Passive humidifier for positive airway pressure devices

• US 5,598,837 A
• Filed: 06/06/1995
• Issued: 02/04/1997
• Est. Priority Date: 06/06/1995
• Status: Expired due to Term

• Current Assignee: RIC INVESTMENTS LLC (Respironics Incorporated)
• Original Assignee: Respironics Incorporated
• Inventors: Smith, Iain S. R., Sirianne, Raymond A. Jr.
• Primary Examiner(s): Millin, V.
• Assistant Examiner(s): RACITI, ERIC
• Application Number:
  US08/467,017
• Time in Patent Office: 609 Days
• Field of Search: 128/203.12, 128/204.13, 128/204.14, 128/200.11, 128/200.24, 261/119.1, 261/DIG. 4, 261/DIG. 15, 261/DIG. 34, 261/DIG. 65, 237/78 R, 236/44 R, 55/244, 55/249
• US Class Current: 128/204.14
• CPC Class Codes: A61M 16/16 Devices to humidify the respiration air A61M16/1045 takes precedence
• CPC Class Codes: A61M 2205/42 Reducing noise

Abstract

A passive humidifier for use with positive airway pressure devices including a chamber having an inlet and an outlet for holding a supply of water. Pressurized air is forced over a series of baffles arrayed within parallel channels inside the chamber for creating localized turbulence at the free water surface to maximize humidification efficiency. An accumulation chamber in communication with the outlet reduces the likelihood of water droplets escaping from the outlet.

Claims

1. A humidifier for adding moisture to an air flow comprising:

a body formed from a top wall, a substantially upright sidewall and a bottom wall for holding a supply of water having a free water surface;

an air inlet for supplying an air flow to the body;

an air outlet through which moisturized air is discharged from said body;

a plurality of parallel channel members extending from said top wall for forming a plurality of parallel longitudinal channels,

at least one row of spaced apart baffles extending from said bottom wall towards said top wall, said at least one row of spaced apart baffles extending in a direction substantially transverse to said plurality of channel members, wherein the air flow passes through the plurality of channels over the baffles to create localized turbulence at the free water surface so as to promote moisturization of air flow; and

an outlet chamber formed from a raised portion of said top wall, said chamber extending transversely to said plurality of channels and having a first portion open to at least two of said longitudinal channels and a second portion in communication with said outlet.

2. The humidifier of claim 1 wherein the outlet chamber is substantially U-shaped.

3. The humidifier of claim 1, wherein the outlet chamber is acoustically tuned to resonate in the frequency range which is known to be associated with upper airway obstructions.