Anti-migration micropatterned stent coating

An endoprosthesis having an expanded state and an unexpanded state, the endoprosthesis comprising:

• a stent, wherein the stent has an inner surface defining a lumen, an outer surface, a first end, a second end, and a thickness defined between the inner surface and the outer surface, wherein the stent has a plurality of openings extending through the thickness;
• and
• a polymeric member adhered to the outer surface of the stent, the polymeric member comprising a base having an inner surface adhered to the stent and an outer surface including a plurality of elongate protrusions extending outwardly from the base, wherein the plurality of elongate protrusions are arranged in one or more different micropatterns, wherein each of the plurality of elongate protrusions extends from the base to a concave top surface.

An endoprosthesis having an expanded state and an unexpanded state, the endoprosthesis comprising:

• a stent, wherein the stent has an inner surface defining a lumen, an outer surface, a first end, a second end, and a longitudinal axis extending therebetween, and a thickness defined between the inner surface and the outer surface, wherein the stent has a plurality of openings extending through the thickness;
• and
• a plurality of spaced apart elongated polymeric strips adhered to the stent with an adhesive layer, each of the plurality of elongated spaced apart polymeric strips extending helically around a circumference of the stent at least twice, each strip comprising a base having an inner surface facing the stent and an outer surface including a plurality of protrusions extending outwardly from the base, wherein the plurality of protrusions are arranged in one or more different micropatterns, wherein each of the plurality of protrusions extends between a base portion at the base of the polymeric strip and a top surface at an end of the protrusion opposite the base portion, wherein the top surface of each protrusion is concave, wherein the outer surface of the stent is exposed between longitudinally adjacent portions of a single polymeric strip and between the plurality of spaced apart polymeric strips.