Device for use with an inhaler, the inhaler having a body, an aerosol
canister arranged in the body containing medicament, including a metered
dose chamber and able to dispense a metered dose of the medicament, a
nozzle in fluid communication with the canister, an opening for
dispensing of the medicament in fluid communication with the nozzle. The
device includes elements for activating the canister to open and dispense
the medicament in response to an airflow in the inhaler caused by
inhalation of a user through the opening, return elements for
deactivating the canister to close it, characterized in that the return
elements deactivate the canister when the airflow drops below a certain
threshold value.