a biodegradable double stent is used for various organs such as a biliary tract , an esophagus , an airway and a ureter . a biodegradable stent having a hollow cylindrical body woven out of a separate wire made of biodegradable polymer so as to have a plurality of rhombic spaces is fixed to an intermediate portion of a primary stent having a cylindrical body . when administered into the organ , the biodegradable stent has its original function of expanding the organ , and is firmly supported in the inner wall of a narrowed passage of the organ by pressurizing the inner wall of the narrowed passage of the organ . after a predetermined time period has elapsed , the biodegradable stent is gradually degraded away by bodily fluids , thereby enabling the primary stent to be easily removed from the organ .