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  • Biliary metallic stents that are designed to open (i.e., expand) automatically (i.e., self-expanding) (versus by balloon dilatation or other method) after deployment in the structure through an appropriate stent-delivery system. 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 biliary stents are used to open biliary-tree strictures (e.g., palliation of malignant strictures) without compromising the flexibility of the ducts.
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