The invention relates to a sleeve (14) for an injection device (101 ) comprising a container (11) having an outer flange (13), said sleeve (14) being provided with one inner radial projection (20) intended to prevent the proximal movement of said outer flange (13) with respect to said sleeve (14) once said container (11 ) is received within said sleeve (14), said sleeve (14) being further provided with one inner longitudinal projection (15) extending distally from said inner radial projection (20) and intended to limit the radial movement of said outer flange (13), said inner radial projection (20) and inner longitudinal projection (15) being provided on a longitudinal leg (19) connected to said sleeve (14) by a deformable bridge (18) allowing radial deflection of said longitudinal leg (19) outwardly when a distal pressure is exerted on said inner radial projection (20), and inwardly when a proximal pressure is exerted on said inner radial projection (20). The invention also pertains to an injection device (101 ) comprising such a sleeve (14).La présente invention concerne une enveloppe (14) pour un dispositif dinjection (101) comprenant un conteneur (11) ayant un rebord externe (13), ladite enveloppe (14) étant fournie avec une saillie radiale interne (20) censée empêcher le mouvement proximal dudit rebord externe (13) par rapport à ladite enveloppe (14) lorsque ledit conteneur (11) se trouve à lintérieur de ladite enveloppe (14), ladite enveloppe (14) étant en outre fournie avec une saillie longitudinale interne (15) sétendant de manière distale de ladite saillie radiale interne (20) et censée limiter le mouvement radial dudit rebord externe (13), ladite saillie radiale interne (20) et ladite saillie longitudinale interne (15) étant fournies sur une jambe longitudinale (19) connectée à ladite enveloppe (14) par un pont déformable (18) permettant une déflexion radiale de ladite jambe longitudinale (19) vers lextérieur lorsquune pression distale est exercée sur ladi
