Design and Finite Element Analysis of a Novel Retrievable Vascular Stent
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    Abstract:

    Objective In order to avoid early restenosis after DES implantation, the retrievable structure of the NiTi alloy stent and its biomechanical analysis were studied. Methods The models of the stent and the retrieval system were established using Solidworks. The retrieval structure involving four symmetrically distributed tendons is designed as circular meshes. The primary biomechanical properties of the stent such as the distribution of the maximum strain in the compression process and its uniformity in the compression and self-expansion processes were investigated through the finite element analysis, and the simulation experiments were also performed to study the retrieval process, indicating that no fracture or stumble occurred. Results The maximum strain of the stent was 3.7% and the index of non-uniformity was 0.62% as it was compressed to the minimum size. While the non-uniformity index was 1.31% after the self-expansion process completed. Furthermore, the maximum strain value was 1.52% when half of the stent was retrieved into the outer sheath. Conclusions Results of the preliminary experiments demonstrate that the stent can be safely and successfully retrieved into the outer sheath as the strain value is within the bearable range of the material and the compression and self-expansion process is relatively uniform. Thus, this paper presents our more recent efforts on the study of a new type of retrievable vascular stent, which provides an in-depth understanding of the structural design, biomechanical analysis as well as its potential clinical applications.

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History
  • Received:April 23,2020
  • Revised:June 05,2020
  • Adopted:June 17,2020
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