Sensor, cartridge and drug delivery device

1. A sensor for measuring at least one physical or chemical parameter of a cartridge or syringe filled with a liquid substance, the sensor comprising:

a planar flexible foil configured to be arranged to an outer circumference of a barrel of the cartridge or syringe;

at least a first and a second measuring electrode arranged on the foil, wherein the first and the second measuring electrodes are configured as electrical capacity measuring electrodes or as temperature measuring electrodes; and

at least a first and a second contact electrode arranged on the foil, the first and the second contact electrodes being configured to provide an electrical contact to an external electric energy supply;

wherein the first contact electrode is connected to the first measuring electrode, and

wherein the second contact electrode is connected to the second measuring electrode.

2. The sensor according to claim 1 , wherein the first and the second contact electrodes are arranged at a longitudinal end section of the foil.

3. The sensor according to claim 1 , wherein the first and the second contact electrodes are separated in a longitudinal direction from one another and extend substantially parallel in a lateral or circumferential direction to one another.

4. The sensor according to claim 1 , wherein the first and second contact electrodes extend almost across the entire lateral dimension of the foil.

5. The sensor according to claim 1 , wherein the foil is substantially transparent, and wherein at least one of the first and second measuring electrodes or at least one of the first and second contact electrodes comprises a printed or coated conductive structure on or in the foil.

6. The sensor according to claim 1 , wherein the first and second measuring electrodes and the first and second contact electrodes are located on a common side of the foil or on opposite sides of the foil.

7. A cartridge comprising:

a tubular shaped barrel filled with a liquid substance; and

a sensor wrapped around the outer circumference of a sidewall of the barrel, the sensor comprising:

a planar flexible foil configured to be arranged to an outer circumference of a barrel of the cartridge or syringe;

at least a first and a second measuring electrode arranged on the foil, wherein the first and the second measuring electrodes are configured as electrical capacity measuring electrodes or as temperature measuring electrodes; and

at least a first and a second contact electrode arranged on the foil, the first and the second contact electrodes being configured to provide an electrical contact to an external electric energy supply;

wherein the first contact electrode is connected to the first measuring electrode, and

wherein the second contact electrode is connected to the second measuring electrode.

8. The cartridge according to claim 7 , wherein the sensor is adhesively attached to the barrel of the cartridge.

9. The cartridge according to claim 7 , wherein the contact electrodes of the sensor are located on an outward facing side of the foil.

10. A drug delivery device for administering a dose of a liquid medicament, the drug delivery device comprising:

a housing to accommodate a cartridge filled with the liquid medicament, the cartridge comprising:

a tubular shaped barrel filled with a liquid substance; and

a sensor wrapped around the outer circumference of a sidewall of the barrel, the sensor comprising:

a planar flexible foil configured to be arranged to an outer circumference of a barrel of the cartridge or syringe;

at least a first and a second measuring electrode arranged on the foil, wherein the first and the second measuring electrodes are configured as electrical capacity measuring electrodes or as temperature measuring electrodes; and

at least a first and a second contact electrode arranged on the foil, the first and the second contact electrodes being configured to provide an electrical contact to an external electric energy supply;

wherein the first contact electrode is connected to the first measuring electrode, and

wherein the second contact electrode is connected to the second measuring electrode,

the cartridge further comprising a piston slidably received in the barrel, the drug delivery device comprising:

a drive mechanism to exert a distally directed driving force on the piston for expelling of a dose of the liquid medicament;

an electrical energy supply electrically connectable to the first and second contact electrodes of the sensor;

a processor connected to the electrical energy supply; and

a transceiver connected to the processor.

11. The drug delivery device according to claim 10 , wherein the housing comprises a cartridge holder in which the cartridge is assembled.

12. The drug delivery device according to claim 10 , wherein the transceiver is operable or configured to withdraw and to obtain electrical energy from an external RF field and to provide electrical energy at least to the processor.

13. The drug delivery device according to claim 10 , further comprising at least one operating element electrically connected to at least one of the energy supply, the processor or the transceiver to initiate a sensor-based measurement or to initiate a communication with an external electronic device by the transceiver.

14. The drug delivery device according to claim 10 , wherein the electrical energy supply comprises a compartment housing a battery and a first and a second contact element electrically connected to the battery and extending through a through opening of the housing to electrically connect with the first and the second contact electrodes of the sensor, respectively.

15. The drug delivery device according to claim 14 , wherein the compartment is integrated into a cartridge holder, in a protective cap detachably covering at least a distal end of a cartridge holder or in an accessory device detachably connectable to the housing.