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Design of Prismatic Beams for Bending01:23

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The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention
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Self-expandable stent for thrombus removal modeling: Solid or beam finite elements?

Giulia Luraghi1, Sara Bridio1, Francesco Migliavacca1

  • 1Department of Chemistry, Materials and Chemical Engineering, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milan, Italy.

Medical Engineering & Physics
|August 4, 2022
PubMed
Summary
This summary is machine-generated.

Finite-element analysis of stent-retrievers for stroke treatment shows beam elements accurately model radial force and performance. Hexahedral elements may be crucial for stress analysis in self-expandable stents.

Keywords:
FEAFEMin silicothrombectomyverification

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Area of Science:

  • Biomedical Engineering
  • Computational Mechanics
  • Medical Device Simulation

Background:

  • Finite-element analysis (FEA) is increasingly used to study self-expandable stent performance, particularly for peripheral stents, transcatheter valves, and stent-grafts.
  • Accurate FEA models require careful selection of element dimensions (topology) and formulations (typology).
  • Specific FEA modeling information for stent-retrievers used in cerebral thrombus removal is lacking.

Purpose of the Study:

  • To investigate the impact of different element typologies and topologies on simulation results for stent-retrievers.
  • To perform a verification analysis for accurate and reliable computational simulations of stent-retriever performance.

Main Methods:

  • Analyzed hexahedral and beam element formulations through virtual crimping tests and simulated thrombectomy procedures.
  • Investigated three discretization refinements for each element type and compared full and reduced integration formulations.
  • Evaluated resultant radial force and stress fields generated in the thrombus.

Main Results:

  • Sensitivity analysis identified optimal settings for hexahedral and beam element formulations.
  • Both optimal settings yielded similar results for stent performance in virtual thrombectomy.
  • Beam element formulations proved sufficiently accurate for modeling radial force and stent-retriever performance.

Conclusions:

  • Beam element formulations are suitable for simulating mechanical thrombectomy with stent-retrievers.
  • Hexahedral formulations may be essential for stress analysis in self-expandable stents.
  • Recommended settings should be used in future mechanical thrombectomy simulations.