Study of the Behavior of a Bell-Shaped Colonic Self-Expandable NiTi Stent under Peristaltic Movements

Puértolas, S. (Universidad de Zaragoza) ; Bajador, E. (Universidad de Zaragoza) ; Puértolas, J.A. (Universidad de Zaragoza) ; López, E. (Universidad de Zaragoza) ; Ibarz, E. (Universidad de Zaragoza) ; Gracia, L. (Universidad de Zaragoza) ; Herrera, A. (Universidad de Zaragoza)

Resumen: 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.

Idioma: Inglés

DOI: 10.1155/2013/370582

Año: 2013

Publicado en: BioMed Research International 2013 (2013), 370582 [10 pp]
ISSN: 2314-6133

Factor impacto JCR: 0.0 (2013)

Categ. JCR: MEDICINE, RESEARCH & EXPERIMENTAL
Categ. JCR: BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Traumatología y Ortopedia (Departamento de Cirugía, Ginecología y Obstetricia)
Área (Departamento): Medicina (Departamento de Medicina, Psiquiatría y Dermatología)
Área (Departamento): Expresión Gráfica de la Ingeniería (Departamento de Ingeniería de Diseño y Fabricación)
Área (Departamento): Mec. de Medios Contínuos y Teor. de Estructuras (Departamento de Ingeniería Mecánica)
Área (Departamento): Ciencia de los Materiales e Ingeniería Metalúrgica (Departamento de Ciencia y Tecnología de Materiales y Fluidos)