|Publication number||US20090172887 A1|
|Application number||US 12/407,605|
|Publication date||Jul 9, 2009|
|Filing date||Mar 19, 2009|
|Priority date||Jun 3, 1994|
|Also published as||US8025964, US8034445, US20050084667, US20090293199|
|Publication number||12407605, 407605, US 2009/0172887 A1, US 2009/172887 A1, US 20090172887 A1, US 20090172887A1, US 2009172887 A1, US 2009172887A1, US-A1-20090172887, US-A1-2009172887, US2009/0172887A1, US2009/172887A1, US20090172887 A1, US20090172887A1, US2009172887 A1, US2009172887A1|
|Inventors||Dag Landvik, Michael B. Allaway|
|Original Assignee||Dag Landvik, Allaway Michael B|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (9), Classifications (20), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
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.
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.
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.
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.
The support or cushion A shown in
The support B shown in
The support C shown in
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
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.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7950084 *||Dec 17, 2009||May 31, 2011||King Koil Licensing Company, Inc.||Multi-layer mattress with an air filtration foundation|
|US8025964||Dec 7, 2004||Sep 27, 2011||Tempur World, Llc||Laminated visco-elastic support|
|US8034445||May 29, 2009||Oct 11, 2011||Tempur-Pedic Management, Inc.||Laminated visco-elastic support|
|US8997279||Mar 12, 2012||Apr 7, 2015||King Koil Licensing Company, Inc.||Multi-layer mattress with an air filtration foundation|
|US20050084667 *||Dec 7, 2004||Apr 21, 2005||Tempur World, Inc.||Laminated visco-elastic support|
|US20130025070 *||Jan 31, 2013||Dreamwell, Ltd.||Mattress assembly with high airflow|
|US20150182031 *||Dec 31, 2013||Jul 2, 2015||Ida T. Jensen||Cover assemblies for mattresses|
|WO2014105047A1 *||Dec 28, 2012||Jul 3, 2014||Tempur-Pedic Management, Llc.||Foam block mattress assemblies|
|WO2015019199A1 *||Jan 14, 2014||Feb 12, 2015||Dan-Foam Aps||Body support|
|U.S. Classification||5/740, 5/690|
|International Classification||A47C27/00, B32B5/18, B32B7/02, A47C27/15|
|Cooperative Classification||Y10T428/249991, Y10T428/249992, Y10T428/249981, Y10T428/249953, B32B7/02, Y10T428/2495, Y10T428/24983, Y10T428/24992, Y10T428/233, A47C27/15, B32B5/18|
|European Classification||A47C27/15, B32B5/18, B32B7/02|
|Apr 27, 2009||AS||Assignment|
Owner name: TEMPUR-PEDIC MANAGEMENT, INC., KENTUCKY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TEMPUR WORLD, LLC;REEL/FRAME:022596/0496
Effective date: 20080915
|Jul 18, 2011||AS||Assignment|
Owner name: BANK OF AMERICA, N.A., AS COLLATERAL AGENT, ILLINO
Free format text: SECURITY INTEREST;ASSIGNOR:TEMPUR-PEDIC MANAGEMENT, INC.;REEL/FRAME:026610/0416
Effective date: 20110628
|Jul 19, 2011||AS||Assignment|
Owner name: TEMPUR WORLD, LLC, KENTUCKY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ALLAWAY, MICHAEL B;REEL/FRAME:026636/0728
Effective date: 20050923
Owner name: TEMPUR WORLD, LLC, KENTUCKY
Free format text: CHANGE OF NAME;ASSIGNOR:TEMPUR WORLD, INC.;REEL/FRAME:026616/0832
Effective date: 20031229
Owner name: TEMPUR WORLD, INC., KENTUCKY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FAGERDALA WORLD FOAMS AB;REEL/FRAME:026614/0986
Effective date: 20010801
Owner name: FAGERDALA WORLD FOAMS AB, SWEDEN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LANDVIK, DAG;REEL/FRAME:026614/0917
Effective date: 19950815
|Mar 20, 2013||AS||Assignment|
Owner name: TEMPUR-PEDIC MANAGEMENT, LLC, KENTUCKY
Free format text: RELEASE OF LIEN ON PATENTS;ASSIGNOR:BANK OF AMERICA, N.A., AS DOMESTIC COLLATERAL AGENT;REEL/FRAME:030139/0552
Effective date: 20130318