Drug delivery system with multipolar magnet and sensor system
Inventors
Olesen, Laurits Hoejgaard • Bengtsson, Henrik • Johannsen, Leif • Baden-Kristensen, Keld • Soerensen, John Aasted
Assignees
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Publication Number
US-12478741-B2
Publication Date
2025-11-25
Expiration Date
Abstract
A drug delivery system comprises an indicator element and a sensor system. The indicator element is arranged to rotate relative to a reference component and corresponding to a reference axis and comprises a plurality of dipole magnets. The sensor system comprises a plurality of magnetometers arranged non-rotational relative to the reference component and adapted to determine continuous magnetic field values from the plurality of dipole magnets, as well as processor means configured to determine on the basis of measured values from the plurality of magnetometers a rotational position and/or a rotational movement of the indicator element.
Core Innovation
The invention relates to a drug delivery system in which a rotatable dose setting member and an actuatable release member are used to expel a set dose of drug. A drive spring arranged to be strained during dose setting and released by the release member is formed from a magnetisable material, and an indicator element coupled to a reference component comprises a plurality of dipole magnets, where the number of dipole magnets comprises 2, 3 or 4.
The system includes a sensor system with at least one magnetometer coupled to the dose setting member to determine continuous magnetic field values from the plurality of dipole magnets. A processor structure determines, based on the measured values, a rotational movement of the magnetometer relative to the indicator element and determines a rotational position between the indicator element and the magnetometer with a resolution of at least 18 degrees.
The determined rotational movement of the magnetometer corresponds to the set dose amount. In an add-on device embodiment, the add-on device is adapted to be releasably mounted on the drug delivery device, includes the magnetometer and processor structure, and determines the rotational position with a resolution of at least 18 degrees so that the determined rotational movement corresponds to the set dose amount. The document further relates to measurement approaches that use axial and tangential magnetic field measurement directions for determining rotational position and rotational movement.
Claims Coverage
The partial content includes two independent claims. Each independent claim contains a core inventive combination of a drug delivery device with a rotatable dose setting and a spring of magnetisable material driving dose expelling, and an indicator element with 2, 3 or 4 dipole magnets, together with magnetometer sensing and processor-determined rotational position and rotational movement mapped to the set dose amount. A minimum resolution of at least 18 degrees is recited in both independent claims.
Dose expelling with magnetisable drive spring and dipole-magnet indicator
A drug delivery system including a drug expelling structure with a rotatable dose setting member allowing a user to set a dose amount, a release member actuatable between proximal and distal positions to expel a set dose, and a drive spring strained during dose setting and released to drive expelling, wherein the drive spring is formed from a magnetisable material, and an indicator element coupled to a housing forming a reference component, the indicator element comprising a plurality of dipole magnets with 2, 3 or 4 dipole magnets.
Magnetometer sensing of continuous dipole-magnet fields with mapped rotational position
A sensor system comprising at least one magnetometer coupled to the dose setting member and adapted to determine continuous magnetic field values from the plurality of dipole magnets, and a processor structure configured to determine, on the basis of measured values from the at least one magnetometer, a rotational movement of the at least one magnetometer relative to the indicator element and determine a rotational position between the indicator element and the at least one magnetometer with a resolution of at least 18 degrees, wherein the determined rotational movement corresponds to the set dose amount.
Releasable add-on device using magnetometer processing of dipole-magnet indicator
An add-on device adapted to be releasably mounted on a drug delivery device, where the drug delivery device comprises a housing forming a reference component, a drive spring formed from a magnetisable material, and an indicator element coupled to the reference component comprising 2, 3 or 4 dipole magnets; the add-on device comprising at least one magnetometer adapted to determine continuous magnetic field values from the plurality of dipole magnets and a processor structure configured to determine a rotational movement of the at least one magnetometer relative to the indicator element and determine a rotational position between the indicator element and the at least one magnetometer with a resolution of at least 18 degrees, wherein the determined rotational movement corresponds to the set dose amount.
Overall, the claim coverage centers on determining dose amounts by measuring continuous magnetic field values from an indicator element with 2, 3 or 4 dipole magnets using at least one magnetometer and a processor that derives rotational movement and rotational position with a resolution of at least 18 degrees, where the determined rotational movement corresponds to the set dose amount. The add-on device claim covers a releasably mounted implementation using the same indicator element and rotational-position determination logic.
Stated Advantages
Canceling external magnetic disturbances and internal magnetic disturbances.
Documented Applications
A drug delivery system that determines set dose amounts based on rotational position and rotational movement derived from magnetometer sensing of an indicator element with dipole magnets.
An add-on device releasably mounted on a drug delivery device to determine rotational position and rotational movement corresponding to a set dose amount.
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