WO2017138653A1 - 創傷被覆用シート - Google Patents
創傷被覆用シート Download PDFInfo
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- WO2017138653A1 WO2017138653A1 PCT/JP2017/004995 JP2017004995W WO2017138653A1 WO 2017138653 A1 WO2017138653 A1 WO 2017138653A1 JP 2017004995 W JP2017004995 W JP 2017004995W WO 2017138653 A1 WO2017138653 A1 WO 2017138653A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wound
- sheet
- degree
- strength
- substitution
- Prior art date
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- 238000006467 substitution reaction Methods 0.000 claims abstract description 26
- 229920003043 Cellulose fiber Polymers 0.000 claims abstract description 13
- 239000004627 regenerated cellulose Substances 0.000 claims abstract description 12
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims abstract description 9
- 229920002678 cellulose Polymers 0.000 claims abstract description 6
- 239000001913 cellulose Substances 0.000 claims abstract description 6
- 125000002791 glucosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)[C@H](O1)CO)* 0.000 claims abstract description 4
- 125000002887 hydroxy group Chemical class [H]O* 0.000 claims abstract description 4
- 239000004745 nonwoven fabric Substances 0.000 claims description 19
- 229920000742 Cotton Polymers 0.000 claims description 5
- 239000002759 woven fabric Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 abstract description 25
- 238000010521 absorption reaction Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 40
- 206010052428 Wound Diseases 0.000 description 33
- 208000027418 Wounds and injury Diseases 0.000 description 33
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 27
- 239000000835 fiber Substances 0.000 description 27
- 230000005588 protonation Effects 0.000 description 24
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 18
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 16
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 16
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000002253 acid Substances 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 210000000416 exudates and transudate Anatomy 0.000 description 7
- 230000029663 wound healing Effects 0.000 description 7
- 229920000297 Rayon Polymers 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 125000003158 alcohol group Chemical group 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 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 4
- 150000008064 anhydrides Chemical class 0.000 description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 description 4
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 4
- 239000002964 rayon Substances 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 238000009987 spinning Methods 0.000 description 4
- 239000011550 stock solution Substances 0.000 description 4
- 206010061218 Inflammation Diseases 0.000 description 3
- 239000008186 active pharmaceutical agent Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- QKSIFUGZHOUETI-UHFFFAOYSA-N copper;azane Chemical compound N.N.N.N.[Cu+2] QKSIFUGZHOUETI-UHFFFAOYSA-N 0.000 description 3
- 238000011534 incubation Methods 0.000 description 3
- 230000004054 inflammatory process Effects 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- FDRCDNZGSXJAFP-UHFFFAOYSA-M sodium chloroacetate Chemical compound [Na+].[O-]C(=O)CCl FDRCDNZGSXJAFP-UHFFFAOYSA-M 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- -1 pulp Polymers 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229920000433 Lyocell Polymers 0.000 description 1
- 229920001407 Modal (textile) Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 208000004210 Pressure Ulcer Diseases 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000021164 cell adhesion Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- ZURAKLKIKYCUJU-UHFFFAOYSA-N copper;azane Chemical compound N.[Cu+2] ZURAKLKIKYCUJU-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 230000002439 hemostatic effect Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 238000005211 surface analysis Methods 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005406 washing Methods 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
- A61F13/01—Non-adhesive bandages or dressings
- A61F13/01008—Non-adhesive bandages or dressings characterised by the material
- A61F13/01012—Non-adhesive bandages or dressings characterised by the material being made of natural material, e.g. cellulose-, protein-, collagen-based
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
- A61L15/28—Polysaccharides or their derivatives
-
- 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
- A61F13/01—Non-adhesive bandages or dressings
- A61F13/01034—Non-adhesive bandages or dressings characterised by a property
- A61F13/01042—Absorbency
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L5/00—Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00
- C08L5/14—Hemicellulose; Derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B11/00—Preparation of cellulose ethers
- C08B11/02—Alkyl or cycloalkyl ethers
- C08B11/04—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals
- C08B11/10—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals substituted with acid radicals
- C08B11/12—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals substituted with acid radicals substituted with carboxylic radicals, e.g. carboxymethylcellulose [CMC]
Definitions
- the present invention relates to a wound dressing sheet containing natural or regenerated cellulose fibers containing partially protonated carboxymethyl cellulose (hereinafter abbreviated as CMC). More specifically, the present invention relates to a natural or regenerated cellulose fiber-containing wound dressing sheet containing CMC which can maintain high form stability after liquid absorption while maintaining high liquid absorption.
- CMC carboxymethyl cellulose
- Patent Document 1 describes soluble wound healing hemostatic cellulose fibers having a degree of substitution of CMC of less than 0.5 to 1.0, and also describes that CMC has a cell adhesion promoting action. Yes.
- Patent Document 2 below also describes that when CMC is applied to a wound, insoluble foreign matter that may cause inflammation of the wound does not remain.
- CMC-Na sodium carboxymethyl cellulose in which sodium is bonded to a carboxymethyl group
- CMC-Na sodium carboxymethyl cellulose in which sodium is bonded to a carboxymethyl group
- CMC-H carboxymethyl cellulose
- the problem to be solved by the present invention is to provide a novel wound covering sheet having high liquid absorbency and strength.
- the present inventors can prepare a CMC with a controlled degree of protonation by immersing a structure containing carboxymethylated natural or regenerated cellulose fibers in an acid such as acetic acid or hydrochloric acid adjusted to a predetermined concentration. Further, the inventors found that the strength can be increased while maintaining liquid absorbency by controlling the substitution degree and protonation degree of CMC within a predetermined range, and the present invention has been completed based on such findings. Is.
- the present invention is as follows.
- wound healing can be promoted by retaining more exudate in CMC, and the form can be retained during treatment. There is little remaining in the wound and there is no inflammation of the wound.
- the wound covering sheet refers to a sheet-like structure that protects wounds, prevents infection from the outside, accelerates healing of wounds, and relieves pain.
- wound dressings used for wet therapy such as bandages, pressure ulcers, and burns.
- the natural or regenerated cellulose fiber in the present embodiment is not particularly limited, and known cellulose fibers such as copper ammonia rayon, viscose rayon, cotton, pulp, polynosic are used, preferably copper ammonia rayon and viscose rayon. More preferred is copper ammonia rayon. These fibers may be either continuous long fibers or short fibers. As long fibers, continuous long fibers are preferred. In the present specification, the long fiber means a fiber having a fiber length of 10 mm or more, and the fiber length is preferably 20 mm or more, more preferably 50 mm or more, and still more preferably a continuous long fiber.
- the structure of the present embodiment is preferably in the form of cotton, woven fabric or non-woven fabric.
- a more preferred form is a woven or non-woven fabric of regenerated cellulose fibers
- a more preferred form is a non-woven form of regenerated cellulose fibers
- a still more preferred form is a non-woven fabric of cupra. If it is in a non-woven form, the fibers are entangled even in a gelled state when wet, so that moderate flexibility can be obtained while maintaining the strength when wet, and when applied to the skin, Easy to follow movement. Moreover, it is easy to affix the wound dressing along the recess. Furthermore, since the surface area is large, the exudate discharged from the wound can be absorbed quickly.
- the fiber constituting such a nonwoven fabric is cupra, the degree of crystallinity is low, so the reactivity at the time of carboxymethylation is high, and the shape stability is also excellent. Further, in the case of a nonwoven fabric, a non-binder nonwoven fabric is preferred because the nonwoven fabric provided with a binder has a slow solution permeation rate and there is a concern about elution of the binder component.
- the sheet-like structure of the present embodiment includes fibers other than natural or regenerated cellulose fibers, for example, synthetic fibers such as polyester fibers, polypropylene fibers, and nylon fibers, as long as desired effects are not impaired. Also good. Such synthetic fibers may be long fibers or short fibers.
- the density (g / cm 3 ) of the sheet-like structure of this embodiment for example, (nonwoven fabric weight (g) / nonwoven fabric volume (cm 3 )) is 0.03 g / cm 3 or more and 1.0 g / cm 3 or less. Preferably, it is 0.03 g / cm 3 or more and 0.5 g / cm 3 or less, more preferably 0.03 g / cm 3 or more and 0.4 g / cm 3 or less. If the density is too low, it may be difficult to obtain sufficient strength even if it is partially protonated. On the other hand, if the density is too high, it will be difficult to change the form and the placement on the affected area will be complicated. .
- the thickness of the sheet-like structure of the present embodiment is preferably 0.03 mm or more and 5.0 mm or less, more preferably 0.03 mm or more and 3.0 mm or less, when it is woven or non-woven. Preferably they are 0.03 mm or more and 1.0 mm or less, Most preferably, they are 0.03 mm or more and 0.8 mm or less. If the thickness is too thin, it may not be possible to obtain sufficient strength even if it is partially protonated. On the other hand, if the thickness is too thick, the flexibility is lost and the arrangement on the affected area becomes complicated.
- the “thickness” of a nonwoven fabric refers to a value obtained by measuring a load of 1.96 kPa in a thickness test in accordance with JIS-L1096.
- the average substitution degree (DS) of hydroxyl groups in glucose units constituting the cellulose when carboxymethylated is required to be 0.3 or more and 1.0 or less, preferably Is 0.3 or more and less than 0.8, more preferably 0.3 or more and less than 0.6. If DS is 0.3 or more, a sufficient amount of liquid absorption can be secured when partially protonated. On the other hand, if the degree of substitution exceeds 1.0, sufficient strength can be obtained even when protonated. I can't.
- the sheet-like structure of the present embodiment has a sodium salt at the end of the carboxymethyl group at the time of carboxymethylation, but then treated with an acid to convert some of the carboxymethyl groups to a proton type. Can be obtained.
- the degree of protonation of carboxymethyl group needs to be 5% or more and 80% or less, preferably 5% or more and 60% or less, in order to obtain sufficient strength while maintaining high liquid absorbency. More preferably, it may be 10% or more and 60% or less.
- the continuous long fiber cupra nonwoven fabric can be produced by the following method.
- a stock solution in which cotton linters having a degree of polymerization removed and dissolved in a copper ammonium solution is removed from a spinneret (spinner) having pores (stock solution discharge holes), dropped in the funnel together with water, and removed. While the stock solution is solidified by ammonia, it is stretched and sprinkled onto a net to form a web. At this time, the fiber shaken down to the net draws a sine curve by vibrating the net in a direction perpendicular to the traveling direction. Stretching at the time of spinning can be 100 to 500 times, and the stretching ratio can be arbitrarily adjusted by changing the shape of the spinning funnel and the amount of spinning water flowing down.
- the single fineness and the strength of the nonwoven fabric can be changed. It is also possible to control low-molecular weight cellulose, so-called hemicellulose, remaining in a small amount in the stock solution by changing the amount of spinning water and temperature. Further, by controlling the traveling speed and vibration width of the net, it is possible to control the fiber arrangement direction and control the strength, elongation and the like of the nonwoven fabric.
- the carboxymethylated sheet-like structure can be produced by the following method. First, a natural or regenerated cellulose fiber structure is stirred at 35 ° C. for 30 minutes while maintaining an alkaline state in an alcohol-containing sodium hydroxide aqueous solution. Thereafter, the reagent in the reaction vessel is drained, sodium monochloroacetate containing alcohol is added, and the mixture is stirred at 30 to 50 ° C. for 1 to 12 hours. In this case, the degree of substitution is controlled by the bath ratio of the reaction solution and the structure, the temperature, and the time. Further, other reaction conditions can be appropriately changed in consideration of production costs and the like.
- the obtained structure is adjusted to pH 6.0 to 8.0 with an acetic acid-containing ethanol aqueous solution, and then alcohol substitution is performed with 70 wt%, 90 wt%, and 100 wt% ethanol. Since even a little moisture is contained, it becomes hard, and by gradually increasing the alcohol concentration, alcohol substitution can be reliably performed and form stability can be maintained. Thereafter, it is immersed in an acid-containing ethanol solution adjusted to a predetermined concentration, stirred for 1 hour, substituted with alcohol with 70 wt%, 90 wt%, and 100 wt% ethanol and dried to obtain a protonated sheet-like structure.
- the dipping step in the acid may be performed simultaneously with the neutralization step. That is, normally, two steps are required to carry out the acid soaking step after the neutralization step, but the neutralization step and the acid soaking step may be performed simultaneously and performed in one step.
- the method for partially protonating the sheet-like structure of the present embodiment is not particularly limited, but is protonated by immersing it in acetic acid, hydrochloric acid or nitric acid adjusted to a predetermined concentration using alcohol. Is more preferable, and acetic acid adjusted to a predetermined concentration is more preferable.
- acetic acid adjusted to a predetermined concentration is more preferable.
- a SUS reactor can be used for protonation with acetic acid.
- the sheet-like structure of the present embodiment may be partially protonated, dried and used as it is, but is preferably heat-treated at a temperature of 50 ° C. or more for 1 hour or more, more preferably 80 to 120.
- the heat treatment is performed at a temperature of 3 ° C. for 3 hours or more, and more preferably at a temperature of 100 to 120 ° C. for 3 hours or more.
- the heat treatment method include hot air treatment, dry heat treatment, wet heat treatment, and vacuum heat treatment. Hot air treatment is preferable for efficient treatment, but is not particularly limited thereto.
- the sheet-like structure of the present embodiment is characterized in that it gels even when it has a high strength when wet. Not only has a high liquid absorbency by gelling when wet, but also increases the adhesion to the skin, making it easier to follow the movement of the skin. In addition, gelation softens the texture and reduces the effect on the skin.
- Alkalinity ⁇ (B ⁇ S) ⁇ f ⁇ / sample anhydrous weight (g). . . Formula (1) Calculated by ⁇ wherein f: 0.1 mol / L potassium hydroxide titer ⁇ .
- (B ⁇ S) ⁇ f value is ( ⁇ )
- alkalinity is read as acidity.
- Liquid absorbency (amount (g / 100 cm 2 ))
- the liquid absorbency of the sheet-like structure was measured with respect to the absorption capacity when freely expanded according to EN137726-1. Specifically, the sheet-like structure is cut into 5 cm ⁇ 5 cm and placed in a petri dish. Thereafter, a pseudo exudate (described in EN137726-1) of 40 times the weight of the sample is heated to 37 ° C., added, and left in a 37 ° C. thermostat for 30 minutes.
- Liquid absorption (g / 100 cm 2 ) (AB) ⁇ 4
- A weight (g) in a dry state before immersion
- B weight after incubation for 30 minutes (g) ⁇ .
- Shape retention when immersed for a long time
- the sheet-like structure is cut into 5 cm ⁇ 5 cm and placed in a petri dish. Thereafter, a pseudo exudate (described in EN 13726-1) of 40 times the sample weight is added, and the mixture is allowed to stand at 37 ° C. for 3 days. Thereafter, the form of the sample is observed, and the strength is evaluated according to the following evaluation criteria.
- ⁇ The shape cannot be maintained.
- ⁇ The shape is maintained, but the fiber is entangled and dispersed by slight shaking.
- ⁇ The shape is maintained.
- an aqueous solution of sodium monochloroacetate containing ethanol (water 300 g, ethanol 960 g, sodium monochloroacetate 122.5 g) was added and stirred at 30 or 50 ° C. for 1 to 12 hours. Then, it dried and the sheet-like structure which was carboxymethylated was obtained.
- the sheet-like structure obtained above was adjusted to pH 6.0 to 8.0 with an acetic acid-containing aqueous ethanol solution (acetic acid: 37.5 g, distilled water: 375 g, ethanol: 875 g), and then once with 1375 g of a 70 wt% aqueous ethanol solution.
- the degree of protonation can be controlled by controlling the type of acid and the acid concentration. It was also found that the degree of protonation can be controlled regardless of the degree of substitution of the original fabric.
- Example 1 The liquid absorptivity and strength of Samples 2 to 10 having different degrees of protonation prepared in Reference Example 1 were evaluated.
- Aquacel registered trademark, manufactured by CONVATEC
- CONVATEC which is a commercially available product and a wound dressing using CMC
- Example 2 The liquid absorptivity and strength of Samples 8 and 14 to 17 having different degrees of substitution prepared in Reference Example 1 were evaluated. The evaluation results are shown in Table 4 below.
- the degree of substitution As the degree of substitution increased, the strength decreased. When the degree of substitution was 1.0 or more, it was found that the same protonation degree was too weak to be used. Further, the liquid absorption amount increases as the degree of substitution increases, and it can be seen that the liquid absorption amount is sufficient when the degree of substitution is 0.3 or more.
- Example 3 The strength of the samples 5, 19, and 20 made of different fiber materials prepared in Reference Example 1 and the shape retention during long-time immersion were evaluated. The evaluation results are shown in Table 5 below.
- Partially protonated all of the non-woven fabrics has sufficient strength.
- the fibers are strongly entangled even in a gelled state, so they are immersed for a long time.
- the form is difficult to collapse.
- Example 4 The liquid absorptivity and strength of Samples 22 to 25 having the heat treatment conditions of 120 ° C. and 3 h produced in Reference Example 1 were evaluated. The evaluation results are shown in Table 6 below.
- the strength can be sufficiently maintained when the protonation degree is 5% or more.
- wound healing is performed with a wound covering sheet containing partially protonated carboxymethylcellulose in the present invention, wound healing can be promoted by retaining a large amount of exudate.
- wound healing since it can be removed while maintaining its form, there is little remaining in the wound and there is no inflammation of the wound, so that it is possible to treat in a state where the influence on the human body is reduced as much as possible.
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- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Materials Engineering (AREA)
- Biomedical Technology (AREA)
- Vascular Medicine (AREA)
- Heart & Thoracic Surgery (AREA)
- Epidemiology (AREA)
- Hematology (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biochemistry (AREA)
- Materials For Medical Uses (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
Description
他方、以下の特許文献1には、CMCの置換度が0.5~1.0未満である可溶性創傷治癒止血セルロース繊維が記載されており、CMCが細胞接着促進作用を有することも記載されている。また、以下の特許文献2には、CMCを創部に適用した場合、創傷部の炎症等を引き起こす危険性のある不溶性の異物が残存することはないとも記載されている。
他方、CMC-Naを所定の濃度の酢酸、硝酸、塩酸等に浸漬することで、カルボキシメチル基にプロトンが結合したプロトン型のカルボキシメチルセルロース(以下、CMC-Hと略記する。)も開発されている。CMC-Hは強度が増す一方で、吸液性が一般のセルロース不織布と同程度であるという問題がある。他方、以下の特許文献3には部分的にプロトン化したCMCを癒着防止材に使用しているが、吸液性が悪く、創傷治癒には用いることができない。
[1]カルボキシメチル化された天然又は再生セルロース繊維を含有する創傷被覆材であって、セルロースを構成するグルコース単位中の水酸基の平均置換度が0.3以上1.0以下であり、かつ、カルボキシメチル基の5%以上80%以下がプロトン化されていることを特徴とする前記創傷被覆用シート。
[2]厚みが0.03mm以上5.0mm以下である、前記[1]に記載の創傷被覆用シート。
[3]密度が0.03g/cm3以上1.0g/cm3以下である、前記[1]又は[2]に記載の創傷被覆用シート。
[4]綿状、織物状又は不織布状の形態にある、前記[1]~[3]のいずれかに記載の創傷被覆用シート。
本明細書中、創傷被覆用シートとは、傷を保護し、外部からの感染を防いだり、傷の治りを早めたり、痛みを和らげるシート状の構造体を指す。例えば、絆創膏や褥瘡、熱傷などの湿潤療法に用いられる創傷被覆材などが挙げられるが、これらに限定されるものではない。
異物を除去し、重合度を調整したコットンリンターを銅アンモニウム溶液に溶解させた原液を細孔(原液吐出孔)を有した紡糸口金(紡口)から押し出し、水と共に漏斗内を落下させ、脱アンモニアさせることにより原液を凝固させつつ、延伸を行い、ネット上へ振り落としウェブ形成させる。この際、ネットを進行させながら進行方向と垂直方向へ振動させることにより、ネットへ振り落とされる繊維はサインカーブを描くことになる。紡糸時の延伸は100~500倍が可能であり、紡糸漏斗の形状と、その中を流下させる紡糸水量を変えることにより、延伸倍率の調整が任意に可能である。延伸倍率を変えることにより、単繊度や不織布の強度を変えることが可能である。また、紡糸水量や温度を変化させることに原液内に微量残留する低分子量セルロース、いわゆるヘミセルロースをコントロールすることも可能である。また、ネットの進行速度、振動幅を制御することにより、繊維配列方向を制御し、不織布としての強度や伸度等をコントロールすることが可能である。
まず、天然又は再生セルロース繊維の構造体をアルコール含有水酸化ナトリウム水溶液中でアルカリ状態を維持しながら、35℃で30分攪拌する。その後、反応容器中の試薬を排液した後、アルコールを含むモノクロロ酢酸ナトリウムを添加し、30℃~50℃で1~12時間撹拌する。その際の、置換度の制御は、反応液と構造体の浴比、温度、及び時間により制御する。また、その他の反応条件は、生産コスト等も考慮しながら適宜変更することができる。得られた構造体を酢酸含有エタノール水溶液でpH6.0~8.0に調整した後、70wt%、90wt%、100wt%エタノールでアルコール置換を行なう。少しでも水分を含むと硬くなるので、徐々にアルコール濃度を上げていくことで、アルコール置換を確実に行い、形態安定性を維持することができる。その後所定の濃度に調整した酸含有エタノール溶液に浸漬し、1時間撹拌し、70wt%、90wt%、100wt%エタノールでアルコール置換を行ない、乾燥させ、プロトン化したシート状構造体を得る。
酸への浸漬工程は、中和工程と同時に行ってもよい。すなわち、通常、中和工程後、酸浸漬工程を実施するため2工程必要であるが、中和工程と酸浸漬工程を同時に行い1工程で行ってもよい。
1.平均置換度の測定
(i)酸度、アルカリ度
試料(無水物)約1gを300mL三角フラスコに精密にはかりとり、水を約200mL加えて溶かす。これに0.05モル/L硫酸5mLをピペットで加え、10分間煮沸した後冷却して、フェノールフタレイン指示薬を加え、0.1モル/L水酸化カリウムで滴定する(SmL)。同時に空試験を行い(BmL)、下記式(1):
アルカリ度={(B-S)×f}/試料無水物重量(g) ... 式(1)
{式中、f:0.1モル/L水酸化カリウム力価}によって算出する。
ここで、(B-S)×f値が(-)の時にはアルカリ度を酸度と読み変える。
試料(無水物)0.5~0.7gを精密にはかり、ろ紙に包んで磁製ルツボ中で灰化する。冷却したのち、これを500mLビーカーに移し、水を約250mL、さらにピペットで0.05モル/L硫酸35mLを加えて30分間煮沸する。これを冷却し、フェノールフタレイン指示薬を加えて、過剰の酸を0.1モル/L水酸化カリウムで逆滴定して、下記式(2)、(3):
A=(a×f-b×f1)/試料無水物重量(g)-アルカリ度(又は+酸度) ... 式(2)
置換度=(162×A)/(10000-80×A) ... 式(3)
{式中、A:試料1g中の結合アルカリに消費された0.05モル/L硫酸の量(mL)、a:0.05モル/L硫酸の使用量(mL)、f:0.05モル/L硫酸の力価、b:0.1モル/L水酸化カリウムの滴定量(mL)、f1:0.1モル/L水酸化カリウムの力価}によって置換度を算出し、その平均値(N=3以上)を平均置換度とする。
シート状構造体を1cm2以上の面積に切断する。その後FT-IR(ATR)装置にセットし表面分析を行う。その後ATR補正、ベースライン補正、規格化を行い、1590cm-1の波長でのピーク高さを測定し、プロトン化前後でのピーク高さの比から下記式(4):
プロトン化度(%)=(A-B)/A×100 ... 式(4)
{式中、A:(プロトン化前のサンプルの1590cm-1のピーク高さ)-(5wt%塩酸で1h処理したサンプルの1590cm-1のピーク高さ)、B:(プロトン化後のサンプルの1590cm-1のピーク高さ)-(5wt%塩酸で1h処理したサンプルの1590cm-1のピーク高さ)}により、算出する。プロトン化前のサンプルとして、同等のサンプルを別途用意する。
シート状構造体の吸液性を、EN13726-1に準拠して、自由に膨張させた時の吸収能力について測定した。具体的にはシート状構造体を5cm×5cmに切断し、シャーレに配置する。その後、サンプル重量の40倍量の疑似滲出液(EN13726-1記載)を37℃に加温した後、添加し、37℃の恒温機内で30分間静置する。その後インキュベート前後の重量から下記式(5):
吸液量(g/100cm2)=(A-B)×4
{式中、A:浸漬前の乾燥状態での重量(g)、B:30分間インキュベート後の重量(g)}により、吸液量を算出する。
シート状構造体を5cm×5cmに切断し、シャーレに配置する。その後、サンプル重量の40倍量の疑似滲出液(EN13726-1記載)を添加し、37℃で30分間静置する。サンプルを取り出し、ピンセットでつまみ、以下の評価基準で強度を評価する。
×:形態を保つことができない
△:形態を保つことができるが、つかむことが難しい
〇:形態を保持しており、つかむことができるが、強く引っ張ると崩れる
◎:ある程度の強さの引張にも耐えることができる
シート状構造体を5cm×5cmに切断し、シャーレに配置する。その後、サンプル重量の40倍量の疑似滲出液(EN13726-1記載)を添加し、37℃で3日間静置する。その後、サンプルの形態を観察し、以下の評価基準で強度を評価する。
×:形態を保つことができない
△:形態を保持しているが、軽度の振盪で繊維の絡交が外れ分散する
〇:形態を保持している
[参考例1]
再生セルロース連続長繊維シート状構造体(キュプラシート状構造体)(幅20cm、目付80g/m2、厚み0.5mm、密度0.154g/m3)、リヨセル短繊維不織布、又はレーヨン短繊維不織布100gを反応容器に入れ、その後、水酸化ナトリウム含有エタノール水溶液(水:875g、エタノール875g、NaOH:162.5g)を加えた後、35℃で30分撹拌した。次に、反応容器中の試薬を排液した後、モノクロロ酢酸ナトリウム含有エタノール水溶液(水300g、エタノール960g、モノクロロ酢酸ナトリウム122.5g)を添加し、30又は50℃で1~12時間攪拌した。その後、乾燥させ、カルボキシメチル化したシート状構造体を得た。上述で得たシート状構造体を酢酸含有エタノール水溶液(酢酸:37.5g、蒸留水:375g、エタノール:875g)でpH6.0~8.0に調整した後、70wt%エタノール水溶液1375gで1回、90wt%エタノール水溶液1250gで1回洗浄し、100wt%エタノール1250gで2回アルコール置換を行なった。その後酢酸含有エタノール溶液1250g(1~100wt%)又は塩酸含有エタノール水溶液(2~5wt%)に浸漬し、1時間撹拌した後、70wt%エタノール水溶液1375gで1回、90wt%エタノール水溶液1250gで1回洗浄し、100wt%エタノール1250gで2回アルコール置換を行ない、乾燥させ、更に105℃、6h又は120℃、3hの条件下で熱風乾燥機に入れ、プロトン化したシート状構造体を得た。平均置換度(DS)、プロトン化度のデータをプロトン化条件と共に以下の表1に示す。
参考例1の方法で得られたプロトン化前のCMCシート状構造体(置換度0.55)から切片(2cm×1cm)を切り出し、50mLプラスチックチューブに、それぞれ10枚入れた。各チューブに、塩酸含有メタノール水溶液(1.2mol/L塩酸、90%メタノール)30mLを添加し、室温で10分間、30分間、1時間、インキュベートした。
インキュベート後、80%メタノール水溶液、100%メタノールで順次、洗浄後、乾燥し、プロトン化したシート状構造体を得た。プロトン化度のデータをプロトン化条件と共に以下の表2に示す。
参考例1で作製したプロトン化度の違うサンプル2~10の吸液性と強度を評価した。また、市販品である、CMCを用いた創傷被覆剤であるアクアセル(登録商標、CONVATEC社製)も評価した。評価結果を以下の表3に示す。
参考例1で作製したプロトン化度の違うサンプル1、11、12の吸液性と強度を評価した。また、市販品である、CMCを用いた創傷被覆剤であるアクアセル(登録商標、CONVATEC社製)も評価した。評価結果を以下の表3に示す。
参考例1で作製した置換度の違うサンプル8、及び14~17の吸液性と強度を評価した。評価結果を以下の表4に示す。
参考例1で作製した置換度の違うサンプル13、及び18の吸液性と強度も評価した。評価結果を以下の表4に示す。
参考例1で作製した繊維材料の違うサンプル5、19、及び20の強度と長時間浸漬時の形態保持性を評価した。評価結果を以下の表5に示す。
参考例1で作製した熱処理条件が120℃、3hのサンプル22~25の吸液性と強度を評価した。評価結果を以下の表6に示す。
参考例1で作製した熱処理条件が120℃、3hのサンプル21の吸液性と強度も評価した。評価結果を以下の表6に示す。
Claims (4)
- カルボキシメチル化された天然又は再生セルロース繊維を含有する創傷被覆材であって、セルロースを構成するグルコース単位中の水酸基の平均置換度が0.3以上1.0以下であり、かつ、カルボキシメチル基の5%以上80%以下がプロトン化されていることを特徴とする前記創傷被覆用シート。
- 厚みが0.03mm以上5.0mm以下である、請求項1に記載の創傷被覆用シート。
- 密度が0.03g/cm3以上1.0g/cm3以下である、請求項1又は2に記載の創傷被覆用シート。
- 綿状、織物状又は不織布状の形態にある、請求項1~3のいずれか1項に記載の創傷被覆用シート。
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AU2017218300B2 (en) | 2019-10-03 |
JP6537642B2 (ja) | 2019-07-03 |
JPWO2017138653A1 (ja) | 2018-09-06 |
BR112018016358A2 (pt) | 2019-02-26 |
CA3012973C (en) | 2020-06-02 |
US20210186763A1 (en) | 2021-06-24 |
CN108472403A (zh) | 2018-08-31 |
EP3415170B1 (en) | 2020-04-22 |
EP3415170A4 (en) | 2019-02-27 |
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