Mi-e-expectoration machine adopts MI-E (mechanical aspiration-exhalation) technology that is in line with human physiology, which can effectively simulate the natural cough of human body by applying high positive pressure during inhalation and switching to negative pressure instantly during exhalation, and using the difference of positive and negative pressure to generate higher expiratory flow rate in the airway, thus replacing the coughing action or enhancing the coughing effect. Produce an effective cough peak flow rate to bring out the secretions. Especially in the case of excessive sputum that has blocked the respiratory tract, the MI-E sputum expectorator can quickly relieve the patient’s breathing difficulties and avoid further deterioration of the condition.