Document Detail


Mechanical design of an intracranial stent for treating cerebral aneurysms.
MedLine Citation:
PMID:  20675176     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
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.
Authors:
Yasuhiro Shobayashi; Tetsuya Tanoue; Satoshi Tateshima; Kazuo Tanishita
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-08-01
Journal Detail:
Title:  Medical engineering & physics     Volume:  32     ISSN:  1873-4030     ISO Abbreviation:  Med Eng Phys     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422753     Medline TA:  Med Eng Phys     Country:  England    
Other Details:
Languages:  eng     Pagination:  1015-24     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 IPEM. Published by Elsevier Ltd. All rights reserved.
Affiliation:
School of Integrated Design Engineering, Graduate School of Keio University, Keio University, Hiyoshi, Kohoku, Yokohama, Japan. shobayashi@tani.sd.keio.ac.jp
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