CPC A61M 5/14212 (2013.01) [A61M 5/20 (2013.01); A61M 5/30 (2013.01); H02K 11/225 (2016.01); H02K 41/031 (2013.01); H02P 8/005 (2013.01); H02P 8/34 (2013.01); H02P 25/066 (2016.02); A61M 5/24 (2013.01); H02P 2203/01 (2013.01)] | 20 Claims |
1. A method, comprising:
initiating supply of current through a plurality of coils of a stator to apply a thrust force on an armature, thereby causing a stopper of a drug delivery device to translate distally to dispense a dose of a medicament, wherein, to apply the thrust force, the coils of the plurality of coils are supplied with an alternating or pulsed current such that magnetic fields are induced in the coils of the plurality of coils and interact with a static magnetic field generated by one or more magnets of the armature;
measuring an inductance of a coil of the plurality of coils; and
determining a dispensed dose of the medicament or an amount of medicament remaining in a cartridge based on the measured inductance.
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