Patent ID: 7951206

Claim:
A medical stent comprising: a proximal end portion defining a lumen and including a first retention structure, the proximal end portion constructed from at least a first material having a first durometer value, the first retention structure includes a coil offset from a longitudinal axis of the medical stent, the proximal end portion defining a first opening and a second opening, the first opening and the second opening being in fluid communication with the lumen defined by the proximal end portion; a suture extending through the first opening and the second opening and being configured to facilitate the removal of the medical stent from a body of a patient; a distal end portion defining a lumen and including a second retention structure, the distal end portion constructed from at least a second material having a second durometer value, the second durometer value being greater than the first durometer value; and a central portion disposed between the proximal end portion and the distal end portion, the central portion defining a lumen in fluid communication with the lumen of the proximal end portion and the lumen of the distal end portion, the lumen of the central portion defining a longitudinal axis, the central portion constructed from the first material and the second material, the first material and the second material being co-extruded within the central portion such that the first material and the second material are distinct from each other and arranged substantially asymmetrically within a plane normal to the longitudinal axis.