Behaviour of two typical stents towards a new stent evolution.
This study explores the analysis of a new stent geometry from two typical stents used to treat the coronary artery disease. Two different finite element methods are applied with different boundary conditions to investigate the stenosis region. Computational fluid dynamics (CFD) models including fluid-structure interaction are used to assess the haemodynamic impact of two types of coronary stents implantation: (1) type 1-based on a strut-link stent geometry and (2) type 2-a continuous helical stent. Using data from a recent clinical stenosis, flow disturbances and consequent shear stress alterations introduced by the stent treatment are investigated. A relationship between stenosis and the induced flow fields for the two types of stent designs is analysed as well as the correlation between haemodynamics and vessel wall biomechanical factors during the initiation and development of stenosis formation in the coronary artery. Both stents exhibit a good performance in reducing the obstruction artery. However, stent type 1 presents higher radial deformation than the type 2. This deformation can be seen as a limitation with a long-term clinical impact.
Department of Civil Engineering, Architecture and Georesources (DECivil) and CEris Researcher, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal. m.c.madeira.simao@tecnico.ulisboa.pt.
M
M
Simão
Researcher from Academic Medical Center of Lisbon Hospital Sta. Maria, Faculty of Medicine, University of Lisbon, Lisbon, Portugal.
J M
JM
Ferreira
Geomatics and Hydraulic Engineering Department, Universidad de Guanajuato, León, Guanajuato, Mexico.
J
J
Mora-Rodriguez
Full Professor of Surgery, NOVA Medical School, Lisbon, Portugal.
J
J
Fragata
Department of Civil Engineering, Architecture and Georesources (DECivil) and CEris Researcher, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal.
H M
HM
Ramos
D001807:Blood Vessel Prosthesis; D003198:Computer Simulation; D003251:Constriction, Pathologic / Q000503:physiopathology / Q000628:therapy; D003324:Coronary Artery Disease / Q000503:physiopathology* / Q000628:therapy; D003326:Coronary Circulation / Q000502:physiology*; D003331:Coronary Vessels / Q000503:physiopathology*; D020342:Finite Element Analysis; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D057446:Hydrodynamics; D008297:Male; D008875:Middle Aged; D008955:Models, Cardiovascular; D033081:Shear Strength / Q000502:physiology; D015607:Stents; D013314:Stress, Mechanical
Computational fluid dynamic (CFD); Coronary artery disease (CAD); Haemodynamic analysis; Stenosis; Stent geometry
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