Patient interface component

1. A pad for forming a seal forming structure against a user's skin for use with a patient interface, the pad comprising:

a base layer having a first permeability to at least one substance;

a fiber layer comprising a plurality of fibers for contacting a patient's skin, each fiber of the fiber layer being spaced apart from the base layer; and

a connection layer for connecting the fibers to the base layer, the connection layer having a second permeability to the at least one substance;

wherein the base layer and/or the fiber layer is/are adapted to act as a reservoir for the at least one substance;

wherein the first permeability is an adjusted permeability that is configured to allow controlled speed of substance migration from the base layer to the connection layer; wherein the second permeability is an adjusted permeability that is configured to allow controlled speed of substance migration from the connection layer to the fiber layer; and wherein the first permeability is greater than the second permeability.

2. The pad according to claim 1 , wherein the connection layer allows a predefined/limited flow rate of the at least one substance therethrough.

3. The pad according to claim 2 , wherein the predefined/limited flow rate is configured to be achieved as a result of contact with the patient's face.

4. The pad according to claim 1 , wherein the connection layer comprises a micro-porosity, macro-porosity, and/or is adapted to allow diffusion at a chemical level.

5. The pad according claim 4 , wherein the connection layer comprises the macro-porosity, and wherein the macro-porosity is configured to be mechanically created using a needle and/or a laser.

6. The pad according to claim 1 , wherein the base layer has an average pore diameter ranging from about 0.2 mm to about 1.0 mm.

7. The pad according to claim 1 , wherein the connection layer has a pore size ranging from about 0.5 mm to about 1.0 mm.

8. The pad according to claim 1 , wherein the connection layer has a pore size ranging from about 0.1 μm to about 50 μm.

9. The pad according to claim 8 , wherein the connection layer has a pore size of about 1 μm.

10. The pad according to claim 1 , wherein the plurality of fibers are adapted to serve as a wick to enable the at least one substance to migrate from the base layer to the patient's skin.

11. The pad according to claim 1 , wherein the connection layer is a mesh-reinforced layer.

12. The pad according to claim 1 , wherein the connection layer is a foam.

13. The pad according to claim 1 , wherein the connection layer is a membrane layer allowing the at least one substance to migrate (1) from the base layer, through the connection layer and to the fiber layer, and/or (2) from the fiber layer, through the connection layer, and to the base layer.

14. The pad according to claim 1 , wherein the plurality of fibers are in fluid communication with the base layer.

15. The pad according to claim 1 , wherein

the base layer includes a first base surface and a second base surface opposite the first base surface;

the connection layer includes a first connection surface and a second connection surface opposite the first connection surface, the first connection surface is directly coupled to the second base surface; and

an adhesive layer includes a first adhesive surface configured to contact a cushion of the patient interface, and a second adhesive layer opposite the first adhesive surface and directly coupled to the first base surface.

16. The pad according to claim 15 , wherein the adhesive layer includes a third permeability to the at least one substance that is less than the second permeability, the adhesive layer is configured to direct the substance toward the connection layer.

17. The pad according to claim 15 , wherein the connection layer and the adhesive layer are joined by cold welding to create a rounded edge.

18. The pad according to claim 1 , wherein the controlled speed of substance migration through the connection layer creates a pressure increase inside the base layer in response to a volume reduction as the base layer gets compressed.

19. The pad according to claim 1 , wherein the second permeability is configured to allow for a substantially constant flow rate of the substance through the connection layer.

20. The pad according to claim 1 , wherein a release rate per mm 2 of a contact surface of the fiber layer is between about 0.01 mg/hr and about 10 mg/hr.

21. The pad of claim 1 , wherein the connection layer is a solid closed layer without pores on a macroscopic level, and includes pores on a microscopic and/or molecular level that allow permeability on a molecular level.

22. The pad of claim 21 , wherein the pores on the microscopic and/or molecular level are a mesh or an interconnected molecular chain.

23. The pad of claim 1 , further comprising pores randomly distributed throughout the connection layer and having random sizes, the pores configured to allow the substance to migrate between the base layer and the fiber layer.

24. A patient interface comprising a pad or set of pads according to claim 1 constituting a sealing structure, the patient interface further comprising,

a positioning and stabilizing structure to maintain the pad or set of pads in sealing contact with an area surrounding an entrance to the patient's airways while maintaining a therapeutic pressure at the entrance to the patient's airways;

a plenum chamber pressurized at a pressure above ambient pressure in use; and

a gas washout vent configured to allow a flow of patient exhaled CO2 to an exterior of the patient interface to minimize rebreathing of exhaled CO2 by the patient.

25. The patient interface of claim 24 , wherein

the pad or set of pads is/are configured to compress while contacting the area surrounding an entrance to the patient's airways; and

the second permeability is configured to allow for a substantially constant flow rate of the substance through the connection layer while the pad or set of pads is/are compressed.