SEMS with a distal antireflux valveA, Photograph demonstrating the modified self-expanding metallic Z stent with a built-in anti-reflux mechanism - the Dua stent. B, Photograph demonstrating a standard self-expanding metallic Z stent. (Adapted from Dua KS, Kozarek R, Kim J et al. Gastrointestinal Endoscopy 53(6):603-13, 2001; with permission.)
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This image is taken from Norman E. Marcon, Umar Beejay & Shou-jiang Tang. Chapter 3, In Upper Endoscopy, Advanced Digestive Endoscopy e-books. GastroHep.com.
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