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Endobronchial Occlusion Stent: A Preliminary Experimental Study  

Choi, Yo-Won (Department of Radiology, Hanyang University Medical School)
Jeong, Woo-Kyoung (Department of Radiology, Hanyang University Medical School)
Lee, Seoung-Hoon (Department of Radiology, Hanyang University Medical School)
Heo, Jeong-Nam (Department of Radiology, Hanyang University Medical School)
Jeon, Seok-Chol (Department of Radiology, Hanyang University Medical School)
Ko, Gi-Young (Department of Radiology, University of Ulsan College of Medicine, Asan Medical Center)
Song, Ho-Young (Department of Radiology, University of Ulsan College of Medicine, Asan Medical Center)
Publication Information
Journal of the Korean Society of Radiology / v.63, no.2, 2010 , pp. 107-113 More about this Journal
Abstract
Purpose: To evaluate the safety and the technical feasibility of the use of an endobronchial occlusion stent and to get preliminary data for the development of the optimal material required for endobronchial occlusions. Materials and Methods: A commercialized, self-expandable tracheobronchial stent was modified; one half had a polyurethane cover with an occluded end and the other half was uncovered with a flaring configuration. The occluded end was placed such that it would face the distal lung. Under fluoroscopic guidance, seven stents were placed at the lower lobar bronchus in 6 mini-pigs. The bronchial obstruction was examined immediately after stent placement. Chest radiographs were taken at days 1, 7, 14, and 28 after stent placement and the removed airways from two, two, one, and one mini-pigs sacrificed on corresponding days were examined for the maintenance of bronchial obstruction. Results: Stents were successfully placed and induced the immediate bronchial obstruction in all mini-pigs. Five of seven airways with occlusion stents maintained an obstruction until the mini-pigs were sacrificed. Proximal stent migration occurred in two mini-pigs (29%), and pulmonary consolidations were observed distal to four of the stents (57%). Conclusion: The placement of an endobronchial occlusion stent and the obstruction of targeted bronchi seem to be feasible, but an add-on check valve should be considered to prevent stent migration and obstructive pneumonia.
Keywords
Bronchial Fistula; Stents; Respiratory Tract Fistula;
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