Administration system, delivery device, and notification device for communicating status of a medical device

A delivery apparatus configured to deliver a dose of a medicament to a patient, the delivery apparatus comprising:

• a delivery device, comprising:
• a housing including a viewing window,
• a flexible container disposed within the housing and for storing the medicament therein,
• a needle movable between a retracted position, in which the needle does not protrude outside the housing, and an extended position, in which the needle protrudes outside the housing, the delivery device configured to move the needle between the retracted position and the extended position, with the delivery device retracting the needle to the retracted position after the dose of the medicament to the patient is delivered, and
• a visual identifier aligned with a portion of the viewing window, wherein a position of the visual identifier relative to the viewing window is dependent on a volume of the medicament within the container;
• wherein the visual identifier is movable relative to the viewing window between an empty position, in which the container is empty of medicament, and a full position, in which the container is at least partially full with medicament;
• and
• a notification device in communication with the delivery device, the notification device configured to communicate information about a status of at least one property of the delivery device;
• wherein the visual identifier comprises a cantilevered deflectable member, and wherein as the container is filled with the medicament, the container expands to deflect one end of the cantilevered deflectable member, with a position of the one end being visible through the viewing window.