BREATHING AIR FILTRATION DEVICES

摘要

A nasal air filtration device includes a pair of either planar or concave-
convex filters, a support structure incorporating a pair of generally annular
bases or sleeves for supporting the filters, and a bridge that couples the
bases or sleeves to maintain them in a desired spaced~apart relation and to
determine a desired angular relationship. The support structure is insertable
into the nasal cavities to position the filters within corresponding nasal
cavities. Flexible rims maintain the support structure and the filters in
spaced-apart relation to the surrounding nasal wall. The rims conform to
surrounding nasal tissue to form seals. The rims can be selectively inclined
to facilitate insertion and resist accidental removal. In certain embodiments
the device is combined with a filter that covers the mouth to provide an air
filtration system.