New antireflux plastic stent for patients with distal malignant biliary obstruction

Figure 1 The new antireflux plastic biliary stent. A: The newly designed antireflux plastic stent with a “duckbilled” valve attached to the duodenal end of the stent; B: The valve remains open and allows the antegrade flow of bile; C: The valve closes as the intestinal pressure increases, preventing the reflux of the duodenal contents.