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  • Surgical instruments designed to position and tighten fine gauge flexible or semirigid adjustable wire loops around a region of tissue for mechanical and/or electrosurgical resection and hemostasis. These devices typically consist of a hollow tubular structure (e.g., a cannula), with one or more adjustable wire loops (rings) that protrude at the working end; snares may include a stationary loop and a sliding loop. A mechanism at the proximal end (handle) controls how much wire extends out of the channel and the movement of the sliding (cutting) loop. Some snares allow circulation of RF electric current between the isolated metal loop (i.e., acting as an active electrode) and an external neutral electrode to heat the tissues, to facilitate cutting and coagulation. Snares are used mainly to remove polyps, tumors, and other abnormal tissue; dedicated endoscopic snares are used in procedures such as gastrointestinal (upper and lower tract) and airway polyp resection.
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