WO2015146840A1 - 高含水粘着性ゲル、高含水粘着性ゲル製造用組成物および電極パッド - Google Patents
高含水粘着性ゲル、高含水粘着性ゲル製造用組成物および電極パッド Download PDFInfo
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- WO2015146840A1 WO2015146840A1 PCT/JP2015/058517 JP2015058517W WO2015146840A1 WO 2015146840 A1 WO2015146840 A1 WO 2015146840A1 JP 2015058517 W JP2015058517 W JP 2015058517W WO 2015146840 A1 WO2015146840 A1 WO 2015146840A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
- A61B18/16—Indifferent or passive electrodes for grounding
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/24—Homopolymers or copolymers of amides or imides
- C09J133/26—Homopolymers or copolymers of acrylamide or methacrylamide
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
- A61B18/1402—Probes for open surgery
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- 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
- A61L24/00—Surgical adhesives or cements; Adhesives for colostomy devices
- A61L24/001—Use of materials characterised by their function or physical properties
- A61L24/0031—Hydrogels or hydrocolloids
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- 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
- A61L24/00—Surgical adhesives or cements; Adhesives for colostomy devices
- A61L24/04—Surgical adhesives or cements; Adhesives for colostomy devices containing macromolecular materials
- A61L24/043—Mixtures of macromolecular materials
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00053—Mechanical features of the instrument of device
- A61B2018/00059—Material properties
- A61B2018/00071—Electrical conductivity
- A61B2018/00077—Electrical conductivity high, i.e. electrically conducting
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00589—Coagulation
Definitions
- the present invention relates to a highly hydrous hydrogel having adhesiveness, and is suitable as an adhesive gel used by being attached to a living body such as an electrocardiogram electrode or a terminal for an electrotherapy device. Particularly, a large current such as a counter electrode plate for an electric knife is used.
- the present invention relates to a highly hydrous adhesive gel that hardly generates heat even when it flows, a method for producing the gel, an electrode pad using the gel, and a composition for producing the highly hydrous adhesive gel.
- Examples of devices that perform treatment using a high-frequency current include a high-frequency treatment device and an electric scalpel device.
- the high-frequency treatment device achieves muscle fatigue recovery and rehabilitation effects by passing a stimulation current from the electrode pad through the living body while the electrode pad is in close contact with the living body.
- the electric scalpel device is widely used in surgical operations, and with the electrode pad (counter electrode plate) in close contact with the living body, the scalpel tip is brought close to the living body and a high-frequency current is passed between the scalpel tip and the electrode pad.
- a high-frequency current is passed between the scalpel tip and the electrode pad.
- an object of the present invention is to provide a hydrogel that can be used as a counter electrode plate of an electric knife through which a high current flows, and that does not cause heat generation even when a high current flows. With the goal.
- an object of the present invention is to provide a highly water-containing adhesive gel that gives moderate adhesiveness even when applied to the skin of a human body. It is another object of the present invention to provide an electrode pad using such a high water content adhesive gel and a composition for producing such a high water content adhesive gel.
- a hydrogel comprising a polymer matrix composed of a copolymer of a polymerizable monomer and a crosslinkable monomer, water, a polyhydric alcohol, an electrolyte, polyacrylic acid, and polyvinyl alcohol,
- a hydrous adhesive gel comprising 40 to 70% by weight of water, 1.0 to 5.0% by weight of polyacrylic acid, and 0.5 to 5.0% by weight of polyvinyl alcohol in 100% by weight of the hydrogel.
- hydrogel containing a polymer matrix composed of a copolymer of a polymerizable monomer and a crosslinkable monomer, water, polyhydric alcohol, electrolyte, polyacrylic acid, and polyvinyl alcohol, the counter electrode of the electric knife It is a hydrogel that can be used for various applications such as various electrode pads such as plates and adhesive tapes.
- the water content is 40 to 70% by weight in 100% by weight of the entire hydrogel, the water content is higher than that of a general medical hydrogel and the heat conductivity is high. Therefore, an electrode pad that does not easily reach a high temperature even when a high current flows can be manufactured. Since it is an electrode pad that does not easily reach a high temperature, it is possible to suppress heat generation on the skin surface when it is applied to the skin. Further, when the water content is 45 to 65% by weight based on 100 parts by weight of the entire hydrogel, a highly water-containing adhesive gel having excellent adhesiveness can be obtained.
- the water-soluble polymer polyacrylic acid is contained in an amount of 1.0 to 5.0% by weight in 100% by weight of the entire hydrogel, a highly hydrous adhesive gel having appropriate tackiness can be obtained. Since it has appropriate adhesiveness, it is difficult to peel off when it is attached to a living body, and it can be easily peeled off after use. Further, since the water-soluble polymer polyvinyl alcohol is contained in an amount of 0.5 to 5.0% by weight in 100% by weight of the entire hydrogel, a highly water-containing adhesive gel having excellent cohesiveness and maintaining a stable gel state; can do.
- the polymer matrix was copolymerized with an amphiphilic monomer as a part of the polymerizable monomer contained therein in an amount of 0.5 to 5.0% by weight in 100% by weight of the entire hydrogel. If it is, the composition (formulation liquid) for producing a high water content adhesive gel can dissolve a photopolymerization initiator that is difficult to dissolve even if the water content is high, and reduces the generation of unreacted monomers. be able to.
- the amphiphilic monomer can be N, N-dimethyl (meth) acrylamide. Since the amphiphilic monomer is N, N-dimethyl (meth) acrylamide, the hydrophobic photopolymerization initiator can be easily dissolved.
- the electrolyte can include sodium sulfate. Since sodium sulfate is used as the electrolyte, it is possible to impart the necessary conductivity to the high water content adhesive gel. Moreover, if sodium halide is not contained, the possibility of corroding the conductive layer of the electrode pad can be reduced, and a highly hydrous adhesive gel used for the electrode pad can be obtained with confidence.
- the specific resistance of the highly water-containing adhesive gel can be 1.5 k ⁇ ⁇ cm or less. Since the specific resistance is 1.5 k ⁇ ⁇ cm or less, it is a highly hydrous adhesive gel that has a low resistance and does not easily reach a high temperature even when a high current flows. In addition, it is cut into a thickness of 1 mm, a length of 100 mm, and a width of 20 mm and attached to a bakelite plate, and the peeling force when peeled in a 90 ° direction with respect to the length direction at a speed of 300 mm / min is 1.5 N. / 20 mm or more. Since the peeling force under these predetermined conditions is 1.5 N / 20 mm or more, an electrode pad that does not easily peel off even when attached to the human skin and does not cause inconvenience such as peeling when using an electric knife is obtained. be able to.
- composition for producing a hydrogel comprising a polymerizable monomer and a crosslinkable monomer that are copolymerized to form a polymer matrix, water, a polyhydric alcohol, an electrolyte, polyacrylic acid, and polyvinyl alcohol.
- a high water content containing 40 to 70% by weight of water, 1.0 to 5.0% by weight of polyacrylic acid, and 0.5 to 5.0% by weight of polyvinyl alcohol in 100% by weight of the composition for producing hydrogel
- a composition for producing an adhesive gel is provided. Since such a composition for producing a high water content adhesive gel is used, the high water content adhesive gel can be easily obtained by crosslinking and curing the composition.
- an amphiphilic monomer may be contained in an amount of 0.5 to 5.0% by weight as a part of the polymerizable monomer.
- high water content adhesiveness by mixing polymerizable monomer, crosslinkable monomer, amphiphilic monomer, water, polyhydric alcohol, electrolyte, polyacrylic acid, polyvinyl alcohol, and photopolymerization initiator Including the step 1 of producing a composition for producing a gel and the step 2 of polymerizing and crosslinking the monomer component in the composition for producing a highly hydrous adhesive gel, and the composition 100 for producing a highly hydrous adhesive gel.
- the water content is 40 to 70% by weight
- the polyacrylic acid content is 1.0 to 5.0% by weight
- the polyvinyl alcohol content is 0.5 to 5.0% by weight.
- the present invention provides a method for producing a highly hydrous adhesive gel, wherein the content of the amphiphilic monomer is 0.5 to 5.0% by weight. By this production method, a desired high water content adhesive gel can be easily produced.
- the amphiphilic monomer can be N, N-dimethyl (meth) acrylamide.
- the hydrophobic photopolymerization initiator is easily dissolved and the generation of unreacted monomers is reduced, a desired high water content adhesive gel can be easily prepared.
- an electrode pad used as an electrode for flowing a high-frequency current to a living body comprising a surface material, a conductive layer laminated on the surface material, and a conductive adhesive gel layer covering the conductive layer
- the conductive adhesive gel layer can be an electrode pad that is any one of the above-mentioned highly water-containing adhesive gels. Since any one of the above highly water-containing adhesive gels is included, it is possible to obtain an electrode pad that does not easily become high temperature even when a high current flows and is difficult to peel off. And since it is an electrode pad which is hard to become high temperature, when sticking on skin and using it, the heat_generation
- the highly water-containing adhesive gel and electrode pad of the present invention even if a high current flows, it is difficult to reach a high temperature and can be used as a counter electrode plate of an electric knife through which a high current flows. And the heat_generation
- FIG. 2 is a cross-sectional view of the electrode pad of FIG. 1 taken along the line SA-SA.
- the high moisture content adhesive gel of the present invention is a polymer matrix comprising a copolymer of a polymerizable monomer and a crosslinkable monomer, water, a polyhydric alcohol, an electrolyte, polyacrylic acid, and a hydrolyzate containing polyvinyl alcohol. It is a gel.
- Each component which comprises this high water content adhesive gel is demonstrated in detail below.
- the polymerizable monomer is not particularly limited as long as it is a monomer having one polymerizable carbon-carbon double bond in the molecule.
- Non-electrolyte acrylamide derivatives such as (meth) acrylamide, acryloylmorpholine; tertiary butyl acrylamide sulfonic acid (TBAS) and / or its salt, N, N-dimethylaminoethylacrylamide (DMAEAA) hydrochloride, N, N-dimethylamino Electrolyte acrylamide derivatives such as propylacrylamide (DMAPAA) hydrochloride; (meth) acrylic acid, maleic acid, itaconic acid, sulfopropy
- the polymerizable monomer preferably includes at least an amphiphilic monomer.
- An amphiphilic monomer is a monomer having polymerizability that is soluble in water and in a solvent immiscible with water (non-aqueous solvent).
- amphiphilic monomer monomers represented by the following formulas (I) and (II) can be preferably used. Among these, a monomer represented by the following formula (I) is preferable.
- R 11 represents hydrogen or a methyl group.
- R 12 and R 13 are the same or different and each represents hydrogen or a hydrocarbon group which may contain a hetero atom, and forms a ring with a nitrogen atom. May be.
- Examples of the hydrocarbon group that may contain a hetero atom of R 12 and R 13 include a saturated or unsaturated monovalent group.
- the carbon number of R 12 and R 13 is preferably 1 to 10, more preferably 1 to 6, and still more preferably 1 to 3. It may be any of linear, branched, and cyclic, and examples thereof include an alkyl group, alkenyl group, and cycloalkyl group that may have a hetero atom.
- a divalent hydrocarbon group that may contain a hetero atom is formed in R 12 and R 13 .
- the divalent hydrocarbon group which may contain a heteroatom preferably has 3 to 12 carbon atoms, more preferably 3 to 10 carbon atoms, still more preferably 3 to 6 carbon atoms.
- the chain may be linear, branched, or cyclic, and examples thereof include an alkylene group, an alkenylene group, and a cycloalkylene group that may have a hetero atom.
- the hetero atom in R 12 and R 13 is not particularly limited, and examples thereof include oxygen and sulfur.
- R 12 and R 13 are preferably an alkyl group which may contain a hetero atom, and more preferably an alkyl group having 1 to 3 carbon atoms.
- R 21 represents hydrogen or a methyl group.
- R 22 represents a divalent hydrocarbon group which may contain a hetero atom.
- R 22 may be a divalent hydrocarbon group which may contain a hetero atom of R 22 , or a saturated or unsaturated group.
- R 22 preferably has 3 to 12 carbon atoms, more preferably 3 to 10 carbon atoms, and still more preferably 3 to 6 carbon atoms.
- the chain may be linear, branched, or cyclic, and examples thereof include an alkylene group, an alkenylene group, and a cycloalkylene group that may have a hetero atom.
- the hetero atom in R 22 is not particularly limited, and examples thereof include oxygen and sulfur.
- R 22 is preferably an alkylene group which may contain a hetero atom, more preferably an alkylene group having 3 to 6 carbon atoms.
- amphiphilic monomer examples include N-ethyl (meth) acrylamide, N-isopropyl (meth) acrylamide, Nn-propyl (meth) acrylamide, N-cyclopropyl (meth) acrylamide, N -Methyl-N-ethyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N-methyl-N-isopropyl (meth) acrylamide, N-methyl-Nn -Propyl (meth) acrylamide; N-vinylpyrrolidone, N-vinylcaprolactam, N-isopropenylpyrrolidone, N-isopropenylcaprolactam; N- (meth) acryloylpyrrolidine, N- (meth) acryloylpiperidine; N-1-methoxy Methylpropyl (meth)
- the content of the amphiphilic monomer is preferably 0.5 to 5.0% by weight in 100% by weight of the entire gel.
- the photopolymerization initiator added in the preparation stage of the composition for producing a highly water-containing adhesive gel (hereinafter also referred to as “pre-gelling liquid” or simply “blending liquid”) is not dissolved. There is a possibility that it will not progress sufficiently.
- the gel becomes soft and may cause gel breakage. More preferably, it is 1.0 to 3.0% by weight.
- the crosslinkable monomer is not particularly limited as long as it is a monomer having two or more carbon-carbon double bonds having polymerizability in the molecule.
- These crosslinkable monomers can be used alone or in combination.
- the ratio (monomer content) of the polymerizable monomer and the crosslinkable monomer in 100% by weight of all components excluding water is preferably 10 to 70% by weight, more preferably 10%. ⁇ 50% by weight.
- the ratio of the polymerizable monomer and the crosslinkable monomer is preferably 0.01 to 0.5% by weight of the crosslinkable monomer in 100% by weight of the polymerizable monomer. Preferably, it is 0.05 to 0.25% by weight.
- the crosslinkable monomer is preferably 0.01% by weight or more, and it is preferable to have flexibility so as not to impair the shape-retaining property. 0.5% by weight or less is preferable because tackiness is easily obtained.
- the composition for producing a highly hydrous adhesive gel may have its constituent components in either a one-component or two-component state.
- the high water content adhesive gel contains at least two water-soluble polymers, one of which is polyacrylic acid. This is because the addition of polyacrylic acid can impart the necessary tackiness to the hydrogel.
- the amount of polyacrylic acid added is 1.0 to 5.0% by weight in 100% by weight of hydrogel.
- the adhesive strength is low and the adhesiveness to a living body is poor when it is used as an electrode pad, and it may be peeled off during use.
- it exceeds 5.0% by weight the viscosity of the pre-gelling compound solution becomes too high and handling becomes difficult.
- it is more preferably 3.0% by weight or more in consideration of adhesiveness with a metal such as aluminum which is a conductive layer.
- polyvinyl alcohol Another type of water-soluble polymer is polyvinyl alcohol.
- Appropriate cohesion can be imparted to the hydrogel by adding polyvinyl alcohol.
- polyvinyl alcohols polyvinyl alcohols composed of linear polymers are preferable. This is because the water in which it is dissolved is retained in the polymer matrix, so that the mechanical strength is easily improved.
- the addition amount of polyvinyl alcohol is 0.5 to 5.0% by weight in 100% by weight of hydrogel.
- the hydrogel may be inferior in cohesiveness and adhesive strength may be lowered.
- it exceeds 5.0% by weight the solubility during preparation of the pre-gelation compound solution is poor and it is difficult to produce a desired hydrogel.
- the polymerization degree of polyvinyl alcohol is preferably 500 to 3000 in terms of viscosity average polymerization degree.
- the degree of polymerization is less than 500, it may be difficult to obtain the effect of improving the mechanical strength.
- the degree of polymerization exceeds 3000, the viscosity increase of the pre-gelling liquid mixture becomes large and a uniform liquid mixture cannot be prepared. There is a case.
- the saponification degree of polyvinyl alcohol is preferably 80 to 98%. If the degree of saponification is less than 80%, the solubility during preparation of the blended liquid is improved, but the stability of the obtained hydrogel may be lowered. On the other hand, if the degree of saponification exceeds 98%, the solubility may be extremely lowered and preparation of the blended liquid may be difficult.
- Polyhydric alcohols include diols such as ethylene glycol, propylene glycol and butanediol, polyhydric alcohols such as glycerin, pentaerythritol and sorbitol, and polyhydric alcohol condensations such as polyethylene glycol, polypropylene glycol, diglycerin and polyglycerin. And polyhydric alcohol modified products such as polyoxyethylene glycerin can be used. These polyhydric alcohols can be used alone or in combination. Among these polyhydric alcohols, it is preferable to use liquid polyhydric alcohols in a temperature range where hydrogel is actually used (for example, around 20 ° C. when used indoors).
- the content of the polyhydric alcohol is preferably 20 to 80% by weight, more preferably 30 to 60% by weight, when the components other than water in the hydrogel are 100% by weight. This is because when the amount of polyhydric alcohol added is in such a range, the physical property change due to drying of the obtained hydrogel is small, and high adhesive strength can be obtained.
- the electrolyte added to increase the conductivity of the hydrogel includes minerals such as acids other than alkali metals such as lithium, sodium and potassium and halides of alkaline earth metals such as magnesium and calcium, minerals such as carbonic acid, sulfuric acid and phosphoric acid. Acid salts, organic salts, ammonium salts and the like can be used. Among these, when used as an electrode pad or the like, neutral to weakly acidic ones are preferable. By not containing halogen, the possibility of corroding a metal such as aluminum used as the conductive layer can be reduced even when used as an electrode pad. For this reason, sodium sulfate is one of the preferred electrolytes.
- the electrolyte content needs to be low impedance when used as an electrode pad, and is preferably 0.1 to 10% by weight when the component other than water in the hydrogel is 100% by weight. 2 to 8% by weight is more preferable. If it exceeds 10% by weight, it may be difficult to dissolve the electrolyte in the formulation solution for gel production. If it is less than 0.1% by weight, the resistance may increase when the hydrogel is dried or the like. Because there is.
- the water content is 40 to 70% by weight, preferably 50 to 65% by weight, in 100% by weight of the hydrogel. It is considered that the higher the moisture content, the less likely it will be to become high temperature when used as an electrode pad. However, if it exceeds 70% by weight, the amount of moisture will be too high, causing water leakage, and lowering the adhesiveness. Is likely to occur. Moreover, if it is less than 40 weight%, when using as a counter electrode plate, it may become high temperature. If the counter electrode plate is not easily heated, heat generation on the skin surface can be suppressed when the electrode plate is used by being attached to the skin.
- the pre-gelling compound liquid usually contains a photopolymerization initiator.
- a photopolymerization initiator those that are cleaved by ultraviolet rays or visible rays to generate radicals are suitable, and examples include ⁇ -hydroxy ketone, ⁇ -amino ketone, benzyl methyl ketal, bisacylphosphine oxide, and metallocene.
- 2-hydroxy-2-methyl-1-phenyl-propan-1-one product name: Darocur 1173, manufactured by Ciba Specialty Chemicals
- 1-hydroxy-cyclohexyl-phenyl-ketone product) Name: Irgacure 184, manufactured by Ciba Specialty Chemicals Co., Ltd., 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-propan-1-one (Product name: Irgacure 2959, Ciba Specialty Chemicals Co., Ltd.), 2-Methyl-1-[(methylthio) phenyl] -2-morpholinopropan-1-one (Product name: Irgacure 907, Ciba Specialty Chemicals Co., Ltd.), 2-Benzyl- 2-Dimethylamino-1- (4-morpholinophenyl) -butyl 1-one (product name: Irgacure 369, manufactured by Ciba Specialty Chemicals Co
- dissolves 5 weight part or more at 25 degreeC with respect to 100 weight part of amphiphilic monomers used for the compounding liquid before gelatinization as a photoinitiator.
- compatibility with the amphiphilic monomer is enhanced, and the photopolymerization initiator is sufficiently dissolved even if the water content is large.
- the unreacted monomer in copolymerization decreases and a desired hydrogel can be produced.
- it is a compound that dissolves 10 parts by weight or more, and more preferably 50 parts by weight or more.
- Irgacure 127 and Irgacure 2959 are preferable.
- the non-aqueous photopolymerization initiator is difficult to dissolve in the pre-gelation liquid mixture with high water content, but compatibility with amphiphilic monomers, especially N, N-dimethyl (meth) acrylamide, is good. It is.
- the addition amount of the photopolymerization initiator is preferably 0.01% by weight or more in 100% by weight of the pre-gelation mixed solution in order to sufficiently perform the polymerization reaction and reduce the residual monomer. In order to prevent discoloration (yellowing) and odor due to the reaction residue of the agent, it is preferably 1.0% by weight or less. More preferably, it is 0.05 to 0.5% by weight.
- a pH adjuster can be included in the pre-gelling compound solution. This is because if the pH is excessively inclined to the acidic side, the conductive layer in the case of the electrode pad may be corroded.
- pH adjustment for example, citric acid or sodium citrate can be added.
- the hydrogel may contain other additives as necessary.
- Other additives include antiseptics, bactericides, antifungal agents, rust inhibitors, antioxidants, antifoaming agents, stabilizers, fragrances, surfactants, colorants, medicinal ingredients (for example, anti-inflammatory agents, Vitamins, whitening agents, etc.).
- the high water content adhesive gel can be obtained by stirring and mixing predetermined components to prepare a composition for producing a high water content adhesive gel, and then molding it into an arbitrary shape simultaneously with the polymerization crosslinking reaction.
- high water content adhesiveness by mixing polymerizable monomer, crosslinkable monomer, amphiphilic monomer, water, polyhydric alcohol, electrolyte, polyacrylic acid, polyvinyl alcohol, and photopolymerization initiator Including a step 1 for producing a composition for gel production and a step 2 for polymerizing and cross-linking the monomer component in the composition for producing a highly water-containing adhesive gel, water, polyacrylic acid, polyvinyl alcohol, amphiphile High moisture content adhesive gel can be manufactured by the manufacturing method which mix
- a photopolymerization initiator is dissolved in an amphiphilic monomer, and then the amphiphilic monomer, polymerizable monomer, crosslinkable monomer is dissolved. It can be carried out by mixing and stirring a monomer, water, polyhydric alcohol, electrolyte, polyacrylic acid, polyvinyl alcohol and the like so as to eliminate the solid component.
- the resulting blended solution is polymerized and cross-linked with the monomer components contained, for example, by pouring into a mold to form a polymer matrix composed of a copolymer of a polymerizable monomer and a cross-linkable monomer.
- a high water content adhesive gel in a desired shape can be obtained.
- a liquid mixture can be poured between the surface material and the cover film, and a polymerization crosslinking reaction can be carried out in a state of maintaining a constant thickness to obtain a sheet-like highly hydrous adhesive gel.
- a thin film-like highly water-containing adhesive gel can be obtained by thinly coating the compounded solution on a surface material or a cover film and causing a polymerization crosslinking reaction.
- the integrated irradiation amount irradiated to the compounded liquid is 1000 mJ / cm 2 or more.
- the integrated irradiation amount may be 1000 mJ / cm 2 or more, and if the integrated irradiation amount is 2000 mJ / cm 2 or more, the residual monomer amount in the hydrogel can be reduced to 100 ppm or less. More preferable.
- the upper limit of the integrated irradiation amount is not necessarily limited, and it is sufficient that the irradiation amount is sufficient for the polymerization reaction to proceed sufficiently. However, excessive irradiation may cause problems such as an increase in equipment size, use of extra energy, and the need to remove generated heat. Is desirable.
- the high water content adhesive gel thus obtained retains safety and adhesiveness to the skin, and can easily impart conductivity due to the addition of electrolyte and high water content. It can be used suitably.
- FIG. 1 is a plan view of the electrode pad 11
- FIG. 2 is a cross-sectional view taken along the line SA-SA in FIG.
- This electrode pad 11 has a conductive layer 13 as shown in FIG. 2 on a surface material 12 having a planar shape having a tongue piece 12a on one side of a substantially square shape as shown in FIG.
- the high water content adhesive gel 14 is laminated. Further, the surface of the high water content adhesive gel 14 is covered with a cover film 15.
- a resin film having regularity and flexibility can be used as the surface material 12.
- examples thereof include non-conductive films such as polyethylene terephthalate film, polypropylene film, and polyethylene film, paper, nonwoven fabric, and foam sheet. be able to.
- decorative printing can also be performed.
- the thickness of the surface material 12 is preferably about 10 to 200 ⁇ m from the viewpoint of handleability.
- the conductive layer 13 is laminated and integrated in a portion excluding the outer peripheral edge portion of the surface material 12, and can be connected to the lead wire through the tongue piece portion 12a.
- the conductive layer 13 is not particularly limited as long as it is flexible, can be deformed along the surface of the living body, and can be formed of a material having a low electrical resistance.
- a metal such as an aluminum foil, a stainless steel foil, a copper foil, or a nickel foil.
- a composite film or the like in which a conductive material such as carbon, silver, or silver chloride is attached to a foil or a synthetic resin film in layers through a binder such as a synthetic resin can be used.
- a metal foil is preferable from the viewpoint of conductivity
- an aluminum foil is more preferable from the viewpoint of lightness, price, safety, workability, and the like.
- the conductive layer 13 can be laminated on the surface material 12 by laminating the surface material 12 and the conductive layer 13. However, the conductive layer 13 can be integrated with an adhesive or the like. It can also be integrated by lamination.
- the high water content adhesive gel 14 covering the conductive layer 13 is the hydrogel described above, and is a hydrogel having the property of having both a high water content and adhesiveness to the skin.
- the high water content adhesive gel 14 is formed by applying a pre-gelation mixed solution on the surface material 12 on which the conductive layer 13 is laminated and cross-linking, or by separately forming a high water content adhesive property on the resin film as a coating film. It can also be produced by superimposing the gel 14 on the surface material 12.
- the thickness of the high water content adhesive gel 14 is preferably 0.5 to 1.2 mm. This is because if the thickness is less than 0.5 mm, the thickness is too thin and there is a possibility that the high frequency current from the electric knife may cause a high temperature. Is wasted.
- a cover film 15 is further provided on the high water content adhesive gel 14, and the high water content adhesive gel 14 is protected by covering the high water content adhesive gel 14 to prevent drying.
- the cover film 15 is peeled off, and the high water content adhesive gel 14 side is attached to the human skin.
- the electrode pad 11 thus obtained has a small specific resistance and can be 0.1 to 3.0 k ⁇ ⁇ cm, preferably 1.5 k ⁇ ⁇ cm or less. If the specific resistance is reduced, it can be used as a counter electrode of an electric knife, and if it is 1.5 k ⁇ ⁇ cm or less, the temperature does not rise more than necessary even when a large current flows, and it does not cause low-temperature burns. It can be used as a counter electrode. Moreover, it can be set as the electrode pad 11 which has the adhesiveness with respect to a biological body, and does not peel off easily or it is hard to peel off conversely.
- the electrode pad 11 can be used not only as a counter electrode plate of an electric scalpel device but also as an electrode of a high-frequency treatment device, such as a ground electrode of a device that performs treatment or monitoring using a high-frequency current. It can be widely used as a sensing electrode.
- the high moisture content adhesive gel can be applied to surgical tape, catheters, infusion tubes, sensors for fixing sensors, poultices, wound dressings, and living bodies.
- an adhesive material to be used it can be suitably used as an industrial adhesive material such as a building material or an electronic material.
- Glycerol as the monohydric alcohol
- PAA polyacrylic acid
- PVA polyvinyl alcohol
- VP-18 saponification degree 88%, trade name: VP-18, manufactured by Nihon Acetate / Poval
- sodium sulfate as the electrolyte Irgacure 2959 (IR2959, “trade name” manufactured by Ciba Specialty Chemicals, solubility of 100 parts by weight of N, N-dimethylacrylamide at 25 ° C.
- Irgacure 127 (IR127, “Product”) “Name”, Ciba Specialty Chemicals, N, N-dimethyl at 25 ° C
- Irgacure 184 (IR184, “trade name” manufactured by Ciba Specialty Chemicals, solubility of 330 parts by weight of N, N-dimethylacrylamide at 100 ° C. at 25 ° C.)
- citric acid, sodium citrate, and water as a solvent are mixed in the blends (parts by weight) shown in Tables 1 and 2 below, dissolved and stirred, and the gels of the examples and comparative examples are mixed. A pre-formulation liquid was obtained.
- the pre-gelling liquid mixture (liquid material) was dropped onto a polyethylene terephthalate film (cover film) having a thickness of 100 ⁇ m and coated on one surface with silicone.
- a silicone-coded polyethylene terephthalate film (another film) having a thickness of 40 ⁇ m was prepared, and the silicone-coated surface of this film was applied onto the pre-gelling premix solution.
- these films sandwiching the pre-gel compounded liquid from above and below are passed through a space set at a distance of 0.84 mm to spread the pre-gelled compounded liquid, and then ultraviolet rays are applied by a metal halide lamp.
- Example temperature in “Exothermic temperature” in Tables 1 and 2, the exothermic temperature was measured when each hydrogel sample was used as a counter electrode (electrode pad) of an electric knife, and the result was shown. More specifically, it is as follows. The polyethylene film was peeled off from the hydrogel sample of each sample to prepare a conductive layer composed of a laminate of an aluminum foil (9 ⁇ m) and a PET film, and the aluminum foil side was attached to the gel. Furthermore, a surface material layer (single-sided pressure-sensitive adhesive) was stuck on the laminated product. Then, a test counter electrode plate was fabricated by punching into a 109 cm 2 square shape.
- this counter electrode plate was affixed on the back, and one sheet of this counter electrode plate was affixed inside the thigh which shaved hair previously. Then, assuming an electric knife, a current of 1.5 A was applied for 1 minute from the counter electrode attached to the back, and the current was recovered from the counter electrode attached to the thigh. Thereafter, the counter electrode attached to the inside of the thigh was peeled off, and the skin surface temperature on which the counter electrode was attached was photographed with a thermograph. Before the measurement, the skin temperature of the same site was photographed with a thermograph, and the skin temperature before the measurement was subtracted from the maximum skin fever temperature of the photographed image to obtain a fever temperature.
- a more specific measuring method is as follows. Each sample (hydrogel sample) was cut into a strip of 20 to 100 mm, and then the polyethylene film was peeled off and attached to the AL film. The 2 kg roller was reciprocated once to bring the high water content adhesive gel into close contact with the AL film, and left at room temperature for 2 days. Then, the backing material was affixed on the surface of the highly water-containing adhesive gel that was peeled off and exposed. On the other hand, the AL film side was bonded to SUS using a double-sided tape.
- Comparative Example 1 In Comparative Example 1 with a low water content of 20 parts by weight, the exothermic temperature exceeds 10 ° C. and the intended purpose cannot be achieved, and in Comparative Example 8 with a high water content of 80 parts by weight, the gel becomes brittle and the tackiness is poor. It was. In Comparative Example 7 having a water content of 75 parts by weight, the exothermic temperature was suppressed, but at 90 ° adhesion, the value was lower than 0.98 N / 20 mm, and the adhesion was slightly poor.
- Example 7 which did not contain N, N-dimethylacrylamide and Irgacure 127, residual monomers were produced, and there were some concerns about odor and skin irritation.
- Comparative Example 6 In Comparative Example 6 in which no polyacrylic acid was added, the tackiness was considerably low, and in Comparative Example 3 in which 10 parts by weight of polyacrylic acid was added, the viscosity of the blended solution was too high and it was difficult to mold into a predetermined shape. Further, Comparative Example 2 in which the amount of polyacrylic acid added was 1 part by weight was slightly inferior in adhesiveness to the aluminum foil, although the characteristics of the highly water-containing adhesive gel were generally excellent.
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Abstract
Description
こうした装置のうち電気メス装置に用いられる電極パッドとしては、例えば、特許第3714982号公報(特許文献1)に記載がある。
該ハイドロゲル全100重量%中、水を40~70重量%、ポリアクリル酸を1.0~5.0重量%、ポリビニルアルコールを0.5~5.0重量%含む高含水粘着性ゲルを提供する。
さらに水溶性ポリマーのポリビニルアルコールを、ハイドロゲル全体の100重量%中、0.5~5.0重量%含むものとしたため、凝集性に優れ安定的なゲル状態を保持する高含水粘着性ゲルとすることができる。
電解質には硫酸ナトリウムを含むものとすることができる。電解質に硫酸ナトリウムを用いたため、高含水粘着性ゲルに必要な導電性を付与することができる。また、硫酸ナトリウムを用いてハロゲン化物を含有しなければ、電極パッドの導電層を腐食する可能性を少なくして、安心して電極パッドに用いる高含水粘着性ゲルとすることができる。
また、厚さ1mm、長さ100mm、幅20mmに切り出してベークライト板に対して貼り付け、300mm/分の速度で長さ方向に対して90°方向に剥離させた際の剥離力を1.5N/20mm以上とすることができる。こうした所定の条件での剥離力を1.5N/20mm以上としたため、人体の皮膚に貼着しても簡単には剥がれることなく、電気メスの使用時に剥離等の不都合が生じない電極パッドを得ることができる。
上記何れかの高含水粘着性ゲルを含むため、高電流が流れても高温になりにくく、剥がれにくい電極パッドとすることができる。そして、高温になりにくい電極パッドであるので、皮膚に貼付して使用する際に、その皮膚表面の発熱を抑制することができる。
また、本発明の高含水粘着性ゲルと電極パッドによれば、適度な粘着力を有し、人体の皮膚へ貼付しても好適な粘着性を与えることができる。
そして本発明の高含水粘着性ゲル製造用組成物によれば、高電流が流れても高温になりにくく粘着性に優れた高含水粘着性ゲルを簡単に製造することができる。
この高含水粘着性ゲルを構成する各成分について以下に詳しく説明する。
高含水粘着性ゲル製造用組成物は、その構成成分を1液又は2液のどちらの状態にしてもよい。
ポリビニルアルコールの中でも直鎖状高分子で構成されているポリビニルアルコールが好ましい。それを溶解した水が高分子マトリックス内に保持されることによって機械的強度を向上させやすいからである。
これら多価アルコールの中で、ハイドロゲルを実際に使用する温度領域(例えば室内で使用する場合は20℃前後)で液状の多価アルコールを使用することが好ましい。
ハロゲンを含まないことで、電極パッドとして利用する場合に、導電層として用いるアルミニウム等の金属を腐食させる可能性を少しでも低下させることができる。そのため、硫酸ナトリウムは好ましい電解質の一つである。
光重合開始剤は、紫外線や可視光線で開裂し、ラジカルを発生するものが好適であり、α-ヒドロキシケトン、α-アミノケトン、ベンジルメチルケタール、ビスアシルフォスフィンオキサイド、メタロセン等が挙げられる。より具体的には、2-ヒドロキシ-2-メチル-1-フェニル-プロパン-1-オン(製品名:ダロキュア1173,チバスペシャリティーケミカルズ株式会社製)、1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(製品名:イルガキュア184,チバスペシャリティーケミカルズ株式会社製)、1-[4-(2-ヒドロキシエトキシ)-フェニル]-2-ヒドロキシ-2-メチル-プロパン-1-オン(製品名:イルガキュア2959,チバスペシャリティーケミカルズ株式会社製)、2-メチル-1-[(メチルチオ)フェニル]-2-モルフォリノプロパン-1-オン(製品名:イルガキュア907,チバスペシャリティーケミカルズ株式会社製)、2-ベンジル-2-ジメチルアミノ-1-(4-モルフォリノフェニル)-ブタン-1-オン(製品名:イルガキュア369,チバスペシャリティーケミカルズ株式会社製)、2-ヒロドキシ-1-{4-[4-(2-ヒドロキシ-2-メチル-プロピオニル)-ベンジル]フェニル}-2-メチル-プロパン-1-オン(製品名:イルガキュア127,チバスペシャリティーケミカルズ株式会社製)等が挙げられる。これらは、単独または複数を組み合わせて使用することが可能である。
図1は、電極パッド11の平面図であり、図2は、図1のSA-SA線断面図である。この電極パッド11は、図1で示すように、略四角形状の一辺に舌片部12aを有する平面形状からなる表面材12上に、図2で示すように導電層13を有し、その上に高含水粘着性ゲル14が積層した構成をしている。また、高含水粘着性ゲル14の表面はカバーフィルム15で被覆されている。
表面材12の厚さは、取扱い性の観点から10~200μm程度が好適である。
この導電層13は、可撓性を有して生体表面に沿って変形でき且つ電気抵抗の小さいもので形成できれば特に限定されず、例えば、アルミニウム箔、ステンレス箔、銅箔、ニッケル箔等の金属箔、合成樹脂フィルム上にカーボン、銀、塩化銀等の導電性材料を合成樹脂等のバインダーを介して層状に付着させた複合フィルム等を用いることができる。こうした中では導電性の観点から金属箔が好ましく、軽さや金額、安全性、加工性等の観点からアルミニウム箔がより好ましい。
表面材12への導電層13の積層は、表面材12と導電層13をラミネートすることで積層一体化することができるが、接着剤等による一体化や導電層13上への樹脂塗液の積層によっても一体化することができる。
高含水粘着性ゲル14の厚さは、0.5~1.2mmとすることが好ましい。0.5mm未満では、厚みが薄すぎて、電気メスによる高周波電流により高温になる可能性があるからであり、1.2mmを超えても電極パッド11としての効果に差違が生じないため材料費が無駄になる。
なお、この電極パッド11は、電気メス装置の対極板として用いることができるだけでなく、高周波治療器の電極として用いることができるなど、高周波電流を用いて治療またはモニタリングなどを行なう装置のアース電極やセンシング電極として広く用いることができる。
実施例または比較例となるハイドロゲルサンプルを作製して、その粘着力、比抵抗を測定した。以下、詳細に説明する。
重合性単量体としてアクリルアミド(AAM)、N,N-ジメチルアクリルアミド(DMAA(両親媒性単量体))を、架橋性単量体としてN,N’-メチレンビスアクリルアミド(MBAA)を、多価アルコールとしてグリセリンを、水溶性ポリマーとしてポリアクリル酸(PAA)、ポリビニルアルコール(PVA、ケン化度88%、商品名:日本酢ビ・ポバール社製、VP-18)を、電解質として硫酸ナトリウムを、光重合開始剤としてイルガキュア2959(IR2959、「商品名」チバ・スペシャリティーケミカルズ社製、25℃でのN,N-ジメチルアクリルアミド100重量部に対する溶解度80重量部)、イルガキュア127(IR127、「商品名」チバ・スペシャリティーケミカルズ社製、25℃でのN,N-ジメチルアクリルアミド100重量部に対する溶解度120重量部)、イルガキュア184(IR184、「商品名」チバ・スペシャリティーケミカルズ社製、25℃でのN,N-ジメチルアクリルアミド100重量部に対する溶解度330重量部)を、添加剤として必要によりクエン酸、クエン酸ナトリウムを、そして溶媒として水を、それぞれ次の表1~2に示す配合(重量部)で混合し、溶解攪拌して、各実施例、比較例のゲル化前配合液を得た。
<配合液の適性>
表1~2の「配合液溶解性」においては、得られた配合液について各種添加成分が溶解し固形物が見られない場合に“○”、液濁りがあったり、高粘度になりすぎて塗工が困難であるなどの問題がある場合を“×”とした。
表1~2の「90°粘着」においては、90°粘着力を測定した結果を示す。
具体的な試験方法は、各試料(ハイドロゲルサンプル)を20~100mmの短冊状に切り出した後、ポリエチレンフィルムを剥がし裏打ち材を貼付した。その後、カバーフィルムを剥がし、厚さ1mm、長さ100mm、幅20mmのサンプルをベークライト板に貼付し、2kgのローラーで1往復させた後、TENSILON(ORIENTEC社製)にセットした。この後、JIS-Z0237に準じて、300mm/分の速度でサンプルの長さ方向を0°とした場合に90°方向に剥離させた際の剥離力を粘着力として測定した。
表1~2の「比抵抗」においては、比抵抗を測定した結果を示す。
各試料(ハイドロゲルサンプル)を20mm×20mmの角型に切り出し、この試験片の両面にステンレス板を貼り合せ、ステンレス板間に1kHz、10mAの電流を流した時のインピーダンスを測定した。得られたインピーダンス(I)と、試験片の面積(S)及び厚み(d)から以下の式により、比抵抗を算出した。
比抵抗(Ω・cm)=I(Ω)/d(cm)×S(cm2)
表1~2の「発熱温度」においては、上記各ハイドロゲルサンプルを電気メスの対極板(電極パッド)として利用した場合の発熱温度を測定し、その結果を示した。
より具体的には次のとおりである。上記各試料のハイドロゲルサンプルからポリエチレンフィルムを剥がし、アルミニウム箔(9μm)とPETフィルムとの積層品からなる導電層を準備して、そのアルミニウム箔側をゲルに貼付した。さらにその積層品の上に表面材層(片面粘着剤)を貼付した。そして、109cm2の四角形状に打ち抜いて試験用対極板を作製した。そして、この対極板の2枚を背中に貼付し、また、この対極板の1枚を予め毛を剃っておいた太もも内側に貼付した。そして電気メスを想定して、背中に貼付した対極板から1.5Aの電流を1分間通電し、太ももに貼付した対極板からその電流を回収した。その後、太もも内側に貼付した対極板を剥がし、その対極板を貼っていた皮膚表面温度をサーモグラフで撮影した。測定前にも同部位の皮膚温度をサーモグラフで撮影しておき、撮影された画像の最大皮膚発熱温度から、測定前の皮膚温度を引き、発熱温度とした。
表1~2の「AL接着性」において、導電層としてのアルミニウム箔と上記高含水粘着性ゲルとの接着性を測定した結果を示す。
より具体的な測定方法は次のとおりである。各試料(ハイドロゲルサンプル)を20~100mmの短冊状に切り出した後、ポリエチレンフィルムを剥がしてALフィルムに貼付した。2kgのローラーを1往復させて高含水粘着性ゲルとALフィルムとを密着し、2日間常温で静置した。その後、カバーフィルムを剥がし表出した高含水粘着性ゲル表面には裏打ち材を貼付した。一方、ALフィルム側の面は両面テープを用いてSUSに接着した。そして、裏打ち材のついた高含水粘着性ゲルの端部をALフィルムから剥がし、TENSILON(ORIENTEC社製)にセットし、300mm/分の速度で90°方向に剥離させた際の剥離力をALとゲルの接着力とした。
12 表面材
12a 舌片部
13 導電層
14 高含水粘着性ゲル
15 カバーフィルム
Claims (11)
- 重合性単量体と架橋性単量体との共重合体からなる高分子マトリックス、水、多価アルコール、電解質、ポリアクリル酸、及びポリビニルアルコール、を含むハイドロゲルであって、
該ハイドロゲル全100重量%中、水を40~70重量%、ポリアクリル酸を1.0~5.0重量%、ポリビニルアルコールを0.5~5.0重量%含む高含水粘着性ゲル。 - 高分子マトリックスは、重合性単量体の一部として両親媒性単量体を、ハイドロゲル全100重量%中、0.5~5.0重量%含んで共重合したものである請求項1記載の高含水粘着性ゲル。
- 両親媒性単量体がN,N-ジメチル(メタ)アクリルアミドである請求項2記載の高含水粘着性ゲル。
- 水を45~65重量%含む請求項1~3のいずれかに記載の高含水粘着性ゲル。
- 電解質が硫酸ナトリウムを含む請求項1~4のいずれかに記載の高含水粘着性ゲル。
- 厚さ1mm、長さ100mm、幅20mmに切り出した前記ハイドロゲルをベークライト板に対して貼り付けて、300mm/分の速度で長さ方向に対して90°方向に剥離させた際の剥離力が1.5N/20mm以上である請求項1~5のいずれかに記載の高含水粘着性ゲル。
- 共重合して高分子マトリックスとなる重合性単量体と架橋性単量体、水、多価アルコール、電解質、ポリアクリル酸、及びポリビニルアルコール、を含むハイドロゲル製造用組成物であって、
該ハイドロゲル製造用組成物100重量%中、水を40~70重量%、ポリアクリル酸を1.0~5.0重量%、ポリビニルアルコールを0.5~5.0重量%含む高含水粘着性ゲル製造用組成物。 - ハイドロゲル製造用組成物100重量%中、重合性単量体の一部として両親媒性単量体を0.5~5.0重量%含む請求項7記載の高含水粘着性ゲル製造用組成物。
- 重合性単量体、架橋性単量体、両親媒性単量体、水、多価アルコール、電解質、ポリアクリル酸、ポリビニルアルコール、及び光重合開始剤を混合して、高含水粘着性ゲル製造用組成物を作製する工程1と、
該高含水粘着性ゲル製造用組成物中の単量体成分を重合架橋反応させる工程2とを含み、
前記高含水粘着性ゲル製造用組成物100重量%中、前記水の含有量が40~70重量%、前記ポリアクリル酸の含有量が1.0~5.0重量%、前記ポリビニルアルコールの含有量が0.5~5.0重量%、前記両親媒性単量体の含有量が0.5~5.0重量%である、
高含水粘着性ゲルの製造方法。 - 両親媒性単量体がN,N-ジメチル(メタ)アクリルアミドである請求項9記載の高含水粘着性ゲルの製造方法。
- 高周波電流を生体に流すための電極として用いられる電極パッドであって、
表面材と、その表面材上に積層する導電層と、その導電層を被覆する導電性粘着ゲル層とを有し、この導電性粘着ゲル層が請求項1~6のいずれかに記載の高含水粘着性ゲルである電極パッド。
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US15/124,878 US11162006B2 (en) | 2014-03-28 | 2015-03-20 | Water-rich adherent gel, composition for manufacturing water-rich adherent gel, and electrode pad |
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