Abstract: An assistive device for use with a syringe comprises a housing for accommodating the syringe, a dispense member to be moved in a distal direction for dispensing a medicament from the syringe and a needle guard for covering a needle of the syringe before operation of the device. The dispense member comprises a first locking device and the housing comprises a second locking device for locking the dispense member to the housing when the needle guard in is a distal position, such that a movement of the dispense member in the distal direction is prevented.

Abstract: An instrument (20) has a well (28a-b) for receiving a dry cell (75), an opening (78) through which a first connector (74) is exposed to the well (28a-b), and a boss (76) adjacent the opening (78). The boss (76) precludes the wrong terminal of the dry cell (75) from engaging the first connector (74) when the dry cell (75) is inserted into the well (28a-b) in incorrect orientation. A second connector (80) includes a base (81), a first leg (82) resiliently connected to and extending away from the base portion, a second leg (84) resiliently connected to and extending away from the first leg (82), and a third leg (86) resiliently connected to and extending away from the second leg (84) and toward the first leg (82). A display (42) for the instrument (20) has a lens (90) having a substantially transparent substrate with a polyurethane coating. The instrument housing has first and second portions.