Both ventilators and oxygen concentrators can provide extra oxygen to patients, but the difference between the two is: First, the way they work is different. Oxygen concentrators lift oxygen from the air through an air compressor and then supply it to the patient, mostly using a nasal plug tube. Ventilators belong to the category of assisted breathing, far beyond the single function of providing oxygen, requiring the use of a mask or nasal mask. Second, the use of different. Oxygen concentrators are generally used for patients with mild respiratory failure, or home oxygen therapy for chronic obstructive pulmonary disease, and other situations where oxygen is simply needed, such as post-stroke patients, pregnant women, etc. Ventilators can be used to treat various respiratory failures through various assisted breathing modes, and can be used for both mild patients, but mainly for critical illnesses with respiratory dysfunction. Third, the cost is different. Oxygen concentrators generally range from several hundred to several thousand dollars, mostly for home use. Ventilator belongs to the treatment program or family investment, tens of thousands of dollars to tens of thousands of dollars.