Medical face mask

Abstract

Apparatus for delivering gas to a user. The apparatus comprises a patient interface configured to surround the user's mouth and nose. The apparatus also comprises an outer chamber configured to receive gas from an external supply, wherein the outer chamber is secured to a patient facing side of the patient interface and comprises one or more vents, wherein the one or more vents are configured to be closed when the apparatus is secured on the user. The apparatus further comprises a reservoir in fluid communication with the outer chamber; a connector configured to receive gas flow from the outer chamber, the connector comprising one or more openings to allow an exchange of gas between the connector and the reservoir; an inner chamber in fluid communication with the user's airway; one or more inspiratory valves configured to allow gas to flow from the reservoir into the inner chamber when the gas pressure in the reservoir is higher than the gas pressure in the inner chamber; and an expiratory valve configured to allow gas to flow out of the apparatus when the gas pressure in the inner chamber exceeds the ambient pressure.

Dependencies are inferred from the claim text.