Disclosed herein is a stent implanted in the body of apatient. The stent includes a hollow cylindrical stent bodywhich is made of a super-elastic shape memory alloy and has anexpanded diameter part on one end thereof, and a support stentwhich has an elastic spherical structure and is fitted overthe cylindrical stent body behind the expanded diameter part.The stent is implanted in the body such that food that haspassed through the stomach is prevented from mixing with bileor pancreatic juice in the duodenum and moves directly intothe small intestine to prevent the duodenum from absorbingnutrients of the food while the small intestine directlydigests the food and absorbs the nutrients, thus minimizing anutrient absorption rate, thereby preventing the obesity ofthe patient.
