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Snares designed to position and tighten fine-gauge, flexible, adjustable wire loops around a region of nasal tissue for mechanical 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; frequently they 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controls how much wire extends out of the channel and the movement of the sliding (cutting) loop as the loop is withdrawn into the cannula; the handle may be straight (e.g., Krause type) to the cannula or offset (bayonet type, also known as Lange type). Nasal snares may be single-use (i.e., disposable) or reusable; they are used mainly to remove polyps, tumors, and other abnormal tissue from the nasal cavities.
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