| 摘要 |
<p>A dry powder inhaler (10) includes a housing (50), a dosing cartridge (12), and a spacer (42). Within the housing are a source of pressurized gas (34), a pressure gauge, a metered valve (26) controlled by a trigger (36), a safety valve, and an electrostatic charger (40) also controlled by the trigger. The dosing cartridge contains individual doses in airtight cells (14) with one or more openings (16, 18), each covered by an airtight cover sheet. The system uses gas pressure or a penetration device to rupture one of the airtight cells, suspending the powder and directing it to a spacer for subsequent inhalation. The electrostatic charger discharges on the spacer, establishing an electrostatic charge thereon. The spacer includes a non-stick lining. The housing is designed so that it can retract into the spacer.</p> |
