US 11,717,607 B2
Drug delivery device with electromagnetic drive unit
Christian Nessel, Frankfurt am Main (DE); René Richter, Frankfurt am Main (DE); Robert Witt, Frankfurt am Main (DE); and Richard Guenther, Frankfurt am Main (DE)
Assigned to Sanofi-Aventis Deutschland GMBH, Frankfurt am Main (DE)
Filed by Sanofi-Aventis Deutschland GMBH, Frankfurt am Main (DE)
Filed on May 12, 2020, as Appl. No. 15/930,132.
Application 15/930,132 is a continuation of application No. 15/538,729, granted, now 10,682,459, previously published as PCT/EP2015/080674, filed on Dec. 18, 2015.
Claims priority of application No. 14199552 (EP), filed on Dec. 22, 2014.
Prior Publication US 2020/0268964 A1, Aug. 27, 2020
Int. Cl. A61M 5/14 (2006.01); A61M 5/142 (2006.01); H02K 41/03 (2006.01); H02P 8/00 (2006.01); A61M 5/30 (2006.01); H02K 11/225 (2016.01); A61M 5/20 (2006.01); H02P 25/066 (2016.01); H02P 8/34 (2006.01); A61M 5/24 (2006.01)
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
OG exemplary drawing
 
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.