Patent ID: 8920377

Claim:
An apparatus comprising: an outer housing associated with a medical injector, the outer housing defining a window; an inner housing at least partially disposed within the outer housing; an elastomeric member disposed within the inner housing; a carrier configured to receive a portion of the inner housing; a system actuator configured to release energy from an energy storage member to produce a force; a piston having a first end portion and a second end portion, the first end portion configured to receive the force to move the second end portion of the piston and the elastomeric member within the inner housing to move the apparatus from an initial configuration to an activated configuration, the carrier and the inner housing configured such that at least some of the portion of the inner housing is viewable through the window when the apparatus is in the initial configuration; and an indicator configured to move with the piston within the outer housing between a first position and a second position, at least a portion of the indicator being viewable through the window when the apparatus is in the activated configuration.