A stent graft (1) has a tubular body (3) defining a main lumen and a side tube (5) defining a side tube lumen and in fluid communication with the main lumen and defining a junction (13) between the tubular body and the side tube. The junction includes an acute angle of attachment (α). A first zig-zag stent (15) is wrapped around the tubular body such that a V portion of the first zig-zag stent is engaged about the acute angle of the junction and a second zig-zag stent (23) is wrapped around the side tube, such that a V portion of the second zig-zag stent is engaged about the acute angle of the junction, whereby the main lumen and the side tube are each kept open, independently, allowing fluid to flow freely therethrough.
