WO1998015245A1 - Moisture-regulating adhesive dressing - Google Patents

Moisture-regulating adhesive dressing Download PDF

Info

Publication number
WO1998015245A1
WO1998015245A1 PCT/US1997/017223 US9717223W WO9815245A1 WO 1998015245 A1 WO1998015245 A1 WO 1998015245A1 US 9717223 W US9717223 W US 9717223W WO 9815245 A1 WO9815245 A1 WO 9815245A1
Authority
WO
WIPO (PCT)
Prior art keywords
vapor transmission
moisture vapor
transmission rate
adhesive dressing
adhesive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1997/017223
Other languages
English (en)
French (fr)
Inventor
Steven B. Heinecke
Donald H. Lucast
John T. Capecchi
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Priority to EP97943578A priority Critical patent/EP0934042B1/en
Priority to JP51756198A priority patent/JP4344864B2/ja
Priority to CA002265835A priority patent/CA2265835C/en
Priority to DE69718035T priority patent/DE69718035T2/de
Priority to AU45019/97A priority patent/AU4501997A/en
Publication of WO1998015245A1 publication Critical patent/WO1998015245A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • A61F13/023—Adhesive bandages or dressings wound covering film layers without a fluid retention layer

Definitions

  • the invention relates to regulating the amount of moisture associated with a wound site during the healing process.
  • Wound dressings are designed to adhere to a patient's skin in order to protect an underlying wound during the healing process. To be effective, such dressings must conform and adhere to moist skin without sticking to the wound surface. In addition, such dressings must control the amount of moisture associated with the wound site.
  • the invention features an adhesive dressing that includes an adhesive composition in the form of a substantially continuous layer on at least a portion of a conformable backing in which the adhesive composition and the backing are selected such that said adhesive dressing has an Inverted Buffered Saline Moisture Vapor Transmission Rate of at least about 9000 g/m 2 /24 hrs.
  • the adhesive dressing has an Inverted Buffered Saline Moisture Vapor Transmission Rate of at least about 10,000 g/m 2 /24 hrs, more preferably at least about 12,000 g/m 2 /24 hrs.
  • Particularly preferred are adhesive dressings having an Inverted Buffered Saline Moisture Vapor Transmission Rate of between about 9000 and about 16,000 g/m 2 /24 hrs.
  • the adhesive dressing preferably has an
  • the adhesive dressing has an Inverted Water Moisture Vapor Transmission Rate of no greater than about 3000 g/m 2 /24 hrs.
  • a preferred adhesive composition includes the reaction product of: (a) an acrylic or methacrylic acid ester of a non-tertiary alcohol having between 4 and 14 carbon atoms, inclusive; (b) a hydrophilic, ethylenically unsaturated monomer; and (c) at least 15 parts by weight of an ethylenically unsaturated monomer having one or more carboxylic acid groups.
  • hydrophilic it is meant that the monomer has a high affinity for water.
  • preferred hydrophilic monomers include an acrylate or methacrylate- terminated polyalkylene glycol.
  • An example of a preferred ethylenically unsaturated monomer having one or more carboxylic acid groups is acrylic acid.
  • acrylic or methacrylic acid esters examples include iso-octyl acrylate, 2-ethylhexyl acrylate, n-butyl acrylate, or a combination thereof.
  • a particularly preferred adhesive composition includes the reaction product of iso-octyl acrylate, an acrylate or methacrylate-terminated polyalkylene glycol, and acrylic acid.
  • the backing preferably includes a thermoplastic polyurethane. It preferably has an
  • Inverted Buffered Saline Moisture Vapor Transmission Rate of at least about 9000 g/m 2 /24 hrs. It may include one or more layers of material which may be the same as, or different from, each other. Moreover, the backing preferably has a wet tensile strength of at least about 20 x 10 6 N/m 2 .
  • the invention provides an adhesive dressing useful for treating wounds which effectively regulates the amount of moisture in contact with the wound underlying the dressing.
  • the moisture vapor transmission rate of the dressing changes in response to changes in the pH of the body fluids associated with the underlying wound. It is thus possible to maintain a moist environment sufficient to prevent the underlying wound from dehydrating without creating pools of liquid that can cause adhesive failure.
  • the dressing also exhibits a high moisture vapor transmission rate while retaining its structural integrity in moist environments.
  • the use of a continuous adhesive composition provides improved adhesion to skin relative to dressings featuring patterned adhesive compositions on a backing, and avoids creating channels for fluid leakage.
  • the adhesive dressings feature an adhesive composition provided on a hydrophilic backing in the form of a substantially continuous layer.
  • the dressings are designed to optimize the moisture content of an underlying wound while remaining adhered to skin.
  • the invention was made possible, in part, by the inventors ' discovery of a new method for measuring moisture vapor transmission rate. This method, called the Inverted Buffered Saline Moisture Vapor Transmission Test, measures moisture vapor transmission rate in a slightly alkaline environment
  • the method is similar to the Inverted Water Moisture Vapor Transmission Test often used to measure the moisture vapor transmission properties of films, except that it substitutes buffered saline for deionized water. The method thus provides a good indication of the moisture vapor transmission rate requirements of the wound, thereby providing the basis for designing dressings designed to meet these requirements.
  • the Inverted Water Moisture Vapor Transmission Test provides a good measure of the moisture vapor transmission rate requirements of the wound at neutral pH.
  • the optimum dressings for wound management are those in which the adhesive composition and the backing are selected such that the dressing exhibits an Inverted Buffered Saline Moisture Vapor Transmission Rate of at least about 9,000 g/m 2 /24 hrs. and an Inverted Water Moisture Vapor Transmission Rate of no greater than about 3,000 g/m 2 /24 hrs.
  • the backing is a conformable, hydrophilic, polymeric material which has a high moisture vapor transmission rate (as measured according to both the Inverted Buffered Saline Moisture Vapor Transmission Rate Test and the Inverted Water Moisture Vapor Transmission Rate Test) , yet retains its structural integrity in a moist environment.
  • the backing has an Inverted Buffered Saline Moisture Vapor Transmission Rate of at least about 9,000 g/m 2 /24 hrs, an Inverted Water Moisture Vapor Transmission Rate of at least about 9,000 g/m 2 /24 hrs., and a wet tensile strength of at least about 20 x 10 6 N/m 2 .
  • the backing may include one or more layers of material tailored to achieve the above-described moisture vapor transmission and structural integrity properties.
  • suitable materials include hydrophilic thermoplastic urethanes commercially available from B.F. Goodrich under the trade designation "Estane” including, for example, EstaneTM 58237 and EstaneTM 58245; hydrophilic thermoplastic polyether-amide block copolymers commercially available from ATOCHEM under the trade designation "PEBAX 4011;” and polyether-ester block copolymers .
  • the adhesive composition is provided on a surface of the backing in the form of a substantially continuous layer.
  • it is in the form of a pressure sensitive adhesive.
  • the adhesive composition is selected such that it cooperates with the backing to yield a dressing having the aforementioned moisture vapor transmission characteristics.
  • the adhesive composition is a hydrophilic composition having a sufficiently high concentration of acidic groups such that it has a moisture vapor transmission rate that approximates the pH of the wound site underlying the dressing, and changes in response to changes in the pH of the wound site.
  • a preferred adhesive composition is the reaction product of (a) 50 to 80 parts of an acrylic or methacrylic acid ester of a non-tertiary alcohol having between 4 and 14 carbon atoms, inclusive; (b) 10 to 30 parts by weight of a hydrophilic, ethylenically unsaturated monomer; and (c) at least 15 parts by weight (e.g., 15-25 parts by weight) of an ethylenically unsaturated monomer having one or more carboxylic acid groups.
  • acrylic and methacrylic acid ester monomers include esters prepared by reaction with alcohols such a 1-butanol, 2-butanol, 1- pentanol, 2-pentanol, 3-pentanol, 2-methyl-l-butanol , 1-hexanol, 2-hexanol, 2-methyl-l-pentanol, 3-methyl-l- pentanol, 2-ethyl-l-butanol, 3 , 5 , 5-trimethyl-l- hexanol, 3-heptanol, 1-octanol, 2-octanol, isooctyl alcohol, 2-ethyl-l-hexanol, 1-decanol, 1-dodecanol, 1- tridecanol, 1-tetradecanol , and the like, as well as combinations thereof.
  • Particularly preferred ester monomers include isooctyl acrylate, 2-ethyl hexyl acryl
  • suitable ethylenically unsaturated hydrophilic monomers include free radically reactive hydrophilic oligomers (a polymer having a low number of repeating units, generally 2 to 20) and/or polymers including poly (alkylene oxides).
  • Other suitable ethylenically unsaturated hydrophilic monomers include macromonomers, e.g., aerylate-terminated poly (ethylene oxide), methacrylate-terminated poly (ethylene oxide), methoxy poly (ethylene oxide) methacrylate, butoxy poly (ethylene oxide) methacrylate, p-vinyl benzyl- terminated poly (ethylene oxide), methoxy poly (ethylene oxide) acrylate, butoxy poly (ethylene oxide) acrylate, poly (ethylene oxide) diacrylate, poly (ethylene oxide) dimethacrylate, and combinations thereof.
  • Particularly preferred ethylenically unsaturated hydrophilic monomers include acrylate and methacrylate esters prepared from mono-hydroxyl-terminated poly (lower alkylene oxides) such as polyethylene and polypropylene glycols commercially available under the trade desi .gnati.on "CarbowaxTM” from Uni•on Carbitde Corp. in a variety of molecular weights (e.g., CarbowaxTM 350, CarbowaxTM 550, CarbowaxTM 750, CarbowaxTM 2000, and CarbowaxTM 5000).
  • An example of a preferred acrylate-terminated poly (ethylene glycol) is commercially available from Shin-Nakamura Chemical Co., Ltd., Japan, under the designation "NK Ester AM- 90G.”
  • suitable carboxylic acid- containing monomers include acrylic acid, methacrylic acid, itaconic acid, and combinations thereof.
  • the preferred monomer is acrylic acid.
  • Other useful materials that can be added to the adhesive composition include chain transfer agents for controlling molecular weight (e.g., carbon tetrabromide, mercaptans, or alcohols), tackifiers, plasticizers (e.g., polyethylene glycol, polypropylene glycol, or glycerin), perfumes, deodorants, antioxidants, and pharmacologically active ingredients such as drugs, antibiotics, and anti- icrobial agents.
  • the chain transfer agents are added to the monomer mixture.
  • the other materials can be added to the monomer mixture or to the polymerized composition.
  • the adhesive compositions can be prepared according to a variety of well-known polymerization techniques, including solution, emulsion, and bulk polymerization (e.g., actinic radiation-initiated polymerization as described in Martens et al., U.S. Patent No. 4,181,752. They may be used alone or blended with discrete, crosslinked polymer microspheres as described in the commonly assigned PCT application in the name of Lucast et al. entitled "Pressure Sensitive Adhesive Articles and Methods for Preparing Same," which was filed on August 21, 1997, and claims priority to U.S.S.N. 08/726,513.
  • the microspheres are prepared via a free radical suspension polymerization process. They may be solid or hollow, and either tacky or tack-free.
  • the tack-free microspheres can be elastomeric or plastic.
  • the microspheres typically have diameters ranging from about 1 micrometer to about 300 micrometers.
  • the amount of microspheres preferably is between about 1% and about 75% by volume, and is selected to yield a blend having a substantially smooth, exposed surface available for adhesion after applying the adhesive composition to the backing.
  • the moisture vapor transmission rate was measured according to ASTM E-96-80 using a modified Payne cup method. Specifically, a 35 mm diameter sample of 1 mil (0.025 mm) thick material to be tested containing no perforations was cut. The sample was placed between adhesive-containing surfaces of two foil adhesive rings, each having a one inch (2.54 cm) diameter hole. The holes of each ring were carefully aligned. Finger pressure was used to form a foil/sample/foil assembly that was flat, wrinkle-free, and had no void areas in the exposed sample.
  • a 4 oz. (0.14 kg) glass jar was filled halfway with distilled water.
  • the jar was fitted with a screw-on cap having a 1.50 inch (3.8 cm) diameter hole in the center thereof and with a 1.75 inch (4.45 cm) diameter rubber washer having a 1.12 inch (2.84 cm) diameter hole in its center.
  • the rubber washer was placed on the lip of the jar and the foil/sample assembly was placed on the rubber washer. The lid was then screwed loosely on the jar.
  • the assembly was placed in a chamber at 100°F (38°C) and 20% relative humidity for four hours.
  • the cap was tightened inside the chamber so that the sample was level with the cap (no bulging) and the rubber washer was in proper seating position.
  • the foil/sample assembly was removed from the chamber and weighed immediately to the nearest 0.01 gram (initial weight Vl ) . The assembly was then returned to the chamber for at least 18 hours, after which it was removed and weighed immediately to the nearest 0.01 gram (final weight W 2 ) .
  • the moisture vapor transmission rate (MVTR) in grams of water vapor transmitted per square meter of sample area in 24 hours was calculated according to the following formula (where "T” refers to exposure time in hours) :
  • MVTR (W 2 - W 2 ) (4.74 x 10 4 ) /T Three measurements of each sample were made, and the average value taken. The MVTR values are reported in Table 1 in g/m /24 hrs.
  • the procedure is the same as the Inverted Water Moisture Vapor Transmission Rate Test except that phosphate-buffered saline is substituted for distilled water.
  • the MVTR values are reported in Table 1 in g/m 2 /24 hours.
  • An adhesive composition featuring a pressure sensitive adhesive matrix blended with polymeric microspheres was prepared as follows. To prepare the microspheres, a monomer mixture was prepared by dissolving 4.8 g of acrylic acid, 2.4 g of Carbowax TM 750 acrylate (polyethylene oxide acrylate) and 1.13 g LucidolTM-70 (70% benzoyl peroxide) in 232.8 g of iso-octyl acrylate. A surfactant solution was prepared by dissolving 0.75 g of sodium dodecyl benzene sulfonate in 360 g of water.
  • the monomer mixture was then added to the surfactant solution, and the resulting mixture emulsified using a Gifford-Wood TM mi•xer until the droplet size was less than 5 micrometers.
  • the emulsion was charged to a 1 liter baffled reactor, heated to 65°C, degassed with N 2 , and allowed to react for 8 hours. Microspheres having an average diameter of about 2 micrometers were formed during the reaction period.
  • the adhesive matrix was prepared according to the procedures described generally in PCT US84/00506 and WP 84/03837 using a monomer mixture containing 70 parts by weight isooctyl acrylate, 15 parts by weight acryli •c aci*d, and 15 parts by weight CarbowaxTM 750 acrylate (polyethylene oxide acrylate) .
  • the matrix was then blended with the microspheres (30 microspheres per hundred parts matrix) using a Lightening-brand mixer and applied to a release liner made of silicone-coated kraft paper.
  • a dressing was prepared according to the procedure described in Example 1 of Heinecke et al., U.S. 5,531,855, hereby incorporated by reference to provide a frame delivery system of 6 cm x 7 cm or 10 cm x 12 cm.
  • Example 3 The procedure of Example 1 was followed except that the adhesive composition did not contain any microspheres. The moisture vapor transmission properties of the dressing were measured and are reported in Table 1. Example 3
  • Example 1 The procedure of Example 1 was followed except that the matrix was prepared from a monomer mixture containing 60 parts isooctyl acrylate, 20 parts by wei •ght acryli•c aci*d, and 20 parts by wei•ght CarbowaxTM 750 acrylate (polyethylene oxide acrylate) .
  • the moisture vapor transmission properties of the dressing were measured and are reported in Table 1.

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  • 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)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Laminated Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)
PCT/US1997/017223 1996-10-07 1997-09-25 Moisture-regulating adhesive dressing Ceased WO1998015245A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP97943578A EP0934042B1 (en) 1996-10-07 1997-09-25 Moisture-regulating adhesive dressing
JP51756198A JP4344864B2 (ja) 1996-10-07 1997-09-25 水分を調節する接着性ドレッシング
CA002265835A CA2265835C (en) 1996-10-07 1997-09-25 Moisture-regulating adhesive dressing
DE69718035T DE69718035T2 (de) 1996-10-07 1997-09-25 Feuchtigkeitsregelnder klebeverband
AU45019/97A AU4501997A (en) 1996-10-07 1997-09-25 Moisture-regulating adhesive dressing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/726,510 US5849325A (en) 1996-10-07 1996-10-07 Moisture-regulating adhesive dressing
US08/726,510 1996-10-07

Publications (1)

Publication Number Publication Date
WO1998015245A1 true WO1998015245A1 (en) 1998-04-16

Family

ID=24918910

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/017223 Ceased WO1998015245A1 (en) 1996-10-07 1997-09-25 Moisture-regulating adhesive dressing

Country Status (7)

Country Link
US (1) US5849325A (enExample)
EP (1) EP0934042B1 (enExample)
JP (1) JP4344864B2 (enExample)
AU (1) AU4501997A (enExample)
CA (1) CA2265835C (enExample)
DE (1) DE69718035T2 (enExample)
WO (1) WO1998015245A1 (enExample)

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DE69718035T2 (de) 2003-09-25
DE69718035D1 (de) 2003-01-30
CA2265835C (en) 2006-12-12
EP0934042A1 (en) 1999-08-11
AU4501997A (en) 1998-05-05
EP0934042B1 (en) 2002-12-18
US5849325A (en) 1998-12-15
JP4344864B2 (ja) 2009-10-14
CA2265835A1 (en) 1998-04-16
JP2001525689A (ja) 2001-12-11

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