Patent ID: 8313463

Claim:
An injection device comprising: a housing adapted to receive a syringe having a discharge nozzle; a drive that is acted upon and in turn acts upon the syringe; a trigger movable from a rest position, in which it causes the drive to be retained, to an active position, in which it no longer causes the drive to be so retained, thus allowing its contents to be discharged through the discharge nozzle; and an interlock member movable between a locking position, at which it prevents movement of the trigger from its rest position to its active position, and a releasing position, at which it allows movement of the trigger from its rest position to its active position, the device having an indicator to show that it has been used provided by the trigger being retained in its active position and activating upon said trigger moving to an active position, said injection device further includes a latching projection and a corresponding latching surface against which the latching projection latches when the trigger is in its active position, thereby retaining said trigger in a depressed position.