Guo * * who was treated in a tertiary hospital in Shaanxi Province, was comatose with COPD, had a large amount of sputum and gas cutting, and had 94% blood oxygen. The non-invasive expectoration machine of runkai medical was used for expectoration treatment. After the second cycle, the patient began to discharge sputum. A total of 5 cycles were carried out, and the blood oxygen increased to 96; The expectoration machine has good expectoration effect, and it also helps to improve the patient's blood oxygen level. The medical teacher fully affirmed the expectoration machine's effect.