AU621754B1 - Creación de Inventos y Patentes con Inteligencia Artificial

AU621754B1 – Wound dressing
– Google Patents

AU621754B1 – Wound dressing
– Google Patents
Wound dressing

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Info

Publication number
AU621754B1

AU621754B1
AU55760/90A
AU5576090A
AU621754B1
AU 621754 B1
AU621754 B1
AU 621754B1
AU 55760/90 A
AU55760/90 A
AU 55760/90A
AU 5576090 A
AU5576090 A
AU 5576090A
AU 621754 B1
AU621754 B1
AU 621754B1
Authority
AU
Australia
Prior art keywords
wound dressing
pad
dressing according
strip
sheet
Prior art date
1989-02-23
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
AU55760/90A
Inventor
Trevor John Andrews
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.)

Ultra Laboratories Ltd

Original Assignee
Ultra Laboratories 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.)
1989-02-23
Filing date
1990-05-22
Publication date
1992-03-19

1990-05-22
Application filed by Ultra Laboratories Ltd
filed
Critical
Ultra Laboratories Ltd

1992-03-19
Application granted
granted
Critical

1992-03-19
Publication of AU621754B1
publication
Critical
patent/AU621754B1/en

1995-12-14
Assigned to ULTRA LABORATORIES LIMITED
reassignment
ULTRA LABORATORIES LIMITED
Alteration of Name(s) in Register under S187
Assignors: ULTRA LABORATORIES LIMITED

2010-05-22
Anticipated expiration
legal-status
Critical

Status
Ceased
legal-status
Critical
Current

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Classifications

A—HUMAN NECESSITIES

A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE

A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS

A61F13/00—Bandages or dressings; Absorbent pads

A61F13/02—Adhesive plasters or dressings

A61F13/0203—Adhesive plasters or dressings having a fluid handling member

A—HUMAN NECESSITIES

A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE

A61F13/00—Bandages or dressings; Absorbent pads

A61F2013/00361—Plasters

A61F2013/00365—Plasters use

A61F2013/00387—Plasters use skin protection

A61F2013/004—Plasters use skin protection from liquid water

A—HUMAN NECESSITIES

A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE

A61F13/00—Bandages or dressings; Absorbent pads

A61F2013/00361—Plasters

A61F2013/00727—Plasters means for wound humidity control

A61F2013/00731—Plasters means for wound humidity control with absorbing pads

A61F2013/0074—Plasters means for wound humidity control with absorbing pads containing foams

A—HUMAN NECESSITIES

A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE

A61F13/00—Bandages or dressings; Absorbent pads

A61F2013/00361—Plasters

A61F2013/00727—Plasters means for wound humidity control

A61F2013/00731—Plasters means for wound humidity control with absorbing pads

A61F2013/00744—Plasters means for wound humidity control with absorbing pads containing non-woven

A—HUMAN NECESSITIES

A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE

A61F13/00—Bandages or dressings; Absorbent pads

A61F2013/00361—Plasters

A61F2013/00855—Plasters pervious to air or vapours

A61F2013/00863—Plasters pervious to air or vapours with pores

A—HUMAN NECESSITIES

A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE

A61F13/00—Bandages or dressings; Absorbent pads

A61F2013/00361—Plasters

A61F2013/00855—Plasters pervious to air or vapours

A61F2013/00885—Plasters pervious to air or vapours impervious, i.e. occlusive bandage

A61F2013/00889—Plasters pervious to air or vapours impervious, i.e. occlusive bandage waterproof

A—HUMAN NECESSITIES

A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE

A61F13/00—Bandages or dressings; Absorbent pads

A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators

A61F13/84—Accessories, not otherwise provided for, for absorbent pads

A61F13/8405—Additives, e.g. for odour, disinfectant or pH control

A61F2013/8408—Additives, e.g. for odour, disinfectant or pH control with odour control

A61F2013/842—Additives, e.g. for odour, disinfectant or pH control with odour control with active charcoal

Abstract

The invention provides a wound dressing comprising a pad (1) of soft polyurethane foam one surface layer (2) of which is hydrophilic and a backing layer (3) of which is hydrophobic and a sheet or strip (4) of a soft conformable polyether foam having an adhesive (5) on one surface thereof. The surface of said pad (1) opposite the hydrophilic layer (2) is secured to said sheet or strip (4) by said adhesive (5) and said sheet or strip overlaps said pad (1) to enable the pad (1) to be secured in position with said hydrophilic layer (2) in contact with a wound by means of said adhesive (5).

Description

AUSTRALIA 7 4 PATENTS ACT 1952 Form COMPLETE SPECIFICATION
(ORIGINAL)
i FOR OFFICE USE Short Title: I Int. C1: Application Number: ILodged: Complete Specification-Lodged: i Accepted: S0 Lapsed: j Published: Priority: Related Art: TO BE COMPLETED BY APPLICANT Name of Applicant: ULTRA LABORATORIES LIMITED Address of Applicant: TRIBUNE DRIVE, SITTINGBOURNE, KENT ME10 2PG,
ENGLAND
S’ Actual Inventor: Address for Service: GRIFFITH HACK CO., 601 St. Kilda Road, Melbourne, Victoria 3004, Australia.
Complete Specification for the invention entitled: WOUND DRESSING The following statement is a full description of this invention including the best method of performing it known to me:- WOUND DRESSING The present invention relates to wound dressings.
It is known from United Kingdom Patent Specifications Nos. 1417962 and 1450201 to provide a wound dressing comprising a pad of polyurethane material one surface layer of which has been modified to render it hydrophilic and the remainder of which is hydrophobic. Such wound dressings are used by placing the pad over the wound with 0ot C* the hydrophilic surface of the pad in contact with the 0, wound and then securing the pad in place by adhesive S’ strapping or by bandaging thereover. It is also known from United States Patent No. 4730611 to provide a wound dressing comprising a foamed polyurethane as aforesaid oI Oo positioned on a porous non-woven fibrous sheet of a larger selected size and having an adhesive on the side t contacting the hydrophobic side of said pad so that the dressing presents the hydrophilic side and the adhesive for use in’contact with a wound and the area surrounding the wound.
With wound dressings of the kind aforesaid it is desirable that the hydrophilic surface of the pad remain in close contact with the wound to remove exudates and to promotir healing. With the known wound dressings this is 2 difficult to achieve, particularly where the wound dressing is applied to an area subject to considerable movement such as an elbow joint or a knee joint, since conventional adhesive strapping and conventional bandaging either do not hold the pad in close contact with the wound over an extended period of time or can quickly work loose. The wound dressing comprising a polyurethane pad positioned on a porous non-woven fibrous sheet in accordance with the aforesaid 0000 oo United States patent has little elasticity and therefore does °oo not readily conform for any extended period of time to oo o. difficult areas such as elbow joints and knee joints.
o oo 000 0 S00 oo o It is also desirable that a wound dressing should be impervious to water to enable a patient to bathe or shower without wetting or contaminating the wound but at the same 000 time should be sufficiently porous to enable moisture to 00,0 0 0 0, 00 evaporate therethrough to maintain an environment under the 00 0 U dressing which will promote rapid healing of a wound. These requirements are not met by the known wound dressings.
00 00 o0 o0 0o 0o 0 The present invention therefore has as its object to provide a wound dressing which will overcome the limitations of the known wound dressings, which is highly conformable even to difficult areas of the body such as elbow joints or r knee joints, which is water impermeable and which will allow moisture to evaporate therethrough.
L 3 The present invention provides a wound dressing comprising a pad of polyurethane foam one surface of which is hydrophilic and a backing layer of which is hydrophobic and a sheet or strip of a soft conformable polyether foam having an adhesive on one surface thereof, the surface of said pad opposite said hydrophilic layer being secured to said sheet or strip by said adhesive and said sheet or strip overlapping I said pad to enable said pad to be secured in position with fife f t said hydrophilic layer in contact with a wound by means of said adhesive.
4 4 it 9 44 Said sheet or strip may overlap said pad on two opposite i sides thereof although it is preferred that the sheet or strip overlap said pad around the whole of the periphery thereof.
4 4 4 1 A release paper or film may be applied over said adhesive, said release paper or film being removable prior to application of the wound dressing over a wound.
Said pad may have a thickness from 3 to 10mm, preferably from 4 to 6mm.
Said pad may be compressed around the periphery.
Preferably, the compressed region extends inwardly from to 10mm from the edge, suitably 6mm to 8mm from the edge.
Preferably, the periphery is compressed to have a thickness of from 0.1mm. suitably from 0.2 mm to 0.6 mm.
4 Said sheet or strip may be formed from a high density polyetherurethane foam, preferably a predominantly closed cell blocked toluene di-isocyanate polyetherurethane foam. Said polyetherurethane foam may have a pore size of 0.1 to 0.6 mm. The sheet or strip may have an elongation of 200% to 300%, preferably 240% to 270%. The sheet or strip may have a thickness of 0.2 to 1.0 mm, preferably 0.4 to 0.8 mm.
0 00.. The said adhesive is preferably an acrylic adhesive *c «0 but may be any of the other adhesives approved for 0 S medical use.
o 0 If desired, said pad may comprise at or adjacent said opposite surface thereof a layer impregnated with ooooo activated carbon for adsorbing organic odours. Thus, 0oo0 o00°0, said impregnated layer may comprise a layer of non-woven .0 0 viscose fibres on to which activated carbon granules have been sprayed. Said impregnated layer may be sandwiched between said she .t or strip and the hydrophobic backing layer of the pad or between two layers of hydrophobic polyurethane foam. Dressings comprising such an impregnated layer are useful when dressing wounds which give off an offensive odour as is the case, for example, with certain leg ulcers,
-I-
The wound dressing of the present invention may, in conventional manner, be sterile and be packaged in a sterile pack. For example said dressing and said pack may have been sterilised by gamma irradiation after packaging of the dressing of said pack.
The invention will be more particularly described with reference to the accompanying drawings, in which o0Q0 o 0 oFigure 1 is an isometric view of a wound dressing 0 according to the present invention, 0 00 00o 0 Figure 2 is a fragmentary sectional elevation on an enlarged scale of the wound dressing of Figure 1, 0*4 Figure 3 is a fragmentary sectional elevation on an 00 enlarged scale of a modified wound dressing according to the o00 present invention.
+Figure 4 is a fragmentary sectional elevation of another Ic modification of a wound dressing according to the invention; and Figure 5 is a fragmentary sectional elevation of a further embodiment of a wound dressing according to the invention.
Referring to Figure 1 and 2 of the drawings it will be seen that the wound dressing illustrated therein comprises a pad 1 of soft polyurethane foam one surface C i i L -i- 6 layer 2 of which is hydrophilic and the remainder of which is hydrophobic and forms a backing layer 3 and a sheet or strip 4 of a soft conformable polyether foam having an adhesive 5 on one surface thereof, the surface of the hydrophobic layer 3 being secured to the sheet or strip 4 by said adhesive 5 and the sheet or strip 4 overlapping the pad 1 as shown at 6 to enable the pad 1 to be secured in position with the hydrophilic layer 2 in 0 contact with a wound means of the adhesive 5. As will be seen 000 from Figure 1, the sheet or strip 4 overlaps the pad 1 around oo Oo the whole of the periphery thereof. A release paper or release o 0, film 7, indicated by broken lines in Figure 1, is applied over 000 ooo a oo the adhesive 5 ani over the pad 1 and is removable prior to application of the dressing over a wound.
0 000 °oooo The pad 1 has a thickness of from 3 to 10 mm, preferably 4 oo to 6 mm.
o i l Referring to the embodiment shown in Figure 5, the pad 1 is 0 preferably compressed around its periphery. The compressed regin 9 may extend inwardly for 5 mm to 10 mm from the edge, suitably 6 mm to 8 mm from the edge. Preferably, the periphery is compressed to have a thickness of from 0.1 to 1,0 mm, suitably from 0.2 to 0.6 mm.
Compressing the periphery of the pad 1 increases the effective border width without increasing overall dimensions or 6a reducing the pad 1 area, to enable a more secure fixation of the wound dressing on the patient. Further, the release papers 7 thereby sits flat across the full width of the adhesive surfaces.
The compression of the periphery of the pad 1 is achieved prior to assembly of the wound dressing. The pad 1 is placed, with the hydrophilic surface layer 2 uppermost, centrally onto a forming tray with a cut out 14 mm smaller in all dimensions. The forming tray and wound dressing are then placed onto the lower, unheated, platen of a heat press. The lower platen is raised at a pressure in the range of 50′ to 5000N/m 2 preferably 500 to 1500N/m 2 against the upper platen which is heated to a temperature of 140 0 C to 250 0 C, preferably 1800C to 2000C. After S a period of time, preferably between 10 seconds and 90 seconds suitably about 20 seconds the pressure is released and the bottom platen lowered. The wound dressing so produced will have a periphery reduced in thickness.
The sheet or strip 4 in either embodiment is formed from a high density predominantly closed cell blocked toluene diisocyanate polyetherurethane foam. Preferably, the polyetherurethane foam from which the sheet or strip 4 is formed has a pore size of 0.1 to 0.6 mm and an elongation of 200% to
I
l -i i- F Y.I 7 300%, preferably to 24% to 27%. The sheet or strip 4 may have a thickness of from 0.2 to 1.0mm, preferably from 0.4 to 0.8mm. The corners of the sheet or strip 4 are preferably rounded, to prevent them from lifting up when the wound dressing is in use.
The adhesive 5 is an acrylic adhesive although other adhesives approved for medical u~e may be used if desired.
The wound dressing illustrated in Figures I and 2 is highly conformable to different parts of the body, even to difficult parts such as elbow joints or knee joints, is waterproof so that a patient wearing the dressing can bathe or shower without danger of wetting or contaminating a wound and is sufficiently porous to enable moisture to evaporate therethrough.
f.
t As shown in Figures 3 and 4, in which like parts have been given like reference numerals, in the pad i, in either embodiment may include a layer 8 of non-woven fibres, eg., viscose fibres, impregnated with granules of activated carbon. Thus, as shown in Figure 3, the layer 8 may be provided between the hydrophobic layer 3 and the layer of adhesive 5 or, as shown in Figure 4, the layer 8 may be sandwiched between hydrophobic layers 3a, 3b of the pad i. A dressing incorporating the layer 8 is particularly useful 8 for dressing wounds which give off an offensive odour, as is the case, for example, with certain leg uloers and other wounds.
00 6 0 00 0 0 *4 00

Claims (18)

1. A wound dressing comprising a pad 1 of soft polyurethane foam one surface layer 2 of which is hydrophilic and a backing layer 3 of which is hydrophobic and a sheet or strip 4 of a soft conformable polyether foam having an adhesive 5 on one surface thereof, the surface of said pad 1 opposite said hydrophilic layer 2 being secured to said sheet or strip 4 by said adhesive and said sheet or strip 4 overlapping said pad 1 to enable said pad 1 to be secured in position with said hydrophilic layer 2 in fi’ I contact with a wound by means of said adhesive

2. A wound dressing according to claim 1, wherein said sheet or strip 4 overlaps said pad 1 on two opposite sides thereof. 0000 0 0 0 0 0 0 0

3. A wound dressing according to claim 1, wherein said sheet or strip 4 overlaps said pad 1 around the whole of the periphery thereof. t 1

4. A wound dressing according to claim 1, 2 or 3, wherein a release paper or film 7 is applied over said adhesive 5, said release paper or film 7 being removable prior to application of the wound dressing over a wound.

A wound dressing according to any one of the preceding claims, wherein said pad 1 has a thickness of from 3 to 10 mm.

6. A wound dressing according to any one of the preceding claims wherein said pad 1 has a thickness of from 4 to 6 mm.

7. A wound dressing according to any one of the preceding claims, wherein said pad 1 is compressed around the periphery.

8. A wound dressing according to claim 7, wherein the compressed region extends inwardly for 5 mm to 10 mm from the edge of the pad 1.

9. A wound dressing according to claim 7 or 8 wherein the periphery is compressed to have a thickness of from 0.1 mm to mm.

A wound dressing according to any one of the preceding claims, wherein said sheet or strip 4 is formed from a high density polyetherurethane foam.

11. A wound dressing according to claim 10, wherein sed sheet or strip 4 is formed from a predominantly closed cell blocked toluene di-isocyanate polyetherurethane foam. i

12. A wound dressing according to claim 10 or 11, wherein said polyetherurethane foam has a pore size of 0.1 to 0.6 mm.

13. A wound dressing according to claim 10, 11 or 12, wherein said sheet or strip 4 has an elongation of 200% to 300%.

14. A wound dressing according to any one of the preceding claims, wherein said sheet or strip 4 has a thickness of from 0.2 to 1.0 mm.

A wound dressing according to any one of the preceding claims, wherein said adhesive 5 is an acrylic adhesive.

16. A wound dressing according to any one of the preceding claims, wherein said pad 1 comprises at or adjacent said opposite surface thereof a layer 8 impregnated with activated carbon for adsorbing organic odours.

17. A wound dressing according to claim 16, wherein said impregnated layer 8 comprises a layer of non-woven viscose fibres on to which activated carbon granules have been sprayed.

18. A wound dressing according to claim 16 or 17, wherein said impregnated layer 8 is sandwiched between two layers of hydrophobic polyu-rethane foam. DATED TIIIS 22ND DAY OF MAY 1990 ULTRA LABORATORIES LIMITED By its Patent Attorneys: GRIFFITH HACK CO., Fellows Institute of Patent Attorneys of Australia

AU55760/90A
1989-02-23
1990-05-22
Wound dressing

Ceased

AU621754B1
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

GB8904131A

GB2228682B
(en)

1989-02-23
1989-02-23
Wound dressing

Publications (1)

Publication Number
Publication Date

AU621754B1
true

AU621754B1
(en)

1992-03-19

Family
ID=10652186
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

AU55760/90A
Ceased

AU621754B1
(en)

1989-02-23
1990-05-22
Wound dressing

Country Status (10)

Country
Link

US
(1)

US5154928A
(en)

EP
(1)

EP0457977B1
(en)

AT
(1)

ATE118683T1
(en)

AU
(1)

AU621754B1
(en)

CA
(1)

CA2017683C
(en)

DE
(1)

DE69017199T2
(en)

DK
(1)

DK0457977T3
(en)

ES
(1)

ES2071017T3
(en)

GB
(1)

GB2228682B
(en)

GR
(1)

GR3015841T3
(en)

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DK
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active

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1982-07-21
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1996-09-12
Kimberly-Clark Worldwide, Inc.
Self-adhesive nonwoven elastic compressible composite material

Also Published As

Publication number
Publication date

EP0457977A1
(en)

1991-11-27

GR3015841T3
(en)

1995-07-31

DE69017199T2
(en)

1995-07-27

GB2228682B
(en)

1992-08-12

US5154928A
(en)

1992-10-13

DK0457977T3
(en)

1995-03-27

GB8904131D0
(en)

1989-04-05

EP0457977B1
(en)

1995-02-22

ATE118683T1
(en)

1995-03-15

CA2017683A1
(en)

1991-11-28

GB2228682A
(en)

1990-09-05

CA2017683C
(en)

1994-09-06

DE69017199D1
(en)

1995-03-30

ES2071017T3
(en)

1995-06-16

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