US 10,376,644 B2
Dose logging device for a drug delivery device
Nikolaj Frogner Krusell, Copenhagen OE (DK); and Nikolaj Eusebius Jakobsen, Valby (DK)
Assigned to Novo Nordisk A/S, Bagsvaerd (DK)
Appl. No. 14/781,139
Filed by Novo Nordisk A/S, Bagsvaerd (DK)
PCT Filed Apr. 3, 2014, PCT No. PCT/EP2014/056724
§ 371(c)(1), (2) Date Sep. 29, 2015,
PCT Pub. No. WO2014/161952, PCT Pub. Date Oct. 9, 2014.
Claims priority of provisional application 61/810,066, filed on Apr. 9, 2013.
Claims priority of application No. 13162517 (EP), filed on Apr. 5, 2013.
Prior Publication US 2016/0051760 A1, Feb. 25, 2016
Int. Cl. A61M 5/31 (2006.01); A61M 5/20 (2006.01); A61M 5/24 (2006.01); A61M 5/315 (2006.01); G06F 19/00 (2018.01)
CPC A61M 5/31 (2013.01) [A61M 5/20 (2013.01); A61M 5/24 (2013.01); A61M 5/31525 (2013.01); A61M 5/31553 (2013.01); A61M 5/31583 (2013.01); A61M 5/2466 (2013.01); A61M 5/31541 (2013.01); A61M 2005/3126 (2013.01); A61M 2205/3317 (2013.01); A61M 2205/50 (2013.01); A61M 2205/502 (2013.01); A61M 2205/60 (2013.01); G06F 19/3456 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A drug delivery system comprising:
a drug delivery device,
a logging device adapted to be releasably attached to the drug delivery device,
the drug delivery device comprising:
a drug reservoir or structure for receiving a drug reservoir,
a drug expelling structure comprising a dose setting structure allowing a user to set a dose amount of drug to be expelled,
an actuation structure actuatable between a first and a second actuation state, the first actuation state allowing a dose amount to be set by the dose setting structure, the second actuation state allowing the drug expelling structure to expel a set dose,
a first indicator structure comprising a magnet moving together therewith, the magnet being configured to generate a spatial magnetic field which relative to an external sensor structure varies corresponding to a spatial position and orientation of the magnet and thus the first indicator structure, wherein the first indicator structure is adapted to rotate during operation of the drug expelling structure corresponding to an axis of rotation, an amount of rotation corresponding to an amount of drug expelled from the drug reservoir by the drug expelling structure, and
a second indicator structure operatable between a first indicator state corresponding to the first actuation state, and a second indicator state corresponding to the second actuation state, the logging device comprising:
a sensor assembly comprising one or more sensors adapted to measure a magnetic field corresponding to at least two axes,
a state sensor structure adapted to detect whether the second indicator structure is in the first or second indicator state, and
a processor structure configured to:
(i) determine on the basis of measured magnetic field values a rotational position of the first indicator structure, and
(ii) calculate an expelled dose amount based on determined rotational positions of the first indicator structure,
a storage structure adapted to store one or more dose amounts comprising at least one of (a) the dose amount of drug to be expelled, (b) the amount of drug expelled from the drug reservoir, and (c) the expelled dose amount calculated by the processor, to create a log,
wherein the first indicator structure is in the form of an indicator element comprising the magnet moving together therewith, the magnet being configured to generate a spatial magnetic field which relative to the sensor assembly varies corresponding to the spatial position and orientation of the magnet and thus the indicator element, thereby generating a spatial magnetic field which varies uniquely relative to each sensor, the indicator element being adapted to:
(i) rotate during operation of the expelling structure, and
the indicator element also forms the second indicator structure, the indicator element being adapted to:
(ii) move axially between positions corresponding to the first and the second indicator state,
wherein a calculated expelled dose amount is based on the rotational position of the first indicator structure determined when the second indicator structure has been detected to be in the first indicator state.