Description： According to the principle of clinical chest physiotherapy, it generates therapeutic forces on the surface of the patient's body that change periodically in a specific direction, specifically for patients suffering from pulmonary ventilation disorders. Not only can it replace manual back percussion to achieve better postural drainage effect, multi-frequency vibration sputum expectorator adopts the mechanical vibration power transmission mode, using its unique vibration function, simulating manual manipulation, percussion, vibration, trembling and squeezing and pushing the way of work, can completely replace manual manipulation, fully realize the purpose of postural drainage of the patient.