WO2010087968A1 - Couvre-matelas anatomique régularisé par pression - Google Patents

Couvre-matelas anatomique régularisé par pression Download PDF

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Publication number
WO2010087968A1
WO2010087968A1 PCT/US2010/000240 US2010000240W WO2010087968A1 WO 2010087968 A1 WO2010087968 A1 WO 2010087968A1 US 2010000240 W US2010000240 W US 2010000240W WO 2010087968 A1 WO2010087968 A1 WO 2010087968A1
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WO
WIPO (PCT)
Prior art keywords
overlay
expanse
foam
coating
cell
Prior art date
Application number
PCT/US2010/000240
Other languages
English (en)
Inventor
Casey A. Dennis
Michael R. Dennis
Original Assignee
Mjd Innovations, L.L.C.
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 Mjd Innovations, L.L.C. filed Critical Mjd Innovations, L.L.C.
Publication of WO2010087968A1 publication Critical patent/WO2010087968A1/fr

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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
    • A47C27/14—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays
    • 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

Definitions

  • the present invention pertains to a special-purpose, special-capability, breathable, moisture-controlling, anatomical-support, pressure-evenizing, "mattress overlay” intended to be placed on top of, and used in conjunction with, an underlying, yieldable support surface, such as that provided by a mattress, for the purpose of furnishing "direct", pressure-evenizing under-support for a substantially bed-ridden person. It is specifically designed, as will be explained more fully below, with a thinness suitable, with appropriate, yieldable under-support, for handling persons weighing up to about 250-lbs. It is definitively not designed to be used alone as a support on top of any rigid, underlying surface; nor is it intended to be a "stand-alone" support structure, such as a mattress, per se.
  • the herein-proposed overlay has an important, intentional, preferred quality of relative thinness preferably (no more than about 1 -inches), and this important thinness quality militates against its utilization respecting the "not-designed-for" uses just mentioned.
  • the term "bedridden” as used herein as a "person characterization” is intended broadly to include a wide range of differently convalescing persons who may spend significant amounts of extended, body-support time not only specifically in hospital beds, but also in conjunction with other bed-like mattress structures.
  • the proposed "mattress overlay” has as its special purpose the dramatic minimization, and in many instances the complete prevention, of the onset and development of decubitus ulcers(sores) — medical conditions that lead to dangerous and potentially lethal injuries which come from long-term body- rest/support conditions. Accordingly, the overlay of the present invention is naturally, and particularly, well suited for placement on top of conventional, long-term, person/patient-support mattresses, such as hospital-bed mattresses.
  • the defining term "mattress overlay” is intended herein to refer to any overlay structure constructed in accordance with the special and unique features of the present invention which may be shaped, sized, etc., for use not only on top of an underlying, conventional mattress structure, per se, but also in other similar environments where nonambulatory people, such as convalescing patients, may lie recurrently supported for long periods of time.
  • the decubitus ulcer problem is recognized today as being one of the most serious problems facing hospital and medical-care facilities, and these skilled care facilities are openly waging a fierce battle with state and federal agencies and insurance companies over who should pay the enormous costs in the treatment of this "new epidemic.”
  • protuberance-support areas are the ones that potentially define the greatest risk for decubitus-ulcer development, and as we have discovered, are the areas where the most robust ventilating airflow needs to exist.
  • the present invention in its structural character, takes the form of an anatomical pressure-evenizing mattress overlay including (a) a dynamic-response, preferably uniform-thickness core expanse having spaced, upper and lower, surfaces and a perimetral edge extending between these surfaces, formed of a 100% open-cell, uniform-density compressible and flowable, viscoelastic foam, and having a "relaxed-state" volume in the overlay which is prestressed, by being about 8-10% compressed, to create a pre-compression condition in the expanse, and (b) an elastomeric, moisture-resistant, gas-breathable vinyl coating, which is load- transmissively, interfacially bonded to the entirety of the outside surface area of the core expanse to function as a dynamically-responsive unit with the expanse, with this coating possessing a "relaxed-state", internal, prestressed tension condition which is responsible for the prestressed compression condition in the core expanse.
  • a dynamic-response
  • the core expanse is specifically and preferably formed of a specific-character, solid-phase, single-component, single-density, polyurethane material, shaped with its upper and lower surfaces substantially equidistant (i.e., the core expanse has preferably a uniform thickness) to give the overlay, as a whole, a substantially uniform thickness of no more than about 1 -inches, with the coating having a contributing thickness throughout of only about 0.015-inches.
  • the coating is formed preferably with fifteen, approximately 0.001 -inches thick, cured, sublayers, spray-applied, one over another, under circumstances where the "previously applied", next-spray-receiving layer is still wet and not yet cured.
  • This layer-generating approach produces, structurally, a final, cured, layered coating having, between all next-adjacent sublayers, what we refer to structurally herein as being finally cured, but initially wet, interfacial surfaces of joinder.
  • the overlay per se, which is elongate and generally planar in nature, has no preferential upper or lower end, and no preferential top or bottom face, or side. It can, accordingly, confidently be placed with any suitable orientation on an appropriate supporting under-structure.
  • the overlay structure of the invention further includes, for the coating-covered core expanse, a removeably f ⁇ ttable/installable, generally form-fitting, allover composite-fabric jacket having an upper-surface portion formed of a selected, lower- friction material, and a lower-surface portion formed of a selected, higher friction material.
  • the lower-friction material is formed of a woven polyester fabric
  • the higher-friction material is formed of a polyurethane-coated, polyester-knit fabric.
  • composite-fabric is used herein to refer to the differentiated-fabric-material character of the jacket.
  • the invention involves a method for furnishing pressure-evenized, dynamic-reaction support for the anatomy including (a) supporting the anatomy with a 100% open cell, polyurethane, viscoelastic foam, and following such supporting, and within the supporting foam, reacting therein to both static and dynamic, anatomical-unevenness-produced indentations in the foam to expand and contract foam cell-openness size, whereby deeper and sharper foam indentations result in greater cell-openness size.
  • Fig. 1 is a simplified, isometric view of an anatomical pressure-evenizing mattress overlay constructed in accordance with a preferred and best-mode embodiment of the present invention resting upon a fragmentarily shown hospital-bed mattress, and with a portion of one corner of the illustrated overlay broken away to illustrate details of internal construction.
  • Fig. 2 is a larger scale, fragmentary, cross-sectional view taken generally along the line 2-2 in Fig. 1.
  • Fig. 3 is an even larger-scale, fragmentary illustration of the region generally embraced by the two curved arrows 3-3 in Fig. 2.
  • Fig. 4 is a simplified, fragmentary view, drawn on about the same scale which is employed in Fig. 2, illustrating anatomical, load-bearing response of the overlay of Figs. 1-3, inclusive, and especially showing how the dynamic-response core of the overlay of the present invention responds to such loading.
  • Fig. 5 is a simplified, isometric view, drawn on about the same scale as that which is employed in Fig. 1, illustrating an installable/removable fabric jacket having differentiated upper and lower jacket portions, designed, in a form-fitting fashion, to receive, and to be employed with, the overlay structure of Figs. 1-4, inclusive.
  • Overlay 10 herein has an overall thickness of about 1 -inches (a preferred maximum thickness), a lateral width of about 36-inches, and a length of about 75-inches.
  • Overlay 10 is formed, basically, from two different components, or portions, including a single-piece, dynamic-response core expanse 12, and an elastomeric, air-breathable, moisture-resistant coating 14 which, as will shortly be explained, is load-transmissively (mechanically), interfacially (face-to-face) bonded to the entirety of the outside broad-planar and edge surface area of expanse 12.
  • Figs. 1 and 2 overlay 10 is shown resting upon a hospital-bed mattress of conventional construction shown generally and fragmentarily only at 16 in these two drawing figures.
  • the mattress overlay of this invention need not necessarily be used in the setting of a conventional, hospital, bedding mattress, but may also be used, appropriately perimetrally shaped, to fit into other environments involving convalescing patients. In all instances, it is important that the mattress overlay of this invention be supported upon a mattress-like support, or other, similar, suitably yieldable understructure in order to prevent core expanse 12 from bottoming out.
  • the about 1 -inches thickness proposed herein as being preferable for the core expanse has been chosen for several reasons, one of which is that, when properly under-supported, and as above described, it will readily handle a person weighing about 250-lbs, and will also successfully deal, without bottoming out, with notably projecting, angular portions of the anatomy even involving persons of such weight.
  • an especially heavy person for example someone who weighs more than about 250-pounds and up to about 450-lbs, is to be supported in accordance with practice of the invention, it is important that the overlay not be placed upon a hard and non-yielding undersurface, or be used alone as a mattress with stiff under-support. Such conditions could easily lead to bottoming out.
  • this foam 12 is formed of a 100% open-cell, single-density, viscoelastic foam most preferably made from the product known as #5010 CF Visco, polyurethane, Domfoam made by Domfoam International, Inc. in Montreal Quebec, Canada.
  • This foam is both compressible and flowable.
  • this foam which has been chosen for the core expanse has another, very important, internal structural character whereby, under changing compression-pressure conditions, it exhibits a compressive-deflection vs. compression-force curve which includes an extremely linear region over which a relatively wide change in compressive deflection is accompanied by what turns out to be an anatomically insignificant (i.e., only slightly perceptible) change in compression pressure.
  • This feature plays a very important role in assuring evenized support pressure applied statically and dynamically to the underside of a supported anatomy, notwithstanding the presences of, say, any bony anatomical protrusions.
  • core expanse 12 within the overall structure of overlay 10 is in a pre-stressed compressed condition, with a "relaxed-state" compression internally of about 8-10%.
  • This compression is brought about by virtue of the presence of allover overcoating by coating 14 which is a multi-sublayered, sprayed-on vinyl coating prepared with an overall thickness of about 0.015-inches from a vinyl material preferably that made and sold by PlastiDip International in Blaine, MN under the identity Miraculon PDF- 830.
  • coating 14 is prepared with fifteen 0.001 -inches thickness layers in a special manner to ensure two of several important features of the overcoating, one of which is that special inter-sublayer joinder exists between each of the sprayed-on sublayers to improve air-breathability of the coating, and another of which is to create a coating which, when completed, demonstrates a controlled shrinkage which is responsible for placing core expanse 12 into compression, and the coating into a prestressed, tensed condition.
  • Fig. 3 a fragment of the fifteen- sublayer construction of coating 14 is illustrated.
  • this figure one can see several of these sublayers, including a final outer sublayer 14a, a next adjacent sublayer 14b, and in interfacial bond 14c which lies between sublayers 14a, 14b.
  • This interfacial bond is referred to herein as "initially wet", interfacial surfaces of joinder.
  • coating 14 is then applied in fifteen, successive spraying operations wherein the very thin vinyl sublayers that ultimately make up the entirety of coating 14 are applied, one after another in a succession whereby each "next-adjacent" sublayer is sprayed onto the receiving sublayer under circumstances with the vinyl material in the latter (i.e., the receiving sublayer) still in a wet and not fully cured state.
  • This important preparation consideration results in the resulting structural joinder which develops in the interfacial region between the individual sublayers in coating 14 offering improved breathability in the final structure of coating 14, and further, promoting appropriately controlled shrinkage of coating 14 as a whole to create the different pre- stressed compression and tension conditions mentioned above for the core expanse and the coating, respectively.
  • thin application of the first-to-be-sprayed-on sublayers in coating are then applied in fifteen, successive spraying operations wherein the very thin vinyl sublayers that ultimately make up the entirety of coating 14 are applied, one after another in a succession whereby each "next-adjacent" sublayer is
  • this bonding condition produces an "in-use" action, extremely important in the behavior of overlay 10, wherein expansive stretching of the coating, such as that which occurs, for example, when the anatomy, and particularly a sharp, anatomical protuberance therein, depresses the overlay support surface (see arrow 18 in these two drawing figures), pulls on the bonded core expanse, and causes (a) core-openness size in that pulled-on and resultingly expanded, core-expanse region to enlarge, and (b) airflow openness in the coating to increase locally, thus immediately promoting increased airflow capability and activity in that region. Prestress compression in the core expanse importantly aids in this action, since that compression urges the core expanse to swell non-resistively, and expand.
  • This "depression/bulging" condition is characterized, of course, by an expanding and stretching of the coating at the 14 A, 14B locations therein, and attendant increasing of the there-local airflow permeability of the coating.
  • This expanding and stretching causes related, outward, lateral “dragging” of the bonded core expanse, aided in that "dragging” by the relaxation of compression in that expanse.
  • the squeezing which results in the core expanse between locations 14A, 14B produces slight, lateral, outward flowing of the expanse as indicated by arrows 20, 22, with outwardly flowed core expanse-material represented in the two, angular, lightly shaded region of that expanse shown at 24. 26.
  • Fig. 5 indicated generally at 28 is a removeably fittable/installable, generally form-fitting, allover composite-fabric, freely air/gas- breathable jacket having an upper-surface portion formed of a selected, lower- friction material, and a lower-surface portion formed of a selected, higher friction material, which jacket may be used under certain circumstances now to be explained as a receiving jacket for overlay 10.
  • jacket 28 is especially useful in circumstances where it is desired that the lower side, effectively, of the overlay have a higher- frictioning quality so that slippage on top of an underlying support structure, such as a hospital-bed mattress, cannot easily occur, and at the same time that the upper side, effectively, of the overlay have a notably lower-friction quality so that a patient lying on the overlay may easily be adjusted in position by gentle sliding on the overlay if and when it becomes necessary to change patient position.
  • jacket 28 is formed with differentiated-material upper and lower surface portions 30, 32 which furnish these differentiated frictioning qualities.
  • upper surface, lower- friction portion 30 is formed of a freely air/gas-breathable, woven, polyester fabric, made by Global Textile Partners based in Gloversville, NY, and identified as TF-64 Polyester.
  • This material very adequately provides for a low-friction surface next to the skin or bedding/clothing materials, and helps to minimize friction and shear forces on the skin. Additionally, it aids caregivers by allowing for easier sliding transfers of patients who are unable to reposition themselves. Further, it also provides a high-rate wicking material next to or near the skin — a feature which aids in removal of potentially problem-generating moisture.
  • the lower surface, higher-friction portion 32 is formed of a polyurethane- coated, polyester-knit fabric, made by Harrison Technologies, Inc., in Broadalbin, New York, and identified as Pigskin-Knew-Tek Polyurethane.
  • jacket 28 The upper and lower surface portions, or components, in jacket 28 are suitably edge joined, with at least a portion (three lateral sides herein) of edge joinder being created through a zipper structure, such as that generally indicated at 34.
  • a zipper structure such as that generally indicated at 34.
  • jacket 28 has been illustrated with one end part of the upper component unzipped, so to speak, from the lower component, and folded back somewhat to provide insertion and removal access for overlay 10 which is illustrated fragmentarily by a dashed line in Fig. 5.
  • a suitable bariatric under-support structure should be employed.
  • this structure will have essentially the same perimetral outline as that of the supported overlay, and will furnish appropriate yieldable under-support to prevent bottoming out of the core expanse in the supported overlay.
  • an anatomical pressure-evenizing mattress overlay including (1) a dynamic-response core expanse having spaced, upper and lower, surfaces and a perimetral edge extending between these surfaces, formed of a 100% open-cell, compressible and fiowable, viscoelastic foam, and having a relaxed- state volume in the overlay which is prestressed, and about 8-10% compressed, thus to create a pre-compression condition in the expanse, and (2) an elastomeric, moisture-resistant coating, load-transmissively bonded to the entirety of the outside of the core expanse to function as a dynamically-responsive unit with the expanse, and possessing a relaxed-state internal prestressed tension condition.
  • the core expanse exhibits a compressive-deflection vs. compression-force curve which includes an extremely linear region over which a relatively wide change in compressive deflection is accompanied by an anatomically insignificant change in compression pressure.
  • the overlay of the invention further optionally includes, for the coating- covered core expanse, a removeably fittable/installable, generally form-fitting, allover composite-fabric jacket having an upper-surface portion formed of a selected, lower- friction material, and a lower-surface portion formed of a selected, higher friction material.
  • the methodology of the invention features a method for furnishing moisture- removing, pressure-evenized, dynamic-reaction support for the anatomy, including the steps of (a) supporting the anatomy with a 100% open cell viscoelastic foam, and (b) following such supporting, and within the supporting foam, reacting therein to both static and dynamic, anatomical-unevenness-produced indentations in the foam to expand and contract cell-openness size, whereby deeper and sharper indentations result in greater cell-openness size.
  • the reacting step includes laterally stretching and laterally flowing regions of the foam adjacent such indentations.
  • the unique structure of the present mattress overlay includes a special core foam material which is completely 100% open-celled in nature, and which is nominally under compression, coated by a very thin, moisture-resistant, gas-breathable elastomeric layer which is bonded tenaciously (interfacially, mechanically bonded) to the entire surface of core foam.

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  • Invalid Beds And Related Equipment (AREA)

Abstract

L'invention porte sur un procédé et une structure destinés à fournir un support anatomique à réaction dynamique, régularisé par pression. Le procédé comprend le support de l'anatomie par une mousse viscoélastique à cellules ouvertes à 100 %, puis, dans la mousse, la réaction aux indentations de la mousse, tant statiques que dynamiques générées par l'anatomie, afin de dilater et contracter la taille d'ouverture des cellules, ce par quoi des indentations plus profondes/plus pointues conduisent à une ouverture de cellule de taille supérieure. Une telle réaction comprend l'étirement et le fluage latéraux des régions de la mousse adjacentes à une telle indentation. La structure de recouvrement est caractérisée par une dilatation du cœur à réponse dynamique formé d'une mousse viscoélastique, en polyuréthane, compressible et fluable, à cellules ouvertes à 100 % possédant un volume à l'état relâché et comprimé et un revêtement élastomère résistant à l'humidité, à transmission de charge, lié en interface à la totalité de la surface extérieure de dilatation du cœur afin de fonctionner en tant qu'unité à réponse dynamique à la dilatation. Le revêtement possède un état de tension de précontrainte à l'état relâché grâce auquel existe l'état comprimé de la dilatation.
PCT/US2010/000240 2009-01-28 2010-01-27 Couvre-matelas anatomique régularisé par pression WO2010087968A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US20612609P 2009-01-28 2009-01-28
US61/206,126 2009-01-28

Publications (1)

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WO2010087968A1 true WO2010087968A1 (fr) 2010-08-05

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WO (1) WO2010087968A1 (fr)

Families Citing this family (4)

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US9119754B2 (en) * 2011-10-08 2015-09-01 Michael Dennis Mattress overlay system with positionally adjustable, lateral ramp-wedge bolster structure
US10537186B2 (en) 2011-11-01 2020-01-21 Denver Mattress Co., Llc Upcycled mattress nucleus of essential foam elements
US20140048080A1 (en) * 2012-03-02 2014-02-20 Michael Dennis Anatomical external pressure management methods
US9615984B2 (en) * 2014-03-11 2017-04-11 Herniamesh S.R.L. Treatment of chronic back pain using a three-dimensional monofilament mattress overlay

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