Monitoring unit

1. A monitoring unit for a medicament delivery device, the monitoring unit comprises;

a housing comprising a longitudinal axis, a distal end and a proximal end;

a monitoring circuit arranged in said housing that can detect and monitor functions of the medicament delivery device;

an attachment mechanism comprising a ring shaped element having proximally directed releasable locking elements that are configured to flex radially to releasably attach to a terminal distal end of an outer housing of the medicament delivery device such that when the monitoring unit is releasably attached to the medicament delivery device the housing of the monitoring unit extends distally and outwardly along the longitudinal axis from the outer housing of the medical delivery device;

a mechanical interface arranged to interact with a mating mechanical interface arranged on a medicament delivery device; and

an activation switch arranged to activate said monitoring circuit.

2. The monitoring unit according to claim 1 , wherein said medicament delivery device is arranged with an activator element operably connected to a drive element of said medicament delivery device, wherein said drive element will force said activator element in a distal direction during dose delivery, acting on said activation switch.

3. The monitoring unit according to claim 2 , wherein said activation switch is a reed switch or hall switch and wherein said activator element is arranged with a magnet arranged to be detected by said reed switch or said hall switch when said medicament delivery device is operated.

4. The monitoring unit according to claim 2 , wherein said activation switch is a capacitive proximity sensor or an ultrasonic sensor positioned such in relation to said activator element that movement of said activator element during operation of said medicament delivery device is detected.

5. The monitoring unit according to claim 2 , wherein said activator unit comprises further information that can be derived from said activation switch.

6. The monitoring unit according to claim 5 , wherein said activation switch comprises an RGB colour sensor and wherein said activator element is provided with certain specific colours, where a specific colour is associated with certain information regarding the drug to be delivered.

7. The monitoring unit according to claim 2 , wherein said activation switch is a bar code reader or a QR reader and wherein said activator element is arranged with a bar code or a QR code containing information regarding the drug to be delivered.

8. The monitoring unit according to claim 2 , wherein said activation switch is an RFID/NFC reader and wherein said activator element is arranged with an RFID/NFC tag containing information regarding the drug to be delivered.

9. The monitoring unit according to claim 8 , wherein said communication circuit is operably arranged to receive data from external data providing sources.

10. The monitoring unit according to claim 1 , wherein said activation switch comprises at least one electrical switch operably arranged to activate said monitoring circuit.

11. The monitoring unit according to claim 1 , wherein said activation switch is a vibration sensor arranged to detect vibrations generated when said medicament delivery device is operated.

12. The monitoring unit according to claim 1 , wherein said activation switch is an opto switch arranged such that a light beam is broken when said medicament delivery device is operated.

13. The monitoring unit according to claim 1 , further comprising a communication circuit operably arranged to transmit data to external data handling sources.

14. The monitoring unit according to claim 1 , further comprising a user communication circuit operably arranged to communicate data with a user.

15. The monitoring unit according to claim 1 , wherein said attachment mechanism comprises a number of flexible locking elements arranged to interact with mating locking elements on the medicament delivery device.

16. A monitoring unit for a medicament delivery device, the monitoring unit comprises;

a housing comprising a longitudinal axis, a distal end and a proximal end;

a monitoring circuit arranged in said housing that can detect and monitor functions of the medicament delivery device;

an attachment mechanism arranged within the proximal end of the housing, where the attachment mechanism comprises a ring-shaped element having proximally directed releasable locking elements that are configured to releasably attach to a terminal distal end of an outer housing of the medicament delivery device such that when the monitoring unit is releasably attached to the medicament delivery device the housing of the monitoring unit extends distally from the outer housing of the medical delivery device;

a tubular holding member positioned within the housing and having a plate-shaped contact member comprising a proximally directed surface that is traverse to the longitudinal axis;

a releasable mechanical interface arranged on the proximally directed surface of the contact member that is configured to releasably interact with a mating mechanical interface arranged on the terminal distal end of the outer housing of the medicament delivery device; and

an activation switch arranged to activate said monitoring circuit.

17. The monitoring unit according to claim 16 , wherein the mechanical interface comprises a ring and a groove.

18. The monitoring unit according to claim 16 , wherein the activation switch detects vibrations in the medicament delivery device.

19. The monitoring unit according to claim 16 , further comprising a communication circuit operably arranged to receive and transmit data to external data handling sources.

20. The monitoring unit according to claim 16 , wherein the attachment mechanism further comprises distally projecting tongues.