GB2380945A - Multi-layered wound dressing - Google Patents
Multi-layered wound dressing Download PDFInfo
- Publication number
- GB2380945A GB2380945A GB0225544A GB0225544A GB2380945A GB 2380945 A GB2380945 A GB 2380945A GB 0225544 A GB0225544 A GB 0225544A GB 0225544 A GB0225544 A GB 0225544A GB 2380945 A GB2380945 A GB 2380945A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layer
- wound
- dressing
- exudate
- absorbent layer
- 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.)
- Granted
Links
- 230000002745 absorbent Effects 0.000 claims abstract description 41
- 239000002250 absorbent Substances 0.000 claims abstract description 41
- 230000005540 biological transmission Effects 0.000 claims abstract description 27
- 238000003892 spreading Methods 0.000 claims abstract description 8
- 230000007480 spreading Effects 0.000 claims abstract description 8
- 210000000416 exudates and transudate Anatomy 0.000 claims description 31
- 238000002803 maceration Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims 2
- 239000010410 layer Substances 0.000 description 49
- 206010052428 Wound Diseases 0.000 description 40
- 208000027418 Wounds and injury Diseases 0.000 description 40
- 239000004753 textile Substances 0.000 description 9
- 239000000853 adhesive Substances 0.000 description 8
- 230000001070 adhesive effect Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 229920000297 Rayon Polymers 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229920003043 Cellulose fiber Polymers 0.000 description 4
- 239000012790 adhesive layer Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical compound O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 2
- 229940072056 alginate Drugs 0.000 description 2
- 229920000615 alginic acid Polymers 0.000 description 2
- 235000010443 alginic acid Nutrition 0.000 description 2
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 2
- 238000009960 carding Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 125000002791 glucosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)[C@H](O1)CO)* 0.000 description 2
- 150000004676 glycans Chemical class 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920001282 polysaccharide Polymers 0.000 description 2
- 239000005017 polysaccharide Substances 0.000 description 2
- 229920006264 polyurethane film Polymers 0.000 description 2
- 239000011496 polyurethane foam Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- KIUKXJAPPMFGSW-DNGZLQJQSA-N (2S,3S,4S,5R,6R)-6-[(2S,3R,4R,5S,6R)-3-Acetamido-2-[(2S,3S,4R,5R,6R)-6-[(2R,3R,4R,5S,6R)-3-acetamido-2,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-2-carboxy-4,5-dihydroxyoxan-3-yl]oxy-5-hydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylic acid Chemical compound CC(=O)N[C@H]1[C@H](O)O[C@H](CO)[C@@H](O)[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@H](O[C@H]2[C@@H]([C@@H](O[C@H]3[C@@H]([C@@H](O)[C@H](O)[C@H](O3)C(O)=O)O)[C@H](O)[C@@H](CO)O2)NC(C)=O)[C@@H](C(O)=O)O1 KIUKXJAPPMFGSW-DNGZLQJQSA-N 0.000 description 1
- 229920001661 Chitosan Polymers 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 208000025865 Ulcer Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229920002674 hyaluronan Polymers 0.000 description 1
- 229960003160 hyaluronic acid Drugs 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000037311 normal skin Effects 0.000 description 1
- 239000001814 pectin Substances 0.000 description 1
- 235000010987 pectin Nutrition 0.000 description 1
- 229920001277 pectin Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000004627 regenerated cellulose Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 231100000397 ulcer Toxicity 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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 bandages or dressings
- A61F13/0203—Adhesive bandages or dressings with fluid retention members
-
- 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 bandages or dressings
- A61F13/023—Adhesive bandages or dressings wound covering film layers without a fluid retention layer
-
- 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
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Materials For Medical Uses (AREA)
Abstract
A multi-layered wound dressing comprising: (a) an absorbent layer (2) having high absorbency but low lateral wicking rate; and (b) a transmission layer (6) having a high moisture vapour transmission rate overlying the side of said absorbent layer furthest from the wound. A spreading layer (4) having a high lateral wicking rate may be interposed between the absorbent and transmission layers.
Description
<Desc/Clms Page number 1>
Multi layered Wound Dressing The present invention relates to a multi layered wound dressing particularly, but not exclusively, for use as a dressing on highly exudating wounds.
It is known to make wound dressings for use on heavily exudating wounds from materials with a high moisture vapour transmission rate (MVTR). Such dressings rely on exudate being taken up by the dressing and spread across much of the surface area of the dressing in order to ensure sufficient moisture evaporation. Examples of such dressings are ALLEVYN marketed in adhesive or non-adhesive versions by Smith and Nephew or TIELLE marketed by Johnson and Johnson. Such dressings are not designed to absorb and retain the exudate but manage the exudate by allowing the moisture present in the exudate to evaporate - A dressing said to have a high rate of moisture evaporation is described in EP 304 536A. The dressing disclosed in this document has a flexible hydrophilic layer that absorbs exudate, sandwiched between two layers of adhesive. The absorbent layer additionally contains a fabric layer which is intended to improve the structural integrity of the dressing once it is exposed to exudate.
A disadvantage of such dressings is that the lateral wicking of exudate is not contained and can cause normal skin surrounding the wound to macerate. A further disadvantage of such dressings is that the rapid loss of exudate can cause the wound to desiccate.
EP-A 0538917 discloses a vented wound dressing is disclosed comprising a thin conformable sheet material (12) at least a portion of the surface area of which is intended for placement as a dressing over a wound, which portion carries a pressure-sensitive adhesive coating (14) on one surface thereof for adhering the dressing to skin, the coating being applied to provide repeating areas (16) of the sheet material containing no adhesive, at least a portion of the repeating areas of no adhesive having slits (18) extending through the thickness thereof to permit transfer or wound fluids through the sheet material unimpeded by presence of adhesive material which can clog the slits and thereby inhibit fluid transfer therethrough.
There is thus a need for a wound dressing which is capable of absorbing exudate at the rate it is produced by a heavily exudating wound and which also does not cause
<Desc/Clms Page number 2>
maceration to the skin surrounding the wound thereby increasing the wear time of the dressing.
We have now developed a multi layered wound dressing which alleviates the above problems and there is provided by a first embodiment of the present invention a multi layered wound dressing comprising: (a) an absorbent layer having high absorbency but low lateral wicking; (b) a transmission layer having a high MVTR overlying the side of said absorbent layer furthest from the wound.
We have found that wound dressings according to the invention may mitigate the problems associated with the management of high levels of exudate produced by some wounds yet not induce maceration in the skin surrounding the wound. It is thought that this is achieved by the combined use of the absorbent layer with low lateral wicking, which readily absorbs exudate and transmits it to the transmission layer.
In a second embodiment of the invention the dressing further comprises a high lateral wicking layer between the absorbent and transmission layers which aids the spread of exudate across a greater area of the dressing but away from the wound. In this way exudate is spread across a large surface area to provide sufficient moisture vapour transmission but in a location distant from the wound and skin. The passage of exudate through the dressing is therefore in a"T"shape where the lateral spread is limited in the absorbent layer and maximised in the transmission layer. Such a mechanism avoids maceration of
<Desc/Clms Page number 3>
the skin surrounding the wound since the exudate is not contained in contact with the skin. As the absorbent layer does however retain exudate in the immediate region of the wound, desiccation of the wound is avoided. This allows longer wear time for the patient and less disturbance of the wound on dressing change.
A second embodiment of the invention of the present invention provides a multi layered wound dressing comprising: (a) an absorbent layer having high absorbency but low lateral wicking ; (b) a transmission layer having a high MVTR overlying said absorbent layer; and (c) a spreading layer having high lateral wicking positioned between the. transmission and absorbent layers, the spreading layer overlying the side of the absorbent layer furthest from the wound.
The absorbent layer is present to transport wound fluid away from the wound and absorb it while containing lateral spread of exudate. By high absorbency in the context of the present invention is meant an absorbency of at least lOg/g preferably from 15g/g to 50g/g and most preferably an absorbency of from 20g/g to 50g/g. By low lateral wicking is meant a lateral wicking rate of less than 20mm/60s preferably from lmm/60s to 15mm/60s and most preferably a lateral wicking rate of from lmm/60s to 10mm/60s. The absorbent layer is preferably fibrous and most preferably comprises gel-forming fibres. We have found that fibrous layers as opposed to polymeric absorbent layers have the advantage that they are especially able to gel block which
<Desc/Clms Page number 4>
resists the lateral spread of exudate. In addition exudate is absorbed rapidly and retained under pressure.
The fibres suitable for use in the absorbent layer of the present invention include hydrophilic fibres, which upon the uptake of wound exudate become moist and slippery or gelatinous and thus reduce the tendency for the surrounding fibres to adhere to the wound. The fibres can be of the type, which retain their structural integrity on absorption of exudate or can be of the type, which lose their fibrous form and become a structureless gel or a solution on absorption of exudate.
The gel forming fibres are preferably spun sodium carboxymethylcellulose fibres, chemically modified cellulosic fibres, in particular carboxymethylated cellulose fibres as described in PCT WO/9312275 to Courtaulds Pic or GB93/01258 to Courtaulds Plc, pectin fibres, alginate fibres and particularly those as described in W094/17227 to E. R. Squibb and Sons or EP 433354 to CV Laboratories Ltd or EP 476756 to CV Laboratories Ltd, or composite fibres of alginate and polysaccharide such as those described in EP 0892863 to Bristol-Myers Squibb Company, chitosan fibres, hyaluronic acid fibres, or other polysaccharide fibres or fibres derived from gums. The cellulosic fibres preferably have a degree of substitution of at least 0.05 carboxymethyl groups per glucose unit.
The production of solvent-spun cellulose fibres is described for example in US-A-4246221 and US-A-4196281 as well as in PCT WO/9312275 mentioned above.
Preferably the gel forming fibres for use in the present invention have an absorbency of either water or saline of at least 15 g/g as measured in the free swell absorbency method, more preferably at least 25 g/g or 50 g/g. The degree of substitution of the gel forming fibre is
<Desc/Clms Page number 5>
preferably at least 0.2 carboxymethyl groups per glucose unit, more preferably between 0.3 and 0. 5. The tenacity of the fibre is preferably in the range 25-15 cN/tex.
The gel forming fibres are preferably mixed to give a dressing comprising fibres of different absorbencies and also different absorbency rates and profiles. This can improve the strength and integrity of the absorbent layer in a wet or moist state.
The absorbent layer may comprise other fibres such as textile fibres which can be natural or synthetic but are preferably cellulosic fibres for example viscose rayon, multi-limbed viscose, cotton, or regenerated cellulose or fibres having a higher absorbency than most textile fibres such as the multi-limbed cellulose fibres as described in EP-A-301874. In general textile fibres absorb liquids by capillary action and are not hygroscopic this means that their absorbencies as measured by the free swell absorbency test are low such as less than 1 gram of liquid per gram of fibre.
More preferably the dressing comprises an intimate blend of gel forming fibres and cellulosic fibres in the range of 50% to 95% of textile fibres and 5% to 50% of gel forming fibres by weight. Preferably the dressing comprises a blend of fibres in the range of 65% to 80% textile fibres and 20% to 35% gel forming fibres by weight and most preferably 20% gel forming fibres and 80% textile fibres by weight.
The fibres suitable for use in the present invention can be processed using conventional textile machinery, for example by the staple route including cutting, carding and if desired crimping, drafting and spinning.
The spread layer of the present invention is preferably a
<Desc/Clms Page number 6>
net that has a high lateral wicking rate such as at least 30mm/60s, preferably 30mm/60s to 60mm/60s. Preferably the net is viscose polyester net such as that sold as scrim.
Other nets made from composite plastic/viscose material, which are also hydrophilic, would also be suitable.
The transmission layer of the present invention is preferably a layer having a MVTR of at least 3000 g m-2 measured by the method described in 1993 BP Appendix XX J1 or in the range of from 1000gm-2 to lOOOOgm-2. The transmission layer may be in the form of film/foam laminate, for example expanded polyurethane foam laminated to a polyurethane film.
The dressing may also comprise additional optional layers such as an adhesive layer for adhering the dressing to the skin surrounding the wound or a soluble medicated film applied to the wound contact layer for administering a pharmaceutically active ingredient to the wound or an odour absorbing layer such as an activated carbon layer for reducing the odour from malodorous wounds. The adhesive layer may be applied to the side of dressing closest to the wound and may be provided with perforations to assist transport of exudate through the dressing. The adhesive layer may also be applied to any of the other layers to provide an island configuration.
Preferred embodiments of the present invention will now be described by way of example with reference to the accompanying drawings, in which: Fig 1 is a schematic diagram of one embodiment of a multi layered wound dressing according to the invention ; and Fig 2 shows a sectional view of the dressing of Fig 1 taken on the line AA.
<Desc/Clms Page number 7>
Referring now to Fig 1 0 : the drawings the multi layered dressing comprises an absorbent layer (2), a spread layer (4) and a transmission layer (6). The absorbent layer is made from a 80/20 blend of cellulose fibres of the viscose rayon type with gel forming fibres such as those described in W093/12275 to Courtaulds and sold as a fibrous dressing in the product AQUACEL ex ConvaTec. The spread layer is a net with high lateral wicking capability such as OCD ex
BSF non-wovens and the transmission layer is a polyurethane foam/film laminate.
The dressing will typically be made in three sizes, 55mm
X55mm square, 105 X 105mm square and 205 X 105 mm rectangular, all dressings being about 2. Smm thick.
The dressing is placed on a wound, for example an ulcer, with the absorbent layer in contact with the wound.
Wound dressings in accordance with the present invention may reduce maceration and provide a longer wear time than known dressings.
Preferred embodiments of the invention will now be illustrated in the following examples.
Example 1 A multi layered dressing according to the invention was made by blending the textile and gel-forming fibres in a 50/50 blend via mixing through a pre-opener and carding machine. The blended fibres were then cross-folded to the correct density, approximately lOOg/m2, and needle-punched to provide appropriate tensile strength, at least 4N/cm for the final non-woven absorbent layer. The various layers as described for the embodiment of the invention shown in
<Desc/Clms Page number 8>
Figure 1 were placed on top of one another and heat sealed together.
Optionally an adhesive was applied by extrusion in the correct dimensions onto silicone release paper and then transferred onto the absorbent layer of the dressing, either prior to or subsequent to the lamination process. In this way the adhesive is keyed into the absorbent layer via conventional pressure/heat lamination techniques.
The dressings were press cut or roller cut from the laminated web.
Example 2 The MVTR of the dressing of Example 1 was measured as 750g/m2/24hr or 1520g/m2/48hr.
The MVTR of a dressing according to Example 1 but with an absorbent layer having an 80/20 blend of textile to gelling fibres was measured as 600g/m2/24hr or 1410g/m2/48hr MVTR was measured via the BP method referenced above.
Claims (4)
- CLAIMS 1. A multi layered wound dressing comprising an absorbent layer and a transmission layer, characterised in that the lateral spread of exudate is contained in the absorbent layer and transmitted to the transmission layer so that the passage of exudate through the dressing follows a"T"shape.
- 2. A multi layered wound dressing, which comprises an absorbent layer, a transmission layer and a spreading layer overlying the side of the absorbent layer furthest from the wound, wherein the lateral spread of exudate is limited in the absorbent layer and maximised in the transmission layer to follow a"T"shape.
- 3. Use of an absorbent layer and a transmission layer in the preparation of a wound dressing to provide a"T"shaped profile to the passage of exudate through the dressing to treat or prevent maceration of skin surrounding the wound.
- 4. Use of a combination of(a) an absorbent layer having a high absorbency but low lateral wicking ; ZD tD and (b) a transmission layer having a high MVTR in the manufacture of a multi-layer wound dressing further comprising: (c) a spreading layer having a high lateral wicking rate sandwiched between the other two layers to treat or prevent maceration of skin surrounding the wound.4. Use of a combination of (a) an absorbent layer having a high absorbency but low lateral wicking; and (b) a transmission layer having a high MVTR in the manufacture of a multi-layer wound dressing further comprising: (c) a spreading layer having a high lateral wicking rate sandwiched between the other two layers to treat or prevent maceration of skin surrounding the wound.<Desc/Clms Page number 10>Amendments to the claims have been filed as follows1. A multi layered wound dressing comprising an absorbent layer and a transmission layer, characterised in that the lateral spread of exudate is contained in the absorbent layer and transmitted to the transmission layer so that the passage of exudate through the dressing follows a"T"shape.2. A multi layered wound dressing, which comprises an absorbent layer, a transmission layer and a spreading layer overlying the side of the absorbent layer furthest from the wound, wherein the lateral spread of exudate is limited in the absorbent layer and maximised in the spreading and transmission layers to follow a"T"shape.3. Use of an absorbent layer and a transmission layer in the preparation of a wound dressing to provide a"T"shaped profile to the passage of exudate through the dressing to treat or prevent maceration of skin surrounding the wound.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9900348.5A GB9900348D0 (en) | 1999-01-09 | 1999-01-09 | Multi layered wound dressing |
| GB0105607A GB2357436B (en) | 1999-01-09 | 2000-01-07 | Multi-layered wound dressing |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0225544D0 GB0225544D0 (en) | 2002-12-11 |
| GB2380945A true GB2380945A (en) | 2003-04-23 |
| GB2380945B GB2380945B (en) | 2003-06-04 |
Family
ID=26245791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0225544A Expired - Lifetime GB2380945B (en) | 1999-01-09 | 2000-01-07 | Multi layered wound dressing |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2380945B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7759537B2 (en) | 2004-02-13 | 2010-07-20 | Convatec Technologies Inc. | Multi layered wound dressing |
| CN109414351A (en) * | 2016-05-09 | 2019-03-01 | 康沃特克科技公司 | Negative pressure wound dressings management system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK3915532T3 (en) * | 2020-05-25 | 2024-06-17 | Moelnlycke Health Care Ab | CONNECTION FOR NATIVE PRESSURE WOUND TREATMENT (NPWT) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0099748A1 (en) * | 1982-07-21 | 1984-02-01 | Smith and Nephew Associated Companies p.l.c. | Adhesive wound dressing |
| EP0304536A2 (en) * | 1987-08-25 | 1989-03-01 | The B.F. Goodrich Company | Polymeric wound dressings |
| EP0538917A1 (en) * | 1991-07-29 | 1993-04-28 | The Kendall Company | Vented wound dressing |
-
2000
- 2000-01-07 GB GB0225544A patent/GB2380945B/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0099748A1 (en) * | 1982-07-21 | 1984-02-01 | Smith and Nephew Associated Companies p.l.c. | Adhesive wound dressing |
| EP0304536A2 (en) * | 1987-08-25 | 1989-03-01 | The B.F. Goodrich Company | Polymeric wound dressings |
| EP0538917A1 (en) * | 1991-07-29 | 1993-04-28 | The Kendall Company | Vented wound dressing |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7759537B2 (en) | 2004-02-13 | 2010-07-20 | Convatec Technologies Inc. | Multi layered wound dressing |
| CN109414351A (en) * | 2016-05-09 | 2019-03-01 | 康沃特克科技公司 | Negative pressure wound dressings management system |
| EP3454807A4 (en) * | 2016-05-09 | 2019-12-18 | ConvaTec Technologies Inc. | Negative pressure wound dressing management system |
| US10779993B2 (en) | 2016-05-09 | 2020-09-22 | Convatec Technologies Inc. | Negative pressure wound dressing management system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2380945B (en) | 2003-06-04 |
| GB0225544D0 (en) | 2002-12-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Expiry date: 20200106 |