Medication delivery device with syringe sensing system

A medication delivery device comprising:

• a housing;
• a medication container positioned within the housing and having a container body to hold a medication and a slidable piston operably coupled with the container body, the slidable piston movable relative to the container body to dispense the medication from the medication container, the medication container being movable relative to said housing between a storage position and a delivery position;
• an accelerometer embedded on or affixed within the housing and disposed outside of the medication container such that the accelerometer does not directly contact the container body or the slidable piston;
• a drive spring adapted to, when a dispensing event is initiated, drive the medication container from the storage position to the delivery position;
• and
• a retraction spring adapted to, when a retraction movement is initiated, drive the medication container from the delivery position to the storage position;
• wherein the accelerometer is configured to detect a first acceleration caused by motion of the medication container relative to the housing as the medication container is driven from the storage position to the delivery position by the drive spring, and configured to detect a second acceleration caused by motion of the medication container relative to the housing as the medication container is driven from the delivery position to the storage position by the retraction spring;
• and
• a controller operably coupled with the accelerometer, wherein the controller is configured to determine an initiation of the dispensing event based on the detected first acceleration, and a completion of the retraction movement based on the detected second acceleration.