Humidifiers for respiratory apparatus

1. A humidifier configured to humidify a flow of pressurized respiratory gas, the humidifier comprising:

a tub base configured to retain a body of water;

a tub lid configured to cover the tub base; and

an inlet passage configured to receive the flow of pressurized respiratory gas and deliver the pressurized respiratory gas to an interior of the humidifier, at least a portion of the inlet passage being configured to float on the body of water retained in the tub base.

2. The humidifier of claim 1 , wherein the inlet passage is anchored to a wall of the humidifier at an inlet end, and wherein the inlet passage comprises an open end that is freely movable relative to the inlet end.

3. The humidifier of claim 2 , wherein the inlet passage is configured so that the open end of the inlet passage always stays afloat on the surface of the water in the tub base regardless of the orientation of the humidifier.

4. The humidifier of claim 1 , further comprising an outlet passage configured to discharge the humidified flow of pressurized gas, the outlet passage being configured to float on the body of water retained in the tub base.

5. The humidifier of claim 4 , wherein the outlet passage is anchored to a wall of the humidifier at an outlet end, and wherein the outlet passage comprises an open end that is freely movable relative to the outlet end.

6. The humidifier of claim 5 , wherein the outlet passage is configured so that the open end of the outlet passage always stays afloat on the surface of the water in the tub base regardless of the orientation of the humidifier.

7. The humidifier of claim 1 , wherein at least an open end of the inlet passage is made of buoyant material.

8. The humidifier of claim 7 , wherein the buoyant material is polystyrene foam.

9. The humidifier of claim 1 , wherein the inlet passage is attached to the tub lid.

10. A respiratory apparatus configured to pressurize and humidify a flow of breathable gas for respiratory therapy to a patient, the respiratory apparatus comprising:

a flow generator configured to pressurize the flow of breathable gas to a pressure of 2-30 cm H 2 O; and

the humidifier of claim 1 .

11. A humidifier configured to humidify a flow of pressurized respiratory gas, the humidifier comprising:

a tub base configured to retain a body of water;

a tub lid configured to cover the tub base; and

a flexible inlet passage located inside the humidifier and configured to receive the flow of pressurized respiratory gas,

wherein the flexible inlet passage is configured to be supported by the body of water in the tub base.

12. The humidifier of claim 11 , wherein the inlet passage is anchored to a wall of the humidifier at an inlet end, wherein the inlet passage comprises an open end, and wherein the inlet passage is configured to flex so that the open end remains above the surface of the body of water and water is prevented from entering the open end regardless of the orientation of the humidifier.

13. The humidifier of claim 11 , wherein the inlet passage is coupled to buoyant material or at least part of the inlet passage is made of buoyant material.

14. The humidifier of claim 11 , further comprising a flexible outlet passage configured to discharge the humidified flow of pressurized gas, and wherein the outlet passage is configured to be supported by the body of water retained in the tub base.

15. The humidifier of claim 14 , wherein the outlet passage is anchored to a wall of the humidifier at an outlet end, wherein the outlet passage comprises an open end, and wherein the outlet passage is configured to flex so that the open end remains above the surface of the body of water and water is prevented from entering the open end regardless of the orientation of the humidifier.

16. The humidifier of claim 14 , wherein the outlet passage is coupled to buoyant material or at least part of the outlet passage is made of buoyant material.

17. The humidifier of claim 14 , wherein the outlet passage is attached to the tub lid.

18. The humidifier of claim 11 , wherein the inlet passage is attached to the tub lid.

19. A respiratory apparatus configured to pressurize and humidify a flow of breathable gas for respiratory therapy to a patient, the respiratory apparatus comprising:

a flow generator configured to pressurize the flow of breathable gas to a pressure of 2-30 cm H 2 O; and

the humidifier of claim 11 .

20. A humidifier configured to humidify a flow of pressurized respiratory gas, the humidifier comprising:

a tub base configured to retain a body of water;

a tub lid configured to cover the tub base;

an inlet passage configured to receive the flow of pressurized respiratory gas, the inlet passage extending inwardly from an exterior of the humidifier; and

an outlet passage configured to discharge the humidified flow of pressurized respiratory gas, the outlet passage extending inwardly from the exterior of the humidifier,

wherein the inlet passage is configured to be flexed or pivoted by the surface of the water so that the inlet passage remains afloat on the water regardless of the orientation of the humidifier, and

wherein the outlet passage is configured to be flexed or pivoted by the surface of the water so that the outlet passage remains afloat on the water regardless of the orientation of the humidifier.