The difference between ventilator and oxygen absorber mainly lies in the different principles, different applicable objects and different costs. 1. Different principles: Ventilator is a device to assist respiratory ventilation, can effectively replace, control or change the patient’s original respiratory rhythm and respiratory depth, increase pulmonary ventilation, improve respiratory function. The principle of the oxygen concentrator is to use air separation technology to improve the oxygen concentration of the patient’s inhalation. 2. Applicable objects are different: Ventilator can be used to treat various patients with respiratory failure through assisted breathing mode, such as patients without voluntary breathing. The oxygen machine is suitable for home oxygen therapy for patients with chronic obstructive pulmonary disease or other hypoxic diseases. 3. Different cost: the cost of ventilator is higher compared to the price of oxygen machine.