Injection device comprising an optical sensor
First Claim
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1. 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 at least one optically coded path or track arranged on an outer surface thereof,an optic sensor arrangement adapted to sense the optically coded path(s) or track(s), anda 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 path(s) or track(s) is/are arranged as helically extending path(s) or track(s) defining a series of information elements on the rotatably mounted member.
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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.
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Citations
18 Claims
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1. An injection device comprising:
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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 at least one optically coded path or track arranged on an outer surface thereof, an optic sensor arrangement adapted to sense the optically coded path(s) or track(s), 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 path(s) or track(s) is/are arranged as helically extending path(s) or track(s) defining a series of information elements on the rotatably mounted member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification