Injection devices

摘要

An injection device includes a multi-use drive assembly 10 and a single use disposable syringe assembly 12 releasably connected thereto. The syringe assembly includes a syringe 18 and a shield 26 mounted for telescopic movement. The drive assembly 10 is operable to extend the syringe 18 relative to the shield 26 and then to express a dose. Continued forward drive movement extends the shield 26 to re-cover the syringe needle 22 and then ejects the spent syringe assembly 12 in a safe (shrouded) condition.

主权项

1. A syringe assembly comprising:
a syringe having a syringe body and a needle extending from a distal-most application end of the syringe body; and a shield slideably mounted around the syringe body for telescopic movement between a retracted position in which the syringe needle is exposed in use and an extended position in which the needle is at least partially shrouded by the shield, wherein the shield is provided with a longitudinal control slot extending in a longitudinal direction along the shield, and the syringe body is provided with a projection which cooperates with the longitudinal control slot on the shield to control relative longitudinal movement of the syringe along the shield, wherein the projection slidably engages the slot to control the relative longitudinal movement of the syringe along the shield, wherein the control slot is provided with a latch recess configured to releasably retain the projection, wherein the wall of the slot, at least in the region of the latch recess, is resiliently deformable to allow the projection to snap out of the latch recess to allow the shield to move rearwardly relative to the syringe, and the syringe assembly further comprises a locking member engageable adjacent or near the control slot to inhibit resilient movement of the latch recess to prevent release of the projection.