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A description is given of an endonasal filter including two essentially planar filtering components joined at their respective ends by a flexible element mounted, similar to a spring, across the cartilage between the two nostrils. The shape of the filtering components is that of a lunette as is the

A description is given of an endonasal filter including two essentially planar filtering components joined at their respective ends by a flexible element mounted, similar to a spring, across the cartilage between the two nostrils. The shape of the filtering components is that of a lunette as is the shape of the section at entry to the channel communicating with the nasal cavities. The filtering components are joined by a thin piece of plastic shaped to form a U-bend, the two parallel sides of which extend towards the filtering components on whose surfaces they assume the form of an oval that supports the component and to which it is made to adhere by application of heat.

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1. An endonasal filtering device for air from the environment, consisting essentially of: two filtering components (1, 2), joined to a flexible U-shaped connection (3) with two shanks (5, 6) that extends across the piece of cartilage between the two nostrils, as a spring, wherein,said filtering comp

1. An endonasal filtering device for air from the environment, consisting essentially of: two filtering components (1, 2), joined to a flexible U-shaped connection (3) with two shanks (5, 6) that extends across the piece of cartilage between the two nostrils, as a spring, wherein,said filtering components (1, 2) are essentially flat components, lunette-shaped corresponding to the lumen of the channel giving access to the nasal cavities, andsaid U-shaped flexible connection (3) comprises, at each end of the shank, joining means (7, 8, 9, 10) permanently fixed to the respective filtering component (1, 2), wherein,a surface area of each filtering component (1, 2) for intercepting incoming air is greater than the area of the section at entry to the endonasal channel, so as to be partially bent inwards along the edge and fit closely against the wall of the lumen of said channel, andthe thickness of the flat filtering components (1, 2) is less than the thickness of the flexible connection (3). 2. The endonasal device as in claim 1, wherein, said shanks (5, 6) are substantially perpendicular to the surface of the corresponding flat filtering component (1, 2), andsaid joining means (7, 8, 9, 10) lie on the plane of said filtering flat components (1, 2). 3. The endonasal device as in claim 1, wherein, said joining means (7, 8, 9, 10) consist of the ends of said shanks (5, 6) curved to form a roughly oval-shaped support adhering to the surface of the filtering flat components(1, 2). 4. The endonasal device as in claim 1, wherein said joining means (7, 8, 9, 10) consist of the ends of said shanks (5, 6) flattened to form two disks (9, 10) adhering to the surface of the filtering flat components(1, 2). 5. The endonasal device as in claim 1, wherein said flexible connection (3) is made of plastic material. 6. The endonasal device as in claim 1, wherein said flexible connection (3) is made of steel wire. 7. An endonasal filtering device for air from the environment, consisting essentially of: a flexible U-shaped connection (3) with two shanks (5, 6) configured to extend across the piece of cartilage between two nostrils; andtwo filtering components (1, 2) joined to the flexible U-shaped connection (3) with two shanks (5, 6), wherein,said filtering components (1, 2) are essentially flat components and are lunette-shaped corresponding to a lumen of a channel giving access to nasal cavities, andsaid U-shaped flexible connection (3) comprises, at an end of each shank, joining means (7, 8, 9, 10) permanently fixed to the respective filtering component (1, 2), wherein, a surface area of each filtering component (1, 2) for intercepting incoming air is greater than the area of the section at entry to the endonasal channel, so as to be partially bent inwards along the edge and fit closely against the wall of the lumen of said channel, and the thickness of the flat filtering components (1, 2) is less than the thickness of the flexible connection (3).