Autoinjectors

An autoinjector, comprising:

• front (10) and rear (12) separable housing portions connectable and disconnectable by a coupling action,
• the rear housing portion comprising a drive mechanism (54), and
• the front housing portion being adapted in use to receive a syringe having a needle, and including an inspection window (18) through which the contents of the syringe may be viewed,
• the front housing portion also including a shutter arrangement movable between an open position and a closed position, the shutter arrangement being opened when said housing portions are connected and being closed when said portions are disconnected.

An autoinjector, comprising:

• front and rear separable housing portions configured to be reversibly coupled together,
• the front housing portion being adapted in use to receive a syringe having a needle, and
• the rear housing portion containing a drive mechanism that, in use, drives the syringe,
• the front housing portion including a retractable needle shield movable between an extended position in which the needle shield shields the needle of the syringe, and a retracted position in which the needle of the syringe is exposed;
• and
• a locking arrangement that, in a first mode, permits a retraction movement of the needle shield from the extended position to the retracted position and, in a second mode, locks said needle shield against retracting from the extended position to the retracted position,
• said locking arrangement automatically assuming the first mode upon the front and rear housing portions being coupled together, and automatically assuming the second mode upon the front and rear housing portions being separated from each other in a decoupling action.