Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (38): 7133-7135.doi: 10.3969/j.issn.1673-8225.2010.38.025

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Stress change during the expanding process of magnesium alloy stents with different strut shapes and sizes

Qi Min, Si Chao-yang, Wang Wei-qiang   

  1. School of Materials Science and Engineering, Dalian University of Technology, Dalian   116024, Liaoning Province, China
  • Online:2010-09-17 Published:2010-09-17
  • About author:Qi Min☆, Doctor, Professor, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning Province, China minqi@dlut.edu.cn

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Abstract:

BACKGROUND: An important change of the degradation is the decreased size of the stents, thus affecting its support force. Due to the complexity of stent structure, stress distribution becomes complicated.
OBJECTIVE: To analyze the stress change generated during the expansion of magnesium alloy stents at various strut shape and size.
METHODS: Residual stress generated during the expanding process on cross-section stents with square, octagonal and circular strut was calculated by finite element method. Meanwhile, residual stress of different strut cross-section sizes (120, 140, 160,  180 μm) was also calculated. 
RESULTS AND CONCLUSION: After the stent expanded, the stress generated in circular strut cross-section was the maximium, as for three kinds of stents, the stress decreased with the decline of cross-section size. Strut cross-section shape and size both have an effect on the residual stress generated during expanding process.

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