A 60-year-old cerebral infarction patient in the ICU of a tertiary hospital in Heilongjiang Province was unconscious and had no ability to expectorate autonomously, with excessive sputum. Before using runkai medical noninvasive expectoration machine, the patient had just sucked sputum, and there was obvious cough reflex in the first cycle, and a large amount of sputum was sucked out; In the second cycle, sputum was also aspirated, and the subsequent sputum decreased. Finally, another cycle was carried out to help inflate the lung and prevent atelectasis. The patient's family members were very satisfied with the effect of the equipment.