System for Determining Position of Element
First Claim
1. A system comprising:
- a sensor assembly comprising one or more sensors each adapted to measure a magnetic field corresponding to three axes,a moveable element adapted to be moved relative to the sensor assembly by a combined axial and rotational movement corresponding to a pre-defined axis, the rotational movement having a pre-determined relationship to the axial movement,a magnet mounted to the moveable element and moving together therewith, the magnet configured to generate a spatial magnetic field which relative to the sensor assembly varies corresponding to both the axial and rotational movement of the magnet and thus the moveable element, thereby generating a spatial magnetic field which varies uniquely relative to each sensor, anda processor configured to determine on the basis of measured values an axial position of the moveable element.
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Accused Products
Abstract
System comprising a sensor assembly (3, 4, 5, 6) adapted to measure a magnetic field, and a moveable element (1) adapted to be moved relative to the sensor assembly between two positions by a combined axial and rotational movement, the rotational movement having a pre-determined relationship to the axial movement. A magnet (3) is mounted to the moveable element and configured to generate a spatial magnetic field which relative to the sensor assembly varies corresponding to both the axial and rotational movement of the magnet and thus the moveable element. A processor is configured to determine on the basis of measured values for the magnetic field an axial position of the moveable element.
64 Citations
24 Claims
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1. A system comprising:
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a sensor assembly comprising one or more sensors each adapted to measure a magnetic field corresponding to three axes, a moveable element adapted to be moved relative to the sensor assembly by a combined axial and rotational movement corresponding to a pre-defined axis, the rotational movement having a pre-determined relationship to the axial movement, a magnet mounted to the moveable element and moving together therewith, the magnet configured to generate a spatial magnetic field which relative to the sensor assembly varies corresponding to both the axial and rotational movement of the magnet and thus the moveable element, thereby generating a spatial magnetic field which varies uniquely relative to each sensor, and a processor configured to determine on the basis of measured values an axial position of the moveable element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A drug delivery system, comprising:
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a drug delivery device comprising; a reservoir containing a drug, a drug expelling mechanism for expelling drug from the reservoir, and an identifier representing information for the specific drug type contained in the reservoir or the specific drug delivery device, a capture assembly releasably mountable on the drug delivery device, comprising; an electronically controlled capturing system for capturing data representing a property related to the amount of drug expelled from the reservoir by the expelling structure, electronically controlled structure for capturing information from the identifier, logging structure adapted to create a log for amounts of drug expelled from the reservoir based on captured data, wherein the log is created for a given identifier. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification