| 摘要 |
Method and device are proposed, which provide a long-time efficient protection of a human respiratory tract by means of an invisible from outside intranasal working body. By breath-in the working body acts completely as a filter, and by exhalation it acts completely as a valve. This way the valves can be used in the limited volumes of intranasal cavities without reduction of the useful working volume of a filter. The accumulated during the breath-in phase dust is conducted away to outside again during the exhalation phase. Therewith the necessary filter capacity is reduced to one cycle of breath-in and -out. This way a long-term efficient protection of the respiratory ways is attained. Practically suitable installation way of the said working body in the nostrils is also provided.
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