Sensor arrangement for an injection device
AssigneeSanofi-Aventis Deutschland GmbH
InventorStephan Mueller-Pathle
Life of this patent
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Abstract
The disclosure relates to a sensor arrangement for an injection device to determine an axial position of at least one device component of the injection device inside a housing of the injection device. The sensor arrangement includes an elongated member located inside the housing, extending in an axial direction and having at least a first section and a second section of different magnetization. The first and second sections are separated in an axial direction. The sensor arrangement also includes at least one magnetic sensor element attached to the housing to detect the axial position of at least one of the first and second sections.
Claims19
An injection device for setting and injecting a dose of a liquid medicament, the injection device comprising:
- a housing,
- at least a first device component arranged inside the housing, the first device component comprising an elongated member extending in an axial direction and having at least a first section and a second section of different magnetization, the first and second sections being separated in the axial direction,
- a second device component mechanically engaged with the elongated member and axially displaceable along the elongated member, wherein the second device component is configured to magnetically interact with a magnetic field of the elongated member,
- a sensor arrangement configured to determine an axial position of at least one of the first and the second device components, the sensor arrangement comprising at least one magnetic sensor element attached to the housing and operable to detect an axial position of at least one of the first and second sections, or operable to detect an axial position of the second device component relative to the elongated member or relative to the housing, wherein the elongated member comprises a helical pattern of differently magnetized sections and wherein the first section and the second section of different magnetization are part of the helical pattern of differently magnetized sections.
An injection device for setting and injecting a dose of a liquid medicament, the injection device comprising:
- a housing,
- at least a first device component arranged inside the housing, the first device component comprising an elongated member extending in an axial direction and having at least a first section and a second section of different magnetization, the first and second sections being separated in the axial direction,
- a second device component mechanically engaged with the elongated member and axially displaceable along the elongated member, wherein the second device component is configured to magnetically interact with a magnetic field of the elongated member,
- a sensor arrangement configured to determine an axial position of at least one of the first and the second device components, the sensor arrangement comprising
- at least one magnetic sensor element attached to the housing and operable to detect an axial position of at least one of the first and second sections, or operable to detect an axial position of the second device component relative to the elongated member or relative to the housing,
- wherein the second device component is threadedly engaged with the elongated member and is rotatably fixed to the housing but slidably displaceable relative to the housing, or the second device component is threadedly engaged with the housing and is rotatably fixed to the elongated member but is slidably displaceable relative to the elongated member.
An injection device for setting and injecting a dose of a liquid medicament, the injection device comprising:
- a housing,
- at least a first device component arranged inside the housing, the first device component comprising an elongated member extending in an axial direction and having at least a first section and a second section of different magnetization, the first and second sections being separated in the axial direction,
- a second device component mechanically engaged with the elongated member and axially displaceable along the elongated member, wherein the second device component is configured to magnetically interact with a magnetic field of the elongated member,
- a sensor arrangement configured to determine an axial position of at least one of the first and the second device components, the sensor arrangement comprising
- at least one magnetic sensor element attached to the housing and operable to detect an axial position of at least one of the first and second sections, or operable to detect an axial position of the second device component relative to the elongated member or relative to the housing,
- wherein the second device component is a last dose limiting member of a drive mechanism of the injection device.
Dependencies are inferred from the claim text.