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.
Battery â 1 Year. Below is a side by side comparison chart of the top portable oxygen concentrators that users can carry or wear and offer higher dosages of oxygen. The models below represent the smallest, lightest portable oxygen concentrators available on the market that offer higher oxygen liter flow from 1 to over 4 liters per minute. Portable Oxygen Concentrator Comparison of the smallest portable oxygen machines weighing under 10 pounds. Portable Oxygen Concentrators.