Patent ID: 7077133

Claim:
An oxygen enriching apparatus which enriches oxygen contained in air to thereby obtain oxygen-enriched gas, and which supplies the oxygen-enriched gas to a user having a breathing cycle including an inhalation period and an exhalation period synchronously with inhalation of the user by means of a breath synchronization function, which comprises: an oxygen outlet for supplying the oxygen-enriched gas to an inhalator of the user, and a breath detection port provided separately from the oxygen outlet and connected to the inhalator for detecting the user's state of breathing; a sensor for detecting the user's state of breathing disposed on a flow passage reaching the breath detection port;and a main passage extending to the oxygen outlet and adapted to supply the oxygen-enriched gas thereto, said main passage comprising a control member for adjusting the opening of the main passage, and a bypass flow passage for bypassing the control member.