The invention relates to a device (21) for placing a vascular implant (10) comprising a device (1) for dilating a vessel, consisting of an outer envelope (2) and a tapered end piece for introduction into a vessel, whereby said end piece consists of a nose (14) formed at the distal extremity of the outer envelope (2) and the dilation device comprises means for opening the nose (14), consisting of at least two longitudinal slots (16a, 16b, 16c, 16d) which divide the nose (14) into several segments (15a, 15b, 15c, 15d) which can be opened out in order to open the nose (14) and an implant (10) which is placed in the outer envelope (2). The invention is characterized in that the implant (10) comprises an expandable element (24) which can be placed on the internal wall of the outer envelope (2) it is provided with means for the translation of said implant (10) in relation to the outer envelope (2) such that the expandable element (24) can press against the internal wall of the nose (14) in order to open out the segments (15a, 15b, 15c, 15d) . The invention also relates to a device for placing vascular implants fitted with said device.La présente invention concerne un dispositif (21) pour la mise en place dun implant vasculaire (10) comprenant - un dispositif de dilatation (1) dun vaisseau avec une enveloppe externe (2) et une partie dextrémité effilée pour lintroduction dans le vaisseau, ladite partie dextrémité étant constituée dun nez (14) formé à lextrémité distale de lenveloppe externe (2) et le dispositif de dilatation (1), comportant des moyens douverture du nez (14) avec au moins deux fentes longitudinales (16a, 16b, 16c, 16d) partageant le nez (14) en plusieurs segments (15a, 15b, 15c, 15d) déployables pour ouvrir le nez (14) - un implant (10) placé dans lenveloppe externe (2), caractérisé par le fait que - limplant (10) comprend un organe expansible (24) sappliquant sur la paroi interne de lenveloppe externe (2) - il présente des moyens de translation de limpla
