| 摘要 |
Apparatus for delivering drugs to the lungs from an ultrasonic nebulizer by inspiration using a ventilator includes a flow system in which the nebulizer is connected in parallel with the series conduit between the ventilator delivery outlet and the ventilator discharge valve and exhaust outlet. One-way valves in parallel flow conduits to the nebulizer provide for bypassing the nebulizer except when the ventilator is in the inspiration phase of its operation, thereby eliminating an important cause of loss of drugs to the ventilator outlet during the expiration phase. The nebulizer, which can also be used for administration of drugs by inhalation (without a ventilator) has a flow regulator which provides for delivery of the drug from the nebulizer only during part of inspiration (or inhalation in a mouth breathing use) and for delivery of gas (air or oxygen) during the remaining part of inspiration (inhalation). A cone in the cap above the vibrating crystal of an ultrasonic nebulizer and improved inlet and outlet porting in the cap improve the conditions in the aerosol chamber of the nebulizer cap to enhance efficiency of drug delivery and reduce drug losses. |
