Injection Device Comprising an Optical Sensor
AssigneeNovo Nordisk A/S
InventorsPreben M. Nielsen, Bodo von Munchow, Carsten B. Pedersen, Per M. Pedersen
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Abstract
The present invention relates to an injection device comprising an optically-based sensor for determining the position or setting of a dose setting member arranged to set a dose to be injected from the injection device. In particular, the present invention relates to an injection device comprising a rotatably mounted member having a plurality of optically coded paths arranged on an outer surface thereof. The rotatably mounted member is operatively connected to the dose setting member and is adapted to rotate with the dose setting member.
Claims21
A method for determining the position or setting of a dose setting member adapted to set a dose of a medicament to be injected from an injection device comprising a dose setting member, the dose setting member being operatively connected to a rotatably mounted member, the method comprising:
- projecting a plurality of light beams onto a plurality of optically coded tracks provided on an outer surface of a rotatably mounted member adapted to set a dose of medicament to be injected from an injection device, the optically coded tracks being arranged as parallel helically extending tracks on the rotatably mounted member, and
- detecting light intensities of a plurality of light beams reflected from the optically coded tracks, and
- determining the position or setting of the dose setting member from the detected intensities.
An injection device comprising:
- a dose setting member adapted to set a dose of a medicament to be injected from the injection device,
- a position determining arrangement for determining the amount of a set dose or the amount of an injected dose, the position determining arrangement comprising a rotatably mounted member having a plurality of parallel optically coded tracks arranged on an outer surface thereof,
- an optic sensor arrangement adapted to sense the optically coded tracks, and
- a control circuit coupled to the optic sensor arrangement to determine the position of the rotatably mounted member relative to the optic sensor arrangement,
- wherein the optically coded tracks are arranged as helically extending tracks on the rotatably mounted member.
Dependencies are inferred from the claim text.