| 摘要 |
An inhaler for producing an inhalable aerosol of a powdered medicament comprises a cyclone ( 1 ) with a tangential air inlet ( 3 ) and an axial air outlet ( 4 ). The cyclone ( 1 ) aerosolises and retains an aerosol of powdered medicament in an airflow circulating between the inlet ( 3 ) and the outlet ( 4 ). The cyclone ( 1 ) has an exit port ( 2 ) which is open to atmosphere. When the aerosol is to be inhaled, the pressure in the cyclone ( 1 ) is increased by increasing the airflow to the inlet ( 3 ) which causes the aerosol to discharge through the exit port ( 2 ). The inhaler has the advantage that the rate of discharge of the aerosol can be controlled independently of the rate of airflow required to aerosolise the medicament. |
