Patent ID: 7291180

Claim:
A medical stent comprising: a single-piece stent body comprising: a first section defining a lumen and comprising a first retention structure, the first section comprising a first material having a first durometer value; a second section defining a lumen and comprising a second retention structure, the second section comprising a second material having a second durometer value, wherein the second durometer value is greater than the first durometer value; and a third section defining a lumen having a longitudinal axis, the third section located between the first and second sections, wherein the third section comprises a co-extrusion of the first and second materials, the first material and the second material being distinct from each other and arranged substantially asymmetrically within a plane normal to the longitudinal axis, the relative amount of the first material and the second material within the third section varying non-linearly within a plane parallel to the longitudinal axis.