Impact of Geometry Effects on Artery Stent Deployment Characteristics
Hashim V1, Resmi S L2, Dileep P N3, Jesna Mohammed4, Rajeev A5
1Hashim V*, Associate Professor, Dept. of ME, TKM College of Engineering, Kollam, Kerala, India.
2Resmi S L, Assistant Professor, Dept. of ME, TKM College of Engineering . Kollam , Kerala.
3Dileep P N, Professor, Dept. of ME, TKM College of Engineering . Kollam , Kerala.
4Jesna Mohammed, Assistant Professor, Dept. of ME, TKM College of Engineering . Kollam , Kerala .
5Rajeev A, Senior Scientist Assistant, Dept. of Medical Devices Engineering,SCTIMST, Trivandrum.
Manuscript received on November 22, 2019. | Revised Manuscript received on December 15, 2019. | Manuscript published on December 30, 2019. | PP: 2000-2003 | Volume-9 Issue-2, December, 2019. | Retrieval Number: B3247129219/2019©BEIESP | DOI: 10.35940/ijeat.B3247.129219
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Intravascular stenting is the leading treatment procedure for atherosclerotic coronary heart diseases. Among the various procedures, it is simpler and faster with a high initial success rate. Stent design, stent material, and clinical procedure decide the efficacy and life of stents. Strut thickness and crown radius are two essential design parameters that dictate expansion characteristics of stents. This research work discusses computational analysis of a specific stent, to explore the influence of thickness of strut on the deployment characteristics like stress/strain, foreshortening, recoil, and dog boning. The optimum stent design is one which gives maximum expansion with minimum stress distribution, dogboning, and elastic recoil. Five similar stent models with thickness ranges from 65μ to 105µ were modeled and computational method was adopted to simulate the transitory expansion nature of stent/balloon system. The FE results were substantiated with an in-vitro experiment. It was found that strut thickness has a major impact on stent recoil and low impact on foreshortening and dogboning. Foreshortening per unit expansion was almost same for entire models. Strut thickness 70μ to 80μ gives better expansion characteristics for the model under study.
Keywords: Coronary stent, Expansion characteristics, Finite Element Analysis (FEA), Stress/strain, Strut geometry.