Metered dose inhalers，MDI
A metered-dose inhaler (MDI) is a device that delivers a specific amount of medication to the lungs in the form of a short burst of aerosolized medicine. It is usually self-administered by the patient via inhalation. It is the most commonly used delivery system for treating asthma, chronic obstructive pulmonary disease (COPD), and other respiratory diseases. The medication in a metered dose inhaler is most commonly a bronchodilator, corticosteroid, or a combination of both for the treatment of asthma and COPD.