Anti-migration features and geometry for a shape memory polymer stent

A radially-expandable implant for implantation in a bodily passageway, the implant comprising a stent having a straight hollow tubular main body extending from an inside surface to an outside surface and from a first end to a second end thereof;

• wherein the main body is monolithic and defined by a solid wall devoid of openings between the inside surface and the outside surface;
• the main body comprising a molded shape-memory polymer and being expandable from an initial unexpanded state to an expanded state, wherein in the expanded state, the outside surface of the main body extends continuously and circumferentially around an entire circumference of the main body from the first end to the second end, wherein the inner surface of the main body defines a lumen of the tubular structure extending from the first end to the second end of the main body, wherein the outside surface of the main body includes outwardly extending protrusions molded with the main body, the protrusions formed in a geometric pattern comprising spaced apart helical or annular rings.

A radially-expandable implant for implantation in a bodily passageway, the implant comprising a stent having a straight hollow tubular main body extending from an inside surface to an outside surface and from a first end to a second end thereof, the main body being defined by a solid wall devoid of openings extending between the inside surface and the outside surface, the main body comprising a shape-memory polymer and being expandable from an initial unexpanded state to an expanded state, wherein the main body includes outwardly extending protrusions formed in a geometric pattern comprising helical or annular rings, the protrusions positioned only on the outside surface.