| 摘要 |
An air flow system (10) for detecting target flow rates as a function of an opening (32, 42) in a flow restrictor (18, 20). A negative pressure sensor (50, 52) is triggered in response to a negative pressure condition in a chamber (23, 25) in the flow restrictor (18, 20). Target flow rates are preselected by using a flow restrictor (18, 20) having a particular size restrictor. Triggering of the negative pressure sensor (50, 52) may be used for controlling various medical treatments. A signal generated when a target flow rate is reached may be used for administering aerosols during inhalation, activation of HFCC therapy during exhalation, or to control various other medical treatments. The air flow system (10) allows for selection of a narrow flow rate range for administering aerosols during inhalation to target particular areas in the respiratory tree as major deposition sites for the aerosols. |
