NDLI: Geometry Governs Mechanics of Cardiovascular Stents

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Graeham, R. Douglas Tan, Tho Wei Bond, Tim Phani, A. Srikantha
Copyright Year	2009
Abstract	Cardiovascular stents are tubular lattice structures implanted into a stenosed artery to provide adequate lumen support and promote circulation. Commonly encountered complications are stent migration, NeoIntimal Hyperplasia (NIH), and damage to the arterial wall. Central to all these problems is the mechanical response of a stent to forces operating in situ including stent-artery interaction. The influence of geometry or repetitive pattern of the stent upon its mechanical response is the subject of this study. We focus on damage to the arterial wall caused by the stent which can lead to eventual in-stent restenosis. Stent-artery compliance mismatch and longitudinal strain due to Poisson effect are hypothesized as the main contributing factors to restenosis. Finite Element Analysis (FEA) is employed to compare radial compliance and longitudinal strains of different stent geometries. Existing geometrical calculations in the literature [1] are applied to stents of different geometries to compute a non-dimensional NIH index. The main finding is that hybrid lattice stent designs exhibit negligible longitudinal strains (Poisson effect) as the stent expands/contracts during each Cardiac cycle. Wall stresses can be minimized though a careful tailoring of stent geometry.
Starting Page	417
Ending Page	426
Page Count	10
File Format	PDF
ISBN	9780791843758
DOI	10.1115/IMECE2009-12924
e-ISBN	9780791838631
Volume Number	Volume 2: Biomedical and Biotechnology Engineering
Conference Proceedings	ASME 2009 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2009-11-13
Publisher Place	Lake Buena Vista, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Restenosis Finite element analysis Cardiovascular stent Neointimal hyperplasia Cardiovascular system Geometry Stents
Content Type	Text
Resource Type	Article

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