Textile patient interface
A patient interface for sealed delivery of a flow of air at a continuously positive pressure with respect to ambient air pressure to an entrance to the patient's airways including at least entrance of a patient's nares to ameliorate sleep disordered breathing may include a seal-forming structure comprising a foam undercushion and a textile membrane for contact with the patient's face; a positioning and stabilising structure to maintain the seal-forming structure 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; and a plenum chamber pressurised at a pressure above ambient pressure in use.
1. A patient interface for sealed delivery of a flow of air at positive pressure with respect to ambient air pressure to an entrance to the airways of a patient including at least the nares of the patient, wherein the patient interface is configured to maintain a therapy pressure in a range of about 4 cmH 2 O to about 30 cmH 2 O above ambient air pressure in use, throughout the patient's respiratory cycle, while the patient is sleeping, to ameliorate sleep disordered breathing, said patient interface comprising:
a plenum chamber at least partially forming a breathing chamber pressurisable to a therapeutic pressure above ambient air pressure, said plenum chamber including a plenum chamber inlet sized and structured to receive a flow of air at the therapeutic pressure for breathing by a patient;
a seal-forming structure constructed and arranged to seal with a region of the patient's face surrounding an entrance to the patient's airways, said seal-forming structure having an opening formed therein such that the flow of air at said therapeutic pressure is delivered to at least an entrance to the patient's nares; and
a vent comprising a plurality of holes constructed and arranged to allow for the washout of exhaled gases,
wherein the plenum chamber comprises a textile outer layer, a textile inner layer and a foam inner layer disposed between the textile outer layer and the textile inner layer, the textile outer layer and the textile inner layer being respectively joined to opposing sides of the foam inner layer.
2. The patient interface of claim 1 , wherein the textile outer layer and the textile inner layer are joined to the foam inner layer by thermoforming, welding and/or laminating.
3. The patient interface of claim 1 , wherein a thickness of the foam inner layer varies across the plenum chamber.
4. The patient interface of claim 1 , wherein, in a transverse cross-sectional view of the plenum chamber, the foam inner layer has a relatively larger thickness in a central portion of the plenum chamber and a relatively smaller thickness at lateral end portions of the plenum chamber.
5. The patient interface of claim 1 , wherein the foam inner layer has a uniform thickness throughout the plenum chamber.
6. The patient interface of claim 1 , wherein the foam inner layer has a rectangular profile in cross-section.
7. The patient interface of claim 1 , wherein the textile outer layer and the textile inner layer together completely surround the foam inner layer.
8. The patient interface of claim 1 , wherein the plenum chamber has a connection port formed around the plenum chamber inlet for connection with an air supply circuit.
9. The patient interface of claim 8 , wherein an overmold forms the connection port, the overmold sealing at a joint between the textile outer layer and the textile inner layer.
10. The patient interface of claim 1 , wherein the seal-forming structure includes a textile membrane arranged to form the seal with a region of the patient's face.
11. The patient interface of claim 10 , wherein the textile membrane has an air impermeable material provided thereon.
12. The patient interface of claim 10 , wherein the textile membrane is configured to inflate upon pressurization of the breathing chamber.
13. The patient interface of claim 1 , wherein the seal-forming structure includes a foam undercushion layer.
14. The patient interface of claim 1 , further comprising a positioning and stabilizing structure to maintain the seal-forming structure in sealing contact with the patient's face, the positioning and stabilizing structure including a pair of side straps configured to extend along respective sides of the patient's face in use.
15. The patient interface of claim 14 , wherein the side straps are integrally formed with the plenum chamber.
16. The patient interface of claim 1 , wherein the plenum chamber includes the vent.
17. The patient interface of claim 1 , wherein the seal-forming structure is constructed and arranged to seal with an underside of the patient's nose.
18. The patient interface of claim 1 , wherein:
the textile outer layer and the textile inner layer are joined to the foam inner layer by thermoforming, welding and/or laminating;
the textile outer layer and the textile inner layer together completely surround the foam inner layer;
the plenum chamber has a connection port formed around the plenum chamber inlet for connection with an air supply circuit;
the seal-forming structure includes a textile membrane arranged to form the seal with a region of the patient's face;
the textile membrane has an air impermeable material provided thereon; and
a positioning and stabilizing structure is configured to maintain the seal-forming structure in sealing contact with the patient's face, the positioning and stabilizing structure including a pair of side straps configured to extend along respective sides of the patient's face in use;
the plenum chamber includes the vent; and
the seal-forming structure is constructed and arranged to seal with an underside of the patient's nose.
19. The patient interface of claim 18 , wherein a thickness of the foam inner layer varies across the plenum chamber.
20. The patient interface of claim 18 , wherein the foam inner layer has a uniform thickness throughout the plenum chamber.