[1] Ni Xiaoyu, Wang Guo, Long Zhihong, Pan Changwang, et al. Analysis of mechanical performanceof braided esophageal stent structure and its wires [J]. Journal of Southeast University (English Edition), 2012, 28 (4): 457-463. [doi:10.3969/j.issn.1003-7985.2012.04.015]

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Analysis of mechanical performanceof braided esophageal stent structure and its wires()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

28

Issue:

2012 4

Page:

457-463

Research Field:

Biological Science and Medical Engineering

Publishing date:

2012-12-30

Info

Title:

Analysis of mechanical performanceof braided esophageal stent structure and its wires

Author(s):

Ni Xiaoyu¹;  Wang Guo²;  Long Zhihong²;  Pan Changwang³

¹School of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, China
²Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, C

Keywords:

braided esophageal stent;  finite element;  mechanical performance;  radial stiffness;  wire

PACS:

R318

DOI:

10.3969/j.issn.1003-7985.2012.04.015

Abstract:

This paper aims to find the relationship between the structural parameters and the radial stiffness of the braided stent and to understand the stress distribution law of the wires. According to the equation of the space spiral curve, a three-dimensional parametrical geometrical model is constructed. The finite element model is built by using the beam-beam contact elements and 3D beam elements. The constituent nitinol wires are assumed to be linear elastic material. The finite element analysis figures out that the radial stiffness of the stent and the stress distribution of the wires are influenced by all the structural parameters. The helix pitch of the wires is the most important factor. Under the condition of the same load and other structural parameters remaining unchanged, when the number of wires is 24, the stress of the wire cross-section is at the minimum. A comparison between the vitro experimental results and the analytical results is conducted, and the data is consistent, which proves that the current finite element model can be used to appropriately predict the mechanical performance of the braided esophageal stents.

References:

[1] Li N, Zhang H W, Ouyang H J. Shape optimization of coronary artery stent based on a parametric model[J]. Finite Elements in Analysis and Design, 2009, 45(6/7): 468-475.
[2] Li N, Zhang H W. Numerical research on longitudinal flexibility of a coronary stent[J]. Chinese Journal of Computational Mechanics, 2011, 38(3): 309-314.(in Chinese)
[3] Wang Y X, Yi H, Ni Z H, et al. Research on biomechanical characteristic of medical vascular stent[J]. Journal of Southeast University: Natural Science Edition, 2005, 35(2): 216-221.(in Chinese)
[4] Wang G, Ni Z H, Ni X Y, et al. Radial support properties of esophagus stent[J]. Journal of Southeast University: Natural Science Edition, 2011, 41(5): 987-991.(in Chinese)
[5] Ni X Y, Ni Z H, Pan C W. Analysis on fatigue life of esophagus stent based on finite element[J]. Journal of Southeast University: Natural Science Edition, 2009, 39(5): 919-922.(in Chinese)
[6] De Beule M, Van Cauter S, Mortier P, et al. Virtual optimization of self-expandable braided wire stents[J]. Med Eng Phys, 2009, 31(4): 448-53.
[7] Jedwab M R, Clerc C. A study of the geometrical and mechanical properties of a self-expanding metallic stent-theory and experiment[J]. Journal of Applied Biomaterials, 1993, 4(1): 77-85.
[8] Kim J H, Kang T J, Yu W R. Mechanical modeling of self-expandable stent fabricated using braiding technology[J]. J Biomech, 2008, 41(15): 3202-3212.
[9] Zheng Y F, Zhao L C. Biomedical nitinol[M]. Beijing: Science Press, 2004:39.(in Chinese)
[10] Huang Y P, Fan Z N, Li Y H, et al. Study for medical endoprosthesis mechanics efficiency and test method [J]. China Medical Device Information, 2008, 14(10):49-53.(in Chinese)

Memo

Memo:

Biography: Ni Xiaoyu(1975—), female, doctor, associate professor, xyni_luck@163.com.
Foundation items: The National Natural Science Foundation of China(No.51005124), the Opening Foundation of Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments(No.JSNB-2009-1-1).
Citation: Ni Xiaoyu, Wang Guo, Long Zhihong, et al. Analysis of mechanical performance of braided esophageal stent structure and its wires[J].Journal of Southeast University(English Edition), 2012, 28(4):457-463.[doi:10.3969/j.issn.1003-7985.2012.04.015]

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