US20090172887A1 - Laminated visco-elastic support - Google Patents

Laminated visco-elastic support Download PDF

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Publication number
US20090172887A1
US20090172887A1 US12/407,605 US40760509A US2009172887A1 US 20090172887 A1 US20090172887 A1 US 20090172887A1 US 40760509 A US40760509 A US 40760509A US 2009172887 A1 US2009172887 A1 US 2009172887A1
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United States
Prior art keywords
foam layer
bed mattress
foam
visco
layered bed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US12/407,605
Inventor
Dag Landvik
Michael B. Allaway
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Tempur Pedic Management LLC
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Individual
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Publication date
Priority claimed from GB9411120A external-priority patent/GB2290256B/en
Priority claimed from GB9411504A external-priority patent/GB9411504D0/en
Application filed by Individual filed Critical Individual
Priority to US12/407,605 priority Critical patent/US20090172887A1/en
Assigned to TEMPUR-PEDIC MANAGEMENT, INC. reassignment TEMPUR-PEDIC MANAGEMENT, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TEMPUR WORLD, LLC
Priority to US12/474,912 priority patent/US8034445B2/en
Publication of US20090172887A1 publication Critical patent/US20090172887A1/en
Assigned to BANK OF AMERICA, N.A., AS COLLATERAL AGENT reassignment BANK OF AMERICA, N.A., AS COLLATERAL AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TEMPUR-PEDIC MANAGEMENT, INC.
Assigned to TEMPUR WORLD, LLC reassignment TEMPUR WORLD, LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: TEMPUR WORLD, INC.
Assigned to TEMPUR WORLD, INC. reassignment TEMPUR WORLD, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FAGERDALA WORLD FOAMS AB
Assigned to TEMPUR WORLD, LLC reassignment TEMPUR WORLD, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALLAWAY, MICHAEL B
Assigned to FAGERDALA WORLD FOAMS AB reassignment FAGERDALA WORLD FOAMS AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LANDVIK, DAG
Assigned to TEMPUR-PEDIC MANAGEMENT, LLC reassignment TEMPUR-PEDIC MANAGEMENT, LLC RELEASE OF LIEN ON PATENTS Assignors: BANK OF AMERICA, N.A., AS DOMESTIC COLLATERAL AGENT
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
    • A47C27/14—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays
    • A47C27/15—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays consisting of two or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0278—Polyurethane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2479/00—Furniture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/23—Sheet including cover or casing
    • Y10T428/233—Foamed or expanded material encased
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/2495—Thickness [relative or absolute]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/24983—Hardness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y10T428/24992—Density or compression of components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249981—Plural void-containing components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249987—With nonvoid component of specified composition
    • Y10T428/249991—Synthetic resin or natural rubbers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249987—With nonvoid component of specified composition
    • Y10T428/249991—Synthetic resin or natural rubbers
    • Y10T428/249992—Linear or thermoplastic

Definitions

  • the invention relates to mattresses and cushions, and more particularly to supports made of visco-elastic material.
  • Known supports made of standard polyurethane foam do not provide even or well-distributed support of a body reclining thereon because of the polyurethane material.
  • Such known standard supports have a spring-like characteristic that tends to return an increased reactive force in response to increasingly large forces on the support.
  • the greater the deflection of the polyurethane support the greater the reactive force provided by the standard support.
  • This spring-like characteristic is undesirable in the case of long-term patient care because the points at which the greatest pressure occurs are the points at which pressure sores can be formed.
  • the present invention therefore seeks to provide improved supports, such as mattresses and cushions, for pressure-relief.
  • a laminated support for pressure-relief comprising at least two layers of foam adhered together, wherein at least one layer is a visco-elastic foam.
  • the laminated support comprises two layers of visco-elastic foam adhered together, wherein one layer of visco-elastic foam has a greater hardness than the other layer.
  • the laminated support may further comprise a layer of polyurethane foam adhered to the layers of visco-elastic foam.
  • the laminated support comprises a single layer of visco-elastic foam and a single layer of polyurethane foam adhered together.
  • the visco-elastic properties of the laminated support respond to a combination of body weight and body temperature.
  • visco-elastic foam supports tend to soften when heated, and therefore tend to soften in response to body heat.
  • relatively hard visco-elastic material will initially firmly support a body lying thereon and will soften at the pressure points.
  • the support subsequently gently molds to the form of the body, allowing pressure to be absorbed uniformly and distributed evenly across the support. This property is of particular benefit in the prevention and healing of pressure sores.
  • FIG. 1 shows a side view of a support embodying the present invention.
  • FIG. 2 shows a side view of a support that is an alternative embodiment of the present invention.
  • FIG. 3 shows a side view of a support that is a second alternative embodiment of the present invention.
  • FIG. 4 shows a side view of a support that is a third alternative embodiment of the invention.
  • FIG. 5 is a perspective view in partial cross section of the support shown in FIG. 1 .
  • FIG. 6 is a perspective view in partial cross section of the support shown in FIG. 2 .
  • FIG. 7 is a perspective view in partial cross section of the support shown in FIG. 3 .
  • the support or cushion A shown in FIGS. 1 and 5 includes a bottom layer 1 of 40 mm thick visco-elastic foam having a density of 110 kg/m 3 and a hardness of 30N, and a top layer 2 of 10 mm thick visco-elastic foam having a density of 85 kg/m3 and a hardness of 10N.
  • the support B shown in FIGS. 2 and 6 is well-suited for use as an overlay which can be placed on top of an existing mattress to provide extra comfort and pressure-relief.
  • the overlay B includes a bottom layer 3 of 60 mm thick visco-elastic foam having a density of 83 kg/m 3 and a hardness of 13N, and a top layer 4 of 10 mm thick visco-elastic foam having a density of 83 kg/m 3 and a hardness of 10N.
  • a support similar to the construction of support B could also be manufactured to include a bottom layer of 80 mm thick highly resilient polyurethane foam having a density of 35 kg/m 3 and a hardness of 12N, and a top layer of 70 mm thick visco-elastic foam having a density of 82 kg/m 3 and a hardness of 13N.
  • the support C shown in FIGS. 3 and 7 is well-suited for use as a mattress and includes a bottom layer 5 of 75 mm thick polyurethane foam having a density of 35 kg/m 3 , a middle layer 6 of 60 mm thick visco-elastic foam having a density of 83 kg/m 3 and a hardness of 13N, and a top layer 7 of 10 mm deep visco-elastic foam having a density of 83 kg/m 3 and a hardness of 10N.
  • Suitable polyurethane foams are manufactured by A/S Dan-Foam, 5560 Arup, Denmark.
  • One example of a polyurethane foam has the manufacturer's code HE35S.
  • suitable visco-elastic foams are made by A/S Dan-Foam, 5560 Arup, Denmark and sold under the trade mark TEMPUR.
  • One such visco-elastic foam has the manufacturer's code T-85.
  • a preferred range of density of the visco-elastic foam is 50 to 120 kg/m 3 .
  • the layers comprising the cushion, overlay or mattress are adhered together using an enviromentally-friendly water-based adhesive such as SABA AQUABOND RSDTM, a two-component water-based adhesive produced by SABA DINXPERLO BV, B-7090 AA DINXPERLO, Belgium. Hardness is to be measured 65% compression at 20° C.
  • a 2 mm thick sheet 8 of a reticulated filter polyurethane foam is adhered to each outer face of the laminated support. This layer 8 is air permeable.
  • the support D illustrated by FIG. 4 includes a single layer of visco-elastic foam sandwiched between two layers of reticulated filter polyurethane foam.
  • the support D includes a sheet of visco-elastic foam 9 , which is sandwiched between two sheets of reticulated polyurethane foam 8 .
  • the sheet of visco-elastic foam 9 preferably has a thickness ranging from 50 mm to 150 mm, a density ranging from 50 kg/m 3 to 120 kg/m 3 , and a hardness ranging from 10N to 30N measured at 65% compression at 20° C.
  • any of the supports A, B, C, and D may be provided with an outer covering (not shown). Two examples of outer coverings are described below.
  • One example is a textile net cover followed by a removable outer fabric cover.
  • the textile net cover eases the taking on and off of the fabric cover and is made from a specially treated textile which allows the foam layers to ‘breathe’ whilst preventing contamination of the foam layers by fluids.
  • An example of such netting is the 100% cotton netting manufactured by BIDET & HORST GmbH & Co KG, D-4460Hörstel, Germany.
  • a second example of an outer covering is a waterproof, vapor-permeable cover made of base nylon fabric coated with polyurethane film.
  • this cover material is 0.25 mm thick, weighs 245 g/m 2 , and is constructed having a single sheet top surface, no joins, welded seams and a sealed zip flap.
  • this cover may be pretreated with an anti-bacterial agent.
  • the laminated support of the present invention when covered with the polyurethane coat nylon material ensures good hygiene for patients with incontinence.
  • the elasticity of the cover allows the pressure-relieving properties of the visco-elastic foam to be unimpaired.
  • Laminated supports manufactured in accordance with the present invention allow air to circulate around a patient's skin and thus avoid the discomfort of perspiration and skin irritation.
  • the visco-elastic foam layers provide the laminated support with its special pressure-relieving properties.
  • the support is thus able to mould according to the weight and temperature of a body in contact therewith. When the body is moved from a particular point of contact, the support quickly regains its initial shape, ready to be re-molded.
  • This property of the support is different from normally polyurethane foams which bulk up when compressed, thereby exerting pressure rather than relieving it.
  • the quality of sleep of a person reclining on a support constructed of layers of foam having visco-elastic properties is different from normal polyurethane foams which bulk up when compressed, thereby exerting pressure rather than relieving it.
  • the support In use, it is the side of the support which has the visco-elastic foam layer, or the softest visco-elastic foam layer, foremost which is arranged for contact with a person's body.
  • the support does not need to be turned, as is customary with hospital mattresses, for example.

Abstract

A laminated support for pressure-relief comprising multiple foam layers. The combinations of layers can comprise one or more layers of visco-elastic foam, highly resilient polyurethane foam, reticulated filter polyurethane foam, and the like.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • This application is a continuation of co-pending U.S. patent application Ser. No. 11/005,803 filed Dec. 7, 2004, which is a continuation of U.S. patent application Ser. No. 10/403,255, filed on Mar. 31, 2003, now issued as U.S. Pat. No. 7,507,468, which is a continuation of U.S. patent application Ser. No. 09/703,893, filed on Nov. 1, 2000, now issued as U.S. Pat. No. 6,541,094, which is a continuation of U.S. patent application Ser. No. 08/458,968, filed on Jun. 2, 1995, now issued as U.S. Pat. No. 6,159,574, which claims priority to United Kingdom Patent Application Number 9411120.0 filed on Jun. 3, 1994, and to United Kingdom Patent Application Number 9411504.5 filed on Jun. 9, 1994, the entire contents of all of which are incorporated herein by reference. This application is also a continuation of co-pending U.S. patent application Ser. No. 10/403,255, filed on Mar. 31, 2003, now issued as U.S. Pat. No. 7,507,468, which is a continuation of U.S. patent application Ser. No. 09/703,893, filed on Nov. 1, 2000, now issued as U.S. Pat. No. 6,541,094, which is a continuation of U.S. patent application Ser. No. 08/458,968, filed on Jun. 2, 1995, now issued as U.S. Pat. No. 6,159,574, which claims priority to United Kingdom Patent Application Number 9411120.0 filed on Jun. 3, 1994, and to United Kingdom Patent Application Number 9411504.5 filed on Jun. 9, 1994, the entire contents of all of which are incorporated herein by reference.
    • BACKGROUND OF THE INVENTION
  • 1. Technical Field
  • The invention relates to mattresses and cushions, and more particularly to supports made of visco-elastic material.
  • 2. Related Prior Art
  • Mattresses and cushions used every day in homes and hospitals are not well-suited for people requiring pressure-relief. In hospitals, for example, long-term patients often suffer from pressure sores.
    • SUMMARY OF THE INVENTION
  • Known supports made of standard polyurethane foam do not provide even or well-distributed support of a body reclining thereon because of the polyurethane material. Such known standard supports have a spring-like characteristic that tends to return an increased reactive force in response to increasingly large forces on the support. Moreover, the greater the deflection of the polyurethane support, the greater the reactive force provided by the standard support. This spring-like characteristic is undesirable in the case of long-term patient care because the points at which the greatest pressure occurs are the points at which pressure sores can be formed.
  • Changing the density of the standard polyurethane foam used in such known supports does not improve the performance of such known supports. For example, use of a lower density foam requires a thicker, bulkier cushion or mattress, which can easily become unwieldy or unstable, and can still result in pressure points because of the inherent spring-like nature of the polyurethane foams. Also, if a sufficiently large force is applied to a support made of low density polyurethane foam, it is possible that the force will “bottom out” or act through the support and onto whatever structure lies below or behind the support.
  • The present invention therefore seeks to provide improved supports, such as mattresses and cushions, for pressure-relief.
  • According to the present invention there is provided a laminated support for pressure-relief comprising at least two layers of foam adhered together, wherein at least one layer is a visco-elastic foam.
  • In one embodiment, the laminated support comprises two layers of visco-elastic foam adhered together, wherein one layer of visco-elastic foam has a greater hardness than the other layer. The laminated support may further comprise a layer of polyurethane foam adhered to the layers of visco-elastic foam.
  • In another embodiment, the laminated support comprises a single layer of visco-elastic foam and a single layer of polyurethane foam adhered together.
  • The visco-elastic properties of the laminated support respond to a combination of body weight and body temperature. In particular, visco-elastic foam supports tend to soften when heated, and therefore tend to soften in response to body heat. As a result, relatively hard visco-elastic material will initially firmly support a body lying thereon and will soften at the pressure points. Thus, the support subsequently gently molds to the form of the body, allowing pressure to be absorbed uniformly and distributed evenly across the support. This property is of particular benefit in the prevention and healing of pressure sores.
  • Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 shows a side view of a support embodying the present invention.
  • FIG. 2 shows a side view of a support that is an alternative embodiment of the present invention.
  • FIG. 3 shows a side view of a support that is a second alternative embodiment of the present invention.
  • FIG. 4 shows a side view of a support that is a third alternative embodiment of the invention.
  • FIG. 5 is a perspective view in partial cross section of the support shown in FIG. 1.
  • FIG. 6 is a perspective view in partial cross section of the support shown in FIG. 2.
  • FIG. 7 is a perspective view in partial cross section of the support shown in FIG. 3.
    •
  • Before one embodiment of the invention is explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting.
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • The support or cushion A shown in FIGS. 1 and 5 includes a bottom layer 1 of 40 mm thick visco-elastic foam having a density of 110 kg/m3 and a hardness of 30N, and a top layer 2 of 10 mm thick visco-elastic foam having a density of 85 kg/m3 and a hardness of 10N.
  • The support B shown in FIGS. 2 and 6 is well-suited for use as an overlay which can be placed on top of an existing mattress to provide extra comfort and pressure-relief. The overlay B includes a bottom layer 3 of 60 mm thick visco-elastic foam having a density of 83 kg/m3 and a hardness of 13N, and a top layer 4 of 10 mm thick visco-elastic foam having a density of 83 kg/m3 and a hardness of 10N. A support similar to the construction of support B could also be manufactured to include a bottom layer of 80 mm thick highly resilient polyurethane foam having a density of 35 kg/m3 and a hardness of 12N, and a top layer of 70 mm thick visco-elastic foam having a density of 82 kg/m3 and a hardness of 13N.
  • The support C shown in FIGS. 3 and 7 is well-suited for use as a mattress and includes a bottom layer 5 of 75 mm thick polyurethane foam having a density of 35 kg/m3, a middle layer 6 of 60 mm thick visco-elastic foam having a density of 83 kg/m3 and a hardness of 13N, and a top layer 7 of 10 mm deep visco-elastic foam having a density of 83 kg/m3 and a hardness of 10N.
  • Suitable polyurethane foams are manufactured by A/S Dan-Foam, 5560 Arup, Denmark. One example of a polyurethane foam has the manufacturer's code HE35S.
  • Similarly, suitable visco-elastic foams are made by A/S Dan-Foam, 5560 Arup, Denmark and sold under the trade mark TEMPUR. One such visco-elastic foam has the manufacturer's code T-85. A preferred range of density of the visco-elastic foam is 50 to 120 kg/m3.
  • For each of the above embodiments A, B, and C, the layers comprising the cushion, overlay or mattress, are adhered together using an enviromentally-friendly water-based adhesive such as SABA AQUABOND RSD™, a two-component water-based adhesive produced by SABA DINXPERLO BV, B-7090 AA DINXPERLO, Belgium. Hardness is to be measured 65% compression at 20° C.
  • For each of the above embodiments A, B, and C, the layers comprising the cushion, overlay or mattress, once the appropriate layers of foam have been adhered together, a 2 mm thick sheet 8 of a reticulated filter polyurethane foam is adhered to each outer face of the laminated support. This layer 8 is air permeable.
  • The support D illustrated by FIG. 4 includes a single layer of visco-elastic foam sandwiched between two layers of reticulated filter polyurethane foam. In particular, the support D includes a sheet of visco-elastic foam 9, which is sandwiched between two sheets of reticulated polyurethane foam 8. The sheet of visco-elastic foam 9 preferably has a thickness ranging from 50 mm to 150 mm, a density ranging from 50 kg/m3 to 120 kg/m3, and a hardness ranging from 10N to 30N measured at 65% compression at 20° C.
  • Any of the supports A, B, C, and D may be provided with an outer covering (not shown). Two examples of outer coverings are described below.
  • One example is a textile net cover followed by a removable outer fabric cover. The textile net cover eases the taking on and off of the fabric cover and is made from a specially treated textile which allows the foam layers to ‘breathe’ whilst preventing contamination of the foam layers by fluids. An example of such netting is the 100% cotton netting manufactured by BIDET & HORST GmbH & Co KG, D-4460Hörstel, Germany.
  • A second example of an outer covering is a waterproof, vapor-permeable cover made of base nylon fabric coated with polyurethane film. Preferably, this cover material is 0.25 mm thick, weighs 245 g/m2, and is constructed having a single sheet top surface, no joins, welded seams and a sealed zip flap. In addition, this cover may be pretreated with an anti-bacterial agent.
  • The laminated support of the present invention, when covered with the polyurethane coat nylon material ensures good hygiene for patients with incontinence. The elasticity of the cover allows the pressure-relieving properties of the visco-elastic foam to be unimpaired.
  • Laminated supports manufactured in accordance with the present invention allow air to circulate around a patient's skin and thus avoid the discomfort of perspiration and skin irritation.
  • The visco-elastic foam layers provide the laminated support with its special pressure-relieving properties. The support is thus able to mould according to the weight and temperature of a body in contact therewith. When the body is moved from a particular point of contact, the support quickly regains its initial shape, ready to be re-molded.
  • This property of the support is different from normally polyurethane foams which bulk up when compressed, thereby exerting pressure rather than relieving it. As a result, the quality of sleep of a person reclining on a support constructed of layers of foam having visco-elastic properties is different from normal polyurethane foams which bulk up when compressed, thereby exerting pressure rather than relieving it.
  • In use, it is the side of the support which has the visco-elastic foam layer, or the softest visco-elastic foam layer, foremost which is arranged for contact with a person's body. As a result, the support does not need to be turned, as is customary with hospital mattresses, for example.
  • Various features of the invention are set forth in the following claims.

Claims (27)

1. A layered bed mattress for pressure-relief of a user, the bed mattress comprising:
a first foam layer having a generally planar first support surface adapted to substantially face the user resting upon the bed mattress and having length and width dimensions sufficient to support a reclining body of a person, and a generally planar second surface opposite the first support surface, the first and second surfaces defining therebetween a substantially uniform undeflected thickness, the first foam layer comprising visco-elastic foam; and
a second foam layer having a generally planar third surface adjacent and substantially facing the second surface of the first foam layer, the second foam layer having a substantially uniform undeflected thickness greater than that of the first foam layer.
2. The layered bed mattress as claimed in claim 1, wherein the visco-elastic foam of the first foam layer is responsive to body heat from the user.
3. The layered bed mattress as claimed in claim 1, wherein the first foam layer is adhered to the second foam layer.
4. The layered bed mattress as claimed in claim 2, wherein the first foam layer is adhered to the second foam layer.
5. The layered bed mattress as claimed in claim 1, wherein the second foam layer has a hardness greater than that of the first foam layer.
6. The layered bed mattress as claimed in claim 2, wherein the second foam layer has a hardness greater than that of the first foam layer.
7. The layered bed mattress as claimed in claim 3, wherein the second foam layer has a hardness greater than that of the first foam layer.
8. The layered bed mattress as claimed in claim 4, wherein the second foam layer has a hardness greater than that of the first foam layer.
9. The layered bed mattress as claimed in claim 1, wherein the second foam layer comprises visco-elastic foam.
10. The layered bed mattress as claimed in claim 2, wherein the second foam layer comprises visco-elastic foam.
11. The layered bed mattress as claimed in claim 3, wherein the second foam layer comprises visco-elastic foam.
12. A layered bed mattress for pressure-relief of a user, the bed mattress comprising:
a first foam layer having a generally planar first support surface adapted to substantially face the user resting upon the bed mattress and having length and width dimensions sufficient to support a reclining body of a person, and a generally planar second surface opposite the first support surface, the first and second surfaces defining therebetween a substantially uniform undeflected thickness, the first foam layer comprising visco-elastic foam; and
a second foam layer having a generally planar third surface adjacent and substantially facing the second surface of the first foam layer, the second foam layer comprising visco-elastic foam.
13. The layered bed mattress as claimed in claim 12, wherein the visco-elastic foam of the first foam layer is responsive to body heat from the user.
14. The layered bed mattress as claimed in claim 12, wherein the first foam layer is adhered to the second foam layer.
15. The layered bed mattress as claimed in claim 13, wherein the first foam layer is adhered to the second foam layer.
16. The layered bed mattress as claimed in claim 12, wherein the second foam layer has a hardness greater than that of the first foam layer.
17. The layered bed mattress as claimed in claim 13, wherein the second foam layer has a hardness greater than that of the first foam layer.
18. The layered bed mattress as claimed in claim 14, wherein the second foam layer has a hardness greater than that of the first foam layer.
19. The layered bed mattress as claimed in claim 15, wherein the second foam layer has a hardness greater than that of the first foam layer.
20. A layered bed mattress for pressure-relief of a user, the bed mattress comprising:
a first foam layer having a generally planar first support surface adapted to substantially face the user resting upon the bed mattress and having length and width dimensions sufficient to support a reclining body of a person, and a generally planar second surface opposite the first support surface, the first and second surfaces defining therebetween a substantially uniform undeflected thickness, the first foam layer comprising visco-elastic foam; and
a second foam layer having a generally planar third surface adjacent and substantially facing the second surface of the first foam layer, the second foam layer having a density less than that of the first foam layer and a hardness greater than that of the first foam layer.
21. The layered bed mattress as claimed in claim 20, wherein the second foam layer is thicker than the first foam layer.
22. The layered bed mattress as claimed in claim 20, wherein the visco-elastic foam of the first foam layer is responsive to body heat from the user.
23. The layered bed mattress as claimed in claim 21, wherein the visco-elastic foam of the first foam layer is responsive to body heat from the user.
24. The layered bed mattress as claimed in claim 20, wherein the first foam layer is adhered to the second foam layer.
25. The layered bed mattress as claimed in claim 21, wherein the first foam layer is adhered to the second foam layer.
26. The layered bed mattress as claimed in claim 20, wherein the second foam layer comprises visco-elastic foam.
27. The layered bed mattress as claimed in claim 21, wherein the second foam layer comprises visco-elastic foam.
US12/407,605 1994-06-03 2009-03-19 Laminated visco-elastic support Abandoned US20090172887A1 (en)

Priority Applications (2)

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US12/407,605 US20090172887A1 (en) 1994-06-03 2009-03-19 Laminated visco-elastic support
US12/474,912 US8034445B2 (en) 1994-06-03 2009-05-29 Laminated visco-elastic support

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
GB9411120.0 1994-06-03
GB9411120A GB2290256B (en) 1994-06-03 1994-06-03 Laminated supports
GB9411504.5 1994-06-09
GB9411504A GB9411504D0 (en) 1994-06-09 1994-06-09 Supports having visco-elastic properties
US08/458,968 US6159574A (en) 1994-06-03 1995-06-02 Laminated visco-elastic support
US09/703,893 US6541094B1 (en) 1994-06-03 2000-11-01 Laminated visco-elastic support
US10/403,255 US7507468B2 (en) 1994-06-03 2003-03-31 Laminated visco-elastic support
US11/005,803 US8025964B2 (en) 1994-06-03 2004-12-07 Laminated visco-elastic support
US12/407,605 US20090172887A1 (en) 1994-06-03 2009-03-19 Laminated visco-elastic support

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US11/005,803 Continuation US8025964B2 (en) 1994-06-03 2004-12-07 Laminated visco-elastic support

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US12/474,912 Continuation US8034445B2 (en) 1994-06-03 2009-05-29 Laminated visco-elastic support

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US20090172887A1 true US20090172887A1 (en) 2009-07-09

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US12/407,605 Abandoned US20090172887A1 (en) 1994-06-03 2009-03-19 Laminated visco-elastic support
US12/474,912 Expired - Fee Related US8034445B2 (en) 1994-06-03 2009-05-29 Laminated visco-elastic support

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