Granted Patent B2

US 8,336,549 · App. 11/809,435 · Granted Dec 25, 2012

Abstract

Claims (25)

1. A respiratory face mask for use on a user's face, comprising:

a shell formed of transparent material;

said shell having a top wall adapted to overlie said user's face when the mask is in use, said top wall being spaced apart from said user's face;

a side wall having a first end formed integrally with said top wall about the periphery of said top wall, said side wall extending toward said user's face in a gradual bend and ending in a second end;

a flange formed integrally with said second end of said side wall in circumscribing relation thereto, said flange extending radially outwardly relative to said shell to define a sealing cushion flange mounting surface proximal to said side wall second end, said sealing cushion flange mounting surface facing oppositely with respect to said top wall and being substantially coplanar throughout substantially its entire circumscribed extent;

a flexible and resilient sealing cushion mounted on said flange mounting surface in circumscribing relation thereto, said sealing cushion adapted to sealingly engage said user's face in the region of the user's nose, mouth, and chin;

said mask being generally pear-shaped and having a narrow first end adapted to fit over a user's nose;

said generally pear-shaped face mask having a middle region adapted to fit over a user's mouth, said middle region having a breadth greater than said narrow first end;

said generally pear-shaped face mask having a broad second end, said broad second end having a breadth greater than the breadth of said middle region, said broad second end of said pear-shaped face mask defining an under-the-chin engagement portion adapted to engage the underside of the user's chin or jaw when said narrow first end is fitted over said user's nose, said middle region fitting over said user's mouth when said sealing cushion is in engagement with said user's face in the region of the user's nose, mouth, and chin;

said sealing cushion having a variable cross-sectional extent when viewed in side elevation with respect to said flange;

said sealing cushion having a portion of first cross-sectional extent in said narrow first end, a portion of second cross-sectional extent in said middle region, and a portion of third cross-sectional extent in said broad second end;

said sealing cushion portion of first cross-sectional extent being smaller than said sealing cushion portion of second cross-sectional extent; and

said sealing cushion portion of third cross-sectional extent mounted on said flange forming a portion of said under-the-chin engagement portion defined by said broad second end on said pear-shaped face mask.

2. The face mask of claim 1 , further comprising:

a first port formed in said top wall, substantially centrally thereof;

said first port adapted to releasably engage an elongate tube that forms a part of a breathing circuit.

3. The face mask of claim 2 , further comprising:

a second port formed in said top wall of said shell;

said second port being a CO 2 port positioned below said first port so that end-tidal breathing of a patient impinges directly onto said CO 2 port;

a remote CO 2 monitor

said CO 2 post adapted to be in fluid communication with said remote CO 2 monitor; and

said position optimizing the accuracy of CO 2 monitoring.

4. The face mask of claim 1 , further comprising:

a pair of posts mounted on said flange in transversely spaced apart relation to one another;

said posts defining strap fasteners for a strap when a strap extends around said user's head and when opposite ends of said strap engage an associated post.

Assignments (1)

Continuity (8)