A stent for insertion in a fluid conduit of a human or animal body includes a hollow structure having generally circumferentially extending parts which have opposite end portions in the longitudinal direction. The circumferential parts are joined to a longitudinally adjacent circumferential parts along the length of the hollow structure wherein the end portions of adjacent circumferential parts are not in parallel planes and/or the end portions of the same part are not in parallel planes. Also, the non-parallel end portions are arranged along the length of the hollow structure such that a flow lumen defined by the hollow structure, and imposed on the flow lumen by the hollow structure when in the fluid conduit, follows a non-planar curve.