A 60 year old male patient with cerebral infarction in the ICU of a tertiary hospital in Heilongjiang province is unconscious and lacks the ability to cough up phlegm independently, resulting in excessive phlegm. Before using the Runkai Medical non-invasive sputum suction machine, the patient had just finished suctioning phlegm. During the first cycle of use, there was a clear cough reflex and a large amount of sputum was suctioned out; The second cycle also had sputum aspiration, followed by a decrease in sputum. Finally, another cycle was performed to help prevent lung distension and atelectasis. The patient's family was very satisfied with the effectiveness of the equipment.