Data collection apparatus for attachment to an injection device

1. A medicament administration apparatus comprising

a housing;

a drug container;

a dose setting member allowing a user to set a medicament dose to be delivered, wherein the dose setting member is a dosage knob that does not rotate during a dose delivery;

a release member moveable in a distal direction to permit the dose delivery;

an indicator adapted to rotate relative to the housing during the dose delivery, wherein an amount of rotation of the indicator indicates a delivered medicament dose; and

a sensor arrangement comprising:

a sensor adapted to measure the amount of rotation of the indicator, wherein the sensor is permitted to move axially together with the indicator; and

a processor configured to determine an amount of medicament expelled by the medication administration apparatus based on the amount of rotation that the sensor measured,

wherein the sensor is a magnetic sensor,

wherein the indicator comprises plural magnets, the plural magnets being provided around a circumference of a surface of the indicator, and

wherein the magnetic sensor varies its output due to variations in a magnetic field as the indicator and the plural magnets rotate relative to the housing.

2. The medicament administration apparatus of claim 1 , wherein the indicator is configured to rotate as the medicament is expelled from the medication administration apparatus.

3. The medicament administration apparatus of claim 1 , comprising an injection device and a data collection device,

wherein the injection device comprises the drug container, the dosage knob, and the release member,

wherein the data collection device comprises:

the sensor arrangement;

a first portion comprising the indicator; and

a second portion rotatably attached to the first portion and fixed in rotation relative to the housing.

4. The medicament administration apparatus of claim 3 , wherein the release member is an injection button or the second portion of the data collection device.

5. The medicament administration apparatus of claim 3 , wherein the first portion is configured for attachment to the injection device.

6. The medicament administration apparatus of claim 3 , wherein the first portion has one or more features configured for attaching the first portion to the dosage knob of the injection device.

7. The medicament administration apparatus of claim 3 , wherein the data collection device is configured to switch between a first configuration in which rotation of the first portion relative to the second portion is prevented, and a second configuration in which the first portion can be rotated relative to the second portion.

8. The medicament administration apparatus of claim 3 , wherein the first portion is configured to be rotated by the user causing the dosage knob of the injection device to turn, thereby causing a dosage amount to be programmed.

9. The medicament administration apparatus of claim 3 , wherein the indicator is the first portion of the data collection device.

10. The medicament administration apparatus of claim 3 , wherein the data collection device comprises a transfer arrangement engaging a rotatable component of the injection device, the transfer arrangement being configured to rotate the first portion relative to the second portion when the rotatable component rotates.

11. The medicament administration apparatus of claim 1 , wherein the sensor arrangement further comprises one or more of an optical sensor, a capacitive sensor and a mechanical sensor.

12. The medicament administration apparatus of claim 1 , wherein the drug container is an insulin container.

13. The medicament administration apparatus of claim 1 , wherein the processor is configured to cause transmission of information to a device.

14. The medicament administration apparatus of claim 13 , wherein the information comprises one or both of determined medicament dosages or time stamp information.