Patent ID: 6837244

Claim:
An oxygen enriching apparatus which enriches oxygen contained in the air to thereby obtain oxygen-enriched gas, and which supplies the oxygen-enriched gas to a user synchronously with inhalation of the user by means of a breath synchronizing function, which comprises: means for supplying the oxygen-enriched gas at a first flow rate of up to 4 liters/min equal to or less than a continuous base flow rate when a breath-synchronized operation is not performed, wherein the continuous base flow rate is a flow rate at which the oxygen enriching apparatus can supply the oxygen-enriched gas continuously; and means for supplying the oxygen-enriched gas at a second flow rate of 5 to 7 liters/min greater than the continuous base flow rate over an inhalation period having a length 25 to 40% that of a breathing cycle of the user when a breath-synchronized operation is performed.