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1. WO2020225038 - AGENCEMENT DE CAPTURE DE ROTATION DESTINÉ À UN DISPOSITIF D’INJECTION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims

1. A rotation sensing arrangement for an injection device (1), the rotation sensing arrangement comprising:

a first member (201) and a second member (202), wherein the first member (201) and the second member (202) are rotatable relative to each other with regard to an axis of rotation (203),

at least one signal generator (210) arranged on the first member (201),

at least one sensor (220; 320) arranged on the second member (202), wherein the at least one sensor (220; 320; 420) comprises an interdigital electrode structure (230; 330; 430) configured to generate an electrical signal in response to a movement of the at least one signal generator (210) relative to the sensor (220; 320; 420),

a processor (240) connected to the at least one sensor (220; 320; 420) and operable to calculate an angle of rotation of the first member (201) relative to the second member (202) on the basis of the electrical signal.

2. The rotation sensing arrangement according to claim 1 , further comprising a planar substrate (250), wherein the at least one sensor (220; 320; 420) is arranged on the planar substrate (250).

3. The rotation sensing arrangement according to claim 2, wherein the interdigital electrode structure (230; 330; 430) is printed or coated on the planar substrate (250).

4. The rotation sensing arrangement according to any one of the preceding claims, further comprising a printed circuit board (260) and wherein the interdigital electrode structure (230; 330; 430) of the at least one sensor (220; 320; 420) is arranged on the printed circuit board (260) and wherein the processor (240) is arranged on the printed circuit board (260).

5. The rotation sensing arrangement according to any one of the preceding claims, wherein the interdigital electrode structure (230) is configured to generate an electric field (270) and wherein the at least one signal generator (210) is configured to modify the electric field (270). 6. The rotation sensing arrangement according to any one of the preceding claims, wherein the interdigital electrode structure (230; 330) comprises a first electrode (231) and a second electrode (232), wherein the first electrode (231) and the second electrode (232) are arranged in an interleaved geometric configuration.

7. The rotation sensing arrangement according to any one of the preceding claims, wherein the interdigital electrode structure (430) comprises a first electrode (431) and a second electrode (432), wherein the first electrode (431) and the second electrode (432) are mutually electrically connected by a meandering conductive structure (433).

8. The rotation sensing arrangement according to any one of the preceding claims, wherein the signal generator (210) comprises a signal generating portion (212) made of a material having a relative permittivity larger than 3, larger than 4, larger than 5, larger than 6, larger than 7, larger than 10, larger than 12, or larger than 15.

9. The rotation sensing arrangement according to any one of the preceding claims, wherein the interdigital electrode structure (230; 330) is configured to generate a magnetic field (280) and wherein the at least one signal generator (210) is configured to modify the magnetic field (280).

10. The rotation sensing arrangement according to any one of the preceding claims, wherein the at least one sensor (220; 320; 420) is arranged at a predefined radial sensor distance (D) from the axis of rotation (203) and wherein the at least one signal generator (210) is arranged at a predefined radial signal generator distance (d) from the axis of rotation (203) and wherein a difference between the radial sensor distance (D) and the radial signal generator distance (d) is smaller than or equal to a difference between a radial extent of the at least one sensor (220;

320; 420) and a radial extent of the at least one signal generator (210).

11. The rotation sensing arrangement according to any one of the preceding claims, wherein numerous sensors of the at least one sensor (220; 320; 420) are distributed across one side of the second member (202) and/or wherein numerous signal generators (210) of the at least one signal generator (210) are distributed across one side of the first member (201) facing towards the second member (202).

12. The rotation sensing arrangement according to any one of the preceding claims, wherein the at least one sensor (220; 320) and the at least one signal generator (210) are permanently out of mechanical contact.

13. The rotation sensing arrangement according to any one of the preceding claims 1-11 , wherein the interdigital electrode structure (430) is part of a strain gauge (422) attached to the second member (202) and wherein the interdigital electrode structure (430) exhibits a measureable variation in electrical conductance in response to a flexible deformation of the second member (202).

14. The rotation sensing arrangement according to any one of the preceding claims, further comprising at least one ratchet arrangement (290) engaged with at least one of the first member (201) and the second member (202), wherein the ratchet arrangement (290) is configured to support a rotation of the first member (201) relative to the second member (202) in discrete rotational steps.

15. An injection device for setting and expelling of a dose of the medicament, the injection device comprising:

a housing (10),

a trigger (11) to initiate and/or to control expelling of the dose,

a dial member (12) rotatable relative to the housing (10) for setting of the dose, and

a rotation sensing arrangement (200) according to any one of the preceding claims, wherein the first member (201) is rotationally locked to one of the dial member (12) and the housing (10) and wherein the second member (202) is rotatable relative to the other one of the dial member (12) and the housing (10).

16. A method of detecting and/or or quantitatively measuring a rotation of a first member (201) of an injection device (1) relative to a second member (202) of the injection device (1) as defined in claim 14, the method comprises the steps of:

inducing a torque to one of the first member (201) and the second member (202) relative to the other one of the first member (201) and the second member (202) thereby moving the at least one signal generator (210) relative to the at least one sensor (220; 320; 420),

measuring an electrical signal of the interdigital electrode structure (230; 330; 430) of the at least one sensor (220; 320; 420) response to the movement of the at least one signal generator (210) relative to the at least one sensor (220; 320; 420), and

processing the electric signal by the processor (240) and calculating an angle of rotation of the first member (201) relative to the second member (202) on the basis of the electrical signal.