PROBLEM TO BE SOLVED: To provide a stent which holds performances such as deliverability, restenosis prevention and flexible shape followup ability, can be adapted not only to a bile duct but also the blood vessel system of a bent coronary artery or the like, and hardly causes restenosis.SOLUTION: The autonomous functional stent is composed of a Ti-Ni based shape memory alloy and has maximum expansion force at the center part in the length direction.COPYRIGHT: (C)2007,JPO&INPIT【課題】 デリバリー性、再狭窄防止性と柔軟な形状追随性等の性能を保持する胆管のみならず屈曲冠動脈などの血管系にも適応可能な再狭窄を生じ難いステントを提供すること。【解決手段】 自律機能性ステントは、Ti-Ni系形状記憶合金からなり、その長さ方向の中心部に最大拡張力を有する。【選択図】 図1
