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  • Bronchial catheters designed for brachytherapy treatment of major bronchi. These catheters are usually of a single-lumen radiopaque design and are inserted through the working channel of a flexible bronchoscope into the affected bronchus. The catheter is left in position and (after the extraction of the bronchoscope) connected via an external tube to a remote afterloading brachytherapy system that delivers the high-dose radioactive source through the catheter to an area near the tumor. The source (e.g., iridium 192) is usually welded to a stainless steel wire that is advanced into the catheter in fixed steps called dwell positions. Frequently, several catheters are used simultaneously in each treatment. Brachytherapy bronchial catheters are used to treat malignant tumors in bronchi but not those in the pulmonary tissue.
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