DEVICES FOR PREVENTION OF PRESSURE ULCERS
First Claim
1. A support surface for preventing pressure ulcers in a patient, the support surface comprising a multi-layer composite fabric comprising:
- a skin contact layer comprising a woven fabric of synthetic filament yarns woven to provide air permeability and moisture vapor permeability and having a thickness of less than 1 mm, the skin contact layer having an upper, skin contact surface and a bottom surface;
an absorbent middle layer abutting the bottom surface of the skin contact layer, the middle layer comprising a breathable microfiber fabric woven from synthetic fibers having a cross-sectional shape that includes a plurality of voids for generating a capillary effect for moisture transition from an upper surface of the middle layer to a bottom surface of the middle layer, wherein the skin contact layer and the middle layer are stitched together using a stitching pattern that is optimized to produce an open pattern with minimal puckering;
a bottom layer attached to the skin contact layer and the middle layer at a peripheral edge of each layer, the bottom layer comprising a breathable, waterproof fabric having a thickness of less that 1 mm that is woven from synthetic yarn to produce a moisture vapor transfer rate within the range of 5,000 to 20,000 grams per meter squared per 24 hours.
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Accused Products
Abstract
A support surface, such as an underpad, for preventing pressure sores in a patient is a multi-layer textile assembly having a skin contact layer formed from a fabric of synthetic filament yarns woven to provide air permeability and moisture vapor permeability and having a thickness of less than 1 mm. An absorbent middle layer is formed from a breathable microfiber fabric woven to provide for moisture transition from an upper surface of the middle layer to a bottom surface of the middle layer. The skin contact layer and the middle layer are stitched together using a stitching pattern optimized to produce an open pattern with minimal puckering. A bottom layer is formed from a breathable, waterproof fabric woven from synthetic yarn to produce a moisture vapor transfer rate within the range of 5,000 to 20,000 grams per meter squared per 24 hours. The three layers are attached together around their outer edges.
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Citations
24 Claims
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1. A support surface for preventing pressure ulcers in a patient, the support surface comprising a multi-layer composite fabric comprising:
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a skin contact layer comprising a woven fabric of synthetic filament yarns woven to provide air permeability and moisture vapor permeability and having a thickness of less than 1 mm, the skin contact layer having an upper, skin contact surface and a bottom surface; an absorbent middle layer abutting the bottom surface of the skin contact layer, the middle layer comprising a breathable microfiber fabric woven from synthetic fibers having a cross-sectional shape that includes a plurality of voids for generating a capillary effect for moisture transition from an upper surface of the middle layer to a bottom surface of the middle layer, wherein the skin contact layer and the middle layer are stitched together using a stitching pattern that is optimized to produce an open pattern with minimal puckering; a bottom layer attached to the skin contact layer and the middle layer at a peripheral edge of each layer, the bottom layer comprising a breathable, waterproof fabric having a thickness of less that 1 mm that is woven from synthetic yarn to produce a moisture vapor transfer rate within the range of 5,000 to 20,000 grams per meter squared per 24 hours. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A support surface for preventing pressure ulcers in a patient, the support surface comprising a multi-layer composite fabric comprising:
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a skin contact layer comprising a woven fabric of nylon-polyester filament yarns woven to provide a pore size of 4 to 10 microns and having a thickness of less than 1 mm, the skin contact layer having an upper, skin contact surface and a bottom surface; an absorbent middle layer abutting the bottom surface of the skin contact layer, the middle layer comprising a breathable microfiber fabric woven from polyester fibers having a cross-sectional shape that includes a plurality of channels for generating a capillary effect for moisture transition from an upper surface of the middle layer to a bottom surface of the middle layer, wherein the skin contact layer and the middle layer are stitched together with a tension and a stitch length that is optimized to produce minimal puckering; a bottom layer attached to the skin contact layer and the middle layer at a peripheral edge of each layer, the bottom layer comprising a breathable, waterproof fabric coated with polyurethane and having a thickness of less that 1 mm that is woven from synthetic yarn to produce a moisture vapor transfer rate within the range of 5,000 to 20,000 grams per meter squared per 24 hours. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification