There are two types of oxygen generators available in the market: health care oxygen generator that is mainly used for health care and cannot play the effect of oxygen therapy; medical oxygen generator that requires meeting the relevant national standards and therefore can meet the oxygen therapy needs of some patients.

According to the General Specification for Medical Oxygen Generator with Molecular Sieve, oxygen is produced by the molecular sieve variable pressure adsorption process using air as raw material. The oxygen concentration of the oxygen produced is 90%~96% (V/V), and the remaining components are mainly argon and nitrogen.

The liter of oxygen generator refers to the volume of 90% oxygen concentration gas produced per minute. For example, a 5L oxygen generator can produce 5L of 90% oxygen concentration gas per minute, and if you have to output more than this volume of gas, it will lead to insufficient oxygen concentration.

However, although the oxygen concentration of the output gas is 90%, you will also inhale part of the normal air with an oxygen concentration of 20.8% when actually inhaling oxygen. Therefore, the actual inhaled oxygen concentration may only be about 30%. According to the standard of continuous 1~2L/min oxygen flow rate for patients with chronic obstructive pulmonary disease, the actual inhaled oxygen concentration of long-term home oxygen therapy for chronic obstructive pulmonary disease is about 25%~29%.

If you are looking for more precise and efficient oxygen therapy, high-flow nasal cannula (HFNC) therapy is a perfect choice.

HFNC is currently the most complete and desirable oxygen therapy modality among a variety of medical oxygen generating systems, although this old oxygen therapy method failed to gain clinical application in the early days because it did not effectively solve the problems of wetting and warming. Coupled with its simplicity and convenience, it requires only simple training to use, and thus is increasingly used clinically. But the major problem is that it is expensive and can only be used in hospitals, and there is still a long way to go before it can be widely promoted to families.

HFNC can bring the following two benefits to patients.

1. Precise actual inhalation oxygen concentration. The high-flow respiratory humidification therapy instrument itself will mix the oxygen output from the oxygen generator with air to a set oxygen concentration, and then output it to the patient at a flow rate higher than the peak of human inhalation, avoiding the user to inhale normal air to affect the oxygen concentration, and controlling the actual inhalation oxygen concentration precisely.

2. Improve airway and promote sputum excretion. HFNC provides high-flow air-oxygen mixture with relatively constant temperature and humidity, which conforms to the gas temperature and humidity of the airway in the normal state of the body and improves the function of the airway mucus cilia system.