The present invention concerns a self-expanding implant device comprising a proximal portion at a first longitudinal end, a distal portion at a second longitudinal opposite the first longitudinal end, and a connecting portion between the proximal portion and the distal portion, wherein the proximal portion and the distal portion each comprise a radially self-expanding structure, wherein the connecting portion comprises longitudinally oriented bendable struts, preferably at least 4 struts, more preferably 6 struts or more, which connect the self-expanding structure of the proximal portion with the self-expanding structure of the distal portion, wherein in a fully expanded state, the implant device comprises a maximum implant diameter along a direction perpendicular to the longitudinal direction and wherein the struts of the connecting portion comprise a strut length along the longitudinal direction, characterized in that the strut length is such that when the self-expanding structure of the proximal portion is in a compacted state and the self-expanding structure of the distal portion is not constrained radially, the self-expanding structure of the distal portion reaches a semi-expanded state comprising a diameter which is at least 60% of the maximum implant diameter.
