Impact activated retention feature for drug delivery device

A drug delivery device comprising:

• a housing having a proximal end, a distal end, and a longitudinal axis extending between the proximal end and the distal end thereof;
• an injection assembly at least partially disposed within the housing at or near the proximal end thereof, the injection assembly including a needle or a cannula, a drug storage container, and a container holder adapted to at least partially surround the drug storage container;
• a drive assembly at least partially disposed within the housing and operably coupled with the injection assembly, the drive assembly including a trigger ring being movable between an initial position and a releasing position to deliver a medicament via the injection assembly and a nut at least partially disposed around a periphery of the trigger ring;
• and
• a shield slidably coupled with the housing and operably coupled with the drive assembly, the shield being positionable in an extended position in which at least a proximal end of the shield extends a distance beyond the proximal end of the housing and a retracted position in which the proximal end of the housing protrudes a distance beyond the proximal end of the shield, wherein upon moving the shield to the retracted position, a portion of the shield urges the trigger ring to the releasing position to deliver the medicament via the injection assembly;
• wherein the container holder, the nut, and the trigger ring cooperate to form a retention mechanism to prevent the trigger ring from activating to deliver the medicament via the injection assembly during unintentional movement of the housing.