It is a condition where the alveoli are deflated, as distinct from pulmonary consolidation. It is a very common finding in chest x-rays and other radiological studies. It may be caused by normal exhalation or by several medical conditions. Although frequently described as a collapse of lung tissue, atelectasis is not synonymous with a pneumothorax, which is a more specific condition that features atelectasis.
There are two types of portable oxygen concentrators available on the market today: Continuous flow oxygen concentrators and pulse dose, or intermittent flow, oxygen concentrators. These two types of oxygen systems have very different benefits and limitations and each is best suited for a specific type of patient.
Pranav Kaistha, co-founder OxygenTimes.com. Views. In simple words, Portable Oxygen Concentrator (POC) is a medical equipment which works on rechargeable battery & provides 90-95% pure Oxygen via nasal cannula; and as Ahmed Sayed Al-Fatah correctly said, it uses Molecular sieve to separate Oxygen from air. POCs can be carried on shoulder, back or movable cart.