Oxygen Cylinders and Oxygen Concentrators both deliver oxygen to patients who need it. But the methods of delivery are very different.
Oxygen Cylinders have a finite amount of oxygen compressed within them and inhaled by the user until it runs out. Oxygen Concentrators filter and generate medical grade oxygen, at an infinite supply so long as the battery that powers this mechanism has life.
An oxygen concentrator receives air, purifies it, and then distributes the newly formed air. Air that goes in is made up of about 80% nitrogen and 20% oxygen. Air that comes out contains 90 to 95% pure oxygen and 5 to 10% nitrogen. The nitrogen is separated to give the patient the highest dose of oxygen possible.
Check the image below to know how it works. 🙂