RESPIRATORY MASK (VERSIONS) Russian patent published in 2017 - IPC A62B18/10 

FIELD: personal demand items.

SUBSTANCE: respiratory mask contains a mask body that forms an air-breathing zone for the user and a shut-off valve. The body comprises two or more inlet channels configured to receive two or more components in the form of air sources suitable for breathing. The shut-off valve is configured to switch between the closed position and the open position. In the closed position, the shut-off valve prevents fluid communication between one or more inlet channels and an air-breathing zone. The shut-off valve returns to the open position in the absence of the applied force. The inlet channels are in fluid communication with the single inlet component to provide fluid communication comprising an inspiratory channel that provides fluid communication between the inlet channels and the air-breathing zone.

EFFECT: sufficient mask seal to prevent unfiltered air from entering the mask.

23 cl, 5 dwg