Biocompatibility of a new device of self-expandable covered and non-covered tracheal stent: comparative study in rats

Acta Cirúrgica Brasileira

Olavo Ribeiro Rodrigues¹  Hélio Minamoto²  Aristides Tadeu Correia²  Mauro Canzian²  Fabio Biscegli Jatene² 

[1] Universidade de Mogi das Cruzes;Universidade de São Paulo;

关键词: Stents;    Tracheal Stenosis;    Materials Testing;    Rats;   

DOI  :  10.1590/S0102-86502013000100003

来源: DOAJ

【 摘 要 】

PURPOSE: To investigate the compatibility of a new model of self-expandable tracheal stent in rats. METHODS: A new device of polyurethane covered and non - covered stent was placed in the trachea of Wistar rats. Animals were distributed in two groups: the polyurethane covered and non-covered group. Macroscopic parameters included position within the tracheal lumen, adherence to the mucosa, degree of dilatation, permeability and internal diameter. Microscopic findings evaluated were: incorporation, inflammatory activity, granulation tissue and epithelial revetment injuries. The observation follow-up was six weeks. All parameters were quantified based on determined score values. Incorporation of the stents was evaluated based on the observation if the stent was fixed into the trachea or if it could be removed. Degree of dilatation was performed by external diameter measurements. Granulation tissue was evaluated by measurements of height of the tissue growing into the tracheal lumen. RESULTS: 100% of non-covered stents had total attachment to mucosa and 100% of polyurethane covered type had adherence only. Regarding dilatation, granulation tissue, inflammatory activity and internal diameter measurements, there were no significant differences between the groups. Pathological tracheal wall injuries were present in both groups. CONCLUSION: Both models of stent demonstrated biocompatibility with the trachea. Rats are suitable for an experimental model of tracheal stent study.

【 授权许可】

Unknown