Spring driven ophthalmic injection device with safety actuator lockout feature

An ophthalmic injection device comprising:

• a dispensing chamber housing having an inner surface and an outer surface, the inner surface partially defining a dispensing chamber for receiving a quantity of a substance;
• a plunger fluidly sealed to an interior surface of the dispensing chamber housing;
• a needle fluidly coupled to the dispensing chamber;
• a spring for providing a force to drive the plunger;
• a piston coupled to the plunger at one end and to the spring at the other end;
• an internal housing at least partially surrounding the piston;
• an external housing at least partially surrounding the dispensing chamber housing and the internal housing;
• a seal between an exterior surface of the piston and an interior surface of the internal housing;
• a vent located in a wall of the internal housing, the vent for allowing air to escape from the interior of the internal housing;
• an actuator coupled to a lockout bar;
• and
• a button that interfaces with the lockout bar;
• wherein the actuator moves the lockout bar when a condition is met, thereby allowing the button to be activated which allows the spring to provide the force to drive the plunger.