Apparatus for humidifying a respiratory gas

• US 7,938,112 B2
• Filed: 05/01/2006
• Issued: 05/10/2011
• Est. Priority Date: 08/05/1999
• Status: Active Grant

• Current Assignee: ResMed Humidification Technologies GmbH (ResMed Incorporated)
• Original Assignee: MAP Medizin-Technologie GMBH (ResMed Incorporated)
• Inventors: Genger, Harald, Madaus, Stefan, Lang, Bernd, Mayer, Wolfgang, Klopp, Adreas, Vogele, Harald, Schatzl, Stefan
• Primary Examiner(s): Thanh; Loan
• Assistant Examiner(s): SKORUPA, VALERIE LYNN
• Application Number:
  US11/414,432
• Publication Number:
  US 20060191531A1
• Time in Patent Office: 1,835 Days
• Field of Search: 128/203.12, 128/203.16, 128/203.17, 128/203.26, 128/203.27, 128/204.14, 222/61, 222/491, 137/44, 137/101.25, 137/393, 137/396, 137/406, 137/453
• US Class Current: 128/203.12
• CPC Class Codes: A61M 16/0057 Pumps therefor
• CPC Class Codes: A61M 16/0066 Blowers or centrifugal pumps
• CPC Class Codes: A61M 16/0816 Joints or connectors
• CPC Class Codes: A61M 16/0858 Pressure sampling ports
• CPC Class Codes: A61M 16/0875 Connecting tubes
• CPC Class Codes: A61M 16/105 Filters A61M16/047, A61M16/22 take precedence; water traps A61M16/08
• CPC Class Codes: A61M 16/107 in the inspiratory path
• CPC Class Codes: A61M 16/109 the humidifying liquid or the beneficial agent
• 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: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2205/42 Reducing noise
• CPC Class Codes: A61M 2209/08 Supports for equipment
• CPC Class Codes: A62B 9/003 Means for influencing the temperature or humidity of the breathing gas

Abstract

Apparatus for humidifying a respiratory gas includes a liquid storage space for storage of a liquid, a humidifying region for loading the respiratory gas with the liquid by the respiratory gas coming into contact in the humidifying region with the liquid, a respiratory gas supply device for supplying the respiratory gas to the humidifying region, a respiratory gas withdrawal device for withdrawal of the humidified respiratory gas from the humidifying region, and a partial-amount discharge device for passing a partial amount of the liquid stored in the liquid storage space into the humidifying region.

Claims

1. Apparatus for humidifying a respiratory gas comprising:

a liquid storage space for storage of a liquid,

a humidifying region for loading the respiratory gas with the liquid by the respiratory gas coming into contact in the humidifying region with the liquid,

a separating wall which separates the humidifying region from the liquid storage space;

a respiratory gas supply device for supplying the respiratory gas to the humidifying region,

a respiratory gas withdrawal device for withdrawal of the humidified respiratory gas from the humidifying region, and

a partial-amount discharge device for passing a partial amount of the liquid stored in the liquid storage space into the humidifying region, wherein the partial-amount discharge device comprises an air conduit that extends from the humidifying region through the separating wall into the liquid storage space and a fluid conduit that extends from the separating wall into the humidifying region.

2. Apparatus as set forth in claim 1 wherein the humidifying region is spatially separated from the liquid storage space.

3. Apparatus as set forth in claim 2 wherein the humidifying region is in communication with the liquid storage space by way of the fluid conduit.

4. Apparatus as set forth in claim 1, wherein the liquid storage space is arranged above the humidifying region in the position of use of the apparatus.

5. Apparatus as set forth in claim 4 wherein the air conduit passes through the separating wall in a vertical direction.

6. Apparatus as set forth in claim 1, wherein the discharge of a partial amount of the liquid into the humidifying region is implemented in dependence on a level of liquid in the humidifying region.

7. Apparatus as set forth in claim 1, wherein air is introduced into the liquid storage space through the air conduit for the discharge of a partial amount of the liquid out of the liquid storage space.

8. Apparatus as set forth in claim 7 wherein the air for introduction into the liquid storage space is drawn in by way of the humidifying region.

9. Apparatus as set forth in claim 7, wherein the air conduit has a first mouth opening which is at the height of the level of liquid in the humidifying region and a second mouth opening which opens in the liquid storage space in a region above the level of liquid in the storage space.

10. Apparatus as set forth in claim 9, wherein the fluid conduit extends from the separating wall into a region below the first mouth opening of the air conduit.

11. Apparatus as set forth in claim 1, wherein the separating wall and the air conduit and the fluid conduit are integral.

12. Apparatus as set forth in claim 1, wherein the liquid storage space is formed by a cup-shaped housing portion.

13. Apparatus as set forth in claim 1, wherein the humidifying region is formed in a trough element.

14. Apparatus as set forth in claim 13 wherein there are provided air conduit devices which are arranged in such a way that air flows through the trough element substantially transversely or along a spiral path.

15. Apparatus as set forth in claim 13, wherein the trough element has a bottom portion which is formed from a material of high thermal conductivity.

16. Apparatus as set forth in claim 15, wherein the bottom portion is formed of metal.

17. Apparatus as set forth in claim 13, wherein an integral member forming the separating wall is fitted in sealing relationship into the trough element by way of a first peripheral sealing device, and that the integral member also has a second peripheral sealing device which closes the liquid storage space in sealing relationship in conjunction with the separating wall.

18. Apparatus as set forth in claim 13, wherein there is provided a support housing for receiving at least the trough element.

19. Apparatus as set forth in claim 18, wherein the trough element or the support housing is provided with a respiration tube connecting device for the connection of a respiration tube.

20. Apparatus as set forth in claim 19 further comprising a secondary tube connecting device provided in the region of the respiration tube connecting device.

21. Apparatus as set forth in claim 20 wherein the secondary tube connecting device and the respiration tube connecting device are formed integrally with the trough element or the support housing.

22. Apparatus as set forth in claim 1, wherein there is provided a heating device for heating the partial amount of liquid stored in the humidifying region.

23. Apparatus as set forth in claim 22 wherein the heating device is operated electrically.

24. Apparatus as set forth in claim 1, wherein the liquid storage space is formed by a housing portion which is coupled to a trough element to form the humidifying region, and that there is provided a support housing for receiving a unit formed by the housing portion and the trough element.

25. Apparatus as set forth in claim 24 wherein the support housing is provided with connecting devices for coupling the support housing directly to a CPAP-unit.

26. An apparatus for supplying a respiratory gas under an increased pressure, comprising:

a CPAP unit; and

a humidifying apparatus according to claim 1.

27. The apparatus according to claim 26, wherein the apparatus is constructed to deliver to the humidifying apparatus gas pressurized in the range of 5-20 mbar.

28. The apparatus according to claim 26, wherein the humidifying apparatus is connectable to the CPAP unit in a modular relationship.

29. An apparatus for CPAP treatment including the humidifying apparatus according to claim 1.

30. The apparatus according to claim 29, wherein the apparatus is constructed to deliver to the humidifying apparatus gas pressurized in the range of 5-20 mbar.