使用有限元素法分析血管動脈的支架之結構行為

Analysis of The Structural Behavior of Vascular Artery Stent Using Finite Element Method

廖俊閔(Chun-Ming Liao)

指導教授 ： 林震

國立臺北科技大學/機電學院/機電整合研究所/碩士(2014年)

摘要

隨著年齡的增加，新陳代謝與血液流動的能力下降，脂肪會殘留於血管壁而造成動脈的硬化和血管的狹窄，最後導致中風。為改善血管狹窄的問題，支架被設計用來維持血管的開通和幫助血液流通，但支架產生的結構行為會導致血管的再狹窄。透過研究支架的結構行為來改善再狹窄的問題，因此，本文設計八種支架的模型，改變支架的結構參數長、寬、厚度，探討這些參數對支架產生的影響。由結果得知，長度有助於植入過程的靈活性，寬度能降低支架的回縮率，厚度能增加支架的徑向強度與疲勞強度。

關鍵字

支架 ； 有限元素分析 ； 疲勞

並列摘要

As the increase of the age, the metabolic ability and the fluency of the blood gradually decrease. The fat remained in the blood vessel generates easily atherosclerosis and vascular stenosis. This leads to a stroke at last. To improve the problem, different stents are designed to expand the blood vessel and help the circulation of blood. However, the structural behavior of the stents results in restenosis of the blood vessels. This study analyzed the structural behavior of the stents to overcome the problem of the vascular restenosis. This study designed the molding of eight stents. The stents with variable parameters, length, width, and thickness, were employed to investigate the structural behavior of the stents. Simulation results showed that the length of stent helps the flexibility of implanting process, the width of stent reduces the retraction rate of stent, and the thickness of stent increases the radial and fatigued strength of the stent.

並列關鍵字

Stent ； Finite Element Analysis ； Fatigue

參考文獻

[10] M. Azaouzi, A. Makradi, ” Numerical investigations of the structural behavior of a balloon expandable stent design using finite element method,” Computational Materials Science, Vol. 72, 2013, pp. 54-61

[11] H. Hsiao, Y. Chiu, K. Lee, C. Lin, ” Computational modeling of effects of intravascular stent design on key mechanical and hemodynamic behavior,” Computer-Aided Design, Vol. 44, Issue 8, 2012, pp. 757-765

[12] J.A. Grogan, S.B. Leen, P.E. Mchugh, ”Comparing coronary stent materials performance on a common geometric platform through simulated bench testing,” Journal of the Mechanical Behavior of Biomedical Materials, Vol. 12, 2012, pp.129-138

[13] H.A.F. Santos, F. Auricchio, M. Conti, ”Fatigue life assessment of cardiovascular balloon-expandable stents – a two-scale plasticity-damage model approach,” Journal of the mechanical behavior of biomedical materials, 2012, Vol32, pp. 78-92

[14] Ehsan Masoumi Khalil Abad, Damiano Pasini, Renzo Cecere, ”Shape optimization of stress concentration-free lattice for self-expandable Nitinol stent-grafts,” Journal of Biomechanics, Vol. 45, Issue 6, 2012, pp.1028-1035