Patent ID: 7156098

Claim:
A breathing air filtration device, including: a concave-convex first filtering medium having a first rim at a proximal end thereof and defining a first opening surrounded by the first rim; a concave-convex second filtering medium having a second rim at a proximal end thereof and defining a second opening surrounded by the second rim; a support structure including a first base member coupled integrally with respect to the first rim to support the first filtering medium, a second base member coupled integrally to the second rim to support the second filtering medium, and a connecting member coupled integrally to the first base member and the second base member and extended between the first and second base members; and a first open frame extending distally from the first base member, and a second open frame extending distally from the second base member; wherein the base members of the support structure are positionable at the nasal cavity entrances, with the connecting member spanning the septum, to place each of the first and second filtering media in a working position in which the filtering medium projects distally into an associated one of the nasal cavities, whereby air entering each nasal cavity passes through the associated one of the first and second openings, and further passes through the associated one of the first and second filtering media, and wherein each of the open frames is disposed between its associated filtering medium and associated nasal wall when the associated filtering medium is in the working position.