Bryan J Macdonald

Collins Ave

Go Iwamatsu* Yoshihiro Amikura

Shoichiro Yoshihara

CiteSeerX

FE Simulation of the Expansion of a WE43                                               
Magnesium Alloy Stent in a Representative Blood Vessel  
Shoichiro Yoshihara*, Go Iwamatsu*, Yoshihiro Amikura* and Bryan J. MacDonald
†
 
*
 Department of Mechanidcal Engineering 
University of Yamanashi  
4-3-11Takeda, Kofu-city, 400-8511 Yamanashi, Japan 
e-mail: yoshihara@yamanashi.ac.jp, web page: http://www.yamanashi.ac.jp 
 
†
 School of Manufacturing and Mechanical Engineering 
Dublin City University (DCU) 
Collins Ave., Dublin 9, Ireland 
e-mail: bryan.macdonald@dcu.ie - Web page: http://www.dcu.ie 
 
ABSTRACT 
 
In recent years, there has been growing interest in the application of magnesium alloy materials to the 
manufacture of cardiovascular stents which are used expand blood vessels which have narrowed due 
to disease [1]. Conventional permanent stents, manufactured from stainless steel or titanium alloys, 
have seen widespread use but have recently been recognised as being limited by stent thrombosis and 
in-stent restenosis. Magnesium alloy stents, which naturally corrode and are absorbed in the body 
over time, have the potential to overcome many of the problems associated with conventional stent 
technology [2]. It is imperative, however, to fully understand the material deformation behaviour 
during the deployment of magnesium alloy stents in order to avoid problems such as material fracture 
during the expansion process. There are currently very few studies on the deformation mechanisms 
of magnesium alloy tubes and stents. It is particularly important to accurately predict fracture during 
the expansion process as there is significant potential to damage to the blood vessel and cause 
increased patient suffering. Thus, in this study, the material fracture of magnesium alloy stents has 
been evaluated and predicted using a combination of finite element analysis (FEA) and a ductile 
fracture criterion. Tensile tests and hydraulic bulge tests on the magnesium alloy stent material were 
used to determine the parameters for the ductile fracture criterion. The ductile fracture criterion is 
then used to predict failure of a magnesium alloy stent when deployed in a representative diseased 
blood vessel. 
 
 
REFERENCES 
[1] http://www.nims.go.jp/jpn/news/press/pdf/press136.pdf , (2006)(in Japanese). 
[2] E. Galvin, M. M. Morshed, C. Cummins, S. Daniels, C. Lally and B. MacDonald, “Surface 
Modification of Absorbable Magnesium Stents by Reactive Ion Etching”, Plasma Chem Plasma 
Process, 33, 1137–1152 (2013). 
 
 


FE Simulation of the Expansion of a WE43 Magnesium Alloy Stent in a Representative Blood Vessel

http://citeseerx.ist.psu.edu/viewdoc/download;jsessionid=9B1885E7F8E7AFAE40FB98221BC21186?doi=10.1.1.1037.1451&rep=rep1&type=pdf

FE Simulation of the Expansion of a WE43 Magnesium Alloy Stent in a Representative Blood Vessel

Abstract

Similar works

Full text

Available Versions

CiteSeerX