Auto-injector with a time-delay system for indicating the withdrawal of the auto-injector

Abstract

An automatic injector comprising: a body (1) receiving a container (S), said container (S) containing a fluid product and comprising a plunger (P), such as a prefilled syringe; adapted to communicate with said container (S) The piston (P) cooperates with the piston rod (5), which is movable between the filling position and the injection position, and in the injection position, the piston rod (5) makes the piston (5) of the container (S) P) Movement to inject fluid into the injection site; visual, audible and / or sensory indication means for indicating to the user that the auto-injector can be removed from the injection site, the auto-injector including a time delay system , for delaying actuation of the visual, audible and / or tactile indication means relative to the end of injection, the delay system comprising a damper (16), a shearing mechanism (16) arranged in the damper (16) 19) and fluid arranged in said damper (16) around said shearing mechanism (19), one of said damper (16) and said shearing mechanism (19) being rotatably mounted on said body In (1), the other of the damper (16) and the shearing mechanism (19) is fixed in rotation, and the relative rotation of each other is affected by the fluid product contained in the damper (16). The shear brake, the damper (16) has protrusions (165) on its inner surface, the shearing mechanism (19) has protrusions (195) on its outer surface, the protrusions ( 165, 195) have a throttling effect on the flow of fluid products.

Description

technical field [0001] The present invention relates to an automatic injector. Background technique [0002] Autoinjectors are well known in the art. These devices are primarily used to automatically inject the contents of a syringe into a patient. Various systems exist for automatically piercing a needle into a patient and infusing a fluid contained in a syringe. Autoinjectors are relatively complex devices that must accommodate many constraints that increase safety and reliability. The robustness of the device, its ease of handling and its ease of use for the user are also important factors. In addition, most of these auto-injectors are disposable, and the production cost and assembly cost should also be considered factors. [0003] There are many auto-injectors on the market, however, which have a number of drawbacks. [0004] Therefore, especially when the fluid volume is large, and / or when the injected fluid is thick, it is desirable to be able to disperse the flui...

AI Technical Summary

Problems solved by technology

Therefore, it is not safe, reliable or desirable as the system is user dependent and in some cases the user may be disturbed or overwhelmed by the injection he or she is performing

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