Objective:To evaluate the clinical efficacy of self-expanding metallic stent(SEMS)in treatment of benign or malignant esophageal strictures and fistulas.
目的：评价食管支架治疗食管良恶性狭窄和瘘的临床疗效，探讨食管支架放置成功的影响因素。
Products included are bolts, screws, studs, U-bolts, preassembled screw and washer assemblies (sems), and products manufactured the same as sems except without washer.
产品包括：螺栓、螺钉、螺柱、U型螺栓、预装配的螺钉和垫片组件以及与预装配组件一样加工的无垫圈产品。
Primary endoscopic removal of an SEMS is feasible in the majority of patients with benign and malignant esophageal disease.
对于大多数有良性和恶性食管病变患者来说，自膨式金属支架一次性内镜移除是可行的。
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