Humidifier system

• US 5,916,493 A
• Filed: 08/12/1997
• Issued: 06/29/1999
• Est. Priority Date: 08/12/1997
• Status: Expired due to Term

• Current Assignee: Smiths Medical ASD, Inc. (Smiths Group International Holdings Ltd.)
• Original Assignee: Pegasus Research Corporation
• Inventors: Miller, Kenneth G.
• Primary Examiner(s): BUSHEY, CHARLES S
• Application Number:
  US08/909,537
• Time in Patent Office: 686 Days
• Field of Search: 261/99, 261/104, 261/107, 261/131, 261/154, 261/DIG. 4, 261/DIG. 34, 128/203.12, 128/203.13, 128/203.14, 128/204.13, 128/204.14, 128/204.17
• US Class Current: 261/154
• CPC Class Codes: A61M 16/1075 by influencing the temperature A61M16/1045 takes precedence
• CPC Class Codes: A61M 16/109 the humidifying liquid or the beneficial agent
• CPC Class Codes: A61M 16/147 the respiratory gas not passing through the liquid container
• CPC Class Codes: A61M 16/16 Devices to humidify the respiration air A61M16/1045 takes precedence
• CPC Class Codes: A61M 16/162 Water-reservoir filling system, e.g. automatic
• CPC Class Codes: B01F 23/12 with vaporisation of a liquid disinfection, sterilisation or deodorisation of air A61L9/00
• CPC Class Codes: F24F 6/10 heated electrically
• CPC Class Codes: Y10S 261/34 Automatic humidity regulation

Abstract

A humidifier system for producing a humidified and heated breathing gas including a humidifier module having a humidifying chamber with a supply gas inlet, a breathing gas outlet and a heat transfer element. A tube extending between a liquid reservoir and the humidifier module includes therein an elongate liquid absorbing wick whose upper end has a plurality of leaves extending planarly and radially outwardly therefrom into the humidifying chamber into contact with said heat transfer element. Liquid is transported by the wick upwardly into the leaves thereof where it is evaporated and mixed with the supply gas in the humidifying chamber to generate a heated and humidified breathing gas. A vent passage between the humidifying chamber and the liquid reservoir allows the automatic adjustment of the pressure in the reservoir and thus the capillary flow of liquid up the wick in response to a change in the volumetric rate of supply gas so as to provide a humidifier system where the heat and humidity level of the breathing gas are self-regulated.

Claims

1. A humidifier assembly for use in a humidifier system including a liquid reservoir, the humidifier assembly comprising:

a humidifier module connectable to a gas supply, a breathing apparatus and the liquid reservoir, said humidifier module defining a humidifying chamber including a gas supply inlet port and a breathing gas outlet port, said humidifier module further including a heat transfer element in communication with said humidifying chamber; and

a liquid transport conduit extending between the liquid reservoir and said humidifier module for transporting the liquid from said liquid reservoir to said humidifier module, said liquid transport conduit extending radially outwardly into contact with said heat transfer element for evaporating the liquid and generating a heated and humidified breathing gas.

2. The humidifier assembly of claim 1 wherein said liquid transport conduit comprises an elongate liquid absorbing member having one end extending into the liquid in said reservoir and an opposite end contacting said heat transfer element.

10. The humidifying assembly of claim 1 wherein said liquid transport conduit comprises an elongate liquid absorbing member having one end in said liquid reservoir and an opposite end in contact with said heat transfer element, said liquid absorbing member further including a central aperture extending longitudinally therethrough and defining a vent passage between said humidifying chamber and said liquid reservoir.

3. A humidifier assembly for use in a humidifier system including a liquid reservoir, the humidifier assembly comprising:

a humidifier module connectable to a gas supply a breathing apparatus and the liquid reservoir, said humidifier module defining a humidifying chamber including a gas supply inlet port and a breathing gas outlet port, said humidifier module further including an annular heat transfer element in communication with said humidifying chamber; and

a liquid transport conduit extending between the liquid reservoir and said humidifier module for transporting the liquid from said liquid reservoir to said humidifier module, said liquid transport conduit comprising a liquid absorbing member having opposite ends, one of the ends extending into the liquid reservoir and the other end including a plurality of planar leaves in contact with said heat transfer element for evaporating the liquid and generating a heated and humidified breathing gas.

4. The humidifier assembly of claim 3 wherein said humidifier module includes a neck depending therefrom having therein an inwardly coverging chute in communication with said humidifying chamber, said liquid transport conduit extending through an elongate tube, said tube including an upper flared end seated on said chute and a lower end extending into the liquid reservoir, said end of said liquid absorbing member extending into the liquid reservoir being generally flush with the lower end of said tube and said other end of said liquid absorbing member including said plurality of leaves extending planarly and radially outwardly from the upper flared end of said tube into contact with said heat transfer element.

5. The humidifier assembly of claim 4 wherein the upper flared end of said tube includes a plurality of ridges defining a plurality of openings defining a vent passage between said humidifying chamber and said liquid reservoir.

6. The humidifier assembly of claim 4 wherein the upper flared end of said tube is scalloped so as to define a plurality of defining a vent passage between said humidifying chamber and said liquid reservoir.

7. A humidifier assembly for use in a humidifier system including a liquid reservoir, the humidifier assembly comprising:

a humidifier module connectable to a gas supply, a breathing apparatus and the liquid reservoir, said humidifier module defining a humidifying chamber including a gas supply inlet port and a breathing gas outlet port, said humidifier module further including a heat transfer element in communication with said humidifying chamber; and

a liquid conduit extending between the liquid reservoir and said humidifier module for transporting the liquid from said liquid reservoir to said humidifier module, said liquid transport conduit comprising a liquid absorbing member having opposite ends, one of the ends extending into the liquid reservoir and the opposite end including a plurality of planar strips in contact with said heat transfer element for evaporating the liquid and generating a heated and humidified breathing gas, said humidifying chamber further including a plate therein spaced from said heat transfer element, said planar strips of said liquid absorbing member being disposed between said plate and said heat transfer element.

8. A humidifier assembly for use in a humidifier system including a liquid reservoir, the humidifier assembly comprising:

a humidifier module connectable to a gas supply, a breathing apparatus and the liquid reservoir, said humidifier module defining a humidifying chamber including a gas supply inlet port and a breathing gas outlet port, said humidifier module further including a heat transfer element in communication with said humidifying chamber; and

a liquid transport conduit extending between the liquid reservoir and said humidifier module for transporting the liquid from said liquid reservoir to said humidifier module, said liquid transport conduit comprising an elongate rolled sheet of cotton material, said rolled sheet having one end in said liquid reservoir and an opposite end including a plurality of diametrically opposed sheet strips extending planarly and radially outwardly therefrom and in contact with said heat transfer element for evaporating the liquid and generating a heated and humidified breathing gas.

9. A humidifier assembly for use in a humidifier system including a liquid reservoir, the humidifier assembly comprising:

a humidifier module connectable to a gas supply, a breathing apparatus and the liquid reservoir, said humidifier module defining a humidifying chamber including a gas supply inlet port and a breathing gas outlet port, said humidifier module further including a heat transfer element in communication with said humidifying chamber; and

a liquid transport conduit extending between the liquid reservoir and said humidifier module for transporting the liquid from said liquid reservoir to said humidifier module, said liquid transport conduit comprising a plurality of elongate liquid absorbing strips twisted together to define a wick, one end of the wick extending into said liquid reservoir and the opposite end including a plurality of leaves defined by said plurality of strips in contact with said heat transfer element for evaporating the liquid and generating a heated and humidified breathing gas.

11. A humidifier assembly for use in a humidifier system including a liquid supply bottle and a heater module, the humidifier assembly comprising:

a humidifier module including a humidifying chamber having a supply gas inlet, a breathing gas outlet, and an annular heat transfer element in communication with said humidifying chamber and the heater module;

an elongate liquid absorbing wick having one end extending into the liquid supply bottle and an opposite end extending into said humidifying chamber and including a plurality of planar and radially outwardly extending leaves in contact with said heat transfer element;

whereby the liquid absorbed in said leaves of said wick is evaporated therefrom for humidifying the gas supply in said humidifying chamber and generating a heated and humidified breathing gas.

12. The humidifier assembly of claim 11 further comprising a planar plate in said humidifying chamber for holding said planar leaves of said wick against said heat transfer element.

13. The humidifying assembly of claim 11 wherein said humidifier module includes a top wall and a plate assembly therein for holding said leaves against said heat transfer element, said plate assembly including a tube extending inwardly from said top wall of said humidifier module into said humidifying chamber and a planar and annular plate extending radially outwardly from the lower periphery of said tube, said plate being spaced from and parallel to said heat transfer element, said leaves of said wick being disposed between and in contact with said plate and said heat transfer element.

14. The humidifying assembly of claim 11 further comprising a spring in said humidifying chamber for holding said leaves of said wick against said heat transfer element.

15. The humidifying assembly of claim 11 wherein said humidifier module includes a top wall and a plurality of springs in said humidifying chamber for holding said leaves of said wick against said heat transfer element, each of said springs including one end abutting said top wall of said humidifier module and a opposite end holding each of said leaves respectively of said wick in contact with said heat transfer element.

16. A humidifier system for a breathing apparatus comprising:

a humidifier module including a humidifying chamber having a supply gas inlet and a breathing gas outlet, an annular heat transfer element, and a concentric neck depending therefrom and having therein an inwardly converging chute in communication with said humidifying chamber;

a liquid reservoir in communication with said humidifier module;

a heater module in communication with said heat transfer element; and

a tube extending between said liquid reservoir and said humidifier module through said heater module and said neck, said tube including therein an elongate liquid absorbing member and a flared upper end seated over said chute in said neck, said flared end of said tube including ridges therein defining a vent passage in said neck between said humidifying chamber and said liquid reservoir, said liquid absorbing member including an upper end with a plurality of strips extending planarly and radially outwardly therefrom into contact with said heat transfer element;

whereby the liquid absorbed in said strips of said liquid absorbing member is evaporated therefrom for humidifying the gas supply in said humidifying chamber and generating a heated and humidified breathing gas.

17. The humidifying system of claim 16 wherein said liquid absorbing member comprises a plurality of longitudinally twisted elongate strips of absorbent material.

18. The humidifying system of claim 16 wherein said liquid absorbing member comprises an elongate rolled sheet of absorbent material.