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Influence of strut cross-section of stents on local hemodynamics in stented arteries

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Abstract

Stenting is a very effective treatment for stenotic vascular diseases, but vascular geometries altered by stent implantation may lead to flow disturbances which play an important role in the initiation and progression of restenosis, especially in the near wall in stented arterial regions. So stent designs have become one of the indispensable factors needed to be considered for reducing the flow disturbances. In this paper, the structural designs of strut cross-section are considered as an aspect of stent designs to be studied in details. Six virtual stents with different strut cross-section are designed for deployments in the same ideal arterial model. Computational fluid dynamics (CFD) methods are performed to study how the shape and the aspect ratio (AR) of strut cross-section modified the local hemodynamics in the stented segments. The results indicate that stents with different strut cross-sections have different influence on the hemodynamics. Stents with streamlined cross-sectional struts for circular arc or elliptical arc can significantly enhance wall shear stress (WSS) in the stented segments, and reduce the flow disturbances around stent struts. The performances of stents with streamlined cross-sectional struts are better than that of stents with non-streamlined cross-sectional struts for rectangle. The results also show that stents with a larger AR cross-section are more conductive to improve the blood flow. The present study provides an understanding of the flow physics in the vicinity of stent struts and indicates that the shape and AR of strut cross-section ought to be considered as important factors to minimize flow disturbance in stent designs.

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Authors and Affiliations

  1. State Key Laboratory for Manufacturing System Engineering, Xi’an Jiaotong University, Xi’an, 710054, China

    Yongfei Jiang, Jun Zhang & Wanhua Zhao

Authors
  1. Yongfei Jiang
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  2. Jun Zhang
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  3. Wanhua Zhao
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Corresponding author

Correspondence to Wanhua Zhao.

Additional information

Supported by National Natural Science Foundation of China (Grant No. 5775179)

JIANG Yongfei, born in 1979, is currently a PhD candidate at State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, China. She received her master degree on mechatronics from Chang’an University, China, in 2008. Her research interests include the hemodynamics after stent implantation and stent structural design.

ZHANG Jun, born in 1978, is currently an associate professor at State Key Laboratory for Manufacturing System Engineering, Xi’an Jiaotong University, China. He received his PhD degree from Xi’an Jiaotong University, China, in 2009. His research interest includes high-speed machining.

ZHAO Wanhua, born in 1965, is currently a professor, a PhD candidate supervisor and a chair professor of “Cheung Kong Scholar” at State Key Laboratory for Manufacturing System Engineering, Xi’an Jiaotong University, China.

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Jiang, Y., Zhang, J. & Zhao, W. Influence of strut cross-section of stents on local hemodynamics in stented arteries. Chin. J. Mech. Eng. 29, 624–632 (2016). https://doi.org/10.3901/CJME.2016.0125.013

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  • DOI: https://doi.org/10.3901/CJME.2016.0125.013

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