Mechanical design of an intracranial stent for treating cerebral aneurysms

Yasuhiro Shobayashi*, Tetsuya Tanoue, Satoshi Tateshima, Kazuo Tanishita

*この研究の対応する著者

研究成果: Article査読

19 被引用数 (Scopus)

抄録

Endovascular treatment of cerebral aneurysms using stents has advanced markedly in recent years. Mechanically, a cerebrovascular stent must be very flexible longitudinally and have low radial stiffness. However, no study has examined the stress distribution and deformation of cerebrovascular stents using the finite element method (FEM) and experiments. Stents can have open- and closed-cell structures, and open-cell stents are used clinically in the cerebrovasculature because of their high flexibility. However, the open-cell structure confers a risk of in-stent stenosis due to protrusion of stent struts into the normal parent artery. Therefore, a flexible stent with a closed-cell structure is required. To design a clinically useful, highly flexible, closed-cell stent, one must examine the mechanical properties of the closed-cell structure. In this study, we investigated the relationship between mesh patterns and the mechanical properties of closed-cell stents. Several mesh patterns were designed and their characteristics were studied using numerical simulation. The results showed that the bending stiffness of a closed-cell stent depends on the geometric configuration of the stent cell. It decreases when the stent cell is stretched in the circumferential direction. Mechanical flexibility equal to an open-cell structure was obtained in a closed-cell structure by varying the geometric configuration of the stent cell.

本文言語English
ページ(範囲)1015-1024
ページ数10
ジャーナルMedical Engineering and Physics
32
9
DOI
出版ステータスPublished - 2010 11月
外部発表はい

ASJC Scopus subject areas

  • 生体医工学
  • 生物理学

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