Support apparatus, system and method
A therapeutic support device includes a bladder having one or more independently inflatable compartments, each including a plurality of inflatable cells. When inflated, each inflatable cell forms a contact node that may support a user or another object disposed thereon. The inflatable compartments can be alternately inflated and deflated such that contact pressure can be applied to and relieved from corresponding portions of the user's body in an alternating manner.
1. A support surface overlay comprising:
a first flexible sheet;
a second flexible sheet joined to said first flexible sheet by at least one continuous, sinusoidally-shaped seam, said first flexible sheet, said second flexible sheet and said at least one seam defining a first selectively inflatable compartment comprising a plurality of inflatable cells arranged in a plurality of rows;
a first fluid conduit connecting an interior of said first selectively inflatable compartment with an exterior of said first selectively inflatable compartment in fluid communication; and
a first relief cut perforating said first flexible sheet and said second flexible sheet between a pair of said rows of inflatable cells, said first relief cut not perforating said at least a first selectively inflatable compartment, and said first relief cut extending continuously over at least about PI radians of said sinusoidally-shaped seam.
2. The support surface overlay of claim 1 further comprising a second relief cut between said first pair of said rows of inflatable cells, wherein an uncut portion separates said first relief cut from said second relief cut.
3. The support surface overlay of claim 2 wherein said second relief cut extends over at least about PI radians of said sinusoidally-shaped seam and said uncut portion extends over at least about PI radians of said sinusoidally-shaped seam.
4. The support surface overlay of claim 3 wherein said first relief cut extends over at least about five PI radians of said sinusoidally-shaped seam.
5. The support surface overlay of claim 1 further comprising a stress relief at an end of said first relief cut.
6. The support surface overlay of claim 1 , wherein said second flexible sheet defines at least one aperture.
7. The support surface overlay of claim 6 , said at least one aperture configured to allow controlled release therethrough of a medium from within said at least one selectively inflatable compartment and through an intersticial region defined by said inflatable cells.
8. The support surface overlay of claim 1 , wherein said second flexible sheet comprises a permeable material configured to allow controlled release therethrough of a medium from within said at least one selectively inflatable compartment.
9. The support surface overlay of claim 8 , said permeable material being sufficiently fluid-tight to allow for inflation of said inflatable compartments.
10. The support surface overlay of claim 1 further comprising a third flexible sheet joined to said first flexible sheet.
11. The support surface overlay of claim 10 further comprising a fourth flexible sheet joined to said second flexible sheet, said third and fourth flexible sheets defining a plenum.
12. The support surface overlay of claim 11 further comprising a fluid conduit in communication with an interior of said plenum and an exterior of said plenum.
13. The support surface overlay of claim 11 , wherein said second flexible sheet comprises a permeable material configured to allow controlled release therethrough of a medium from within said at least one selectively inflatable compartment into said plenum or said second flexible sheet comprises at least one aperture configured to allow controlled release therethrough of a medium from within said at least one selectively inflatable compartment into said plenum.
14. The support surface overlay of claim 13 wherein said fourth flexible sheet comprises a permeable material configured to allow controlled release therethrough of a medium from within said plenum.
15. The support surface overlay of claim 1 further comprising an envelope about said first flexible sheet and said second flexible sheet.
16. The support surface overlay of claim 15 wherein said envelope is secured to at least one of said first flexible sheet and said second flexible sheet.
17. The support surface overlay of claim 15 wherein said envelope is secured to at least one of said first flexible sheet and said second flexible sheet at a perimeter region of said first flexible sheet and said second flexible sheet.
18. The support surface overlay of claim 15 wherein said envelope is secured to at least one of said first flexible sheet and said second flexible sheet distant from a perimeter region of said first flexible sheet and said second flexible sheet.
19. The support surface overlay of claim 15 wherein said envelope is substantially fluid tight.
20. The support surface overlay of claim 1 , said first flexible sheet, said second flexible sheet, and said at least one seam further defining a second selectively inflatable compartment comprising a second plurality of inflatable cells, said first and second selectively inflatable compartments being selectively inflatable independent of one another.
21. The support surface overlay of claim 1 , said plurality of inflatable cells being operable at inflation pressures of up to eight pounds per square inch.
22. The support surface overlay of claim 1 , said plurality of inflatable cells being operable at inflation pressures of up to ten pounds per square inch.
23. The support surface overlay of claim 1 , said plurality of inflatable cells defining corresponding contact nodes, said contact nodes having a nodal density of at least about two nodes per square decimeter.
24. The support surface overlay of claim 1 , said relief cut being formed within the confines of said seam.
25. The support surface overlay of claim 1 , said at least one seam being a welded seam comprising at least one weld line.
26. The support surface overlay of claim 1 , said relief cut being configured to mitigate side-to-side contraction of said support surface overlay when said support surface overlay is inflated from a deflated condition to an inflated condition.