Drug delivery device with audible indicator spring

An apparatus of a drug delivery device, the apparatus comprising:

• a case configured to at least partially retain a plunger such that the plunger is moveable from a proximal position into a distal position for delivering a medicament, wherein the plunger defines an inner cavity configured to receive a drive spring to bias the plunger to move from the proximal position into the distal position;
• and
• an audible indicator to generate an audible signal, wherein the audible indicator comprises:
• at least one indicator element configured to transition from a supported state to an unsupported state when the plunger moves from the proximal position into the distal position to generate the audible signal, and
• at least one support element configured to (i) abut the plunger to maintain the at least one indicator element in the supported state, and (ii) relax radially inward to cause the at least one indicator element to transition from the supported state into the unsupported state when the plunger disengages from the at least one support element by moving from the proximal position into the distal position.

A drug delivery device, comprising:

• a plunger defining an inner cavity;
• a case configured to at least partially retain the plunger such that the plunger is moveable relative to the case from a proximal position into a distal position for delivering a medicament;
• a drive spring disposed in the inner cavity of the plunger and configured to bias the plunger from the proximal position into the distal position;
• and
• an audible indicator to generate an audible signal, wherein the audible indicator comprises:
• at least one indicator element configured to transition from a supported state to an unsupported state when the plunger moves from the proximal position into the distal position to generate the audible signal, and
• at least one support element configured to (i) abut the plunger to maintain the at least one indicator element in the supported state and (ii) relax radially inward to cause the at least one indicator element to transition from the supported state into the unsupported state when the plunger disengages from the at least one support element by moving from the proximal position into the distal position.

A method of indicating a completion of delivering a medicament using a drug delivery device, the method comprising:

• moving, by a drive spring, a plunger from a proximal position into a distal position to deliver a medicament, wherein the plunger is at least partially retained in a case of the drug delivery device, and wherein the drive spring is disposed in an inner cavity of the plunger;
• and
• causing an audible indicator to generate an audible signal for indicating a completion of delivering the medicament, wherein the audible indicator comprises:
• at least one indicator element configured to transition from a supported state to an unsupported state when the plunger moves from the proximal position into the distal position to generate the audible signal, and
• at least one support element configured to (i) abut the plunger to maintain the at least one indicator element in the supported state and (ii) relax radially inward to cause the at least one indicator element to transition from the supported state into the unsupported state when the plunger disengages from the at least one support element by moving from the proximal position into the distal position.