Surgery – Respiratory method or device – Means for removing substance from respiratory gas
Reexamination Certificate
2011-04-05
2011-04-05
Douglas, Steven O (Department: 3771)
Surgery
Respiratory method or device
Means for removing substance from respiratory gas
C128S205270, C128S205290, C128S207180
Reexamination Certificate
active
07918225
ABSTRACT:
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.
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Dolezal David M.
Gelfman Daniel M.
Wilder John D.
AirWave, Inc.
Dorsey & Whitney LLP
Douglas Steven O
Ostrup Clinton
Witzany Nathan J.
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