FEA Stent Deployment Simulation - Crimping
FEA Stent Deployment Simulation – Crimping

Stent Finite Element Analysis: Measured parameters

  • Maximum Stress & Strain: From initial loading to final device deployment
  • Recoil and Foreshortening after loading
  • Recoil and Foreshortening after deployment
  • Operating Stress Levels
  • Stent fatigue – safety factors: Goodman Diagram or Wöhler

Stent Finite Element Analysis : Scope

  • FEA for Coronary and peripheral stent
  • FEA for Aortic, Thoracic and Heart Valves Stent
  • FEA for CrCo, SS and other alloys stents
  • FEA for any cardiovascular device with metal alloy

Stent Finite Element Analysis : Applicable standards

Stent Finite Element Analysis: Associated tests

Stent Finite Element Analysis: Test method description

Finite element analysis is performed using stent models with cylindrical structure and radial wall displacement to cause stent deformation.  This method provides a higher reliability level than methods which use forced node displacement.  The stent can be crimped using a cylindrical structure placed on the outside (larger diameter than the stent).  Reversely the stent can be deployed using a cylindrical structure placed on the inside (smaller diameter than the stent).  The cylindrical structure is removed to study the recoil of the stent after crimping.  Foreshortening can be derived from recoil behavior.

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The design is modeled and then numerical simulations of different steps in the device life cycle are performed: crimping steps, deployment, recoil, operating stress at physiological pressure. Stress and strains are analyzed for each of those steps. FEA results can also be used to determine fatigue resistance limit in comparison to known metal S-N curves. A preliminary PASS or FAIL theoretical analysis can be conducted to determine the worst-case design to study: the design of device that will undergo the highest stress.