A self-expanding stent graft, comprising: a single elastic wire having first and second ends, the single elastic wire formed into a zig zag pattern of angular struts and bends connecting circumferentially adjacent angular struts, the single elastic wire helically wound and set into a continuous helical cylindrical pattern to form a tubular stent comprising a series of turns of bends and struts, and a tubular a graft having a proximal end, a distal end, and a length from the proximal end to the distal end, the tubular stent attached to the tubular graft along the length of the tubular graft; wherein substantially all of the angular struts are of the same length; wherein the helical cylindrical pattern comprises a relaxed state of the wire; wherein circumferentially adjacent bends define a pitch angle of the helical cylindrical pattern with respect to a plane transverse to the axis of the stent; wherein the bends and the angular struts define bisecting lines extending through the bends and between circumferentially adjacent angular struts, and the bisecting lines are angled at an angle from about 5° to about 20° with respect to a longitudinal axis extending through helical cylindrical pattern of the stent, wherein longitudinally adjacent angular struts and bends are spaced apart from each other in the wire's relaxed state; and wherein the stent is configured to bend one hundred and eighty degrees without kinking, characterised in that the ends of the single wire are formed into circular, non-helical rings having a zig-zag pattern of struts and bends, wherein the struts in the circular, non-helical rings are of unequal lengths. a single elastic wire having first and second ends, the single elastic wire formed into a zig zag pattern of angular struts and bends connecting circumferentially adjacent angular struts, the single elastic wire helically wound and set into a continuous helical cylindrical pattern to form a tubular stent comprising a series of turns of bends and struts, and a tubular a graft having a proximal end, a distal end, and a length from the proximal end to the distal end, the tubular stent attached to the tubular graft along the length of the tubular graft; wherein substantially all of the angular struts are of the same length; wherein the helical cylindrical pattern comprises a relaxed state of the wire; wherein circumferentially adjacent bends define a pitch angle of the helical cylindrical pattern with respect to a plane transverse to the axis of the stent; wherein the bends and the angular struts define bisecting lines extending through the bends and between circumferentially adjacent angular struts, and the bisecting lines are angled at an angle from about 5° to about 20° with respect to a longitudinal axis extending through helical cylindrical pattern of the stent, wherein longitudinally adjacent angular struts and bends are spaced apart from each other in the wire's relaxed state; and wherein the stent is configured to bend one hundred and eighty degrees without kinking, characterised in that the ends of the single wire are formed into circular, non-helical rings having a zig-zag pattern of struts and bends, wherein the struts in the circular, non-helical rings are of unequal lengths.