Humidifier

• US 6,338,473 B1
• Filed: 03/22/2000
• Issued: 01/15/2002
• Est. Priority Date: 06/08/1995
• Status: Expired due to Term

• Current Assignee: Resmed Limited (ResMed Incorporated)
• Original Assignee: Resmed Limited (ResMed Incorporated)
• Inventors: Hebblewhite, Malcolm, Kwok, Philip Rodney, Styles, Robert Edward, Brydon, John William Ernest
• Primary Examiner(s): BUSHEY, CHARLES S
• Application Number:
  US09/532,399
• Time in Patent Office: 664 Days
• Field of Search: 261/119.1
• US Class Current: 261/119.1
• CPC Class Codes: A61M 16/16 Devices to humidify the respiration air A61M16/1045 takes precedence
• CPC Class Codes: F24F 2006/143 using pressurised air for spraying
• CPC Class Codes: F24F 6/02 by evaporation of water in the air

Abstract

A humidifier for producing humidified air, particularly for use with a continuous positive air pressure device. The humidifier has an air inlet and outlet. An elongate passageway extending between the air inlet and the air outlet. The passageway is adapted to be partially filled with water so that air passing along the passageway becomes humidified as it passes over the water from the air inlet to the air outlet.

Claims

1. A low profile humidifier comprising a flow path in a shape selected from the group consisting of a W-shape, a U-shape, and a S-shape, said flow path comprising a plurality of elongate subpassageways and corner portions, each of said subpassageways being substantially straight and being connected end to end by said corner portions, said flow path having at least one U-shaped corner portion, said at least one U-shaped portion having an outwardly directed bulge at an inside side of said U-shaped corner portion.

2. A humidifier as claimed in claim 1, wherein said flow path is a generally W-shape flow path having four subpassageways and three generally U-shaped corner portions, one of said three corner portions is a middle corner portion, said middle corner portion having said bulge.

3. A low profile humidifier comprising a flow path, said flow path comprising a plurality of elongate subpassageways and corner portions, each of said subpassageways being substantially straight and being connected end to end by said corner portions until reaching a last of said subpassageways, said last of subpassageways having a roof portion, said roof portion rising gradually along the length of said last subpassageway in a direction toward an air outlet, which is in communication with said last subpassageway.

4. A low profile humidifier comprising an air inlet, an air outlet, and a flow path therebetween, said flow path having a shape selected from the group consisting of a W-shape, a U-shape, and a S-shape, said flow path comprising a plurality of elongate subpassageways and corner portions, said subpassageways being substantially straight and being connected end to end by said corner portions, said humidifier having a last subpassageway, which is connected to said air outlet, said air outlet being positioned in an end wall of said humidifier and being provided with a tube, said tube having an aperture at a first end, said tube extending along a portion of said last subpassageway and longitudinally aligned with said last subpassageway.

5. A humidifier as claimed in claim 4, wherein said aperture is spaced at least 2 cm away from said end wall.