A computational study of crimping and expansion of bioresorbable polymeric stents

This paper studied the mechanical performance of four bioresorbable PLLA stents, i.e., Absorb, Elixir, Igaki–Tamai and RevaMedical, during crimping and expansion using the finite element method. Abaqus CAE was used to create the geometrical models for the four stents. A tri-folded balloon was create...

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Bibliographic Details
Published in:Mechanics of time-dependent materials 2018, Vol.22 (2), p.273-290
Main Authors: Qiu, T. Y., Song, M., Zhao, L. G.
Format: Article
Language:English
Subjects:
Bends
Biocompatibility
Biomedical materials
Characterization and Evaluation of Materials
Classical Mechanics
Computer simulation
Deformation effects
Engineering
Finite element method
Folding
Loading rate
Mechanical properties
Peak pressure
Plastic deformation
Polymer Sciences
Solid Mechanics
Stents
Stiffness
Strain
Surgical implants
Time dependence
Yield stress
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Summary:This paper studied the mechanical performance of four bioresorbable PLLA stents, i.e., Absorb, Elixir, Igaki–Tamai and RevaMedical, during crimping and expansion using the finite element method. Abaqus CAE was used to create the geometrical models for the four stents. A tri-folded balloon was created using NX software. For the stents, elastic–plastic behaviour was used, with hardening implemented by considering the increase of yield stress with the plastic strain. The tri-folded balloon was treated as linear elastic. To simulate the crimping of stents, a set of 12 rigid plates were generated around the stents with a radially enforced displacement. During crimping, the stents were compressed from a diameter of 3 mm to 1.2 mm, with the maximum stress developed at both inner and outer sides of the U-bends. During expansion, the stent inner diameter increased to 3 mm at the peak pressure and then recoiled to different final diameters after balloon deflation due to different stent designs. The maximum stress was found again at the U-bends of stents. Diameter change, recoiling effect and radial strength/stiffness were also compared for the four stents to assess the effect of design variation on stent performance. The effect of loading rate on stent deformation was also simulated by considering the time-dependent plastic behaviour of polymeric material.
ISSN:1385-2000
1573-2738
DOI:10.1007/s11043-017-9371-y