The atomizer is an instrument for atomizing liquid, and the liquid droplets after atomization are all nanoscale. Air humidifier is a kind of atomizer.

Medical atomizers are divided into ultrasonic atomizers, compression atomizers and screen atomizers.

Working principle of ultrasonic atomizer: the liquid medicine is turned into fog by ultrasonic thin plate vibration. Because the fog particles produced by ultrasonic technology vibration are large and dense, which is unfriendly to patients, the ultrasonic atomizer has been eliminated now.

Working principle of compressed atomizer: compressed air makes the liquid medicine form particles on the baffle, and particles with small diameter form fog through the screen. The particles with large diameter return to the liquid medicine.

Working principle of screen atomizer, Aerosol particles with smaller diameters are formed. The diameter of atomized particles generated is concentrated at 3 μ m-7 μ M. Particles with diameter ≤ 5 microns are generally more than 50%, and some brands can reach 60% - 90%. It is mainly used for aerosol therapy of children.

Aerosol inhalation therapy is a commonly used method to treat respiratory system diseases. Using the principle of gas jet, drugs are dispersed into tiny droplets or particles suspended in the gas through a certain atomization device, and deposited in the respiratory tract and lungs through inhalation to achieve the effect of drugs. Like oral drugs, intramuscular drugs, and intravenous drugs, it is a drug delivery method, but compared with other drug delivery methods, Aerosol inhalation therapy has the characteristics of small dosage, fast onset, small systemic side effects and convenient use.