This invention had the expansion possible abbreviation corrugated formative in circumferential direction, included the aforementioned abbreviation corrugated formative and the annular section which was formed was lined up vis-a-vis the longitudinal direction axis, aforementioned possessed the concatenated section which threads the abbreviation corrugated formative in the annular section which is adjacent through the other concatenated section between, in extended state, was jointed mutually the belt which ties the concatenated section which is adjacent vis-a-vis the longitudinal direction axis mutually to form backward two spirals, it regards sutento which features that wavelength of these spirals differs mutually. According to this invention, sutento where fatigue endurance after the detaining is high, expands uniformly in the process of expansion and heat treatment when producing, furthermore kurinpingu, sutento which it is easy to interpose in the delivery catheter is offered.本発明は、円周方向に伸長可能な略波形構成要素を有し、前記略波形構成要素を含んで形成された環状セクションが長手方向軸に対して整列しており、前記隣り合う環状セクション中の略波形構成要素を繋ぐ連結部を有し、拡張状態において、間に他の連結部を介さずに互いに接続された隣り合った連結部を結んだ線が長手方向軸に対して互いに逆向きの2つの螺旋を形成し、これら螺旋の波長が互いに異なることを特徴とするステントに関する。本発明によれば、留置後の疲労耐久性が高く、製造時の拡張、熱処理の工程において、均一に拡張するステント、更にはクリンピング、デリバリーカテーテルに挿入し易いステントが提供される。
