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

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, e...

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Bibliographic Details
Published in:BioMed research international 2013-01, Vol.2013 (2013), p.1-10
Main Authors: Herrera, Antonio, Ibarz, Elena, López, Enrique, Puértolas, José A., Bajador, Eduardo, Puértolas, Sergio, Gracia, Luis
Format: Article
Language:English
Subjects:
Adult
Animals
Bowen's Disease
Care and treatment
Colonic Neoplasms - complications
Colonic Neoplasms - pathology
Colonic Neoplasms - surgery
Colorectal cancer
Endoscopy, Digestive System - instrumentation
Endoscopy, Digestive System - methods
Female
Gastrointestinal diseases
Humans
Intestinal Obstruction - complications
Intestinal Obstruction - pathology
Intestinal Obstruction - surgery
Male
Middle Aged
Palliative Care
Peristalsis - physiology
Stent (Surgery)
Stents
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Summary: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.
ISSN:2314-6133
2314-6141
DOI:10.1155/2013/370582