Technology is changing and advancing all the time, and that goes for medical technology, as well. Oxygen concentrators are high tech electronics, and if someone can make a call on a very tiny cell phone to someone on the other side of the planet, then you can pretty much expect the same from oxygen concentrator technology.
Just like with computers and cellular devices, oxygen concentrators are managing to get smaller and smaller, and still be able to deliver medical grade oxygen. These sophisticated pieces of medical equipment have the ability to bring in the air around them, and filter it to a very high purity of oxygen.
This takes a powerful inner system, complete with at least 2 different filters, one of which uses its own safe chemically powered absorbancy to separate the oxygen from the rest of the air. The air around us at any given moment is a little over 78% nitrogen and around 21% oxygen. The 1% leftover is composed of a bunch of other gases in tiny, trace amounts. These machines not only filter our pollution and tiny debris particles, like dust and smog, but they separate the gas molecules.
When purchasing a small and innovative stationary oxygen concentrator, it's important to pay attention to the dosage settings. Sometimes, smaller stationary oxygen concentrators aren't able to put out as much oxygen as the older and bigger versions. Many of the newer ones are smaller and able to deliver as much, or almost as much, but the most important thing about buying an oxygen concentrator, is to make sure it will give you the oxygen dose you need.
All stationary oxygen concentrators have a few things in common, that essentially classify them as stationary – they run on AC current only, and they feature only continuous flow oxygen. Their portable cousins can run on both AC and DC power, which can be used to charge the batteries, or they can run only on AC power. Their ability to run on batteries is what makes them portable, and they usually feature lower dosage settings.
One of the most recent innovations in stationary oxygen concentrators, is the Respirionics SimplyFlo. It's the size and weight of a mid-sized portable oxygen concentrator, but it's a stationary model, because it only runs on AC power and requires no batteries. This stationary concentrator is perfect for those who need no more than 2 LPM (liters per minute) of continuous flow oxygen, and who only need to use oxygen therapy for an hour or two during the day, or during the night, when you won't need to be going out and about.
This amazingly small stationary oxygen concentrator was preceded by the Respirionics EverFlo, which is also a very lightweight and small stationary oxygen concentrator. It can deliver up to 5 LPM (0.5 to 5 LPM in 0.5 increments) of continuous flow, and is only 31 lbs and less than 2 feet tall. It's so small that you can roll it under a desk or table when not in use.