A combination comprising an implantation system for a vascular implant and a vascular implant, the implantation system comprising: a sheath (20, 120) having a longitudinal axis, a lumen formed therein and a distal opening (26,124); a pusher (30, 130, 230, 260) positioned within the sheath, the pusher adapted to contact the vascular implant to deliver the implant from the sheath; and a sheath centering structure (40, 140, 240, 270) including an elongated portion (43, 143) and a plurality of arms (44, 144) extending from a distal portion of the elongated portion, the arms movable from a reduced profile position to an expanded position to move the sheath away from a vessel wall to a more centered position, the centering structure movable in a longitudinal direction relative to the pusher, wherein either the plurality of arms of the centering structure (40, 240, 270) are joined at an apex and terminate in free ends or the plurality of arms of the centering structure are joined at proximal and distal ends (146, 147) to form a basket-like structure, wherein the pusher (30, 130, 230, 260) comprises a lumen and the centering structure (40, 140, 240, 270) is slidably positionable within the lumen of the pusher so that it is movable between a retracted position wherein the distal portion (42, 142) of the centering structure (40, 140, 240, 270) is contained within the confines of the pusher in a collapsed position and an extended exposed position wherein the distal portion (42, 142) of the centering structure is exposed from the pusher to move to the expanded position, wherein the implant is adapted to move from a reduced profile position within the sheath (20, 120) to an expanded placement position outside the sheath, the implant configured for deployment through the distal opening (26, 124) in the sheath for implantation in a patient's body, the implant including a lumen and the centering structure (40, 140, 240, 270) being movable through the lumen, and the implant comprising a vessel filter, the filter moving to an expanded configuration when deployed from the sheath (20, 120). wherein either the plurality of arms of the centering structure (40, 240, 270) are joined at an apex and terminate in free ends or the plurality of arms of the centering structure are joined at proximal and distal ends (146, 147) to form a basket-like structure, wherein the pusher (30, 130, 230, 260) comprises a lumen and the centering structure (40, 140, 240, 270) is slidably positionable within the lumen of the pusher so that it is movable between a retracted position wherein the distal portion (42, 142) of the centering structure (40, 140, 240, 270) is contained within the confines of the pusher in a collapsed position and an extended exposed position wherein the distal portion (42, 142) of the centering structure is exposed from the pusher to move to the expanded position, wherein the implant is adapted to move from a reduced profile position within the sheath (20, 120) to an expanded placement position outside the sheath, the implant configured for deployment through the distal opening (26, 124) in the sheath for implantation in a patient's body, the implant including a lumen and the centering structure (40, 140, 240, 270) being movable through the lumen, and the implant comprising a vessel filter, the filter moving to an expanded configuration when deployed from the sheath (20, 120).