| 摘要 |
An inhaler for producing an inhalable aerosol of a powdered medicament includes an aerosolising device in the form of a vortex chamber 1. The vortex chamber 1 has a curved wall 12, a tangential inlet port 3 and an axial exit port 2. The radius R of the vortex chamber 1 decreases with angular extent r from the inlet port 3. The vortex chamber 1 may include a ramp 20 which reduces the height of the chamber with angular extent r . The reduction in effective cross-sectional area of the vortex chamber accelerates the gas flow between the inlet 3 and the outlet 2 to reduce deposition of the medicament.
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