Therapeutic mattress system and coverings

Abstract

A sheet for use with a therapeutic mattress having at least one airway aperture through a mattress body. The sheet comprises a sheet body sized to cover an upper surface and side walls of the mattress body, and a periphery retention feature comprising at least one of an elastic band, corner pockets, straps, ties, or a zipper. One or more functional openings are disposed in the sheet body and positionable to overlie corresponding apertures when the fitted sheet is installed on the mattress body. The functional opening is configured to preserve an airway through the corresponding aperture during face-down use. Registration of the functional opening over the corresponding aperture is maintained by a peripheral retention structure surrounding the functional opening or tension of the sheet body when installed.

What is claimed is: 
     
         1 . A removable, washable fitted sheet for use with a therapeutic mattress having at least one aperture through a mattress body, the fitted sheet comprising:
 a sheet body sized to cover an upper surface and side walls of the mattress body;   a periphery retention feature comprising at least one of: an elastic band; corner pockets; straps; ties; a zipper; and   one or more functional openings disposed in the sheet body and positionable to overlie a corresponding aperture when the fitted sheet is installed on the mattress body, each functional opening being configured to preserve an airway through the corresponding aperture during face-down use;   wherein registration of the functional opening over the corresponding aperture is maintained by at least one of: (i) a peripheral retention structure surrounding the functional opening; (ii) tension of the sheet body when installed.   
     
     
         2 . The fitted sheet of  claim 1 , wherein the peripheral retention structure comprises a depending annular sleeve or gusseted pocket that extends below a plane of the sheet body into the aperture when installed. 
     
     
         3 . The fitted sheet of  claim 2 , wherein the depending annular sleeve has a depth of at least 10 mm to shield a user's face from direct contact with an edge of the aperture or a support frame. 
     
     
         4 . The fitted sheet of  claim 1 , wherein the peripheral retention structure comprises at least one of: a semi-rigid ring; a drawstring channel; indexed elastic segments; snap fasteners; hook-and-loop pads; a zipper ring. 
     
     
         5 . The fitted sheet of  claim 1 , wherein at least one functional opening further comprises a breathable liner spanning at least a portion of the functional opening to permit air passage through the corresponding aperture. 
     
     
         6 . The fitted sheet of  claim 5 , wherein the breathable liner is removably serviceable via a zipper, snap, or hook-and-loop interface. 
     
     
         7 . The fitted sheet of  claim 5 , wherein the breathable liner comprises a mesh textile and optionally an antimicrobial or hypoallergenic treatment. 
     
     
         8 . The fitted sheet of  claim 5 , wherein the breathable liner further comprises a replaceable filter element selected from charcoal, foam, or HEPA-type media. 
     
     
         9 . The fitted sheet of  claim 1 , wherein the functional opening is dimensioned to pass and seat a C-shaped pillow in the aperture while the fitted sheet remains installed. 
     
     
         10 . The fitted sheet of  claim 1 , wherein the functional opening is dimensioned to pass a bung configured to plug the aperture substantially flush with surrounding sheet fabric. 
     
     
         11 . The fitted sheet of  claim 1 , further comprising a cinch or closure around a periphery of the functional opening to tighten sheet fabric around an inserted pillow, bung, or support frame. 
     
     
         12 . The fitted sheet of  claim 1 , further comprising a standoff spacer at the functional opening, the standoff spacer comprising a compressible or semi-rigid frame that tents the sheet fabric away from a user's face, with or without the breathable liner. 
     
     
         13 . The fitted sheet of  claim 1 , wherein the functional opening comprises intersecting slits, a tear-away or perforated panel, or a zippered flap that expands in use to define the functional opening. 
     
     
         14 . The fitted sheet of  claim 1 , wherein the sheet body comprises orientation indicia keyed to head/foot alignment of the apertures, and a textile selected from cotton, polyester, synthetic blends, or fluid-resistant barrier fabric. 
     
     
         15 . A removable, washable fitted sheet for use with a therapeutic mattress having at least one aperture through a mattress body, the fitted sheet comprising:
 a sheet body sized to cover an upper surface and side walls of the mattress body;   a periphery retention feature comprising at least one of: an elastic band; corner pockets; straps; ties; a zipper; and   at least one permeable panel region disposed in the sheet body and coextensive with at least a portion of a corresponding aperture when the fitted sheet is installed, the permeable panel region having an air permeability greater than surrounding portions of the sheet body and being configured to preserve an airway through the corresponding aperture during face-down use.   
     
     
         16 . The fitted sheet of  claim 15 , wherein the permeable panel region comprises a 3D spacer knit or monofilament mesh having a thickness sufficient to maintain a stand-off from a user's face. 
     
     
         17 . The fitted sheet of  claim 15 , wherein the permeable panel region is removably coupled to the sheet body for laundering or replacement. 
     
     
         18 . The fitted sheet of  claim 15 , further comprising edge reinforcement around the permeable panel region selected from stitched borders, elastic linings, hems, or semi-rigid frames. 
     
     
         19 . The fitted sheet of  claim 15 , wherein the permeable panel region comprises a multi-layer filter stack. 
     
     
         20 . The fitted sheet of  claim 15 , wherein registration of the permeable panel region over the corresponding aperture is maintained by at least one of: a semi-rigid frame; a drawstring channel; indexed clastic segments; snap fasteners; sheet tension when installed.