全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
-  2015 

镍钛合金支架关键尺寸对其疲劳性能影响的有限元分析

DOI: doi:10.7507/1001-5515.20150056

Keywords: 镍钛支架, 疲劳, 有限元, 圆弧段尺寸, 应变

Full-Text   Cite this paper   Add to My Lib

Abstract:

为了对镍钛合金支架的疲劳性能进行评价, 使用Ansys软件模拟支架生产过程中的扩张、热处理和压握等工序以及临床使用的释放过程, 分析了不同圆弧段尺寸对支架结构中应变分布的影响, 并采用疲劳图谱来研究具有不同支架圆弧段尺寸的镍钛合金支架的疲劳特性。本文研究发现:在承受血管载荷时, 具有不同圆弧段尺寸的三种支架结构的最大主应变均分布于圆弧段和支架杆相交的过渡点附近区域; 但是当圆弧段尺寸与支架杆尺寸相等时, 在圆弧段中心内侧位置也有很大的应变出现。这是由于圆弧段尺寸的差异引起了镍钛合金支架杆截面惯量的差异, 从而导致支架结构中应变分布区域的不同。此外, 由疲劳图谱可知当支架圆弧段尺寸取值为中间值时, 其疲劳安全性却是最好的。以上结果说明镍钛合金支架的疲劳性能与其圆弧段几何尺寸密切相关, 但并不是正相关关系

References

[1]  1. ECKER R D, SAUVAGEAU E, LEVY E I, et al.Complications of carotid artery stenting at a high-volume teaching center:experience of University at Buffalo endovascular fellows from 2004 to 2006[J].Neurosurgery, 2008, 62(4):812-816.
[2]  2. BUSSIèRE M, PELZ D M, KALAPOS P, et al. Results using a self-expanding stent alone in the treatment of severe symptomatic carotid bifurcation stenosis[J]. J Neurosurg, 2008, 109(3):454-460.
[3]  3. THéRIAULT P, TERRIAULT P, BRAILOVSKI V, et al. Finite element modeling of a progressively expanding shape memory stent[J]. J Biomech, 2006, 39(15):2837-2844.
[4]  4. SHOBAYASHI Y, TANOUE T, TATESHIMA S, et al. Mechanical design of an intracranial stent for treating cerebral aneurysms[J]. Med Eng Phys, 2010, 32(9):1015-1024.
[5]  5. 高振宇, 梁栋科, 齐民, 等.镍钛合金超弹性支架抗压缩性能的实验与分析[J].功能材料与器件学报, 2006, 12(1):49-53.
[6]  6. 赵振心, 刘道志, 孙康, 等.镍钛合金血管支架的有限元分析及疲劳测试[J].中国医疗器械杂志, 2008, 32(5):373-376.
[7]  7. DUMOULIN C, COCHELIN B. Mechanical behaviour modelling of balloon-expandable stents[J]. J Biomech, 2000, 33(11):1461-1470.
[8]  8. DUERIG T W, TOLOMEO D E, WHOLEY M. An overview of superelastic stent design[J]. Minim Invasive Ther Allied Technol, 2000, 9(3/4):235-246.
[9]  9. US Food and Drug Administration. The guidance for industry and FDA staff:non-clinical tests and recommended labeling for intravascular stents and associated delivery systems[C]//Maryland:2005:14-19.
[10]  10. LI J, LUO Q, XIE Z, et al. Fatigue Life analysis and experimental verification of coronary stent[J]. Heart Vessels, 2010, 25(4):333-337.
[11]  11. TABANLI R M, SIMHA N K, BERG B T. Mean strain effects on the fatigue properties of superelastic NiTi[J]. Metallurgical and Materials Transactions A, 2001, 32(7):1866-1869.
[12]  12. TOLOMEO D, DAVIDSON S, SANTINORANONT M. Cyclic property of superelastic nitinol:design implication[C]//Proceedings of the International Conference on Shape Memory and Superelastic Technologies. California:2001:471-476.
[13]  13. KUGLER C, MATSON D, PERRY K. Non-Zero mean fatigue test protocol for NiTi[C]//Proceedings of the International Conference on Shape Memory and Superelastic Technologies. California:2001:409-417.
[14]  14. PELTON A R, GONG X Y, DUERIG T. Fatigue testing of diamond shaped specimens[C]//International Conference on Shape Memory and Superelastic Technologies.International Organization on SMST. California:2003:293-302.
[15]  15. CANAN T, LEE M S. Drug-eluting stent fracture:incidence, contributing factors, and clinical implications[J]. Catheter Cardiovasc Interv, 2010, 75(2):237-245.
[16]  16. LEE M S, JUREWITZ D, ARAGON J, et al. Stent fracture associated with drug-eluting stents:clinical characteristics and implications[J]. Catheter Cardiovasc Interv, 2007, 69(3):387-394.
[17]  17. AOKI J, NAKAZAWA G, TANABE K, et al. Incidence and clinical impact of coronary stent fracture after sirolimus-eluting stent implantation[J]. Catheter Cardiovasc Interv, 2007, 69(3):380-386.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133