Autoinjector

An autoinjector comprising a body receiving a reservoir, said reservoir containing fluid product and comprising a piston and a needle, said autoinjector comprising an actuating sleeve comprising a contact end designed to make contact with a user, said actuating sleeve being displaceable relative to said body receiving a reservoir between projected positions, in which said actuating sleeve at least partially projects out of said body receiving a reservoir, and an actuation position, in which said actuating sleeve is axially displaced towards an interior of said body receiving a reservoir, said actuating sleeve being in a first projected position prior to actuation of the autoinjector and in a second projected position after actuation of the autoinjector, wherein, in said second projected position, said actuating sleeve is projecting further out of said body than in said first projected position, wherein one of said actuating sleeve and said body receiving a reservoir comprises a flexible tab adapted to deform laterally relative to at least one of said actuating sleeve or said body receiving a reservoir when said actuating sleeve is displaced from its first projected position towards its actuation position then from its return actuation position towards its second projected position, said flexible tab comprising a flexible rod part that terminates in a head;

• and, in which said the other of said actuating sleeve and said body comprises a first groove receiving said head in said first projected position, an opening receiving said head in said actuation position, and a final reception zone receiving said head in said second projected position, said final reception zone being offset axially and laterally relative to said opening and being offset axially and laterally relative to said first groove, said opening being connected to said final reception zone by a laterally inclined groove starting at said opening and ending at said final reception zone, a fixed axial shoulder being provided between said final reception zone and said inclined groove, said flexible tab being adapted to slide in said laterally inclined groove when said actuating sleeve returns from its actuation position towards its second projected position, laterally deforming said flexible tab, said flexible tab clipping in on said fixed axial shoulder when said actuating sleeve reaches its second projected position, after use, locking said actuating sleeve relative to said body.