherein the first opening , the second opening , the third opening , and the fourth opening are circular; wherein the first opening has a diameter larger than a diameter of the second opening and wherein the diameter of the second opening is larger than a diameter of the third opening and a diameter of the fourth opening . a main body stent graft defining a lumen having a first end and a second end ; a diaphragm coupled to the main body stent graft , wherein the diaphragm defines at least three openings; and at least three stent graft extensions each defining a lumen, wherein a first end of each of the at least three stent graft extensions is coupled to one of the at least three openings; characterized in that the diaphragm is coupled to the main body stent graft within its lumen at a location ranging from the second end of the main body stent graft up to a midsection of the main body stent graft; and that the stent graft further comprises: a first stent graft extension defining a lumen and having a first end coupled to a first opening defined by the diaphragm ; a second stent graft extension defining a lumen and having a first end coupled to a second opening defined by the diaphragm; a third stent graft extension defining a lumen and having a first end coupled to a third opening defined by the diaphragm ; and a fourth stent graft extension defining a lumen and having a first end coupled to a fourth opening defined by the diaphragm , a first stent graft extension defining a lumen and having a first end coupled to a first opening defined by the diaphragm ; a second stent graft extension defining a lumen and having a first end coupled to a second opening defined by the diaphragm; a third stent graft extension defining a lumen and having a first end coupled to a third opening defined by the diaphragm ; and a fourth stent graft extension defining a lumen and having a first end coupled to a fourth opening defined by the diaphragm , wherein the first opening , the second opening , the third opening , and the fourth opening are circular; wherein the first opening has a diameter larger than a diameter of the second opening and wherein the diameter of the second opening is larger than a diameter of the third opening and a diameter of the fourth opening . <EOS>