Backflow-preventing valve gastric-biliary anastomosis stent

The invention provides a backflow-preventing valve gastric-biliary anastomosis stent. The anastomosis stent comprises a stent body whose two ends are of expansion structures, and a closed valve. One end of the stent body is provided with a gastric expansion end extending to the stomach, the other end of the stent body is provided with a biliary expansion end extending to the gallbladder, and the tail end of the closed valve is connected with the gastric expansion end. The stent body is of a cylindrical network structure. The surface of the stent body is covered by a membrane body. The diameter of the head portion of the closed valve is smaller than the diameter of the tail portion of the closed valve. The two ends of the stent body are of the expansion structures, and the biliary expansion end and the gastric expansion end can enable anastomosis between a gallbladder wall and a stomach wall to be stable and reliable. The valve structure can effectively prevent objects in the stomach from flowing to the gallbladder. The backflow-preventing valve gastric-biliary anastomosis stent can provide effective assistance for treatment of patients with gallstones and gallbladder polyps, prevents gallbladders of the patients from resection, can simplify the stone removal process and reduces pain of the patient.