Patient interface with a seal-forming structure having varying thickness

  • US 10,926,050 B2
  • Filed: 09/23/2016
  • Issued: 02/23/2021
  • Est. Priority Date: 09/23/2015
  • Status: Active Grant
First Claim
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1. A cushion assembly for 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 a patient'"'"'s airways including at least entrance of the patient'"'"'s nares, wherein the patient interface is configured to maintain a therapy pressure in a range of about 4 cmH2O to about 30 cmH2O above ambient air pressure in use, throughout the patient'"'"'s respiratory cycle, while the patient is sleeping, to ameliorate sleep disordered breathing, the cushion assembly comprising:

  • an elastomeric support portion;

    an elastomeric seal-forming structure supported by the elastomeric support portion and being shaped to be bisected by a sagittal plane that includes a line tangent to the elastomeric seal-forming structure at a superior tangent point and at an inferior tangent point, the elastomeric support portion being more rigid than the elastomeric seal-forming structure; and

    a chamber defined by the elastomeric support portion and the elastomeric seal-forming structure,wherein the elastomeric seal-forming structure comprises an inner surface forming a boundary for the chamber and comprises an outer surface opposite the inner surface,wherein the elastomeric seal-forming structure comprises a first compliant region that includes the superior tangent point and a second compliant region separated from the first compliant region by a support region that is more rigid than the first and second compliant regions, the support region being bounded by a first transition side adjacent the first compliant region and a second transition side adjacent the second compliant region,wherein the first and second transition sides oppose each other and form respective transitions from the more rigid support region to the first and second compliant regions,wherein the more rigid support region extends to and is anchored by the elastomeric support portion,wherein the elastomeric seal-forming structure forms an aperture configured to receive the patient'"'"'s nose,wherein the entirety of the more rigid support region is above an inferior rim of the aperture configured to receive the patient'"'"'s nose,wherein the more rigid support region is configured to resist crinkling and/or creasing of the first compliant region when the first compliant region is subject to a compressive force, andwherein for every point in the more rigid support region, the inner surface has a negative curvature when the outer surface has a positive curvature and the inner surface has a positive curvature when the outer surface has a negative curvature.

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