Abstract: An injection system can have a Syringe Dose and Position Apparatus (SDPA) mounted to a syringe. The SDPA can have one or more circuit boards. The SDPA can include one or more sensors for determining information about an injection procedure, such as the dose measurement, injection location, and the like. The SDPA can also include a power management board, which can be a separate board than a board mounted with the sensors. The syringe can also include a light source in the needle. Light emitted from the light source can be detected by light detectors inside a training apparatus configured to receive the injection. The syringe can have a power source for powering the sensors and the light source. The SDPA and the power source can be mounted to the syringe flange.

Abstract: A drive assembly for a drug delivery device includes a drive mechanism comprising a piston rod and a drive member to drive the piston rod to dispense a dose of drug and a dose member coupled to the drive member. The assembly further comprises a return mechanism comprising a spring member. The assembly further comprises a movable member which is coupled to the spring member. In a setting, the movable member is coupled to the dose member and, the movable member is movable from an initial position to a dose set position, thereby biasing the spring member. In the dispensing, the drive member and the movable member are decoupled such that the drive mechanism is operable by the user by application of a driving force to the drive mechanism, wherein the spring member of the return mechanism drives the movable member independently of the driving force towards its initial position.