Injection device comprising an optical sensor
First Claim
Patent Images
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 a plurality of optically coded tracks arranged on an outer surface thereof,an optic sensor arrangement adapted to sense the optically coded tracks, anda control circuit coupled to the optic sensor arrangement adapted 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, andwherein the device further comprises structure for guiding a plurality of guided light beams, each light beam being guided so as to be incident on one optically coded track.
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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.
230 Citations
15 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 a plurality of 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 adapted 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, and wherein the device further comprises structure for guiding a plurality of guided light beams, each light beam being guided so as to be incident on one optically coded track. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification