Multi-stage nasal filter
OwnerFrederick Thomas Stroblinventor
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Abstract
Intra-nasal filter devices and methods for their manufacture and use are disclosed. An intra-nasal filter device includes: a first stage filter proximate the septum; and a second stage filter comprising a flexible material extending upwardly from the first filter stage filter; wherein the flexible material comprises: an impedance in the range of 0.02 to 0.2 cmH2O; an effective cross-sectional area in the range of 0.2 to 2 square inches; and a plurality of radially extending geometric structures disposed along an axial length of the second stage.
Claims15
An intra-nasal filter device for use in a nasal cavity having an internal circumference extending from a proximal region proximate the sinus to a distal region proximate the septum, the device comprising:
- a first filter stage to be positioned proximate the septum;
- and
- a second stage comprising a filter material extending proximally from the first filter stage;
- wherein the filter material as incorporated into the second stage exhibits an impedance in the range of 0.02 to 0.2 cmH2O, and aggregate surface area in the range of 0.5 to 2 square inches;
- and
- wherein the second filter stage comprises longitudinal ribs twisted to form a closed tapered helical structure.
An intra-nasal filter device comprising:
- a first stage filter proximate the septum;
- and
- a second stage filter comprising a flexible material extending upwardly from the first filter stage filter;
- wherein the second stage filter comprises longitudinal ribs twisted to form a closed tapered helical structure and has:
- an impedance value, as incorporated into the second stage filter, in the range of 0.02 to 0.2 cmH2O;
- an aggregate surface area in the range of 0.5 to 2 square inches.
Dependencies are inferred from the claim text.