Contact Free Absolute Position Determination of a Moving Element in a Medication Delivery Device
First Claim
1. A medication delivery device comprising:
- a position determining assembly for detecting absolute positions of a first member relative to a second member of the medication delivery device, the position determining assembly comprising;
a plurality of transmitter electrodes arranged on the first member, the plurality of transmitter electrodes being arranged along a substantially helical path,a plurality of receiver electrodes arranged on the first member, the plurality of receiver electrodes being arranged along a substantially helical path, wherein a number of transmitter electrodes form pairs of interconnected electrode elements with a number of receiver electrodes, anda reading assembly fixedly arranged relative to the second member, the reading assembly comprising a plurality of transmitters arranged to electrically couple to one or more receiver electrodes of the first member, and a plurality of receivers arranged to electrically couple to one or more transmitter electrodes of the first member.
1 Assignment
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Accused Products
Abstract
The present invention relates to a medication delivery device for expelling set doses of medicament, the medication delivery device comprising a position determining assembly for detecting absolute positions of a rotatably mounted member arranged within the device, the position determining assembly comprising a plurality of transmitter electrodes arranged on a first exterior surface part of the rotatably mounted member, a plurality of receiver electrodes arranged on a second exterior surface part of the rotatably mounted member. A number of transmitter electrodes form pairs of interconnected electrodes with a number of receiver electrodes. A reading assembly fixedly arranged relative to for example the housing of the medication delivery device is also provided. The reading assembly comprises a plurality of transmitters arranged to electrically couple to one or more receiver electrodes, the reading assembly further comprising a plurality of receivers arranged to electrically couple to one or more transmitter electrodes.
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Citations
25 Claims
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1. A medication delivery device comprising:
a position determining assembly for detecting absolute positions of a first member relative to a second member of the medication delivery device, the position determining assembly comprising; a plurality of transmitter electrodes arranged on the first member, the plurality of transmitter electrodes being arranged along a substantially helical path, a plurality of receiver electrodes arranged on the first member, the plurality of receiver electrodes being arranged along a substantially helical path, wherein a number of transmitter electrodes form pairs of interconnected electrode elements with a number of receiver electrodes, and a reading assembly fixedly arranged relative to the second member, the reading assembly comprising a plurality of transmitters arranged to electrically couple to one or more receiver electrodes of the first member, and a plurality of receivers arranged to electrically couple to one or more transmitter electrodes of the first member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for determining absolute positions of a first member relative to a second member of a medication delivery device, the method comprising:
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providing a plurality of transmitter electrodes arranged on the first member, the plurality of transmitter electrodes being arranged along a substantially helical path, providing a plurality of receiver electrodes arranged on the first member, the plurality of receiver electrodes being arranged along a substantially helical path, wherein a number of transmitter electrodes form pairs of interconnected electrode elements with a number of receiver electrodes, providing a reading assembly fixedly arranged relative to the second member, the reading assembly comprising a plurality of transmitters arranged to electrically couple to one or more receiver electrodes of the first member, and a plurality of receivers arranged to electrically couple to one or more transmitter electrodes of the first member, and providing first, second, third and fourth transmitter signals to respective ones of first, second, third and fourth transmitters of the reading assembly, the first, second, third and fourth transmitter signals being mutually shifted in phase. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification