Patent ID: 9707357
Date: 2017-07-18
CPC Classifications: A61M

Claim:
1. An autoinjector comprising a lower body receiving a tank, said tank containing fluid product and comprising a piston and a needle, said autoinjector comprising a central body fastened to said lower body and an actuating sleeve provided with a contact end designed to make contact with the body of the user, said actuating sleeve being moveable between a projected position and an actuation position, said actuating sleeve being in a projected position prior to and after actuation of the autoinjector, an injection mechanism comprising the piston rod and an injection spring being provided to inject said fluid product through said needle when said needle is in an injection position in which it is inserted in the body of the user, said autoinjector comprising a tank movement device comprising a control ring, a control sleeve and a control slide, on the one hand to move the needle towards said injection position, and on the other hand to retract said needle out of the body of the user after injection of the fluid product, wherein the control ring is rotatably mounted in said central body, said control ring comprising a first internal inclined profile adapted to cooperate with a projection of the control sleeve secured to the tank, said control sleeve being moveable axially in said central body, such that rotation of the control ring causes said control sleeve to move axially, wherein said control ring is stressed in rotation by a pricking spring, formed by a torsion spring, the rotation of said control ring being blocked by the control slide that is moveable axially in said central body, said actuating sleeve cooperating, when it arrives in its actuation position, with said control slide to move it axially so as to unblock the rotation of said control ring and thus move the tank towards the injection position of the needle, the control slide comprising a projection that blocks the rotation of the control ring until the actuating sleeve is in its actuation position, said projection cooperating with an external inclined ramp of said control ring during its rotation, which brings the needle into its injection position, such that said control slide is moved axially relative to said control ring during said rotation; and wherein the injection mechanism cooperate with the tank movement device after injection of the fluid product to retract the needle.