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From the variety of oxygen equipment, offered in our market it is difficult to stay on the model, and buy exactly the oxygen concentrator, which will be the best option for long-term oxygen therapy (oxygen therapy) in the home. However, to the choice of the oxygen concentrator is to go very carefully, as often - a zhiznennoneobhodimy and it is no less important, is not a cheap device. In this article I will try to describe the main differences between the oxygen concentrators from each other and how to pick up oxygen concentrator with oxygen deficiency. Which diseases using oxygen concentrators Currently, oxygen concentrators are becoming more widely used for use in the home, as the devices are relatively compact and easy to use, which allows for oxygen therapy are not in the hospital, and at home. The most common oxygen concentrators used in the following diseases: COPD (chronic obstructive pulmonary disease); bronchial asthma; cystic fibrosis; pulmonary hypertension; heart failure; fetal hypoxia during pregnancy and others. What are the characteristics to consider when choosing an oxygen concentrator to the patient Here are the main parameters that should look for when buying an oxygen concentrator: performance oxygen per minute; noise level; portability; warranty period and price. Performance oxygen per minute The main characteristic of any oxygen concentrator is an oxygen flow per minute, at which the output density is not less than 90%. Proceeding from this, first of all necessarily need to know how often a person needs oxygen. In some cases, oxygen therapy is required for 24 hours, in some cases, the physician recommends oxygen breathing for 30 to 60 minutes a day. Consider both options and you will understand what to focus in the future. If a person with necessary oxygen deficiency oxygen therapy within 24 hours, consider options need oxygen concentrator, which will give at least 5 liters of oxygen per minute with an oxygen concentration at the outlet of at least 80%. Or in other words - a 5-liter oxygen concentrators. Therefore, immediately discard all models, the performance of which is less than 5 liters per minute. As a rule, they are used for the preparation of oxygen cocktails, or for less complex cases. The same characteristics you need to search parameter: the concentration of oxygen at the outlet at a flow of 5 l / min - no less than 90%. For example: Armadillo oxygen concentrator 7F-5L If oxygen therapy must not a long time (several hours per day). Then, most likely, it will be enough oxygen concentrator to an oxygen flow of 3 liters per minute, i.e. in the characteristics necessary to search parameter: the concentration of oxygen in the outlet stream of 3 liters / min - no less than 90%. Or a 3-liter oxygen concentrator. For example: Armadillo oxygen concentrator 7F-3L Noise level If the oxygen concentrator to be used for long-term oxygen therapy, and in most cases need it continuous operation system, special attention should be paid to the noise level, because each extra decibel gains importance because the increased noise for hours creates an unfavorable emotional background and can cause irritation. The human ear perceives a noise level of 20-25 dB, but unfortunately, oxygen concentrators with a level less than 20 dB is not, therefore, considered to be the quietest noise oxygen concentrators 31- 40 dB. Portability So far we have considered the stationary models of oxygen devices that can be used only in the house, and if people want to lead an active life (go out to the store, where a ride), you should pay attention to the model of portable (laptop) hubs oxygen. The portable oxygen concentrator can have less flow of 5 liters per minute in continuous operation up to 5-6 liters per minute in a pulsed mode, so it is also suitable for use by patients. The operating principle of the pulse mode: while the patient exhales, the accumulating device in the internal reservoir