Patent ID: 6872190
Filing Date: 2005-03-29
Classification: A61M

Abstract:
1. A safety assembly for a prefilled syringe for injecting liquid, the syringe comprising a tubular body forming a reservoir for the liquid, carrying a needle for injecting the liquid, and having a plunger mounted in the body to be movable between a ready position and an end-of-injection position, the body of the syringe having a proximal end provided with a flange, the assembly further comprising: a tubular sheath in which the body of the syringe is designed to be housed in axially displaceable manner between an active position in which the needle projects through a distal end of the sheath and a protection position in which the needle is retracted inside the sheath; resilient return means for urging the body towards its protection position; locking means for preventing the body from moving relative to the sheath in the active position by opposing the resilient force of the return means; release means for releasing said locking means when the plunger is in its end-of-injection position; the locking means comprising two diametrically opposite lugs formed in a wall of the tubular sheath, each lug having a free end provided with a retractable catch; a cap mounted to slide axially on the sheath between two positions and having a proximal end with a hole for receiving the plunger; snap-fastening means comprising an internal catch for securing the cap to the tubular body, so that due to retraction of the retractable catches, the cap is moved by resilient return means; and two complementary shoulders acting as abutments, one on the cap, the other one on the tubular sheath, to limit the stroke of the cap once the locking means have been released, in opposition to the resilient force of the return means.