Mask system with snap-fit shroud

  • US 9,962,511 B2
  • Filed: 10/04/2017
  • Issued: 05/08/2018
  • Est. Priority Date: 03/04/2008
  • Status: Active Grant
First Claim
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1. A mask system to provide positive air pressure therapy to a patient, the mask system comprising:

  • a cushion module forming a breathing chamber, the cushion module comprising;

    a frame having an interior surface exposed to the breathing chamber, the frame including a frame opening positioned to receive a supply of air at positive pressure, wherein the frame includes a collar surrounding the frame opening and extending away from an exterior surface of the frame, the collar having a longitudinal axis, and the collar having a cylindrical surface with an axis that is coincident with the longitudinal axis of the collar, wherein the collar includes a first radial protrusion and a second radial protrusion extending from the cylindrical surface, each of the first radial protrusion and the second radial protrusion having a part-annular shape and having a curvature centered about the longitudinal axis of the collar, wherein the frame, including the collar and each of the first radial protrusion and the second radial protrusion, is constructed from a first material, anda cushion constructed of an elastomeric material that is a different material from the first material, the first material of the frame being harder than the elastomeric material of the cushion, the frame being more rigid than the cushion, the cushion configured to seal against the patient'"'"'s face in use to enable the supply of air at positive pressure to be delivered to at least the patient'"'"'s nose,wherein the cushion and the frame are joined to form an integrated component;

    an elbow configured to receive the supply of air at positive pressure and deliver the supply of air at positive pressure to the breathing chamber;

    a shroud configured to removably connect to the frame of the cushion module, wherein the shroud includes an elbow opening that accommodates the elbow, wherein the shroud includes a rear surface at least partly covering the exterior surface of the frame, the shroud having a first part-annular snap connection portion and a second part-annular snap connection portion circumferentially spaced from one another and centered about a longitudinal axis of the elbow opening, the first part-annular snap connection portion and the second part-annular snap connection portion being positioned rearward of the elbow opening of the shroud, wherein the shroud, including the first part-annular snap connection portion and the second part-annular snap connection portion, is constructed from a second material, the second material of the shroud being harder than the elastomeric material of the cushion, and the shroud being more rigid than the cushion;

    headgear configured to connect to the shroud to maintain the cushion module in position on the patient'"'"'s head in use; and

    a vent arrangement having a plurality of holes for gas washout from the breathing chamber to atmosphere,wherein the shroud includes headgear connectors structured to connect to said headgear,wherein, to releasably connect the shroud to the cushion module, each of the first radial protrusion and the second radial protrusion and a corresponding one of the first part-annular snap connection portion and the second part-annular snap connection portion are structured to form a removable snap-fit connection by moving the cushion module and the shroud towards one another along the longitudinal axis of the collar, andwherein when the first radial protrusion and the second radial protrusion and the first part-annular snap connection portion and the second part-annular snap connection portion are joined to form the removable snap-fit connection, the cushion module and the shroud are stabilized against rotation relative to one another.

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