Drug delivery device and methods of delivering a drug

A drug delivery device comprising:

• a housing defining a longitudinal axis and having an opening;
• a drug storage container disposed in the housing, the drug storage container including a delivery member;
• a plunger moveable in a distal direction with respect to the drug storage container to expel a drug from the drug storage container through the delivery member;
• a guard axially moveable relative to the housing between an extended position wherein at least a portion of the guard extends through the opening in the housing and a retracted position wherein the guard member is positioned away from the extended position toward the housing;
• and
• a lock ring configured to selectively rotate relative to the housing between a first rotational position and a second rotational position based on an axial position of the guard.

A method comprising:

• providing a drug delivery device including a housing defining a longitudinal axis and having an opening, a drug storage container having a delivery member, a plunger moveable with respect to the drug storage container to expel a drug from the drug storage container through the delivery member, a guard axially moveable relative to the housing between an extended position wherein at least a portion of the guard extends through the opening in the housing and a retracted position wherein the guard member is positioned away from the extended position toward the housing, and a lock ring rotatable relative to the housing;
• and
• applying a force to the housing to permit axial movement of the guard relative to the housing;
• wherein the lock ring is configured to selectively rotate relative to the housing between a first rotational position and a second rotational position based on an axial position of the guard.