Measurement System for a Drug Delivery Device, Drug Delivery Device with Such a Measurement System and Method for Measuring the Dose Dispensed and/or Dose set of a drug delivery device

The measurement system of any one of the preceding claims, wherein the electronic processing unit (12) is configured to determine a movement direction of the dose control member (11) based on the two consecutive signals and the predetermined repeating sequence.

The measurement system of any one of the preceding claims, wherein the electronic processing unit (12) is configured to increase a sample rate of the sensor unit (14) when the two consecutive signals do not correspond to data values that are neighbors in the repeating sequence of different signals.

The measurement system of any one of the preceding claims, wherein the two consecutive signals comprise a leading signal corresponding to a first data value (A, B, C, D) and a trailing signal corresponding to a second data value (A, B, C, D), wherein, when the two consecutive signals do not correspond to neighbors in the repeating sequence, the electronic processing unit (12) is configured to determine a first distance from the first data value (A, B, C, D) to the second data value (A, B, C, D) along the repeating sequence in a forwards direction and to determine a second distance along the repeating sequence from the first data value (A, B, C, D) to the second data value (A, B, C, D) in a backwards direction, and wherein the electronic processing unit (12) is configured to increase the dose related count in relation to the first distance when the second distance is greater than a specific value, e.g., greater than 1.

The measurement system of any one of the preceding claims, wherein a movement of the dose control member (11) in relation to the housing (22) opposite to the direction (R) to increase the delivered or set dose is at least hindered.

The measurement system of any one of the preceding claims, wherein the dose control member (11) is configured to rotate and wherein the sensor unit (14) is configured to generate the signals corresponding to the different data values (A, B, C or D) depending on angular positions of the dose control member (11).

The measurement system of any one of the preceding claims, wherein the predetermined repeating sequence is associated with a Gray code, e.g., a 2-bit Gray code.

The measurement system of any one of the preceding claims, wherein the dose control member (11) comprises a series of sensing regions (L, H), wherein neighboring sensing regions (L, H) have different physical properties.

The measurement system of any one of the preceding claims, wherein the sensor unit comprises at least two sensor elements (16, 18) observing the dose control member (11).

Drug delivery device comprising a measurement system (10) of any one of the previous claims or configured to be coupled with such a measurement system, e.g., releasably coupled.