Patient interface with a seal-forming structure having varying thickness

  • US 10,799,661 B2
  • Filed: 09/23/2016
  • Issued: 10/13/2020
  • 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 seal-forming portion shaped to be bisected by a sagittal plane that includes a line tangent to the elastomeric seal-forming portion at a superior tangent point and an inferior tangent point,wherein the elastomeric seal-forming portion comprises;

    a dome-shaped superior region that straddles the sagittal plane in the vicinity of the superior tangent point,a saddle-shaped inferior region that straddles the sagittal plane and includes the inferior tangent point,a first support region extending from the saddle-shaped inferior region to the dome-shaped superior region, the first support region having a consistent elastomeric wall thickness that is greater than an elastomeric wall thickness of the dome-shaped superior region and the saddle-shaped inferior region, anda second support region adjacent the first support region that extends from the saddle-shaped inferior region to the dome-shaped superior region, the second support region being bounded by the first support region on a proximal side and having a distal side opposite the proximal side, an elastomeric wall thickness in the second support region increases from the distal side to the proximal side.

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