an endoscopic stent for implantation in a patient after sleeve gastrectomy or biliopancreatic diversion with duodenal switch or biliopancreatic diversion with duodenal switch comprising a stent portion , the stent portion comprising a proximal end portion , the proximal end portion defined by a length of about 50 mm to about 200 mm , an enlarged middle portion , a middle portion having an enlarged diameter relative to the proximal end portion and the distal end portion and defined by a length of about 20 mm to about 80 mm , and a distal end portion and a polymeric sleeve portion engaged to and extending distally from the distal end portion of the stent .