TY - JOUR
T1 - Numerical investigation of flexibility
T2 - Open-cell versus closed-cell stent designs
AU - Bekal, Chandrakantha
AU - Shenoy B., Satish
AU - Shetty, Ranjan
PY - 2020/4
Y1 - 2020/4
N2 - This numerical study investigates the advantages/disadvantages of two commercial coronary stent designs for its flexibility. Coronary stents are medical devices used to treat atherosclerotic coronary arteries. A variety of geometrical designs of stents are available in the market which can be broadly classified as open cell and closed cell stent designs based on ‘link’ positioning. Flexibility, one of the factors impacting implantation success, is influenced by stent geometry, particularly the ‘link’. In this study flexibility of two commercial stent designs Supraflex™ (Open-cell) and Yukon Choice (Closed-cell) are investigated using Finite Element Analysis package ANSYS workbench. Realistic and idealized stent models are used for simulation to measure the performance in terms of bending moment versus curvature index plot. Results suggest an upper hand for Stent T, as Stent S demonstrated direction-specific bending nature. Results also underscore the necessity of realistic modeling of geometry as ideal models over/underestimated the stress and bending in comparison to realistic models. The study highlights the drawbacks of the two-ring ‘unit cell’ model for flexibility measurement and recommends a model based on link positioning. The results throw light on the importance of the positioning of links in improving stent flexibility.
AB - This numerical study investigates the advantages/disadvantages of two commercial coronary stent designs for its flexibility. Coronary stents are medical devices used to treat atherosclerotic coronary arteries. A variety of geometrical designs of stents are available in the market which can be broadly classified as open cell and closed cell stent designs based on ‘link’ positioning. Flexibility, one of the factors impacting implantation success, is influenced by stent geometry, particularly the ‘link’. In this study flexibility of two commercial stent designs Supraflex™ (Open-cell) and Yukon Choice (Closed-cell) are investigated using Finite Element Analysis package ANSYS workbench. Realistic and idealized stent models are used for simulation to measure the performance in terms of bending moment versus curvature index plot. Results suggest an upper hand for Stent T, as Stent S demonstrated direction-specific bending nature. Results also underscore the necessity of realistic modeling of geometry as ideal models over/underestimated the stress and bending in comparison to realistic models. The study highlights the drawbacks of the two-ring ‘unit cell’ model for flexibility measurement and recommends a model based on link positioning. The results throw light on the importance of the positioning of links in improving stent flexibility.
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U2 - 10.15866/ireme.v14i4.18496
DO - 10.15866/ireme.v14i4.18496
M3 - Article
AN - SCOPUS:85090628196
SN - 1970-8734
VL - 14
SP - 224
EP - 229
JO - International Review of Mechanical Engineering
JF - International Review of Mechanical Engineering
IS - 4
ER -