Stent graft assembly

A stent graft for deployment in an aortic arch including:

• a plurality of expandable stent rings arranged along a length of tubular graft material having a proximal end and a distal end, the plurality including a proximal stent ring at the proximal end of the tubular graft material and a distal stent ring at or near the distal end of the tubular graft material, and at least one intermediate stent ring between the proximal stent ring and the distal stent ring;
• at least one fenestration provided in a side wall of the tubular graft material;
• an internal branch disposed within a lumen and extending from one of the at least one fenestration toward an end of the stent graft;
• first and second circumferential regions at the proximal end of the graft material;
• a scallop in the first circumferential region and longitudinally aligned with the one of the at least one fenestration;
• wherein one of the at least one intermediate stent ring is a fenestration-supporting stent ring, wherein the fenestration-supporting stent ring is a zig-zag stent having a plurality of proximal apices and a plurality of distal apices, the proximal and distal apices connected to each other by a plurality of stent struts extending therebetween, wherein one of the distal apices is a fenestration-supporting apex;
• wherein the one of the at least one fenestration is provided between two struts of the fenestration-supporting stent ring, the combination of the two struts and the fenestration-supporting apex of the fenestration-supporting stent ring defining two sides and the distal end of the one of the at least one fenestration;
• wherein the one of the at least one fenestration has a proximal edge, the proximal edge including at least a portion that is substantially perpendicular to a longitudinal axis of the stent graft;
• wherein the proximal stent ring comprises a plurality of stent units, each stent unit comprising first and second struts connected by a proximal apex, the proximal stent ring comprising a plurality of distal apices, each stent unit being connected to a neighboring stent unit by one of the distal apices;
• wherein the plurality of stent units includes a plurality of scallop units, a plurality of supporting units, and a plurality of body units, wherein the proximal apex of each scallop unit is located at a laterally extending edge of the scallop in the first circumferential region, the proximal apex of each supporting unit is located in the second circumferential region, and the proximal apex of each body unit is located in the second circumferential region;
• wherein the proximal apices of each scallop unit do not extend proximally of the graft material of the scallop;
• wherein the first and second struts of each scallop unit are shorter than the first and second struts of each supporting unit.

A stent graft for deployment in an aortic arch including:

• a plurality of expandable stent rings arranged along a length of tubular graft material having a proximal end and a distal end, the plurality including a proximal stent ring at the proximal end of the tubular graft material and a distal stent ring at or near the distal end of the tubular graft material, and at least one intermediate stent ring between the proximal stent ring and the distal stent ring;
• at least one fenestration provided in a side wall of the tubular graft material;
• an internal branch disposed within a lumen and extending from one of the at least one fenestration toward an end of the stent graft;
• first and second circumferential regions at the proximal end of the graft material;
• a scallop in the first circumferential region and longitudinally aligned with the one of the at least one fenestration;
• at least one conformance tie disposed at least partially circumferentially about a distal end of the proximal stent ring and configured to constrict a diameter of the proximal stent ring;
• wherein one of the at least one intermediate stent ring is a fenestration-supporting stent ring, wherein the fenestration-supporting stent ring is a zig-zag stent having a plurality of proximal apices and a plurality of distal apices, the proximal and distal apices connected to each other by a plurality of stent struts extending therebetween, wherein one of the distal apices is a fenestration-supporting apex;
• wherein the one of the at least one fenestration is provided between two struts of the fenestration-supporting stent ring, the combination of the two struts and the fenestration-supporting apex of the fenestration-supporting stent ring defining two sides and a distal end of the one of the at least one fenestration;
• wherein the one of the at least one fenestration has a proximal edge, the proximal edge including at least a portion that is substantially perpendicular to a longitudinal axis of the stent graft;
• wherein the proximal stent ring comprises a plurality of stent units, each stent unit comprising first and second struts connected by a proximal apex, the proximal stent ring comprising a plurality of distal apices, each stent unit being connected to a neighboring stent unit by one of the distal apices;
• wherein the plurality of stent units includes a plurality of scallop units, a plurality of supporting units, and a plurality of body units, wherein the proximal apex of each scallop unit is located at a laterally extending edge of the scallop in the first circumferential region, the proximal apex of each supporting unit is located in the second circumferential region, and the proximal apex of each body unit is located in the second circumferential region;
• wherein the proximal apices of each scallop unit do not extend proximally of the graft material of the scallop;
• wherein the first and second struts of each scallop unit are shorter than the first and second struts of each supporting unit.