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US 11,717,607 B2Granted
Drug delivery device with electromagnetic drive unit
AssigneeSanofi-Aventis Deutschland GmbH
InventorsChristian Nessel, René Richter, Robert Witt, Richard Guenther
Life of this patent
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Abstract
The disclosure relates to a drug delivery device having a drive unit includes a stator comprising a plurality of coils consecutively arranged in an axial direction, and an armature axially movable within the stator, the armature including a number of magnets and pole shoes consecutively arranged in the axial direction. A respective pole shoe is arranged between respectively neighbouring magnets. At least one axial end of the armature comprises a terminal pole shoe.
Claims20
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.
1 more element
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 (i) the armature comprises a plurality of magnets and a plurality of pole shoes consecutively arranged in an axial direction, (ii) a respective pole shoe of the plurality of poles shoes is arranged between respectively neighboring magnets of the plurality of magnets, and (iii) at least one axial end of the armature comprises a terminal pole shoe;
- 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.
1 more element
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;
- 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,
- wherein the armature moves to a zero position when the coils of the plurality of coils are turned off.
2 more elements
Dependencies are inferred from the claim text.