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  • Metallic tracheal stents that expand by themselves after deployment, applying a constant radial pressure to the tracheal walls. These devices consist either of compressed metallic stents that open by themselves as soon as they are released or of shape-memory stents manufactured from an alloy combining nickel and titanium (i.e., nitinol) that expands in response to body temperature. Some stents include radiopaque markers for accurate stent positioning. Self-expandable tracheal stents are typically deployed under local anesthetics using flexible bronchoscopes; they are mostly used to treat stenosis caused by injuries, benign diseases, or malignant tumors
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