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WO1992008397A1 - Matelas ou coussin pourvu d'une housse biocide - Google Patents

Matelas ou coussin pourvu d'une housse biocide Download PDF

Info

Publication number
WO1992008397A1
WO1992008397A1 PCT/GB1991/002012 GB9102012W WO9208397A1 WO 1992008397 A1 WO1992008397 A1 WO 1992008397A1 GB 9102012 W GB9102012 W GB 9102012W WO 9208397 A1 WO9208397 A1 WO 9208397A1
Authority
WO
WIPO (PCT)
Prior art keywords
mattress
water
cover
fabric
coating
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.)
Ceased
Application number
PCT/GB1991/002012
Other languages
English (en)
Inventor
John Barton
John Tracey Scales
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mediscus Products Ltd
Original Assignee
Mediscus Products Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mediscus Products Ltd filed Critical Mediscus Products Ltd
Publication of WO1992008397A1 publication Critical patent/WO1992008397A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • A47C27/002—Mattress or cushion tickings or covers
    • A47C27/005—Mattress or cushion tickings or covers liquid-impermeable
    • A47C27/006—Mattress or cushion tickings or covers liquid-impermeable breathable
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C31/00—Details or accessories for chairs, beds, or the like, not provided for in other groups of this subclass, e.g. upholstery fasteners, mattress protectors, stretching devices for mattress nets
    • A47C31/007—Anti-mite, anti-allergen or anti-bacterial means

Definitions

  • This invention relates to a mattress or cushion having a biocidal cover and to covers for such use.
  • a further measure which is sometimes taken is to subject covers to auto-claving in order to destroy the bacteria by heat sterilisation. Apart from being an expensive and laborious procedure, some materials do not easily withstand the temperatures involved in auto-claving treatment or are degraded by such treatment so that their useful life is shortened. Moreover, autoclaving does not guarantee that sterile conditions can be maintained over a sufficient period of use.
  • a mattress or cushion wherein the cover comprises a sheet material which is permeable to water-vapour but substantially impermeable to liquid water, said sheet material having a bacteriostat or bacterial substance incorporated within the material or contained in a coating on the inner surface.
  • the invention is based on the realisation that bacteria tend to migrate from an area of initial infection on droplets of water and/or microscopic particles of dust.
  • moisture from perspiration and other body fluids becomes trapped between the body and the supporting surface.
  • water-vapour passes through the cover to the interior because the water-vapour pressure is higher on the outside surface in the region between the patient and the surface, thus making the patient more comfortable.
  • water-vapour permeable fabrics or materials can be microporous, it is thought that bacteria will be carried through the fabric of the cover and this would lead to a spread of infection throughout the mattress or pillow.
  • a bacteriostat or bactericidal substance in the fibres of the fabric and/or in a coating on the inside surface of the cover, the pathogens can be controlled and the infection confined.
  • conventional washing of the outer surface or autoclaving of a mattress or pillow cover in accordance with the invention will enable cross- infection to be totally controlled.
  • Another important advantage is that since the bacteriostat or bactericidal substance is contained within the fabric or in a coating on the inner surface, removal of the bacteriostat or bactericidal substance by surface abrasion or topical washing is much reduced since it is protected within the fabric or in the inner coating.
  • incorporation of the anti-microbial agent within the cover or in a coating on its inner surface reduces the incidence of an allergic reaction arising from contact with the anti-microbial agent.
  • biocidal fibres are ones in which an inorganic bacteriostat such as zinc oxide and/or silver oxide is incorporated in the fibre during its manufacture.
  • the biocidal agent is incorporated in the fibre with a zeolite, which is believed to assist in firmly attaching the biocidal agent to the fibre.
  • Zeolites are hydrated alkali aluminium silicates having a highly porous structure.
  • bacteriostat or bactericidal materials especially for incorporation in a coating on the inner surface of the cover, include a trialkyl tin sulphosalicylate or N-trichloromethylthio-4-cyclohexene-1,2-dicarboximide, (available from R.T. Vanderbuilt Inc. of Norwalk, Conn, U.S.A., under the trade mark Vancide).
  • bacteriostat or bactericidal substances include hexachlorophene, chlorophenols, such as 6-chloro-2-phenyl phenol and Actmer biocidal agent available from Monsanto Chemical Co.
  • the mattress cover may be fitted over a core comprising a block of resilient, open-celled foam such as described in British Patent Nos. 2132083 and 2105,584.
  • the mattress may be "self-ventilated", in that the movement of a patient on the mattress causes water-vapour, passing into the interior through the water-vapour permeable cover to pass through the foam and to exit through a porous panel at the base, e.g. as described in British Patent No. 1,596,157. Because the cover is water- vapour permeable, such movements cause water-vapour to pass through the cover from the vicinity of the patient's body, and to pass out of the mattress through the sides or the base, e.g. through air passages formed in the foam.
  • this "pumping action” may cause bacteria supported on droplets of moisture or dust to be carried into the mattress cover where the biocidal or anti-microbial substance neutralises the bacteria, either within the fabric or in the coating on the inner surface.
  • the zeolite attracts particles of dust which are generally electrostatically charged and the zinc oxide and/or silver oxide or other biocidal agent kill the bacteria which are supported on the dust particles.
  • the water-vapour permeable material channels the bacteria through the membrane with the water vapour, whereupon the biocidal substance kills the bacteria.
  • the mattress core need not be of foam and may alternatively include springs or horsehair or other fibres.
  • Another method of enhancing the bactericidal effect is to weave the biocidal fibres into a fabric having a construction such that water droplets are wicked down into contact with the biocidal component of the fabric. This may involve weaving or knitting a hydrophilic fibre, e.g. cellulosic fibres into the fabric to enhance the wicking of the water droplets. Further details of such a construction will be given hereinafter in this specification.
  • cushion cover in this specification is used in a broad sense to include not only mattress covers of the traditional kind, e.g. as described in the above- cited British Patents Nos. 1,596,157 and 2,132,083, but also the covers of inflatable mattresses, e.g. of the kind in which a mattress is divided into compartments which are subjected to alternating pressure and also inflatable sacs of low air loss beds, e.g. of the kind described in U.K. Patents Nos. 1,341,325, 1,474,018 and European Patent No. 0,034,954.
  • alternating pressure inflatable mattresses e.g. of the kind described in British Patents Nos. 1,595,417 and U.S. Patent No. 4,391,009
  • air flow is much reduced in comparison with the low air loss bed.
  • the alternating pressure would tend to cause moisture to pass to some extent through a water-vapour permeable fabric mattress cover.
  • the covers or envelopes of alternating pressure mattresses may, with advantage, be constructed in accordance with this invention.
  • the biocidal fibres are a polyester, polyacrylamide or polyacrylonitrile fibre which is not hydrophobic and has sufficient temperature resistance for auto-claving.
  • the biocidal substance is preferably supported on zeolite and incorporated in finely-divided form in the spinning solution which is fed to the spinnerette.
  • There is no critical minimum limit for the amount of zeolite composition containing the biocidal material but, preferably, this should be not less than about 20% by weight and may be up to 50%.
  • the concentration of the biocidal substance depends on the particular substance selected. Typically, it may be 0.5 to 5%, preferably 0.5 to 2% by weight.
  • the biocidal fibres may be mixed with other fibres in the construction of the fabric but preferred material will contain at least 20% of biocidally active fibres.
  • One specific example of a procedure for incorporating a biocidal substance in fibres or into film to be coated onto fabric is described in U.S. Patent No. 3, 284,395.
  • a coating or spinning composition is prepared by adding about 5% by weight of a biocidal agent to a solution of a polymer of acrylonitrile.
  • the mattress may have a central core of foam and may be self-ventilated.
  • the mattress may include forced-ventilation, e.g. generated by an air blower as described in British Patent No. 1,443,759.
  • the biocidally active fibres may be woven together with a base fabric which is then coated with a water-vapour permeable membrane, e.g. a polyurethane coating or a silicone rubber membrane such as described in British patent No. 1,341,325.
  • a water-vapour permeable membrane e.g. a polyurethane coating or a silicone rubber membrane such as described in British patent No. 1,341,325.
  • the fabric may be coated with a hydrophilic polymer which on curing is water-vapour permeable as described in British patent No. 2,074,093.
  • the water-vapour permeable membrane may be laminated to a woven or knitted fabric containing the biocidally active substance.
  • the fabrics may be knitted or woven.
  • Water-vapour permeable materials which are useful in the practice of this invention have a permeability of at least about 230g/sq metre/24 hours at 37°C.
  • Fabrics having substantially higher water vapour transmission rates may be employed, e.g. having a permeability greater than 1000g/sq metre/24 hours. Permeabilities greater than 2000g/sq metre/24 hours are possible.
  • the fabric should be waterproof in contact with liquid water under a hydrostatic head of at least 250 mm of water (normally 1000 mm hydrostatic pressure) for at least 30 minutes when carrying out the test described in British Patent No. 2,024,100.
  • Water-vapour permeable fabrics are commercially available under the trade marks "Gortex” (from W.L. Gore & Assoc. Inc., Newark, Delaware, USA) and "Permatex" (from Carrington & Dewhurst Performance Fabrics).
  • a woven or knitted fabric preferably of polyamide, polyacrylic and/or polyester fibre
  • the polyurethane can be modified so that on curing it has a microporous structure through which the water-vapour may pass.
  • Polyurethane coating materials can be modified by including a hydrophilic polymer component. Such coatings are "chemically” porous towards water but not generally physically microporous.
  • An example of a commercially available coating material of this kind is "Witcoflex Staycool" supplied by Baxenden Chemical Co. of Droitwich, Worcester, United Kingdom. This coating material is not, however, total ly impermeable to bacteria and a biocidal substance may be incorporated in the coating.
  • a biocidal substance is incorporated in the water-vapour permeable (w.v.p.) coating
  • concentration of the biocidal agent in the coating composition may be from about 0.5 to 5% by weight, e.g. 0.5 to 2%.
  • Any suitable coating equipment may be used, e.g. a knife coater, set to deposit a thin coating on the surface which will form the inner surface of the mattress. Of course, both sides can be coated but generally it is sufficient to coat only one.
  • a coating weight is selected which will deposit a layer which is thinner than the base fabric. Typical coating weights are 5 to 20 g per square metre to yield a final cured w.v.p. layer of about 25 to 200 um, preferably 50 to 100 um. Curing is usually carried out by heating to about 175°C .
  • a fire-retardant substance into the fabric. This may be achieved by spraying the base fabric with a solution of the substance or by including it in the w.v.p. coating composition.
  • suitable fire-retardant substances are "Proban 210" marketed by Albright & Wilson Limited and "Pyrovatex CP” supplied by Ciba-Geigy Limited.
  • the fabric from which the cover is constructed is preferably a two-way stretch material.
  • the fabric In order to conform snugly to the foam plastics base, the fabric should extend by at least 30% in the width direction and at least 10% in the length direction when measured using a 3kg load in accordance with the test described in British Patent No. 2,105,584.
  • the attached Figure 1 illustrates typical laminates from which covers in accordance with the present invention may be manufactured.
  • reference numeral 1 indicates a water-vapour permeable membrane which may be formed by one of the procedures described in the above cited British patents.
  • One commercially-available water-vapour permeable film material is sold under the trade name "Platilon".
  • Other materials are generally available on a woven backing fabric, e.g. of polyamide or polyester.
  • the water-vapour permeable membrane is laminated to a fabric (2) which contains the biocidal fibres.
  • This fabric may be woven or knitted.
  • a knitted terry fabric with an upstanding pile is advantageous. This is because the pile can be used to wick moisture down into the fabric for intimate contact with the biocidal fibres.
  • the knitted terry fabric preferably has biocidal fibres forming the scaffold.
  • the biocidal fibres (which are normally polyester), may be used alone or blended with other fibres, e.g. of polyester, to form yarns from which the fabric is woven or knitted.
  • the water-vapour permeable (w.v.p.) layer 1 can be laminated to the fabric 2 by calendaring the composition from which the w.v.p. layer is formed onto the biocidal fabric 2.
  • the w.v.p. membrane may be preformed and then laminated to the biocidal base fabric.
  • Figure 2 shows diagrammatically in cross-section a cushion of a low air loss bed.
  • the cushion is shaped to extend widthwise of the bed and arranged together with other similar cushions to form a patient supporting surface.
  • an inlet 20 is provided for connection to an air supply and provision is made for air to exhaust from the cushion at one or more other points in order to create an air flow through the interior of the cushion.
  • the resulting air change maintains a water-vapour pressure within the cushion which is less than that at the contact area between the patient and the support surface.
  • the cushion may include a shaped foam block 18 so that when the cushion is deflated, the patient is supported on a foam base.
  • Reference numeral 21 indicates a strap arranged to prevent the foam block being displaced.
  • Figure 2A is a view on an enlarged scale of part of the membrane forming the cover of the cushion.
  • the membrane comprises a close-woven fabric 30 on the outside of the cushion and an adherent w.v.p. coating 31 on the inner surface.
  • Coating 31, in this embodiment, is microporous but as explained above, the water-vapour permeability characteristics may derive from the inclusion of hydrophilic comonomers in the polymeric coating.
  • Anti-microbial characteristics are imparted to the membrane by including biocidal fibres in the fabric 30 and/or a bacteriostat in the polymeric coating 31.

Landscapes

  • Mattresses And Other Support Structures For Chairs And Beds (AREA)

Abstract

On décrit une housse de matelas ou de coussin, la housse étant fabriquée à partir d'un tissu pour drap perméable à la vapeur d'eau, mais pratiquement imperméable à l'eau sous une forme liquide, ledit tissu pour drap comprenant une substance bactéricide ou bactériostatique qui y est incorporée ou contenue dans un revêtement appliqué à la surface interne du drap.
PCT/GB1991/002012 1990-11-16 1991-11-15 Matelas ou coussin pourvu d'une housse biocide Ceased WO1992008397A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909024990A GB9024990D0 (en) 1990-11-16 1990-11-16 Mattress having biocidal cover
GB9024990.5 1990-11-16

Publications (1)

Publication Number Publication Date
WO1992008397A1 true WO1992008397A1 (fr) 1992-05-29

Family

ID=10685519

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/002012 Ceased WO1992008397A1 (fr) 1990-11-16 1991-11-15 Matelas ou coussin pourvu d'une housse biocide

Country Status (3)

Country Link
AU (1) AU8877591A (fr)
GB (2) GB9024990D0 (fr)
WO (1) WO1992008397A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8491923B2 (en) 2003-11-26 2013-07-23 Lanxess Deutschland Gmbh Method for controlling fungi and mites in textile substrates
WO2025106808A1 (fr) * 2023-11-15 2025-05-22 Stryker Corporation Couverture pour support de patient

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9202344D0 (en) * 1992-02-04 1992-03-18 Walker John Cover structure
GB2300806A (en) * 1995-05-01 1996-11-20 Tilly Christie Liquid absorbent bedding
BE1009900A5 (nl) * 1995-12-28 1997-10-07 Sogilo Nv Bedekkingsartikel voor bedden en dergelijke, en werkwijze voor het vervaardigen ervan.
ES2127683B1 (es) * 1996-05-22 1999-12-16 Betere Fab Lucia Antonio Mejoras introducidas en conjuntos base-colchon para camas.
US6240879B1 (en) * 1997-04-15 2001-06-05 Seefar Technologies, Inc. Amusement articles possessing microbe-inhibiting properties
EP1192885A1 (fr) * 2000-10-02 2002-04-03 The Procter & Gamble Company Drap jetable perméable à la vapeur d'eau, imperméable aux liquides et contenant des agents actifs pour articles de literie
EP1192886A1 (fr) * 2000-10-02 2002-04-03 The Procter & Gamble Company Drap jetable perméable à la vapeur d'eau, imperméable aux liquides et ayant des propriétés déodorantes pour articles de literie
FR2866534B1 (fr) * 2004-02-24 2006-04-07 G Et C Sa Couverture de protection isolante contre le froid et hygienique notamment a usage medicalise
FR2907646B1 (fr) * 2006-10-26 2009-02-06 Hill Rom Ind S A Sa Dispositif et procede de regulation de l'humidite a la surface d'une element de support du type matelas.
ITVE20080082A1 (it) * 2008-11-11 2010-05-11 Noble Biomaterials Europ Srl Procedimento per realizzare un' imbottitura antibatterica e prodotto così ottenuto.
IT1397239B1 (it) 2009-12-01 2013-01-04 Zecca Sistema per accogliere un utente seduto o sdraiato.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284395A (en) * 1965-07-26 1966-11-08 Dow Chemical Co High acrylonitrile polymer solutions containing a mixture of monochlorinated orthophenylphenols
GB1341325A (en) * 1971-07-09 1973-12-19 Scales J T Inflatable support appliance
GB1596158A (en) * 1977-11-08 1981-08-19 Nat Res Dev Matress covers
GB2105584A (en) * 1981-07-17 1983-03-30 Courtaulds Plc Fire resistant support for the human body
US4525409A (en) * 1983-09-19 1985-06-25 Flexi-Mat Corporation Nylon or polyester treated fabric for bedding
GB2235872A (en) * 1989-09-12 1991-03-20 Slumberland Plc Support appliances and cover therefor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284395A (en) * 1965-07-26 1966-11-08 Dow Chemical Co High acrylonitrile polymer solutions containing a mixture of monochlorinated orthophenylphenols
GB1341325A (en) * 1971-07-09 1973-12-19 Scales J T Inflatable support appliance
GB1596158A (en) * 1977-11-08 1981-08-19 Nat Res Dev Matress covers
GB2105584A (en) * 1981-07-17 1983-03-30 Courtaulds Plc Fire resistant support for the human body
US4525409A (en) * 1983-09-19 1985-06-25 Flexi-Mat Corporation Nylon or polyester treated fabric for bedding
GB2235872A (en) * 1989-09-12 1991-03-20 Slumberland Plc Support appliances and cover therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8491923B2 (en) 2003-11-26 2013-07-23 Lanxess Deutschland Gmbh Method for controlling fungi and mites in textile substrates
WO2025106808A1 (fr) * 2023-11-15 2025-05-22 Stryker Corporation Couverture pour support de patient

Also Published As

Publication number Publication date
GB9124357D0 (en) 1992-01-08
GB9024990D0 (en) 1991-01-02
GB2248774A (en) 1992-04-22
AU8877591A (en) 1992-06-11

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