Humidifier for CPAP device

• US 5,231,979 A
• Filed: 02/14/1992
• Issued: 08/03/1993
• Est. Priority Date: 02/14/1992
• Status: Expired due to Term

• Current Assignee: Nellcor Puritan Bennett LLC (Medtronic Plc)
• Original Assignee: Puritan Bennett Corp. (Medtronic Plc)
• Inventors: Rose, Fred, Kidd, Lisa, Dolida, Roger
• Primary Examiner(s): Burr, Edgar S.
• Assistant Examiner(s): RACITI, ERIC
• Application Number:
  US07/835,589
• Time in Patent Office: 536 Days
• Field of Search: 128/203.12, 128/204.13, 128/204.14, 128/200.11, 128/200.24, 261/DIG. 4, 261/DIG. 15, 261/DIG. 34, 261/DIG. 65, 237/78, 236/44 R
• US Class Current: 128/204.14
• CPC Class Codes: A61M 16/16 Devices to humidify the respiration air A61M16/1045 takes precedence

Abstract

A humidifier (10) is provided which includes a body (16) defining a plenum (32) for receiving air and a quantity of water therewithin, said body (16) further presenting a tubular inlet (18) and a-tubular outlet (20), and a baffle (34) for directing the flow of air therethrough, said body (16) being integrally formed. A shelf (58) is provided adjacent the outlet (20) for minimizing the effect of waves generated by the flow of circulating air and inhibiting the discharge of water droplets through the outlet (20) which would otherwise be carried by the circulating air. The body (16) is preferably provided with a U-shaped sidewall (55) with the baffle (34) positioned between first and second sidewalls (36, 38) thereof so that the air introduced through the inlet (18) is directed in a U-shaped flow path to enhance humidification before it is exhausted through the outlet (20). The baffle (34) preferably extends between the upper panel (40) and the lower panel ( 42) of the body (16) to provide strength and prevent the collapse of the humidifier body when heavy objects are placed thereon, as well as ballooning of the body (16) caused by internal pressurization.

Claims

1. In a humidifier for creating contact between an incoming air stream and a supply of water in order to produce a humidified air output stream, said humidifier having walls defining an air-water plenum chamber, including a top wall, an opposed bottom wall, and an upright sidewall joining said top and bottom walls, a tubular air input communicating with the chamber, and a tubular humidified air output spaced from said inlet and communicating with said chamber, said chamber being operable for holding a supply of water having a normal depth such that the upper surface of the water is beneath said input and output, the improvement which comprises:

an outlet shelf wall adjacent and beneath said outlet, said outlet shelf wall extending inwardly from said sidewall between said top and bottom walls and presenting an inner margin, said outlet shelf wall being located a distance above said bottom wall which is greater than the normal depth of said water supply; and

an upright outlet ledge wall extending between and interconnecting said outlet shelf wall inner margin and said bottom wall, said outlet ledge wall being in contact with said water supply and oriented for dissipating waves within the water supply.

2. The humidifier of claim 1, said sidewall having a height substantially less than the length and width of said top and bottom walls so that the humidifier assumes a thin, low-profile configuration.

3. The humidifier of claim 1, said walls being formed as an integral composite body.

4. The humidifier of claim 1, including structure defining a baffle wall extending between and interconnecting said top and bottom walls, said baffle wall being located between said inlet and outlet for directing said incoming air stream around the baffle wall towards said outlet.

5. The humidifier of claim 1, including an inlet shelf wall adjacent and beneath said inlet, said inlet shelf wall extending inwardly from said sidewall between said top and bottom walls and presenting an inner margin, said inlet shelf wall being located a distance above said bottom wall which is greater than the normal depth of said water supply, an upright inlet ledge wall extending between and interconnecting said inlet shelf wall inner margin and said bottom wall, said inlet ledge wall being in contact with said water supply and oriented for dissipating waves within the water supply, said inlet and outlet shelf walls, and said inlet and outlet ledge walls, being in laterally spaced relationship to each other.

6. The humidifier of claim 5, said inlet and outlet ledge walls each being arcuate in plan configuration and each being tapered between the corresponding inner margins of said inlet and outlet shelf walls and said bottom wall.