Mechanical design of an intracranial stent for treating cerebral aneurysms

Yasuhiro Shobayashi, Tetsuya Tanoue, Satoshi Tateshima, Kazuo Tanishita

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1015-1024
Number of pages10
JournalMedical Engineering and Physics
Volume32
Issue number9
DOIs
Publication statusPublished - 2010 Nov
Externally publishedYes

Keywords

  • Cerebral aneurysm
  • Endovascular treatment
  • Flexibility
  • Mechanical estimation
  • Stent

ASJC Scopus subject areas

  • Biomedical Engineering
  • Biophysics

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