A methodology for the customized design of colonic stents based on a parametric model

Puértolas, S. (Universidad de Zaragoza) ; Navallas, D. ; Herrera, A. (Universidad de Zaragoza) ; López, E. (Universidad de Zaragoza) ; Millastre, J. ; Ibarz, E. (Universidad de Zaragoza) ; Gabarre, S. ; Puértolas, J.A. (Universidad de Zaragoza) ; Gracia, L. (Universidad de Zaragoza)

Resumen: The choice of necessary stent properties depends mainly on the length of the stenosis and degree of occlusion. So a stent design with variable radial stiffness along its longitudinal axis would be a good option. The design proposed corresponds to a tube-based stent with closed diamond-shaped cells made from a NiTi alloy. By acting independently on different geometric factors, variable geometries can be obtained with different radial force reactions. A design adjustment according to specific requirements, in order to get a better fit to ill-duct and reduces complications, is possible. A parametric analysis using finite element has been conducted to determine the influence of slot length, number of circumferential slots, tube thickness and shape-factor on stent mechanical behavior, which allow eliminating the need for extensive experimental work and knowing and quantifying the influence of those factors. The results of finite element simulations have been used, by means of least-squares fit techniques, to obtain analytical expressions for the main mechanical characteristics of the stent (Chronic Expansive Radial Force and Radial Compression Resistance) in terms of the different geometrical factors. This allows the stent geometry to be customized without launching an iterative and costly process of modeling and simulation for each case.

Idioma: Inglés

DOI: 10.1016/j.jmbbm.2017.03.023

Año: 2017

Publicado en: Journal of the Mechanical Behavior of Biomedical Materials 71 (2017), 250-261
ISSN: 1751-6161

Factor impacto JCR: 3.239 (2017)

Categ. JCR: ENGINEERING, BIOMEDICAL rank: 18 / 78 = 0.231 (2017) - Q1 - T1
Categ. JCR: MATERIALS SCIENCE, BIOMATERIALS rank: 15 / 33 = 0.455 (2017) - Q2 - T2

Factor impacto SCIMAGO: 0.958 - Biomedical Engineering (Q1) - Mechanics of Materials (Q1) - Biomaterials (Q2)

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Traumatología y Ortopedia (Dpto. Cirugía,Ginecol.Obstetr.)
Área (Departamento): Área Expresión Gráfica en Ing. (Dpto. Ingeniería Diseño Fabri.)
Área (Departamento): Área Mec.Med.Cont. y Teor.Est. (Dpto. Ingeniería Mecánica)
Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)