What we usually call 1 liter, 2 liter, 3 liter or 5 liter oxygen concentrator refers to the nominal flow rate of the oxygen concentrator. Speaking of this, someone may ask: "If a 1-liter oxygen generator can produce oxygen with a concentration of more than 90%, does it mean that the effect is the same as that of a 3-liter or a 5-liter machine? Because it is all sucked in. More than 90% oxygen?"

In fact, this is not the case. The output oxygen concentration of the oxygen concentrator is not equal to the actual inhaled oxygen concentration. This is not difficult to understand, because whether you use a nasal oxygen tube or an oxygen mask, air is mixed in during inhalation, and then enters our respiratory tract. After the alveoli interact, the actual inhaled oxygen concentration is lower than the output of the oxygen concentrator. Of the oxygen concentration.

In other words, even if the output gas of the 5l oxygen concentrator is 100% oxygen concentration, the lung concentration of the 1L oxygen concentrator has just reached 25%. But in fact, the oxygen concentration output of the oxygen generator is less than 100%. Therefore, the oxygen concentration is less than 25%, which is of no therapeutic value.

When inhaling 1 liter of oxygen with a concentration of 90%, the inhaled oxygen concentration is less than 25%. The 1-liter oxygen concentrator is only suitable for health care, and cannot treat hypoxic diseases. It is only suitable for non-iatrogenic oxygen supplements for sub-healthy people, students, pregnant women and other people.

For patients with respiratory diseases, choosing a 5l oxygen concentrator should buy a medical oxygen concentrator of 3 liters or more with a medical device registration certificate approved by the National Food and Drug Administration.

The 3 liter oxygen generator is mainly suitable for pregnant women with mild respiratory diseases, mild cardiovascular and cerebrovascular diseases, mild fetal hypoxia, and third-high people.

5l oxygen concentrator is mainly suitable for patients with moderate and severe diseases who often have hypoxia, and those who have emergency requirements for sudden acute attacks, and need 10 to 24 hours of oxygen a day: chronic obstructive pulmonary disease (COPD), chronic bronchitis (Old chronic bronchitis), chronic heart failure, pulmonary heart disease, emphysema, pneumoconiosis, pulmonary fibrosis, etc.