Stent graft

A stent-graft comprising:

• an inner stent having a wall structure including juxtaposed strut-patterns with interconnected struts and connectors connecting the strut-patterns, the wall structure of the inner stent having a predetermined length;
• an outer stent coaxially arranged around the inner stent and having a wall structure including juxtaposed strut-patterns with interconnected struts and connectors connecting the strut-patterns, the wall structure of the outer stent having a predetermined length;
• and
• a flexible stretchable material layer arranged between the inner stent and the outer stent, the wall structure of the inner stent having a design differing from the design of the wall structure of the outer stent, and the length of the inner stent being equal to the length of the outer stent, the struts of the inner stent being shorter than the struts of the outer stent.