Methods and apparatus for improved medication delivery devices

A medication delivery device comprising:

• a dose selector for selecting an amount of medication to deliver;
• a first capacitive sensor adjacent the dose selector and operative to detect linear displacement of the dose selector during medication delivery;
• a screw coupled to the dose selector;
• a second capacitive sensor adjacent the screw and operative to detect linear displacement of the screw during medication delivery;
• a transceiver;
• and
• a processor coupled to the first capacitive sensor, the second capacitive sensor, and the transceiver and operative to determine an amount of medication actually delivered by the medication delivery device based on a comparison of determined amounts of medication via the detected linear displacement of the dose selector and the detected linear displacement of the screw, wherein a variation in the determined amounts of medication greater than a predetermined limit sets off an alert to a user that the medication delivery device is no longer operating accurately, the processor further operative to communicate via the transceiver the determined amount of medication from the medication delivery device to a data management system or a blood glucose meter.