Guo * *, who was treated in a tertiary hospital in Shaanxi, was in a coma due to chronic obstructive pulmonary disease (COPD), with a large amount of sputum and gas aspiration, and a blood oxygen level of 94. Using the Runkai Medical non-invasive expectoration machine for expectoration treatment, the patient began to have sputum discharge after the second cycle, with a total of 5 cycles and blood oxygen rising to 96; The expectorant machine has a good sputum removal effect and helps to improve the patient's blood oxygen level. The medical teacher fully affirmed the effectiveness of the expectorant machine.