Mattress overlay for avoidance of decubitus ulcers
First Claim
1. A mattress overlay for avoiding decubitus ulcers, comprising:
- a base layer of polyurethane foam material having a density between about 1.80 to 2.00 lbs/ft3;
an upper layer affixed to an upper surface of said base layer, said second layer being formed of polyurethane foam and having a density between about 2.30 to 2.70 lbs/ft3 ; and
wherein said base layer has a 5% indentation load deflection between about 26 to 38, a 25% indentation load deflection between about 39 to 49 and a 65% indentation load deflection between about 70 to 105.
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Accused Products
Abstract
A laminated foam mattress overlay for preventing the formation of decubitus ulcers in bedridden individuals. The mattress overlay includes an upper layer of polyurethane foam laminated to a base layer of a different polyurethane foam. The upper lay features a polyurethane foam which is of a higher density than the base layer. The upper layer also includes a higher initial softness ratio than the base layer. The base layer has higher 5, 25 and 65% indentation load deflection values (ILD) than the corresponding ILD values for the upper layer which is attributable to the firmer support provided by the foundation or base layer. The base layer is preferably thicker than the upper layer which can include a checkerboard-like upper surface. The combination of layers provides for a reduction in pressure points in the areas of greatest concern such as the hip and heel. The combination of layers work together to provide firm, comfortable support while distributing loads in the high risk areas of the body to help in avoiding the formation of ulcers.
187 Citations
29 Claims
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1. A mattress overlay for avoiding decubitus ulcers, comprising:
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a base layer of polyurethane foam material having a density between about 1.80 to 2.00 lbs/ft3; an upper layer affixed to an upper surface of said base layer, said second layer being formed of polyurethane foam and having a density between about 2.30 to 2.70 lbs/ft3 ; and
wherein said base layer has a 5% indentation load deflection between about 26 to 38, a 25% indentation load deflection between about 39 to 49 and a 65% indentation load deflection between about 70 to 105. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A mattress overlay for avoiding decubitus ulcers, comprising:
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a base layer of polyurethane foam material having a 5% indentation load deflection between about 26 to 38, a 25% indentation load deflection between about 39 to 49 and a 65% indentation load deflection between about 70 to 105; an upper layer affixed to an upper surface of said base layer, said upper layer being formed of polyurethane foam having a 5% indentation load deflection between about 4 to 9, a 25% indentation load deflection between about 11 to 21 and a 65% indentation load deflection between about 30 to 70. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A mattress overlay for avoiding decubitus ulcers, comprising:
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a base layer formed of polyurethane foam; an upper layer formed of polyurethane foam and affixed to an upper surface of said base layer; said upper layer having a higher density and initial softness ratio than said base layer and said base layer being thicker than said upper layer. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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27. A mattress overlay for avoiding decubitus ulcers, comprising:
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a base layer of polyurethane foam; an upper layer of polyurethane foam having a higher density value than said base layer, said upper layer being secured to said base layer and having an upper support surface; said mattress overlay having a plurality of depressions formed therein which are arranged in a checkerboard-like sequence and originate at said upper support surface and extend into said base layer. - View Dependent Claims (28, 29)
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Specification