Medicament delivery device with vibration sensor

1. A button-activated medicament delivery device comprising:

a housing arranged to house a medicament container, and

a button assembly operatively connected to the housing, where the button assembly comprises:

an assembly housing;

a button movable relative to the housing and the assembly housing, where movement of the button causes medicament to be expelled from the medicament container;

a button spring operatively connected to the button that biases the button in an extended position relative to the assembly housing;

a switch having an open state and a closed state, where the switch is in the open state when button is in the extended position;

a vibration sensor configured to measure vibrations induced by the button-activated medicament delivery device during a medicament delivery,

processing circuitry configured to obtain a vibration measurement from the vibration sensor and to compare the vibration measurement with a reference vibration measurement characteristic for the button-activated medicament delivery device during medicament delivery, and

an energy storage unit that supplies energy to the vibration sensor and processing circuitry when the switch is in the closed position;

wherein the processing circuitry is configured to generate a time of measurement of the vibration measurement in case the vibration measurement matches the reference vibration measurement.

2. The button-activated medicament delivery device as claimed in claim 1 , comprising a storage unit configured to store the time of measurement.

3. The button-activated medicament delivery device as claimed in claim 1 , comprising a transmitter configured to wirelessly transmit the time of measurement.

4. The button-activated medicament delivery device as claimed in claim 1 , wherein when the button is in the closed state upon initiation of medicament delivery.

5. The button-activated medicament delivery device as claimed in claim 1 , wherein the processing circuitry is configured to compare amplitude and frequency content of the vibration measurement with amplitude and frequency content of the reference vibration measurement.

6. The button-activated medicament delivery device as claimed in claim 1 , comprising a circuit board arranged parallel to the energy storage unit, a first electrode defining a first electric pole and a second electrode defining a second electric pole, wherein the first electrode distances the circuit board from the energy storage unit.

7. The button-activated medicament delivery device as claimed in claim 1 , comprising a plate member having a through-opening, which plate member is arranged between the circuit board and the button, wherein the button spring is arranged between the plate member and the button.

8. The button-activated medicament delivery device as claimed in claim 7 , wherein the switch is aligned with the through-opening of the plate member and wherein the button has an actuation member aligned with the through-opening, which actuation member is arranged to actuate the switch.

9. The button-activated medicament delivery device as claimed in claim 1 , wherein the button assembly is releasably attached to a portion of the button-activated medicament delivery device.

10. The button-activated medicament delivery device as claimed in claim 1 , wherein the vibration sensor includes an acceleration sensor.

11. The button-activated medicament delivery device as claimed in claim 1 , wherein the button-activated medicament delivery device is an injector.

12. The button-activated medicament delivery device as claimed in claim 11 , comprising a plunger rod, wherein the vibration sensor, the button and the processing circuitry form part of the plunger rod.

13. The button-activated medicament delivery device as claimed in claim 1 , wherein the button activated medicament delivery device is an inhalator or an eye dispenser.