An oxygen concentrator is an electrical appliance which is utilized to provide oxygen for oxygen therapy at considerably bigger concentrations than those of normal air to an affected individual.

Oxygen concentrators are utilized as an alternative to cylinders of pressurized oxygen or liquid oxygen. They are able to deliver a uninterrupted supply of oxygen and also the simplest types are based on two cylinders. These tanks are filled with a zeolite material which absorbs the nitrogen from the air.

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In current times a number of manufacturers have built portable oxygen concentrators. These generally deliver a smaller quantity of oxygen and can also use demand flow, or pulse flow, which means that oxygen is only supplied when the affected individual is inhaling.

As the name suggests, patients can walk close to with these devices as they are little and just need a normal electrical socket to plug into.