FIELD: medicine.
SUBSTANCE: invention refers to face masks comprising a unidirectional lock. The unidirectional locks provide gas transmission between an internal gas space limited by the mask and user, and an external gas space outside of the mask. The unidirectional locks comprise one or more leaves located above an opening formed in a base of the lock. Each of the leaves comprises a free edge and a loop located in whole opposite to the free edge.
EFFECT: invention has smaller liability to damages, greater visibility for the user around the mask and lower possibility of solid ingress through the lock.
15 cl, 14 dwg
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