Mask system with snap-fit shroud

  • US 9,757,533 B2
  • Filed: 08/12/2013
  • Issued: 09/12/2017
  • 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 comprising;

    a frame having an internal surface forming a breathing chamber, the frame including a circular frame opening positioned to receive a supply of air at positive pressure, the frame including a cylindrical collar, the collar surrounding said frame opening, the collar projecting from an external surface of the frame in a direction away from the breathing chamber, the collar having a longitudinal axis, the collar having a cylindrical surface and a plurality of protrusions that protrude radially relative to the cylindrical surface, and the protrusions being spaced from one another about the circumference of the cylindrical surface of the collar, wherein the frame, including the cylindrical collar and the plurality of protrusions, is constructed of a first material,a cushion constructed of an elastomeric material that is a different material from the first material, the first material 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, anda protruding vent arrangement having a plurality of holes for gas washout from the breathing chamber to atmosphere, the protruding vent arrangement including a vent-wall having the plurality of holes, the vent-wall being spaced from an adjacent portion of the frame by a lower wall and two lateral side walls of the protruding vent arrangement, and the protruding vent arrangement positioned above the frame opening,wherein the cushion and the frame are joined to form a one-piece, integrated component;

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

    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; and

    a shroud removably connected to the cushion module, the shroud having a vent-receiving opening that receives the protruding vent arrangement, wherein the shroud includes a circular elbow opening that accommodates the elbow, wherein the shroud includes a rear surface that at least partly covers the external surface of the frame of the cushion module and the shroud includes a plurality of snap fingers, the plurality of snap fingers being circumferentially spaced about the elbow opening, and the plurality of snap fingers projecting from the rear surface of the shroud in a direction towards the breathing chamber, wherein the shroud, including the plurality of snap fingers, is constructed of a second material, the second material of the shroud being harder than the elastomeric material of the cushion, the shroud being more rigid than the cushion, and wherein the shroud includes a pair of upper headgear connectors and a pair of lower headgear connectors, said pair of upper headgear connectors structured to connect to said headgear, and said pair of lower headgear connectors structured to connect to said headgear via clips,wherein, to removably connect the shroud and the cushion module, the plurality of snap fingers are structured to resiliently deflect in a radial direction relative to the longitudinal axis of the collar to form a removable snap-fit connection with corresponding ones of the plurality of protrusions of the collar by moving the cushion module and the shroud towards one another along the longitudinal axis of the collar.

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