The household oxygen generator produces atmospheric oxygen, not high-pressure oxygen, and will not cause carbon dioxide accumulation and poisoning due to the failure of carbon dioxide to be discharged in time. The oxygen generator does not produce pure oxygen. It is used for home oxygen therapy. Oxygen therapy does not enter the human body with any medicine, but supplements the oxygen needed by the human body. Oxygen inhalation can increase the blood oxygen content and improve the hypoxia state of the human body. There are no side effects in the normal use of household oxygen generators.
So, what is the difference between 3L and 5L oxygen generators?
Below, we will explain in person: ⒈Flow rate range of medical grade oxygen, ⒉Range value of inhaled oxygen concentration, ⒊Main applicable people, ⒋Compatibility with non-invasive ventilators, ⒌Work load that can be withstood, these 5 points to explain in person
Comparison of oxygen flow rate and oxygen concentration of 3 liter and 5 liter machines
. The range of medical grade oxygen flow is different for 3 liters and 5 liters
For 3 liters oxygen concentrator, when the oxygen flow rate is 1~3 liters, the “oxygen concentration” reaches 90%~96%, that is: the oxygen flow per minute of the 3 liters oxygen concentrator, when the user chooses 1 liter per minute , At 2 liters per minute and 3 liters per minute, it can provide oxygen with an oxygen concentration of 90% to 96%. It should be noted that some 3-liter oxygen generators, although the gas volume can be adjusted to 4 liters and 5 liters, but in this case, the oxygen concentration of the machine is no longer 90% to 96%, with the oxygen flow rate With the increase of, the oxygen concentration will decrease, and it will be about 70% at 5 liters.
For a 5-liter oxygen generator, when the oxygen flow rate is 1~5 liters, the “oxygen concentration” reaches 90%~96%, that is: the 5-liter oxygen generator not only includes: the oxygen flow rate per minute is 1 liter, At 2 liters and 3 liters, its oxygen concentration is 90%~96%; at the same time, when choosing 4 liters per minute and 5 liters per minute, it can provide oxygen therapy with an oxygen concentration of 90% to 96%. Oxygen.
2. The FiO2 value range of “inhaled oxygen concentration” for 3 liters and 5 liters is different
What is FiO2? FiO2 is the English abbreviation of Fraction of Inspiration O2. The Chinese interpretation is the fraction of oxygen concentration in the inhaled gas, which is referred to as the inhaled oxygen concentration for short. Commonly used to express the percentage of oxygen involved in gas exchange in the alveoli.
Since: 3 liters oxygen concentrator and 5 liters oxygen concentrator, the range of providing medical oxygen flow is different, so when you use the most common nasal oxygen tube (also known as nasal cannula, nasal suction tube), this device is used for oxygen inhalation At this time, the inhaled oxygen concentration FiO2 is different due to the inhaled oxygen flow.
“Standard Nasal Oxygen Tube” is a low-flow oxygen inhalation device, usually used for oxygen therapy of no more than 6 liters per minute. It is an open oxygen inhalation. The actual oxygen concentration that reaches the lungs is: the oxygen from the oxygen generator is mixed with air The oxygen concentration.
If the most common nasal oxygen tube is used for oxygen inhalation, the formula for the estimated value of inhaled oxygen concentration FiO2 from the oxygen flow rate and oxygen concentration is:
Inhaled oxygen concentration FiO2 estimated value = 21% + 4 × oxygen flow rate per minute (liter) × oxygen concentration of oxygen generator (%)
From the above formula, we can get the corresponding data of the estimated value of the oxygen flow rate and FiO2 (inhaled oxygen concentration) of the 3-liter household oxygen generator:
Oxygen flow rate (l/min) Oxygen concentration (%) Estimated value of FiO2 (using nasal oxygen tube)
1L/min 90% ~ 96% 24.6% ~ 24.84%
2L/min 90% ~ 96% 28.2% ~ 28.68%
3L/min 90% ~ 96% 31.8% ~ 32.52%
Similarly, we can also get the corresponding data of the estimated value of the oxygen flow rate and FiO2 (inhaled oxygen concentration) of the 5-liter household oxygen generator:
Oxygen flow rate (l/min) Oxygen concentration (%) Estimated value of FiO2 (using nasal oxygen tube)
1L/min 90% ~ 96% 24.6% ~ 24.84%
2L/min 90% ~ 96% 28.2% ~ 28.68%
3L/min 90% ~ 96% 31.8% ~ 32.52%
4L/min 90% ~ 96% 35.4% ~ 36.36%
5L/min 90% ~ 96% 39.0% ~ 40.20%
3. the applicable people of 3 liters oxygen concentrator and 5 liters oxygen concentrator are different
1L and 2L oxygen generators are mostly used for health-care oxygen inhalation for people with mild hypoxia, such as pregnant women and white-collar workers with mild hypoxia.
The 3 liter oxygen generator is mostly used for people with mild to moderate respiratory diseases, cardiovascular and cerebrovascular diseases, and three highs.
The 5-liter oxygen generator is mostly used for: patients with severe diseases, people who need to use ventilators, and people who need to inhale oxygen for a long time every day: people with chronic obstructive pulmonary disease, lung fibers, lung resection, lung cancer, pneumoconiosis, silicosis, etc.
4. Compatibility of 3-liter and 5-liter machines to “home non-invasive ventilator” is different
Household non-invasive ventilators are different from non-invasive ventilators used in hospitals. The oxygen source is often provided by an additional oxygen generator, because the mask has a carbon dioxide “storage effect” and the pressure in the mask is relatively large, generally less than 5 liters/ At a minute oxygen flow rate, oxygen cannot enter the mask well, and naturally cannot enter the airway and lungs, and at the same time, it cannot flush out the exhaled carbon dioxide out of the mask.
In addition, due to the large air flow in the mask, the incoming oxygen will be severely diluted. Therefore, if the low-flow oxygen output of a 3-liter oxygen generator is connected to a household non-invasive ventilator, it is often unable to meet the patient’s demand for oxygen, which affects the patient’s therapeutic effect.
Therefore, when patients need to connect a home non-invasive ventilator with an oxygen concentrator, doctors often suggest that they need at least a 5 liter home oxygen concentrator, or a larger flow oxygen concentrator, which is more suitable.
5. The molecular sieve dosage and compressor performance of the 3-liter machine and the 5-liter machine are different, and the work load they can bear is different
Generally speaking, a 5-liter oxygen generator has more molecular sieves filled in it than a 3-liter oxygen generator. At the same time, its power components are also the main cost, and the air compressor in the oxygen generator can withstand the work Load more. It is more suitable for people who need long-term oxygen therapy every day. For example, for people with COPD, they should use a 5-liter oxygen concentrator rather than a 3-liter oxygen concentrator.
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