Читать книгу Gastrointestinal Pathology - Группа авторов - Страница 13

Endoscopic snare devices have also been widely used for resection of polypoid as well as flat lesions throughout the gastrointestinal tract. They have been remarkably versatile and effective over the past four decades. Endoscopic snares typically involve a metallic wire, which may braided or monofilament (Figure 1.6).

A wire loop is generally constrained within a small caliber plastic catheter. At the distal end of the catheter, the wire loop can be opened to various sizes to grasp and resect polyps of different sizes. Typical sizes include loops 5–30 mm in diameter. There are numerous different shapes including oval, hexagonal, and asymmetric “duck bill.” Snares also come in various degrees of stiffness, which allow resection of lesions of many shapes and sizes. Tissue can be resected with mechanical closure alone (so‐called “cold snare”) or with mechanical plus electrosurgical cutting (“hot snare”). Recent studies suggest that cold snare is associated with lower risk of bleeding and bowel wall injury.