57732 20170911124959.0 doi 10.1155/2013/370582 sideral 82351 ART-2013-82351 eng (orcid)0000-0002-3613-4209 Puértolas, S. Universidad de Zaragoza Study of the Behavior of a Bell-Shaped Colonic Self-Expandable NiTi Stent under Peristaltic Movements 2013 Access copy available to the general public Unrestricted Managing bowel obstruction produced by colon cancer requires an emergency intervention to patients usually in poor conditions, and it requires creating an intestinal stoma in most cases. Regardless of that the tumor may be resectable, a two-stage surgery is mandatory. To avoid these disadvantages, endoscopic placement of self-expanding stents has been introduced more than 10 years ago, as an alternative to relieve colonic obstruction. It can be used as a bridge to elective single-stage surgery avoiding a stoma or as a definitive palliative solution in patients with irresectable tumor or poor estimated survival. Stents must be capable of exerting an adequate radial pressure on the stenosed wall, keeping in mind that stent must not move or be crushed, guaranteeing an adequate lumen when affected by peristaltic waves. A finite element simulation of bell-shaped nitinol stent functionality has been done. Catheter introduction, releasing at position, and the effect of peristaltic wave were simulated. To check the reliability of the simulation, a clinical experimentation with porcine specimens was carried out. The stent presented a good deployment and flexibility. Stent behavior was excellent, expanding from the very narrow lumen corresponding to the maximum peristaltic pressure to the complete recovery of operative lumen when the pressure disappears. info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 0.0 2013 MEDICINE, RESEARCH & EXPERIMENTAL BIOTECHNOLOGY & APPLIED MICROBIOLOGY info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion (orcid)0000-0002-1732-2941 Bajador, E. Universidad de Zaragoza (orcid)0000-0002-3125-5802 Puértolas, J.A. Universidad de Zaragoza (orcid)0000-0003-2378-7187 López, E. Universidad de Zaragoza (orcid)0000-0003-0785-4132 Ibarz, E. Universidad de Zaragoza (orcid)0000-0001-7944-9625 Gracia, L. Universidad de Zaragoza (orcid)0000-0002-8643-7558 Herrera, A. Universidad de Zaragoza 1004 830 Universidad de Zaragoza Departamento de Cirugía, Ginecología y Obstetricia Traumatología y Ortopedia 1007 610 Universidad de Zaragoza Departamento de Medicina, Psiquiatría y Dermatología Medicina 5002 305 Universidad de Zaragoza Departamento de Ingeniería de Diseño y Fabricación Expresión Gráfica de la Ingeniería 5004 605 Universidad de Zaragoza Departamento de Ingeniería Mecánica Mec. de Medios Contínuos y Teor. de Estructuras 5001 065 Universidad de Zaragoza Departamento de Ciencia y Tecnología de Materiales y Fluidos Ciencia de los Materiales e Ingeniería Metalúrgica 2013 (2013), 370582 [10 pp] BioMed res. int. BioMed Research International 2314-6133 11316224 http://zaguan.unizar.es/record/57732/files/texto_completo.pdf Versión publicada 94393 http://zaguan.unizar.es/record/57732/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:57732 articulos driver 2017-09-11-12:21:28 ARTICLE