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特許 権利維持 PROBLEM TO BE SOLVED: To provide a stent that has a good performance of delivery (transportation through blood vessels), placement at an arbitrary position and re-constriction prevention without the need of warming it up in the body, and is hard to move from the initial placement position. ; SOLUTION: The stent 11 has an annular strut 13 with a bent 12, and a link 15 to connect the struts.