US Patent 7819242 Medicament delivery device

A medicament delivery device utilizing a housing having a chamber formed by a wall portion. The wall portion includes a weakened zone. A key shaft extends into the chamber and includes a portion lying outside the chamber or mating with a lock. The portion of the key shaft within the chamber serves as a support for a holder of a medicament. The medicament holder becomes accessible when a force is applied to the key shaft causing the same to egress from the chamber through the weakened zone of the wall portion.