polyurethane foam dressings examples

I eagerly read the recent article, Evaluation of a polyurethane foam dressing impregnated with 3% povidone-iodine (Betafoam) in a rat wound model [], expecting to find a solid independent research study comparing 6 dressings.I was disappointed. They are available in a range of thicknesses, adhesive and non-adhesive formulations. Apply secondary dressing to secure. The cross-linking agent is preferably difunctional with two or more groups reactive with isocyanate. 4.2.2. Specifically, the fat-soluble adhesive material may be a soft skin adhesive (SSA) commercially available from, for example, Dow Corning, Wacker, BLUESTAR Silicone Co., Ltd., and examples of SSA commercially available from Dow Corning include MG 7-9700, MG 7-9800, MG 7-9850, MG 7-9900 and the like. Specifically, a polyether polyol such as Pluronic L-64 polyoxypropylene glycol or polyethyleneglycol such as NYAX, available from Union Carbide, can be added to the reaction mixture along with a diisocyanate such as toluene diisocyanate with an Index of 109, available from Lankro Chemicals. Within thirty minutes, the film was rising from the evolution of CO2 and within 60 minutes was at a height of 0.250 to 0.400 inches. Although less desireable, the subject invention can be practiced without the use of pre-manufactured prepolymers. Poster presented at Symposium on Advanced Wound Care, May 2-5, 2004; Lake Buena Vista, Fla. Opsite and Tegaderm are polyurethane non-foam film dressings sold by Smith and Nephew and 3M, respectively. Physical and chemical properties of the wound dressings such as foam dressing play an important role in creating environment conductive to the wound healing (Zahedi et al. A catalyst should also be present in the mixture to drive the reaction. The CO2 evolved causes the elastomeric polyurethane to swell and ultimately collapse during curing, as described below, with the formation of voids or cells. Design Open-label, parallel-group, 2-arm, superiority trial. In general, foam dressings use a cover dressing and tape to secure it in place. These dressings come in various shapes and sizes. Wet-to-dry. In an attempt to solve this problem, U.S. Pat. The cotton fibers tend to adhere to the wound surface, thus causing further damage to the wounded area when the dressing is removed or changed. The reaction inhibitor is preferably used in an amount ranging from 0.07 to 2 parts by weight based on 100 parts by weight of the hydrophilic adhesive. sanitary towels, tampons, Use of materials characterised by their function or physical properties, FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. The hydrophobic properties of outer layer protect from the liquid but allow gaseous exchange and water vapor. Comparison of adhesive strength between adhesive wound dressings. Applying the hydrophilic adhesive composition can be performed using a thin film applicator. Foam • Made up of polyurethane foam • Used as secondary dressing or cavity fillers • Absorbs moderate to large amounts of fluid • Available in various sizes and shapes • Cushioning effect • Conforms to body contour 13. Hereinafter, the present invention will be described in further detail with reference to examples, but the scope of the present invention is not limited to these examples. The present invention relates to a polyurethane foam dressing having excellent adhesive properties and a manufacturing method thereof, in which the polyurethane foam dressing has high capacities for absorption and retention of exudates so that it can be applied even to high-exudate wounds, and in which a hydrophilic adhesive is applied to the wound contact layer of the polyurethane foam . Dry wounds. Demirtas Y, Yagmur C, Soylemez F, Ozturk N, Demir A. Manage- donor sites showed a high rate of complications and patient ment of Split-thickness skin graft donor site: a prospective clinical dissatisfaction, although results were more favorable when trial for comparison of diferente . In 1962, it was reported that the epithelialization of wounds maintained in a moist state is faster than that in a dry environment. The percent absorbance was calculated by comparing the dry weight with the wet weight. Silicone-based rubber foam (silastic) molds and contours to wound shape. Ideal for use under compression bandaging with its fluid retention, low profile and low friction film backing. Adhesive. As the thickness of the adhesive layer increased, the adhesive strength slightly increased. The binder may be used in an amount of 0.07-5 parts by weight, and preferably 0.7-3 parts by weight, based on 100 parts by weight of the hydrophilic adhesive. Kaltostat not suitable for use in infants less than 12 months Dry wounds or hard eschar Sensitivity Foam-Polyurethane foam dressing, some with adhesive layer incorporated PolyMem Allevyn Hydrasorb Mepilex Mepilex border Allevyn cavity Wounds with mild to moderate exudate. Foam dressings are now available with antimicrobial properties. The polyurethane foam preferably has a thickness of 1.0-10 mm. In accordance with the present invention, a wound dressing material is produced with improved properties. Polyurethane film coated with adhesive . Foam Dressings are made of highly absorbent material and are often made of polyurethane foam. Particularly useful is a silicone polyethylene oxide copolymer with terminal hydroxyl groups, such as Surfactant 193 from Dow Corning. Under these conditions, the curing of the composition is efficiently achieved. A wound dressing material and a method for making the material is disclosed. New PHMB-impregnated hydrophilic polyurethane foam dressings are available (for example, AMD Antimicrobial Foam Dressing; Kendall). 3,718,532 discloses a porous plastic made from an emulsion blended plastic substrate. Polyurethane foam dressings have been developed for many years and have been utilized to treat the wounds with mild to moderate exudate. The test for the water absorption rate and water retention rate of the adhesive wound dressings of Examples 1 to 16 and Comparative Examples 1 to 4 was carried out for two sample groups: a sample group irradiated with 25 KGY of gamma rays; and a sample group not irradiated with gamma rays. To the whipped mixture was added a mixture of 54 ml of Pluronic L-64 (BASF) and 12 cc of dimethyaminoethanol available from Eastman Kodak Co. as a drizzle over two minutes while stirring vigorously. Among the manufactured adhesive wound dressings, in the case when the content of polyacrylic acid (water-soluble adhesive material) was 5 parts by weight (Example 24), the adhesive layer was easily separated from the foam layer in comparison with the cases when the content of polyacrylic acid was 10 parts by weight and 20 parts by weight (Examples 25 and 26). This is laminated to a pink, low friction, waterproof polyurethane film, which provides a bacterial barrier to the wound. Found inside – Page 226When the primary layer is removed, the foreign matter and necrotic debris that have dried to the gauze are pulled off ... polyethylene glycol sponges, and polyurethane foam sponges are examples of nonadherent, semiocclusive dressings. Hypol 2003, on the other hand, is characterized at 1500 grams per mol, having a 2.0 meq/gram reactivity. Co. Ltd, SUPERSCAN SS-550), after which the sample of each of Examples 1 to 16 and Comparative Examples 1 to 4 was examined. 4,233,969 to Lock, et al., dated Nov. 18, 1980, the disclosure of which is incorporated herein by reference. Remove necrotic tissue and loose debris by mechanical adhesion. Silicone-based rubber foam (silastic) molds and contours to wound shape. Also, it could be seen that all the products were easily removed from the portion (skin) to which they have been applied. Alginates A polyurethane foam wound dressing and a method for making the dressing is described. The foam was instantly formed by interaction of polyols and diisocyanate. Dressing examples: Dressing Manufacturer Allevyn Smith & Nephew Biatain Coloplast Lyofoam Monlycke ActivHeal Foam Sutherland Medical Dry, fragile surrounding skin Note the raised granulation tissue. Thus, many efforts have been made to heal wounds such as traumas, and various healing methods have been developed and are still being developed. sanitary towels, tampons containing macromolecular materials, Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof, ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON, Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers, MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS, Zaidan Hojin, Seisan Kaihatsu Kagaku Kenkyusho, Minnesota Mining And Manufacturing Company, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, HYUN JUNG;KIM, KAB KEUN;LEE, SEUNG MOON;AND OTHERS;REEL/FRAME:026661/0677, ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION, The Significance of Surface pH in Chronic Wounds, Polyuretane form dressing material having good adhesive property and a method of preparing thereof, Polyurethane Foam Dressing Material with Excellent Adhesive Property and Method for Preparing the Same, Polyurethane foam dressing having excellent adhesive properties and manufacturing method thereof, Polyurethane foam dressings with excellent adhesive properties and method of making them, Polyurethane foam dressing that has excellent adhesive properties and its manufacturing method, Medical drape having an ultra-thin drape film and a thick adhesive coating, Thermal bonding method dust-free expanded paper and preparation method and application thereof, Method for manufacturing medical articles composed of silicone rubber coated with collagen, Hydrophilic polyurethane gel foams, particularly for treating deep wounds, wound dressing based on hydrophilic polyurethane gel foams and method of manufacture, Preparation of hydrophilic pressure sensitive adhesives having optimized adhesive properties, Pressure-sensitive adhesive containing near infrared absorbing coloring matter, Spyrosorbent wound dressings for exudate management, Thin film adhesive dressings preparation and use, Antimicrbacterial dressing material and method for preparing thereof, Compositions for use as or in wound dressings, Hydrogels for Wound Dressings Containing Covering Layer to Prevent Water Loss and Its Preparation, Water absorbent polymer for medical treatment and coating material for wound formed by using the same and external material for medical treatment and their production, Information on status: application discontinuation. These have three constituents: a low-adherent polyurethane net that comes into contact with the wound and is designed to prevent or reduce adhesion, a central layer of hydrophilic polyurethane foam, and a polyurethane film backing that blocks the passage of exudate (Dale, 1997). The properties of the membrane thus produced are given in Table 1. Non-adherent dressings examples/types Also, there was no difference in adhesive strength between the contents of the water-soluble adhesive materials. This property is thought to contribute to the greatly improved moisture vapor transmission rate that allows water or liquid exudate to be absorbed, but at the same time does not dehydrate the wounded area. The fat-soluble adhesive material serves to provide stable adhesion of the foam dressing to the skin. To determine the water retention rate of the adhesive polyurethane dressings, each of the adhesive wound dressings was cut to a size of 3 cm×3 cm and dried in a vacuum oven at 50° C. for 24 hours, after which and the initial weight of the cut sample was measured (A). Foam Dressings Polyurethane foam dressing with adhesive layer incorporated. This process produces a stiff and boardy bandage that is not easily pliable. For surface analysis, each of the adhesive wound dressings was coated with platinum ions and then placed on a scanning electron microscope (SHIMADZU. In order to examine the adhesive strength of the adhesive dressings of Examples 1 to 16 and Comparative Examples 1 to 4, each of the prepared samples was placed on an Instron universal tester, and the adhesive strength thereof was tested in accordance with ASTM D3330. The result is a nanosilver-modified hydrophilic flexible polyurethane foam ideal for antimicrobial dressings, with a quick kill and long-term efficacy. They can be used on top of hydrogels and creams or as primary dressings and are useful in reducing over granulation when applied with slight pressure. resorbable wound dressings (16). The product exhibited surprisingly exceptional characteristics, including superior conformance, WVTR and absorbance. polyurethane foam dressings was captured. As described above, according to the present invention, the adhesive polyurethane foam dressing for wound healing can be easily manufactured. Reactants found most useful with the present invention include polyurethane prepolymers which are mid-range molecular weight polymers with residual isocyanate groups available for reaction. Foam dressings. Their absorptiveness varies depending on the thickness of the dressing. Skin substitutes. The prepared hydrophilic adhesive composition was applied to a release film in such a manner that the post-cure thickness thereof was 10, 20, 40, 50, 60, 80, 95 and 110 μm (Examples 1 to 8, respectively). These and other advantages of the subject invention will become apparent to those skilled in the art upon a reading of the Description of the Preferred Embodiment together with the drawings. Wounds that need frequent review: Hydrocolloid Dressings. For example, dimethylethanolamine (DMEA), available from Lankro Chemicals and sold under the trade name Propamine A, is particularly useful with the present invention. ALLEVYN LIFE has a wide silicone border which can be lifted and repositioned which may help facilitate regular skin inspections, the dressing stays in place without the need for secondary retention 7.The multi-layer dressing construction redistributes pressure across and through the . Foam Dressings Polyurethane foam dressing with adhesive layer incorporated: PolyMem: Moist, highly absorbent and protective: Set size of foam may be limited by wound size: Wounds with mild to moderate exudate. Also, in the case when the content of polyacrylic acid was 30 parts by weight (Example 27), the compatibility of the polyacrylic acid with the silicone (fat-soluble adhesive material) was somewhat reduced. The properties of the prepared adhesive wound dressings (Examples 1 to 8) were measured according to the methods described in the following test example, and the results of the measurement are shown in Table 1 below. Found inside – Page 130Hydrocellular foams are also available as cavity dressings consisting of polyurethane foam chips encapsulated in a honeycombed polyurethane film, and available in circular and tubular shapes with two sizes of each shape (e.g. Allevyn ... 23, No. Adherent dressing function. Nos. In addition, the adhesive polyurethane foam dressing according to the present invention shows no decrease in adhesive strength even after gamma ray irradiation and can be removed without causing pain. These bandages have a tendency to damage the wound surface by causing excessive dehydration of the wound. Adhesive wound dressings (Examples 28 to 35, respectively) were manufactured in the same manner as Example 1, except that urethane foams having various thicknesses of 0.5, 1.0, 2.0, 3.0, 4.0, 5.0, 10 and 20 mm and a density of 0.2 g/cm. Typically used for partial and full thickness wounds, foams . U.S. Pat. Foam pad thickness is usually in the range of 1.-lO.Omm to optimize for capacity and facile attachment to the wound and surrounding skin. Found inside – Page 877.2.5 Foam Dressings Foam dressings are normally made up of porous polyurethane foam or foam films, and are available with ... Some classic examples are Alldress® (Mölnlycke), CoversiteTM (Smith and Nephew) and CoverDerm® (DeRoyal). It may be a silicone compound and is preferably at least one selected from the group consisting of a polydimethylsiloxane with vinyl groups, and a hydrogen-terminated dimethylsiloxane. October 9, 2012 February 25, 2020 Wound Care Advisor. enclosed in a membrane of perforated polymeric film, giving a loosely filled bag. Found inside – Page 102... a central absorbent layer of sodium carboxymethylcellulose fibres and an outer layer of polyurethane foam. ... Examples of hydrocolloid dressings include Comfeel PlusTM, Cutinova HydroTM, GranuflexTM (known as DuodermTM outside the ... To 50 parts by weight of 2-component silicone A (Dow Corning MG 7-9700) and 50 parts by weight of 2-component silicone B (Dow Corning MG 7-9700), polyacrylic acid (GME 2397; Medical grade; manufactured by Cytec Industries Corp.), a water-soluble adhesive material, was added in varying amounts of 5, 10, 20 and 30 parts by weight. Found inside – Page 412Polyurethane foam with a hydrophilic property inside the dressing and hydrophobic outside *Examples: • Allyven • Curafoam • Epilock • Hydrasorb • Retains moisture • 1 autolytic debridement • J pressure • Non-adherent Indicated for: ... As noted by Winters, these bandages leave impressed creases in the new tissue formed which can take up to two weeks to disappear. 5,445,604 and 5,065,752 disclose hydrophilic polyurethane foam dressings having a three layer structure, in which a film is laminated on both sides of a polyurethane foam and in which the film coming into contact with the wound bed (wound contact layer) is mechanically perforated so as to prevent macropores of the wound contact layer from being stuck to the wound bed and to absorb exudates. The polyurethane is highly absorptive and acts as a wick for wound fluids, making them useful for highly exudative wounds (Figure 1). The resultant membrane has a moisture vapor transmission rate greater than 0.30 grams/inch2 /day. Particularly useful are tertiary amines or other nucleophiles which cannot react through the amine function but can react through a hydroxyl group. The procedure was carried out as in Example I with the exception that 1.5 cc of FC 430 (3M) a fluorinated hydrophobic material, was added as a cast film coater to synthetically reproduce the anhydrous conditions of Example II. Found inside – Page 250Contains an acrylic adhesive that aids in easy removal of the bandage. [53–55] Lyofoam Seton Healthcare Group, PLC A semipermeable polyurethane foam sheet [56, 57] Films OpSite Smith & Nephew, Inc. A thin, semipermeable polyurethane ... Moist wound The test was carried out for six days with the experimental apparatus being weight on days 1, 2, 3, and 6. Polyurethane Foam Dressing Having Excellent Adhesive Properties and Manufacturing Method Thereof. Particularly, the foam layer has a retention capacity of about 300-1,200%, a pore area (membrane opening) of about 10-35% of the total area of the cells, an average open-cell diameter of about 50-300 μm, an average pore diameter of about 5-85 μm, an open cell ratio of about 20-70%, a density of about 0.15-0.45 g/cm. Foam dressings are bandages that cushion the wound and are often made from polyurethane material with open cells that retain fluid. Polyhexamethylene biguanide (PHMB) is as an antimicrobial agent exhibiting broad spectrum activity against bacteria and fungi. The glass bottle had an opening with a three inch inner diameter. Found inside – Page 221Bandages promote healing, protect wounds from the environment and the patient, absorb exudate, eliminate dead space, ... For example, highly absorptive dressings such as hypertonic saline, calcium alginate, and dry polyurethane foam ... Found inside – Page 34List examples of nonadherent, semiocclusive dressings. • Commercial preparations (Telfa, Release) • Petrolatum-impregnated (with or without antibiotics) autoclaved gauze sponges • Polyurethane foam (Hydrabsorb) 5. The catalyst can be organic or inorganic, so long as it does not interfere with the cross-linking agent present. The water vapor which was transmitted was that daily loss of weight, noting that the weight measurements were taken at approximately the same time each day. Foam dressings are made of polyurethane or silicone, enabling them to handle large volumes of wound fluid. The procedure from Example 1 was repeated with the exception that the reaction mixture was cured in the near absence of water at approximately 130° F. and an RH of 20%. Generally made from semipermeable polyurethane, the foam dressings are non-adherent and non-linting, creating a moist environment conducive to healing. The adhesive layer formed by applying the hydrophilic adhesive composition to the polyurethane foam preferably has a post-cure thickness of 20-95 μm. The patch should be covered with a transparent polyurethane dressing to suppress cutaneous colonization. However, the hydrocolloid-type dressings are not suitable for healing wounds that produce large quantities of exudates because of their inferior moisture permeability and exudate-absorbing capacity. Polyurethane foam dressings. Found inside – Page 236Examples of pure calcium alginate include Sorbsan® and Algisite M®. Kaltostat® is a mixture of sodium and calcium salts (licensed haemostat). Polyurethane foam dressings These contain hydrophilic, absorbent polyurethane foam which is ... The water-soluble adhesive material serves to provide compatibility between the adhesive layer and the polyurethane foam layer and is preferably at least one polymer resin selected from the group consisting of methylacrylate, ethylacrylate, octylacrylate, ethylhexylacrylate, butylmethacrylate, acrylic acid, and methacrylic acid. The area in contact with the wound surface is non-adhesive for easy removal. Then, the sample was immersed in distilled water at 25° C. for 24 hours, after which a 3-kg roller was rolled three times on the sample, and then the weight of the sample was measured (C). Foam dressings are highly absorptive, which makes them a good choice for wounds that produce moderate to heavy exudate. 2.6.4 Polyurethane foam dressings with high moisture vapour transmission rates may be In general, foam dressings use a cover dressing and tape to secure it in place. ALLEVYN LIFE dressings stay in place for up to 7 days, which may reduce the frequency of dressing changes* 6. The mixture was placed immediately to cure and held at 68° F./ at 68% relative humidity. Privacy Policy The binder is preferably a polyvinyl pyrrolidone compound, and more preferably one or more selected from the group consisting of PVP 12CF, PVP CL, PVP CL-F, PVP 25, PVP 30, PVP 90-F and PVP VA64, but is not limited thereto. Then, the water absorption rate of the sample was calculated using the following equation 1. No tension was placed on the samples. Further, these dressings lack insulation properties necessary to enhance the healing process. The accumulation of excess liquid can also cause delamination of the adhesive bandage causing the bandage to become loose and fall off. U.S. Pat. Wet environment is important for the fastest wound healing. Such a reaction is described in U.S. Pat. dressing. Cover with a non-adherent high absorbent dressing. The contact area of a foam dressing is nonadherent and nonlinting, so the dressing is easy to . Found inside – Page 136Silicone dressings Silicone dressings can be considered as a wound contact layer to promote atraumatic dressing changes or as the contact layer within a dressing, for example, Mepilex, a polyurethane foam membrane is coated with a soft ... Figure 3: Foam dressing. Openings within the dressing are controlled by removal of the solvent during processing. not heal a wound and that the priority should always be to optimise the patient's potential for healing through for example, correcting . As used herein, the term “application under atmospheric pressure conditions” means that a roller, for example, is not used to apply pressure to the hydrophilic adhesive composition during or immediately after application of the composition. In order to measure the initial absorption speed of Examples 1 to 16 and Comparative Examples 1 to 4, PBS was dropped from a height of 1 cm onto the wound contact surface of the dressings, and the time taken for the PBS to be absorbed into the dressing was measured. Specifically, each of samples prepared to have a size of 1.2 cm×15 cm was placed and fixed between grips, after which the adhesive strength of each sample was measured at a cross-head speed of 300 mm/min, and the maximum stress was determined. The adhesive composition may further comprise a reaction inhibitor (curing retarder). The adhesive polyurethane foam dressing manufactured according to the present invention has excellent capacities for absorption and retention of wound exudates and are easily applied to wounds due to their adhesive properties. Systemic antibiotics should be used only if clinical signs of infection are seen. Alvarez et al., Healing Wounds: Acclusion or Exposure, Infections in Surgery, (Mar., 1984). Polymerization occurs in the presence of substantial amounts of water to enhance CO2 formation. Nos. A Few Tips Wounds are dynamic and the treatment should change as the wound heals or fails to heal. & Terms of Use. To achieve the above object, the present invention provides a polyurethane foam dressing comprising a laminate of a sponge-like wound contact layer and a film-like protective layer, in which an adhesive layer is formed on the wound contact surface of the wound contact layer, wherein the adhesive layer consists of a hydrophilic adhesive composition comprising 100 parts by weight of a hydrophilic adhesive and 0.07-5 parts by weight of a binder. For example, North America is anticipated to contribute a large share of the global foam dressings market over the forecast period (2016-2024). Allevyn Cavity, Allevyn Plus Cavity, Cavity wound with Polyurethane foam dressings are also available as a cavity Cavi-Care medium to high exudate dressing—small chips of hydrophilic polyurethane foam *Not available on prescription in UK primary care. The dressing is made from the reaction of a polyurethane prepolymer with a difunctional cross-linking agent in the presence of DMEA and substantial amounts of water. In order to demonstrate the invention, the following experiments were carried out with a variety of reactants. Foam dressings . woven or nonwoven absorbent pad, island dressings comprising superabsorbent material, Adhesive plasters or dressings characterised by the skin adhering layer, Adhesive plasters or dressings characterised by the skin adhering layer characterized by the adhesive material, Adhesive plasters or dressings characterised by the skin adhering layer characterized by the parametric properties of the adhesive, Apparatus or processes for manufacturing adhesive dressings or bandages, Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. This in turn results in the unique and surprising properties demonstrated by the film. Advanced wound repair therapies provides readers with up-to-date information on current and emerging biomaterials and advanced therapies concerned with healing surgical and chronic wounds. hydrophilic polyurethane or film coated layer; with or without adhesive even gel based adhesive; available with silver (refer to antimicrobial section) Partial & full thickness wounds with moderate to heavy exudate; used as a primary or secondary dressing; do not use on dry wounds -Sheet form: change 3 X per week -foam filler: change q day These bandages alleviate some of the prior art problems and encourage advanced healing rates, however, they exhibit adhesive properties which may interfere with healing and may retard the re-epithelialization upon removal and redressing. They are available in varying forms and may be adhesive or non-adhesive, and thick or thin. Lyofoam, Cutinova plus, PolyMem: Moist, highly absorbent and protective: Set size of foam may be limited by wound size: Wounds with mild to moderate exudate. Found inside – Page 116Examples are Xeroflo (The Kendall Co), Mepitel (Mölnlycke Health Care, Gothenburg, Sweden), Adaptic (Johnson & Johnson Medical ... Foam dressings and alginates are classified as both absorptive and occlusive/moistureretentive dressings. No. The main hypothesis of this study is that hydrocolloid dressings would heal at least 10% more stage II PrUs than polyurethane foam dressings over 8 weeks of follow-up in patients with PrU-II. The bandage permits air to perfuse therethrough, has a non-adherent, mirror smooth surface for application to the wounded area and is highly flexible for contouring purposes. If the wound is highly exudating then an outer absorbent pad may be added. The opening was covered with the material to be tested and the material wired in place.

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