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US 2013/0199531 A1Published application
Apparatus for control of oxygen and/or air flow to nasal prongs
AssigneeNeotech Products, Inc.
InventorsRangasamy Ramanathan, Arnold M. Heyman, Thomas R. Thornbury, Craig R. McCrary
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Abstract
An air or oxygen flow supply system between a supply source and nasal prongs applicable to a patient, comprising a succession of flow ducts having different flow areas, there being junctions between successive of the ducts, the flow areas defined by A1, A2 - - - An where n>2, the flow areas decreasing at the junctions, in the direction of the flow.
Claims23
An air or oxygen flow supply system between a supply source and nasal prongs applicable to a patient, comprising
- a) a succession of flow ducts having different flow areas,
- b) there being junctions between successive of said ducts,
- c) said flow areas defined by A1, A2 - - - An where n>2,
- d) flow areas decreasing at junctions, in
- the direction of said flow said flow areas at each junction being a duct outlet and a successive duct inlet, and wherein said outlet and inlet flow areas are proximate one another and substantially different, in size, whereby said inlet and outlet flow areas are free of elongated taper therebetween.
2 more elements
The combination for connection to the 15 mm bore of O2, or air and O2 supply means:
- a) a nasal cannula device having an inlet fitting of external diameter d10 where d10 is not equal to 15 mm,
- b) an adapter having an external diameter d8 equal to 15 mm connected to said supply means bore and an outlet bore of diameter d9 connected to said device,
- c) the flow areas of said adapter and of said device being less than the flow area A8 of said supply means bore and diminishing in the direction toward nasal prongs defined by said nasal cannula device,
- d) there being flow ducts connected end-to-end between said supply means and said prongs, said ducts having successively decreasing and substantially different flow passing areas.
1 more element
Dependencies are inferred from the claim text.