Skin treatment device and conductive sheet

Abstract

[Problem] To provide a skin treatment device that is capable of applying, in response to a request of a user, skin treatment to a skin surface in a variety of areas. [Solution] According to one embodiment of the present invention, a skin treatment device is provided. This skin treatment device comprises: an electroconductive sheet at least part of which is stretchable in a given direction, or an electroconductive sheet at least part of which is flexible so as to be capable of following a skin surface; and a device body which is attached to the electroconductive sheet to supply electric current to the skin surface of a user. The electroconductive sheet has a sheet base material, an electroconduction pattern, and a bioadhesive layer. The electroconduction pattern is provided to one surface side of the sheet base material, and comprises a wiring part and an electrode part that is connected to one end side of the wiring part. The bioadhesive layer is provided to a side of the electroconduction pattern opposite to the sheet base material, and is configured so as to be adhered to the skin surface of the user.

Description

[Technical Field]

[0001] This invention relates to a skin treatment device and a conductive sheet. [Background technology]

[0002] Devices aimed at enhancing the cosmetic effects on the face have been developed over time (see Patent Document 1). As such a device, Patent Document 1 discloses a beauty mask that is worn on the user's face and performs treatment using electrical stimulation. This beauty mask comprises a mask body that covers almost the entire face of the user, and a stimulator provided on the mask body that applies a treatment wave to the area corresponding to the user's cheeks, which has a predetermined current intensity. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-116856 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] However, the aforementioned beauty mask has a problem in that the treatment area is limited to the user's cheeks. In view of the above circumstances, the present invention provides a skin treatment apparatus capable of performing skin treatment on various areas of the skin surface according to the user's requirements. [Means for solving the problem]

[0005] According to one aspect of the present invention, a skin treatment device is provided. This skin treatment device comprises a conductive sheet, at least a portion of which is stretchable in any direction, or a conductive sheet, at least a portion of which is flexible enough to conform to the skin surface, and a device body attached to the conductive sheet and supplying electric current to the user's skin surface. The conductive sheet has a sheet substrate, a conductive pattern, and a bio-adhesive layer. The conductive pattern is provided on one side of the sheet substrate and includes a wiring portion and an electrode portion connected to one end of the wiring portion. The bio-adhesive layer is provided on the side of the conductive pattern opposite to the sheet substrate and is configured to adhere to the user's skin surface.

[0006] According to this embodiment, a skin treatment apparatus can be provided that can perform skin treatment on various areas of skin surface according to the user's requirements. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a plan view showing the skin treatment device according to this embodiment in an disassembled state. [Figure 2] Figure 2 is a plan view showing the device body from Figure 1 inverted (front and back). [Figure 3] Figure 3 is a plan view showing the conductive sheet of the first configuration example in an disassembled state. [Figure 4] Figure 4 is a cross-sectional view along line AA in Figure 1. [Figure 5] Figure 5 is a block diagram showing the configuration of the main body of the device. [Figure 6] Figure 6 is a plan view showing a conductive sheet with a bio-adhesive layer of a different configuration in its disassembled state. [Figure 7] Figure 7 is a cross-sectional view of the conductive sheet in Figure 6, corresponding to Figure 4. [Figure 8] Figure 8 is a plan view showing the skin treatment device equipped with a conductive sheet according to the second configuration example in an disassembled state. [Figure 9] Figure 9 is a plan view showing the conductive sheet of the third configuration example. [Figure 10] Figure 10 is a plan view showing the conductive sheet of the fourth configuration example. [Figure 11] FIG. 11 is a bottom view showing the conductive sheet of the fifth configuration example. [Figure 12] FIG. 12(a) is a plan view showing the conductive sheet 1 of the sixth configuration example, and FIG. 12(b) is a side view showing the conductive sheet 1 of the sixth configuration example. [Figure 13] . FIG. 13 is a cross-sectional view taken along line B-B in FIG. 12(a).

Mode for Carrying Out the Invention

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Various features shown in the embodiments described below can be combined with each other.

[0009] By the way, the program for realizing the software that appears in this embodiment may be provided as a non-temporary computer-readable medium (Non-Transitory Computer-Readable Medium) readable by a computer, may be provided so as to be downloadable from an external server, or may be provided so that the program is started on an external computer and its function is realized on a client terminal (so-called cloud computing).

[0010] In addition, in this embodiment, the "part" may include, for example, hardware resources implemented by a circuit in a broad sense and information processing of software that can be specifically realized by these hardware resources. Also, in this embodiment, various information is handled, and these information are represented, for example, by physical values of signal values representing voltage and current, the high and low of signal values as a set of binary bits composed of 0 or 1, or quantum superposition (so-called quantum bits), and communication and calculation can be executed on a circuit in a broad sense.

[0011] In addition, a circuit in a broad sense is a circuit realized by appropriately combining at least a circuit, circuitry, a processor, a memory, etc. That is, it includes an application specific integrated circuit (ASIC), a programmable logic device (e.g., a simple programmable logic device (SPLD), a complex programmable logic device (CPLD), and a field programmable gate array (FPGA)), etc.

[0012] First, the skin treatment device of the present invention will be described. FIG. 1 is a plan view showing the skin treatment device according to the present embodiment in a disassembled state. FIG. 2 is a plan view showing the state where the device main body in FIG. 1 is turned inside out. FIG. 3 is a plan view showing the conductive sheet of the first configuration example in a disassembled state. FIG. 4 is a cross-sectional view taken along line A-A in FIG. 1. FIG. 5 is a block diagram showing the configuration of the device main body. In the following description, the front side of the paper in FIGS. 1 to 3 is also described as "front" or "upper", the back side of the paper in FIGS. 1 to 3 is also described as "back" or "lower", the upper side in FIG. 4 is also described as "front" or "upper", and the lower side in FIG. 4 is also described as "back" or "lower". The skin treatment device 100 shown in FIGS. 1 and 2 is used by being attached to the skin surface of a user. This skin treatment device 100 includes a conductive sheet 1 at least partially stretchable in an arbitrary direction, and a device main body 10 attached to the conductive sheet 1 for supplying an electric current to the skin surface of the user.

[0013] <First Configuration Example> First, the first configuration example of the conductive sheet 1 will be described. As shown in Figures 3 and 4, the conductive sheet 1 comprises a sheet substrate 2, a conductive pattern 3, and a bio-adhesive layer 4. In Figures 1 and 2, the conductive pattern 3 located on the back (bottom) side of the sheet substrate 2 is shown with diagonal lines. As shown in Figures 1 and 3, the sheet substrate 2 has a pair of rounded wide sections 21 and narrow sections 22 connecting these wide sections 21, and these are integrally formed. With this configuration, the sheet substrate 2 has a dumbbell shape when viewed from above. Furthermore, an ear portion 23 is formed to protrude from the end of the wider portion 21 opposite to the narrower portion 22. By grasping and manipulating this ear portion 23 with a finger or the like, the skin treatment device 100 can be smoothly peeled off (removed) from the user's skin surface.

[0014] The sheet substrate 2 functions as a support layer that supports the conductive pattern 3 and the bio-adhesive layer 4. This sheet substrate 2 is stretchable in any direction. Examples of sheet substrate 2 include resin sheets such as polyethylene terephthalate sheets, polypropylene sheets, and polyethylene sheets; thermoplastic elastomer sheets such as urethane-based thermoplastic elastomer sheets; rubber sheets such as nitrile rubber sheets and urethane rubber sheets; paper substrates; woven fabrics; nonwoven fabrics; foam sheets; or laminated sheets made by laminating these materials. The thickness of the sheet substrate 2 is not particularly limited, but from the viewpoint of ensuring high conformability to the skin surface of the conductive sheet 1, it is preferably about 10 μm to 200 μm, and more preferably about 25 μm to 150 μm.

[0015] The durometer hardness A of the sheet substrate 2 is preferably between 10 and 80, and more preferably between 30 and 70. This improves the degree of deformation (bending, stretching, etc.) of the sheet substrate 2, as well as increasing its frictional durability and mechanical strength. The durometer hardness A of the sheet substrate 2 is obtained by preparing a sheet-like test specimen using the sheet substrate 2 in accordance with JIS K 6253 (1997), and measuring its durometer hardness A at 25°C.

[0016] The tear strength of the sheet substrate 2 is preferably between 25 N / mm and 80 N / mm, and more preferably between 30 N / mm and 70 N / mm. This improves the durability of the sheet substrate 2 during repeated use. It also makes the sheet substrate 2 less prone to damage even when made thin. Therefore, it is possible to increase the degree of design freedom while balancing the various properties of the sheet substrate 2. The tear strength of the sheet substrate 2 is obtained by preparing a crescent-shaped test specimen using the sheet substrate 2 in accordance with JIS K6252 (2001), and measuring its tear strength at 25°C.

[0017] The elongation at break of the sheet substrate 2 is preferably between 100% and 2000%, more preferably between 200% and 1900%, and even more preferably between 300% and 1800%. This allows for a balance of the various properties of the sheet substrate 2 while improving its high elasticity and durability. The elongation at break of the sheet substrate 2 can be calculated by preparing a dumbbell-shaped No. 3 test specimen using the sheet substrate 2 in accordance with JIS K 6251 (2004), measuring its elongation at break at 25°C, and then calculating it using the formula: [gauge displacement (mm)] ÷ [initial gauge distance (20 mm)] × 100.

[0018] The tensile strength of the sheet substrate 2 is preferably between 5 MPa and 25 MPa, and more preferably between 10 MPa and 20 MPa. This allows for a balance of the various properties of the sheet substrate 2 while improving its mechanical strength. Furthermore, it enables the realization of a sheet substrate 2 with excellent durability that can withstand repeated deformation. The tensile strength of the sheet substrate 2 is obtained by preparing a dumbbell-shaped test specimen of type 3 using the sheet substrate 2 in accordance with JIS K 6251 (2004), and measuring its tensile strength at 25°C.

[0019] The sheet substrate 2 preferably has high gas permeability (high oxygen permeability, high water vapor permeability). This makes it less likely to damage the skin surface when the skin treatment device 100 is used to treat the skin surface. Specifically, the oxygen permeability of the sheet substrate 2 is not particularly limited, but is 1 × 10 3 cm 3 / m 2 It is preferable that the current is 24 hours at an average of 10°C or more. 3 cm 3 / m 2 It is preferable that the ATM is open 24 hours or more. Furthermore, the water vapor permeability of the sheet substrate 2 is not particularly limited, but is 5 g / m². 2 It is preferable that the humidity is 24h·atm or higher, or 10g / m². 2 It is preferable that the ATM is open 24 hours or more.

[0020] The sheet base material 2 (narrow portion 22) has two through holes 221 and two openings 222 formed therein. The pins 101 of the device body 10, as shown in Figure 2, are inserted through the two through holes 221. By inserting the pins 101 into the through holes 221, the device body 10 can be positioned relative to the conductive sheet 1. In other words, the skin treatment device 100 is equipped with a positioning section for the device body 10 relative to the conductive sheet 1, which is composed of the pins 101 and the through holes 221. A portion of the conductive pattern 3 is exposed at each opening 222. The device body 10 has a pair of terminal portions 11, as shown in Figure 2. When the device body 10 is positioned relative to the conductive sheet 1, the terminal portions 11 are inserted into the corresponding openings 222 and come into contact with the conductive pattern 3. This electrically connects the device body 10 and the conductive pattern 3.

[0021] The conductive pattern 3 is provided on the lower side (one side) of the sheet substrate 2. This conductive pattern 3 may be in direct contact with the sheet substrate 2, or it may be provided via an intermediate layer of any desired purpose. The functions of the intermediate layer include, for example, improving the adhesion between the conductive pattern 3 and the sheet substrate 2, reinforcing the conductive pattern 3, and functions other than electrical conductivity (for example, heating function, magnetic force application function, etc., which will be described later). As shown in Figure 3, the conductive patterns 3 are provided in pairs, one on the left and one on the right, and the two conductive patterns 3 have substantially the same shape. Each conductive pattern 3 includes three wiring sections 31 and an electrode section 32 connected to one end of each wiring section 31. By dividing and arranging the electrode sections 32 in this way, it becomes easier to supply current more uniformly to the skin surface.

[0022] Furthermore, the three wiring sections 31 merge at the other end to form a merging section 33. A connecting portion 34 is integrally formed from the junction portion 33, protruding to the other end. As described above, the sheet substrate 2 has an opening 222 that exposes this connecting portion 34. Then, when the device body 10 is attached to the conductive sheet 1, the terminal portion 11 is inserted into the corresponding opening 222 and makes contact with the connection portion 34. That is, the wiring portion 31 has a connection portion 34 on the other end that is connected to one of the terminal portions 11. This conductive pattern 3 can also be stretched or contracted in any direction.

[0023] The conductive pattern 3 can be composed of, for example, a composite material (stretchable conductive material) containing a conductive filler and an elastomer. Examples of conductive fillers include carbon materials such as carbon nanotubes and carbon nanohorns, and metallic materials such as gold, silver, copper, and nickel. Examples of elastomers include thermoplastic elastomers such as polyamide-based thermoplastic elastomers, polyester-based thermoplastic elastomers, and urethane-based thermoplastic elastomers, as well as rubber materials such as ethylene propylene rubber, neoprene rubber, natural rubber, and silicone rubber. For such a composite material, the conductive pattern 3 can be relatively easily produced using a printing method.

[0024] The thickness of the conductive pattern 3 is not particularly limited, but from the viewpoint of ensuring high followability to the skin surface of the conductive sheet 1 and the mechanical strength of the conductive pattern 3, it is preferably about 1 μm or more and 50 μm or less, and more preferably about 5 μm or more and 25 μm or less. When the resistance value (25 °C) of the entire conductive pattern 3 and the bioadhesive layer 4, or the conductive pattern 3 alone in the non-stretched state (natural state) is R1 [Ω], and the resistance value (25 °C) of the entire conductive pattern 3 and the bioadhesive layer 4, or the conductive pattern 3 alone at 50% elongation is R2 (Ω), it is preferable to satisfy the relationship of 1 < R2 / R1 ≤ 20, more preferably to satisfy the relationship of R2 / R1 ≤ 18, and even more preferably to satisfy the relationship of R2 / R1 ≤ 16. With such a variation in the resistance value, current can be stably supplied to the skin surface. When R1 is measured as the resistance value between the lower surface (skin side surface) of the bioadhesive layer 4, or when the bioadhesive layer 3 is omitted, the lower surface (skin side surface) of the conductive pattern 3 and the upper surface (connection of the power supply) of the connection portion 34, it is preferably about 1000 Ω or less, more preferably about 600 Ω or less, even more preferably about 500 Ω or less, particularly preferably about 400 Ω or less, and most preferably about 300 Ω or less. R2 is preferably about 5000 Ω or less, more preferably about 2000 Ω or less, and even more preferably about 1500 Ω or less.

[0025] In this specification, the stretchability of the conductive pattern 3 is represented by the elongation rate when the conductive pattern 3 is stretched in a certain direction. The certain direction can be, for example, the extending direction in which the wiring portion 31 extends. When the conductive pattern 3 is stretched in this extending direction, the elongation rate is preferably about 10% or more, more preferably about 20% or more, and even more preferably about 50% or more, and when stretched at that elongation rate, no breaks occur in the conductive pattern 3. A conductive pattern 3 that satisfies these conditions can be determined to be elastic. Furthermore, as shown in Figures 1 and 2, parts of the wiring section 31 and electrode section 32 are arranged along the outer edge of the sheet substrate 2. This allows for a more uniform supply of current to the skin surface area to which the conductive sheet 1 is attached.

[0026] The bio-adhesive layer 4 is provided on the side opposite to the sheet substrate 2 of the conductive pattern 3. This bio-adhesive layer 4 is configured to adhere to the user's skin surface. In other words, the bio-adhesive layer 4 has the function of holding the entire skin treatment device 100 to the user's skin surface. The adhesive strength of the bio-adhesive layer 4 varies slightly depending on the shape and size of the conductive pattern 3, but is preferably around 0.5 N / 20 mm to 10 N / 20 mm, and more preferably around 1 N / 20 mm to 6 N / 20 mm. If the bio-adhesive layer 4 has an adhesive strength within this range, the conductive pattern 3 can be more reliably held to the user's skin. The adhesive strength of the bio-adhesive layer 4 refers to the adhesive strength when peeled off at a 90° angle, according to the adhesive tape test method of JIS Z 0237:2009.

[0027] As shown in Figure 3, the bio-adhesive layers 4 are provided in pairs, one on the left and one on the right, and the two bio-adhesive layers 4 have substantially the same shape. Each bio-adhesive layer 4 is sized to encompass the conductive pattern 3 in a plan view. By covering the entire conductive pattern 3 with the bio-adhesive layers 4 in this way, it becomes easier to supply current more uniformly to the skin surface. The bio-adhesive layer 4 can be obtained by supplying the bio-adhesive layer-forming material before gelation onto a release sheet to form a coating film and then crosslinking it. Alternatively, the bio-adhesive layer-forming material before gelation may be supplied so as to cover the conductive pattern 3 and then crosslinked to obtain the layer 4. Methods for crosslinking (polymerization) include, for example, heating, light irradiation, or radiation irradiation of the material for forming the bio-adhesive layer.

[0028] This bio-adhesive layer 4 can also be stretched and contracted in any direction. The bio-adhesive layer 4 is preferably a gel that has adhesive properties to the skin surface, and is particularly preferably a high-water-content adhesive gel. In other words, the bio-adhesive layer 4 is preferably in a gel-like state. The water content of the high-water-content adhesive gel is not particularly limited, but is preferably 10% by mass or more and 60% by mass or less, and more preferably 15% by mass or more and 50% by weight or less. By having an appropriate water content in the bio-adhesive layer 4, swelling of the bio-adhesive layer 4 is suppressed when used in combination with topical skin preparations, and a decrease in the adhesion force of the conductive pattern 3 can be prevented or suppressed. The high-water-content adhesive gel is preferably a hydrogel containing, in addition to water, a polymer matrix and a plasticizer, and optionally an electrolyte and a water-soluble polymer. The high-water-content adhesive gel may also contain active ingredients found in topical skin preparations, as described later. In this case, multiple fine needle-shaped protrusions (height: approximately 50 μm to 150 μm) may be formed on the skin-facing side of the bio-adhesive layer 4. This allows the multiple protrusions to penetrate the skin surface when the bio-adhesive layer 4 is applied to the skin, thereby promoting the penetration of the active ingredients into the skin tissue.

[0029] (Polymer matrix) The polymer matrix is ​​not particularly limited as long as it is composed of polymer compounds that can form a network structure and, by containing at least water, can form a gel. In the present invention, polymer compounds that can be adhered to the skin surface are preferably used. Such polymer compounds are particularly preferably copolymers of a monofunctional monomer having one ethylenically unsaturated group and a crosslinkable monomer. Examples of monofunctional monomers include (meth)acrylamide monomers, (meth)acrylic acid ester monomers, and monomers such as (meth)acrylic acid or its salts. These monofunctional monomers may be used individually or in combination of two or more.

[0030] Specific examples of (meth)acrylamide monomers include, for example, N,N-dialkyl(meth)acrylamides such as (meth)acrylamide, N,N-dimethyl(meth)acrylamide, and N,N-diethyl(meth)acrylamide; N-alkyl(meth)acrylamides such as N-isopropyl(meth)acrylamide, N-methyl(meth)acrylamide, N-ethyl(meth)acrylamide, and N-propyl(meth)acrylamide; N-hydroxyalkyl(meth)acrylamides such as N-hydroxyethyl(meth)acrylamide and N-hydroxymethyl(meth)acrylamide; amino group-containing cationic monomers such as dimethylaminopropyl(meth)acrylamide; sulfonic acid group-containing anionic monomers such as tert-butylacrylamidesulfonic acid or their salts; and derivatives thereof.

[0031] Specific examples of (meth)acrylic acid ester monomers include alkyl (meth)acrylic acid esters having an alkyl group with 1 to 18 carbon atoms, such as methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, and tert-butyl (meth)acrylate; alkoxy group-containing (meth)acrylic acid esters such as 2-methoxyethyl (meth)acrylate, ethoxyethoxyethyl (meth)acrylate, and methoxytriethylene glycol (meth)acrylate; hydroxyalkyl (meth)acrylic acid esters such as 2-hydroxyethyl (meth)acrylate and 2-hydroxypropyl (meth)acrylate; glycerin mono(meth)acrylate; polyalkylene glycol mono(meth)acrylate such as polyethylene glycol mono(meth)acrylate; and (meth)acrylic acid esters having an aromatic ring, such as benzyl (meth)acrylate.

[0032] Specific examples of (meth)acrylic acid or its salts include, for example, acrylic acid, methacrylic acid, sodium acrylate, potassium acrylate, potassium methacrylate, etc. In a hydrogel, the total content of structural units derived from monofunctional monomers is preferably 10% to 50% by mass, and more preferably 15% to 45% by mass, relative to the total mass of the hydrogel. By setting the total content of structural units derived from monofunctional monomers in the hydrogel within the above range, it is possible to improve the flexibility of the hydrogel while maintaining sufficient shape retention.

[0033] Examples of crosslinkable monomers include compounds having two or more polymerizable carbon-carbon double bonds within the molecule. Specific examples of such compounds include divinylbenzene, divinylbiphenyl, N,N'-methylenebis(meth)acrylamide, ethylene glycol di(meth)acrylate, glycerin tri(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, and polyglycerin di(meth)acrylate. These crosslinkable monomers may be used individually or in combination of two or more.

[0034] In hydrogels, the content of structural units derived from crosslinkable monomers is not particularly limited, as it varies slightly depending on the type of monofunctional monomer and crosslinkable monomer used. However, it is preferably about 0.01% to 0.5% by mass, and more preferably about 0.01% to 0.1% by mass, relative to the total mass of the hydrogel. By setting the content of structural units derived from crosslinkable monomers in the hydrogel within the above range, the crosslinking density can be sufficiently increased to maintain the shape stability of the gel while preventing or suppressing the gel from becoming too hard.

[0035] (Plasticizer) Plasticizers are components added to hydrogels to impart water retention (moisture retention) and suppress water evaporation, thereby maintaining the flexibility of the gel. Polyoxyalkylene alkyl ethers and / or sugars are preferably used as such plasticizers. Because these compounds are more hydrophobic than polyhydric alcohols, they can reduce the penetration of water into the hydrogel from the outside, thereby preventing or suppressing gel swelling. Specific examples of polyoxyalkylene alkyl ethers include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, and polyoxyethylene isostearyl ether, and polyoxypropylene alkyl ethers such as polyoxypropylene lauryl ether, polyoxypropylene stearyl ether, and polyoxypropylene isostearyl ether.

[0036] Sugars are classified into monosaccharides, disaccharides, or polysaccharides, and one of these may be used alone or two or more may be used in combination. Examples of monosaccharides include xylose, arabinose, glucose, galactose, and mannose. Examples of disaccharides include sucrose, maltose, cellobiose, and lactose. Examples of polysaccharides include oligosaccharides such as maltotriose, xylan, starch, cellulose, chitin, and chitosan. Furthermore, amino sugars of these sugars and their N-acetylated derivatives can also be used.

[0037] The plasticizer content is preferably 10% to 60% by mass, and more preferably 20% to 50% by mass, relative to the total mass of the hydrogel. By setting the plasticizer content in the hydrogel within the above range, it is possible to prevent the plasticizer from bleeding out onto the gel surface, stabilize the gel over a long period of time, and maintain the gel's adhesive strength. Furthermore, the ratio of the polymer matrix to the plasticizer is preferably about 0.25:1 to 3:1 by mass, and more preferably about 0.45:1 to 2.5:1 by mass.

[0038] (electrolyte) Electrolytes are components added to hydrogels for purposes such as imparting conductivity. Examples of electrolytes include inorganic salts, organic salts, polymer salts, or mixtures thereof. Specific examples of inorganic salts include alkali metal halides, alkaline earth metal halides, other metal halides, hypochlorites, chlorites, chlorates, perchlorates, sulfates, carbonates, nitrates, phosphates, ammonium salts, and complex salts. Specific examples of organic salts include metal salts of carboxylic acids such as acetic acid, benzoic acid, lactic acid, tartaric acid, phthalic acid, succinic acid, adipic acid, and citric acid, metal salts of sulfonic acids, metal salts of amino acids, and organic ammonium salts. Specific examples of polymer salts include salts of poly(meth)acrylic acid, polyvinyl sulfonic acid, polyter-butylacrylamide sulfonic acid, polyallylamine, and polyethyleneimine.

[0039] The electrolyte content is preferably 0.001% to 10% by mass, and more preferably 0.1% to 5% by mass, relative to the total mass of the hydrogel. By setting the electrolyte content in the hydrogel within the above range, it is possible to prevent an increase in the impedance (Z) of the hydrogel and impart sufficient conductivity to the hydrogel. Electrolytes may be added for purposes such as adjusting the pH of the hydrogel, improving the moisturizing properties of the hydrogel, or imparting antibacterial properties to the hydrogel.

[0040] (Water-soluble polymer) Water-soluble polymers are components added to hydrogels for purposes such as imparting tackiness. Examples of water-soluble polymers include polyvinylpyrrolidone, vinylpyrrolidone copolymer, polyvinyl alcohol, polyacrylic acid, sodium polyacrylate, sodium carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, sodium alginate, and dextran. These water-soluble polymers may be used individually or in combination of two or more. Among these, polyacrylic acid and / or sodium polyacrylate are preferred as water-soluble polymers because they are excellent at imparting tackiness to hydrogels. The water-soluble polymer content is preferably 0.1% to 5% by mass relative to the total mass of the hydrogel.

[0041] (Other additives) Other ingredients such as preservatives, disinfectants, rust inhibitors, antioxidants, stabilizers, fragrances, surfactants, colorants, anti-inflammatory agents, vitamins, and whitening agents may be added to the hydrogel as needed, within limits that do not impair the effects of the present invention. These additives may be used individually or in combination of two or more. Furthermore, it is preferable that the content of these additives be approximately 0.01% by mass or more and 10% by mass or less, relative to the total mass of the hydrogel.

[0042] Such hydrogels can be prepared, for example, as follows: When the polymer matrix is ​​composed of a polymer of monofunctional monomers and crosslinkable monomers, it can be easily prepared by copolymerizing the monofunctional monomers and crosslinkable monomers in a compound solution obtained by uniformly mixing and dissolving the monofunctional monomers, crosslinkable monomers, and plasticizers in water. The compounding solution may contain water-soluble polymers, electrolytes, and / or other additives as needed. Alternatively, it can be produced by impregnating a polymer matrix, which has been formed by polymerizing monofunctional monomers and crosslinkable monomers in advance, with water and plasticizers, and optionally water-soluble polymers, electrolytes and / or other additives.

[0043] Polymerization of monofunctional monomers and crosslinkable monomers is preferably carried out in the presence of a polymerization initiator. Examples of polymerization initiators that can be used include thermal polymerization initiators and photopolymerization initiators. Compounds that cleave upon heat and generate radicals can be used as thermal polymerization initiators. Examples of such thermal polymerization initiators include benzoyl peroxide, azobiscyanovaleric acid, azobisisobutyronitrile, azobisamidinopropane dihydrochloride, potassium persulfate, and ammonium persulfate. These thermal polymerization initiators may be used individually or in combination of two or more. If necessary, a redox initiator consisting of a reducing agent such as ferrous sulfate or pyrosulfite and a peroxide such as hydrogen peroxide, sodium thiosulfate, or peroxodisulfate may be used in combination with the thermal polymerization initiator.

[0044] As photopolymerization initiators, compounds that cleave under ultraviolet or visible light to generate radicals can be used. Examples of such photopolymerization initiators include azo polymerization initiators such as 2,2'-azobis-N-(2-hydroxyethyl)propionamide and 2,2'-azobis(1-imino-1-pyrrolidino-2-methylpropane)dihydrochloride, as well as α-hydroxyketones, α-aminoketones, benzyl methyl ketals, bisacylphosphine oxides, and metallocenes. Specific examples of photopolymerization initiators include 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-propan-1-one, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone, 2-methyl-1-[(methylthio)phenyl]-2-morpholinopropan-1-one, and 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butan-1-one. These photopolymerization initiators may be used individually or in combination of two or more.

[0045] The polymerization initiator content is preferably 0.01% to 1% by mass, and more preferably 0.05% to 0.5% by mass, relative to the total mass of the hydrogel (total mass of the material for forming the bioadhesive layer). By setting the polymerization initiator content in the hydrogel within the above range, the polymerization reaction proceeds sufficiently, and the amount of monofunctional monomers and crosslinkable monomers remaining in the resulting hydrogel can be reduced. Furthermore, discoloration (yellowing) and odor caused by the polymerization initiator remaining in the resulting hydrogel can be prevented. The thickness of the bio-adhesive layer 4 is not particularly limited, but from the viewpoint of ensuring high conformability of the conductive sheet 1 to the skin surface and the mechanical strength of the bio-adhesive layer 4, it is preferably about 50 μm to 500 μm, and more preferably about 100 μm to 350 μm.

[0046] Furthermore, the bio-adhesive layer 4 is not limited to covering the entire conductive pattern 3, but can also cover only a portion of it. In the latter case, the conductive sheet 1 will adhere to the skin surface with the conductive pattern 3 in areas where the bio-adhesive layer 4 is absent, and with the bio-adhesive layer 4 in areas where it is present. In this case, the presence of the bio-adhesive layer 4 ensures that the conductive sheet 1 adheres securely to the user's skin surface, while providing stronger electric current stimulation to the skin surface where the conductive pattern 3 is in direct contact. Furthermore, the conductive sheet 1 only needs to be stretchable in any direction at least in part. Therefore, the conductive sheet 1 may be configured such that the sheet base material 2 is stretchable, but the conductive pattern 3 is not necessarily stretchable, or the sheet base material 2 and / or the conductive pattern 3 include both stretchable and non-stretchable parts, or the conductive sheet 1 as a whole may include both stretchable and non-stretchable parts. Furthermore, the conductive sheet 1 may not be stretchable, but at least a portion of it may be flexible enough to conform to the skin surface. In this case, the range of materials that can be used for the sheet base material 2 and the conductive pattern 3 can be broadened.

[0047] The main body of the device 10 is attached to such a conductive sheet 1. In the first configuration example, the conductive sheet 1 is elongated, and the device body 10 is attached to the central part (narrow section 22) in the longitudinal direction of the conductive sheet 1. As described above, a pair of pins 101 and a pair of terminal portions 11 protrude from the back surface of the device body 10. The pair of pins 101 are each inserted into corresponding through holes 221 formed in the narrow portion 22 of the sheet substrate 2. The pair of terminal portions 11 are each inserted into corresponding openings 222 formed in the narrow portion 22 of the sheet substrate 2. In this way, the device body 10 is connected (fixed) to the conductive sheet 1.

[0048] With this configuration, in this embodiment, the device body 10 is detachably attached to the conductive sheet 1. Alternatively, the device body 10 may be permanently fixed to the conductive sheet 1. When the device body 10 is configured to be detachably attached to the conductive sheet 1, it is preferable that the device body 10 is attached to the conductive sheet 1 by magnetic force. For example, by placing a permanent magnet inside or on the back surface of the device body 10, this permanent magnet can be attracted to the conductive pattern 3 by magnetic force. Such an attachment / detachment mechanism has a simple configuration and also contributes to preventing the device body 10 from becoming too large. Furthermore, if the device body 10 is configured to be attracted to the conductive sheet 1 by magnetic force, it is possible to prevent the device body 10 from being attached to the conductive sheet 1 in the wrong direction by arranging permanent magnets with different polarities (south pole and north pole) on both the device body 10 and the conductive sheet 1, respectively. The device body 10 may be configured to be attached to the longitudinal end of the conductive sheet 1. In this case, the wiring portion 31 is extended to the end of the sheet substrate 2, and the connecting portion 34 is connected to its tip. This configuration can also be used for the conductive sheet 1 of other configurations described later and for the conductive sheet 1 of the second configuration example.

[0049] Furthermore, the device body 10 is desirable to be as small as possible and to have a mass that does not hinder close contact with the skin surface. For this reason, the device body 10 is made lighter and smaller by using a flexible substrate. Furthermore, in this case, it is preferable that the skin treatment device 100 is equipped with multiple conductive sheets 1 of different types, and that the device body 10 is detachably attached to each conductive sheet 1. This allows for the selection and use of a suitable conductive sheet 1 according to the area of ​​the skin to be treated, making it easier to perform skin treatment according to the user's requirements. A second example of the configuration of the conductive sheet 1 will be described later.

[0050] As shown in Figure 5, the surface of the device body 10 is provided with two operation buttons 12. These operation buttons 12 are capable of changing at least one of the power supply amount or power supply pattern (mode). Note that changing the power supply amount includes turning the power supply (power) on / off. Furthermore, the main body 10 of the device is equipped with a power supply unit 13, a control unit 14, and an electrical circuit unit 15. The power supply unit 13, the electrical circuit unit 15, and two operation buttons 12 are electrically connected to the control unit 14, and two terminal units 11 are electrically connected to the electrical circuit unit 15. The power supply unit 13 is configured to supply power to the electrode unit 32. For example, a dry cell battery, solar cell, fuel cell, lithium-ion secondary battery, solid-state battery, lithium polymer battery, etc., can be used for this power supply unit 13. The power supply unit 13 may also be a connector to which a power cable can be connected.

[0051] The control unit 14 incorporates an arithmetic element and a memory element. The computing elements consist of components such as a CPU (Central Processing Unit) and an MPU (Micro Processing Unit). The computing elements realize various functions related to the skin processing device 100 by reading predetermined programs stored in memory elements. In other words, information processing performed by software stored in memory elements is concretely realized by the computing elements. Furthermore, the computing element is not limited to a single element; multiple computing elements may be provided for each function. A combination of these is also acceptable.

[0052] The memory element stores various types of information as defined above. This can be done, for example, as a storage device such as a solid-state drive (SSD) that stores various programs related to the skin processing device 100 executed by the computing element, or as memory such as random-access memory (RAM) that stores temporarily necessary information (arguments, arrays, etc.) related to the calculations of the program. Furthermore, the memory element stores various programs and variables related to the skin processing device 100, which are executed by the arithmetic element.

[0053] The electrical circuit section 15 is composed of, for example, a drive circuit, an output waveform generation circuit, a transformer, a switching circuit, and the like. The control unit 14 is configured to control the power supplied from the power supply unit 13 to the electrode unit 32 via the electrical circuit unit 15. Here, power control means setting at least one of the following: voltage value, current value, waveform, frequency, pulse width, current direction, and current duration. In this embodiment, the current supplied by the main body 10 under the control of the control unit 14 is at least one of the following: a current that promotes the penetration of active ingredients contained in topical skin preparations, a current that provides muscle stimulation, a current that warms the skin surface, and a microcurrent. The type (mode) of current supplied by the main unit 10 can be changed by operating the operation button 12.

[0054] To promote the penetration of active ingredients in topical skin preparations, it is preferable to use a combination of currents having multiple types of pulse waveforms. This allows the active ingredients in topical skin preparations to penetrate the skin tissue more quickly. For example, the current having the first pulse waveform preferably has a frequency of about 1.5 kHz ± 10% and a voltage of about 20 V or less. In this case, it is more preferable to generate one pulse with reversed polarity for every multiple (e.g., 7) pulses of the same polarity. Furthermore, the current having the second pulse waveform preferably has a frequency of approximately 1 Hz to 1 kHz and a voltage of approximately 20 V to 50 V.

[0055] The order in which these two types of currents are supplied to the skin surface is arbitrary, but it is preferable that they be alternate. Furthermore, the combination of currents is not limited to this, and it is preferable to combine stimuli according to the purpose, the ingredients to be absorbed, and the user's preference for how it feels to promote the penetration of the active ingredients contained in the topical skin preparation. For example, a current having a third pulse waveform can also be used. In this case, the current preferably has a frequency of approximately 10 Hz to 100 Hz and a voltage of approximately 50 V or higher. By combining a current with a first pulse waveform and a current with a third pulse waveform, it is possible to use the device in a way that minimizes irritation, even when it is worn on the skin.

[0056] Furthermore, currents having multiple types of pulse waveforms may include currents with frequencies of approximately 10 Hz to 50 Hz (electromyographic stimulation), currents with a frequency of 1 kHz, and currents with multiple frequencies. Furthermore, the current used to promote the penetration of the active ingredient contained in topical skin preparations is not limited to the combined use of currents having multiple types of pulse waveforms; a current with a single waveform for iontophoresis may be used alone, or it may be used in combination with a current having at least one arbitrary pulse waveform.

[0057] The electrical current used to apply muscle stimulation (EMS) preferably has a frequency of approximately 1 Hz to 1 kHz. This allows for muscle contraction, muscle movement, and relaxation. The electric current used to heat the skin surface (high-frequency current) preferably has a frequency of approximately 10 kHz or higher, and more preferably between 10 kHz and 500 kHz. The microcurrent preferably has a frequency of approximately 1200 Hz or less.

[0058] The following compounds are examples of active ingredients contained in topical skin preparations used with the skin treatment device 100. Specific examples of active ingredients include, for example, tranexamic acid or its derivatives (such as tranexamic acid cetyl hydrochloride), niacinamide, pyridoxine hydrochloride or its derivatives, benzalkonium chloride, palmitoyl tripeptide-5, acetyl hexapeptide-8, dipeptide diaminobutyroyl benzylamide diacetate or its derivatives, allantoin, aldioxa, carnitine HCl, urea, and the like.

[0059] Other specific examples of active ingredients include, for example, potassium 4-methoxysalicylate, disodium adenosine monophosphate, ascorbic acid or its derivatives (L-ascorbic acid 2-glucoside, sodium L-ascorbyl phosphate, disodium L-ascorbic acid sulfate, trisodium ascorbyl palmitate phosphate, etc.), sodium dl-α-tocopheryl phosphate, zinc paraphenolsulfonate, salicylic acid and its sodium salts, sodium lactate, sodium L- or DL-pyrrolidone carboxylate, sodium L-glutamate, sodium L-aspartate, glycyrrhizic acid or its salts (dipotassium glycyrrhizinate, ammonium glycyrrhizinate, etc.), sodium guaiazulene sulfonate, sodium dilauroyl glutamate lysine, etc.

[0060] Other specific examples of active ingredients include, for example, kojic acid, arbutin, hydroquinone, 4-n-butylresorcinol, 5,5'-dipropyl-biphenyl-2,2'-diol, ellagic acid, ascorbic acid derivatives (3-O-ethyl ascorbic acid, 3-glyceryl ascorbic acid, bisglyceryl ascorbic acid, hexyl 3-glyceryl ascorbic acid, myristyl 3-glyceryl ascorbic acid, 3-laurylglyceryl ascorbic acid, etc.), D-pantothenyl alcohol, cholecalciferol, 3-o-cymen-5-ol (isopropylmethylphenol), glycine, proline, alanine, serine, acetylhydroxyproline, ε-aminocaproic acid, γ-aminobutyric acid, trimethylglycine, xylose, sorbitol, mannitol, butylene glycol, hexylene glycol, pentylene glycol, glycerin, hinokitiol, etc.

[0061] Other specific examples of active ingredients include, for example, fullerene, oryzanol, ceramide EOP, ceramide EOS, ceramide NG, caproyl sphingosine, ceramide NP, N-stearoyl phytosphingosine, N-stearoyl dihydrosphingosine, ceramide AG, ceramide AP, hydroxystearyl phytosphingosine, ceramide 6II, phytosphingosine (liposome-encapsulated or non-liposome-encapsulated), flavonoids (isoflavones, licorice root extract, licorice flavonoids, licorice flavonoids, etc.), extracts obtained from plants or animals (chamomile ET, Sophora flavescens root extract, Swertia japonica extract, carrot or its root extract, soybean extract, soybean seed extract, green tea leaf extract, Galactomyces ferment filtrate, rice extract No. 11, astaxanthin solution, red algae extract, placenta extract, etc.), stem cell culture medium, stem cell culture supernatant, etc.

[0062] Other specific examples of active ingredients include, for example, squalane, linoleic acid, ascorbyl tetra-2-hexyldecanoate, ascorbyl dipalmitate, retinol or its derivatives (retinyl acetate, retinyl palmitate, hydrogenated retinol, retinyl linoleate, etc.), tocopherol (natural vitamin E) or its derivatives (tocopherol nicotinate, dl-α-tocopherol, d-δ-tocopherol, DL-α-tocopherol acetate, etc.), and Examples include stearyl lycyrrhetinate, estradiol, ethinylestradiol, astaxanthin, rice germ oil, phospholipids (such as sphingomyelin), synthetic or plant-derived squalane, guaiazulene, guaiazulene sulfonate ester, fatty acid esters of ascorbic acid (such as ascorbyl stearate and ascorbyl palmitate), phytosteryl / octyldodecyl lauroyl glutamate, and oil-soluble placenta.

[0063] Other specific examples of active ingredients include, for example, human recombinant oligopeptide-1, palmitoyl hexapeptides (such as palmitoyl hexapeptide-4), palmitoyl pentapeptides, hydrolyzed collagen or its derivatives, hyaluronic acid or its derivatives (sodium hyaluronate, acetylated sodium hyaluronate), Tremella fuciformis polysaccharides, Alcaligenes-producing polysaccharides, polyquaterniums, and the like. The bio-adhesive layer 4 described above can effectively retain the compounds mentioned above.

[0064] Furthermore, the electric current used to promote the penetration of the active ingredients contained in topical skin preparations may be an alternating current. For example, depending on the characteristics of the active ingredients, an alternating current (alternating current stimulation) of a suitable frequency may be applied to the skin surface to promote the penetration of the active ingredients. When the active ingredient is a low-molecular-weight substance that is water-soluble and easily becomes positively charged in aqueous solution (such as tranexamic acid), the frequency of the alternating current is preferably between 10 kHz and 200 kHz, and more preferably between 50 kHz and 180 kHz. When the active ingredient is a low-molecular substance having properties of being water-soluble and easily negatively charged in an aqueous solution (such as potassium 4-methoxysalicylate), the frequency of the alternating current is preferably about 10 kHz or more and 200 kHz or less, and more preferably about 50 kHz or more and 160 kHz or less.

[0065] In addition, when the active ingredient is a low-molecular substance having properties of being water-soluble and hardly charged in an aqueous solution (such as kojic acid, arbutin, etc.) or an amphoteric electrolyte (amino acids, peptides), a lipid and an oil-soluble substance (such as squalane), a high-molecular substance (such as human gene recombinant oligopeptide-1), etc., it is also conceivable to promote the penetration of the active ingredient into the muscle tissue by applying an appropriate stimulus according to the properties of the active ingredient.

[0066] As shown in FIGS. 6 and 7, the bioadhesive layer 4 may be provided corresponding to the shape of the conductive pattern 3 in plan view. Specifically, the shape of the bioadhesive layer 4 in plan view may coincide with the shape of the conductive pattern 3 in plan view, or may be set slightly larger. FIG. 6 is a plan view showing a state in which a conductive sheet having a bioadhesive layer of another configuration is disassembled. FIG. 7 is a cross-sectional view corresponding to FIG. 4 of the conductive sheet of FIG. 6. In the following description, the front side of the paper surface in FIG. 6 is also described as "front" or "upper", the back side of the paper surface in FIG. 6 is also described as "back" or "lower", the upper side in FIG. 7 is also described as "front" or "upper", and the lower side in FIG. 7 is also described as "back" or "lower".

[0067] According to such a configuration, when using a topical skin preparation in combination, the topical skin preparation can be held in the slit 3a of the conductive pattern 3 and the slit 4a of the bioadhesive layer 4 to prevent or suppress scattering. In this state, if a current for promoting the penetration of the active ingredient contained in the topical skin preparation is supplied to the skin surface through the electrode portion 32, the penetration efficiency of the active ingredient can be further enhanced. The muscle treatment device 100 has an area A [mm 2 in plan view of the conductive sheet 1, and an area B [mm 2When this is the case, it is preferable that the B / A ratio is approximately 0.1 to 0.6, and more preferably approximately 0.2 to 0.5. This makes it possible to balance the size of the conductive sheet 1 with the size of the device body 10. Furthermore, the bio-adhesive layer 4 does not necessarily have to be provided in accordance with the shape of the conductive pattern 3 in a plan view. For example, it may have a shape and / or size that covers the entire conductive pattern 3, or it may have a shape and / or size that exposes a part of the conductive pattern 3.

[0068] <Example Configuration 2> Next, a second example of the conductive sheet 1 configuration will be described. The following explanation focuses on the differences between conductive sheet 1 in the second configuration example and conductive sheet 1 in the first configuration example described above, and similar matters will be omitted from the explanation. Figure 8 is a plan view showing the skin treatment device equipped with a conductive sheet according to the second configuration example in an disassembled state. In the following explanation, the front side of the paper in Figure 8 will be referred to as the "front" or "top," and the back side of the paper in Figure 8 will be referred to as the "back" or "bottom." Also, in Figure 8, the conductive pattern 3 located on the back (bottom) side of the sheet substrate 2 is indicated by diagonal lines.

[0069] In the second configuration example, the conductive sheet 1 is elongated, and its width at one end is greater than the width at the other end. The device body 10 is configured to be attached to one end of the conductive sheet 1. Furthermore, the conductive sheet 1 is curved in the middle of its longitudinal direction. The conductive sheet 1 having this configuration can be suitably used by being attached to the skin surface where wrinkles around the eyes or nasolabial folds are noticeable. In this way, a suitable conductive sheet 1 can be selected according to the area of ​​the skin to be treated, and the device body 10 can be attached and used, making it easier to perform skin treatment according to the user's requirements with greater reliability.

[0070] <Example 3 configuration> Next, a third configuration example of the conductive sheet 1 will be described. The following explanation focuses on the differences between the conductive sheet 1 of the third configuration example and the conductive sheet 1 of the first and second configuration examples described above, and similar matters will be omitted from the explanation. Figure 9 is a plan view showing the conductive sheet 1 of the third configuration example. In the following explanation, the front side of the paper in Figure 9 will be referred to as the "front" or "top," and the back side of the paper in Figure 9 will be referred to as the "back" or "bottom." Also, in Figure 9, the conductive pattern 3 located on the back (bottom) side of the sheet substrate 2 is indicated by diagonal lines.

[0071] The conductive sheet 1 in the third configuration example is elongated and curves along its longitudinal direction to form a C-shape or L-shape. The conductive sheet 1 with this configuration can be brought into contact with the areas of the frontalis muscle, temporalis muscle, and orbicularis oculi muscle all at once, making it easier to perform skin treatment on those areas. Furthermore, the tip 35 opposite the connection point 34 of each conductive pattern 3 is mesh-like. Having a tip 35 of this shape allows for the current applied to the skin surface to be dispersed in that area (in other words, it prevents the current from concentrating). As a result, the user can experience a mild sensation (muscle stimulation), that is, a sensation that is not unpleasant.

[0072] <Example 4> Next, we will describe a fourth configuration example of the conductive sheet 1. The following explanation focuses on the differences between conductive sheet 1 in the fourth configuration example and conductive sheet 1 in the first to third configuration examples described above, and similar matters will be omitted from the explanation. Figure 10 is a plan view showing the conductive sheet 1 of the fourth configuration example. In the following explanation, the front side of the paper in Figure 10 will be referred to as the "front" or "top," and the back side of the paper in Figure 10 will be referred to as the "back" or "bottom." Also, in Figure 10, the conductive pattern 3 located on the back (bottom) side of the sheet substrate 2 is indicated by diagonal lines.

[0073] The conductive sheet 1 in the fourth configuration example differs in the configuration of the leading edge of one of the conductive patterns 3, but is otherwise the same as the conductive sheet 1 in the third configuration example. In other words, in the conductive sheet 1 of the fourth configuration example, the tip portion 35a of one of the conductive patterns 3 is separated and independent. Therefore, current cannot be supplied to the tip portion 35a, and no current is supplied to the skin surface from the tip portion 35a. In this case, since the electrical current is not supplied across the frontal and temporal muscles, the occurrence of pain can be reduced.

[0074] <Example 5> Next, we will describe a fifth configuration example of the conductive sheet 1. The following explanation focuses on the differences between conductive sheet 1 in the fifth configuration example and conductive sheet 1 in the first to fourth configuration examples described above, and similar matters will be omitted from the explanation. Figure 11 is a bottom view showing the conductive sheet 1 of the fifth configuration example. In the following explanation, the front side of the paper in Figure 11 will be referred to as "back" or "bottom," and the back side of the paper in Figure 11 will be referred to as "front" or "top." Also, the bio-adhesive layer 4 is omitted in Figure 11. The conductive sheet 1 of the fifth configuration example includes a masking portion 5 provided to cover a part of the sheet substrate 2 (conductive pattern 3), and is otherwise the same as the conductive sheet 1 of the fourth configuration example.

[0075] This masking portion 5 has at least one of the following functions: interrupting the electric current supplied to the user's skin surface, and reducing the elasticity of the conductive sheet 1. For example, as shown in Figure 11, the masking portion 5 can be made of an insulating sheet provided to cover the area of ​​one of the conductive patterns 3 that is close to the connection portion 34. With this configuration, the current supplied to the skin surface from near the connection portion 34 is interrupted, and the current is preferentially supplied to the skin surface from the tip portion 35 side. In this way, by changing the area of ​​the conductive pattern 3 covered by the masking portion 5, the position in which a sensation (muscle stimulation) is easily obtained can be adjusted.

[0076] Furthermore, the masking portion 5 can also be made of a low-stretch sheet. In this case, the conductive sheet 1 may have an elastic portion that is stretched to adhere to the skin surface and a non-stretch portion that stably ensures the positional relationship between the skin surface and the conductive pattern 3. In this case, the stretchable portion can be the part that needs to conform to the shape of the face (for example, the part that corresponds to the skin surface where wrinkles are likely to form). On the other hand, the non-stretchable portion can be the part where you want to reliably apply muscle stimulation.

[0077] <Example 6> Next, we will describe the sixth configuration example of the conductive sheet 1. The following explanation focuses on the differences between conductive sheet 1 in the sixth configuration example and conductive sheet 1 in the first to fifth configuration examples described above, and similar matters will be omitted from the explanation. Figure 12(a) is a plan view showing the conductive sheet 1 of the sixth configuration example, and Figure 12(b) is a side view showing the conductive sheet 1 of the sixth configuration example. Figure 13 is a cross-sectional view taken along line BB in Figure 12(a). In the following explanation, the front side of the paper in Figure 12(a) will be referred to as "front" or "top," and the back side of the paper in Figure 12(a) will be referred to as "back" or "bottom." Similarly, the top side of Figure 12(b) will be referred to as "front" or "top," and the bottom side of Figure 12(b) will be referred to as "back" or "bottom." The top side of Figure 13 will also be referred to as "front" or "top," and the bottom side of Figure 13 will be referred to as "back" or "bottom." In addition, in Figure 12, the conductive pattern 3, etc., located on the back (bottom) side of the sheet substrate 2 is indicated by a dashed line.

[0078] As shown in Figure 13, the sheet substrate 2 of the sixth configuration example has a non-stretchable sheet substrate 201 and a stretchable sheet substrate 202, which are integrally formed. Alternatively, the sheet substrate 2 may be constructed by individually manufacturing the non-stretchable sheet substrate 201 and the stretchable sheet substrate 202, and then joining them together, for example, by adhesive bonding, fusion (heat fusion, high-frequency fusion, ultrasonic fusion), or adhesive members. For the adhesive members, for example, in addition to adhesive sheets 6 and conductive tape 37, additional adhesive tapes can be used. The non-stretchable sheet substrate 201 is preferably relatively rigid. The constituent material of such a non-stretchable sheet substrate 201 is not particularly limited, but examples include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polyphenylene sulfide (PPS), or fluororesin. Furthermore, the non-stretchable sheet substrate 201 has two through holes 2011 formed therein.

[0079] A reinforcing block 24 is fixed to the upper surface of the non-stretchable sheet substrate 201. The reinforcing block 24 has two through holes 241, each opening through an opening 222. Each through hole 241 communicates with each other through hole 2011. In addition, two through holes 221 are formed at predetermined positions on the reinforcing block 24. The device body 10 is mounted on this reinforcing block 24. The reinforcing block 24 can be made from the same materials as those listed for the non-stretchable sheet substrate 201. The stretchable sheet substrate 202 has high conformability to the skin surface and can adapt to skin movements, making it excellent for supporting the conductive pattern 3 as a skin electrode. The same materials as those listed for the sheet substrate 2 can be used for the constituent materials of the stretchable sheet substrate 202.

[0080] Two conductive patterns 3 are provided on the lower surface of the stretchable sheet substrate 202. Conductive tapes 37 are connected to each of the two conductive patterns 3 at electrical connection points 38. The conductive tape 37 can be made of a resin tape in which conductive particles containing silver, gold, nickel, etc. are dispersed. A columnar connecting portion 36 is fixed to the upper surface of each conductive tape 37. It is preferable that the connecting portion 36 is magnetic. An adhesive tape 6 is provided between each conductive tape 37 and the sheet substrate 2. Through holes 61 are formed in the adhesive tape 6. Examples of materials used for the adhesive tape 6 include acrylic adhesives, urethane adhesives, silicone adhesives, natural rubber adhesives, and synthetic rubber adhesives. These adhesives may be used individually or in combination of two or more.

[0081] In the assembled state of the conductive sheet 1, the connecting portion 36 is inserted into the through-hole 241 through the through-holes 61 and 2011. A masking tape 7 is provided on the underside of the conductive tape 37. The masking tape 7 can be made from the same materials as those listed for the non-stretchable sheet substrate 201. Furthermore, a bio-adhesive layer 4 is provided at the bottom of the conductive sheet 1. With this configuration, the connection portion 36 that electrically connects the terminal portion 11 of the device body 10 is reinforced with a non-stretchable sheet substrate 201, a reinforcing block 24, and masking tape 7, thus enabling a stable connection between the conductive sheet 1 and the device body 10. Furthermore, it is easy to remove the device body 10 from the conductive sheet 1. On the other hand, since the conductive pattern 3 is supported by the stretchable sheet substrate 202, it is attached to the skin surface with high conformability.

[0082] When conductive sheet 1 of the above configuration examples 2 to 6 was applied to the eye area three times a week for 10 minutes each time, after 4 weeks of use, the thickness of the orbicularis oculi muscle and temporalis muscle increased significantly, and after 8 weeks of use, a significant improvement in moisture content and sagging under the eyes was observed. At this stage of aging, age-related changes in the eyes often include sagging of the upper and lower eyelids, and wrinkles around the eyes. It is known that these age-related changes are influenced not only by physiological aging and photoaging due to age, but also by the muscles around the eyes, in addition to the skin. It has been reported that the orbicularis oculi muscle, which surrounds the eye in a donut shape, thins with age, and it is known that this drooping of the eyelids causes a loss of youthful appearance and changes that make one look older. It was found that by using a conductive sheet 1 that easily fits the eye area and efficiently applying electrical stimulation to the muscles around the eyes, the orbicularis oculi muscle and temporalis muscle are strengthened, resulting in a significant improvement in sagging around the eyes.

[0083] Next, the conductive sheet of the present invention will be described. The conductive sheet 1 is used to supply electric current to the user's skin and is at least partially stretchable in any direction, or at least partially flexible enough to conform to the skin surface. The conductive sheet 1 comprises a sheet base material 2, a conductive pattern 3, and a bio-adhesive layer 4. The conductive pattern 3 is provided on one side of the sheet base material 2 and includes a wiring portion 31 and an electrode portion 32 connected to one end of the wiring portion 31. The bio-adhesive layer 4 is provided on the side of the conductive pattern 3 opposite to the sheet base material 2 and is configured to adhere to the user's skin surface. Preferably, the bio-adhesive layer 4 is in a gel-like state. The configurations of the sheet substrate 2, conductive pattern 3, and bio-adhesive layer 4 are the same as those described in the skin treatment apparatus of the present invention. By using such conductive sheet 1, skin treatment can be performed on various areas of the skin surface according to the user's requirements. Furthermore, they may be provided in the following embodiments.

[0084] (1) A skin treatment device comprising: a conductive sheet, at least a portion of which is stretchable in any direction, or a conductive sheet, at least a portion of which is flexible enough to conform to the skin surface; and a device body attached to the conductive sheet and supplying an electric current to the user's skin surface, wherein the conductive sheet comprises a sheet substrate, a conductive pattern, and a bio-adhesive layer, the conductive pattern is provided on one side of the sheet substrate and comprises a wiring portion and an electrode portion connected to one end of the wiring portion, and the bio-adhesive layer is provided on the side of the conductive pattern opposite to the sheet substrate and is configured to adhere to the user's skin surface.

[0085] (2) A skin treatment apparatus as described in (1) above, wherein the bio-adhesive layer is in the form of a gel.

[0086] (3) A skin treatment apparatus according to (1) or (2) above, wherein the current is at least one of the following: a current that promotes the penetration of an active ingredient contained in a topical skin preparation, a current that provides muscle stimulation, a current that heats the skin surface, and a microcurrent.

[0087] (4) A skin treatment device according to any one of (1) to (3) above, wherein the main body of the device is detachably attached to the conductive sheet.

[0088] (5) A skin treatment device according to any one of (1) to (4) above, wherein the main body of the device is attached to the conductive sheet by magnetic force.

[0089] (6) A skin treatment apparatus according to (4) or (5) above, comprising a plurality of conductive sheets of different types, wherein the apparatus body is detachably attached to each of the conductive sheets.

[0090] (7) A skin treatment apparatus according to any one of (4) to (6) above, further comprising a positioning portion for the main body of the apparatus with respect to the conductive sheet.

[0091] (8) A skin treatment apparatus according to any one of (1) to (7) above, wherein the apparatus body further has a pair of terminals, and the wiring portion has a connecting portion on the other end that is connected to one of the terminals.

[0092] (9) A skin treatment apparatus as described in (8) above, wherein the sheet substrate has an opening that exposes the connecting portion.

[0093] (10) A skin treatment apparatus according to any one of (1) to (9) above, wherein a part of the wiring portion and the electrode portion are arranged along the outer edge of the sheet substrate.

[0094] (11) A skin treatment apparatus according to any one of (1) to (10) above, wherein the conductive sheet is elongated, and the apparatus body is attached to the central part or end of the conductive sheet in the longitudinal direction.

[0095] (12) A skin treatment apparatus according to any one of (1) to (10) above, wherein the conductive sheet is elongated and formed such that the width of one end is greater than the width of the other end, and the apparatus body is attached to the one end of the conductive sheet.

[0096] (13) A skin treatment apparatus according to (11) or (12) above, wherein the conductive sheet is curved in the middle of its longitudinal direction.

[0097] (14) A skin treatment apparatus as described in (13) above, wherein the conductive sheet is C-shaped or L-shaped.

[0098] (15) In the skin treatment apparatus described in any one of (1) to (14) above, the area of ​​the conductive sheet in plan view is A [mm 2 Let ] be the area of ​​the device body in plan view be B[mm 2 A skin treatment device in which, when ], the B / A ratio is between 0.1 and 0.6.

[0099] (16) A skin treatment apparatus according to any one of (1) to (15) above, wherein the bio-adhesive layer is provided in a manner corresponding to the shape of the conductive pattern in a plan view.

[0100] (17) A skin treatment apparatus according to any one of (1) to (16) above, wherein the resistance value of the entire conductive pattern and the bio-adhesive layer, or the conductive pattern alone, when not stretched is 1000 Ω or less.

[0101] (18) A skin treatment apparatus according to any one of (1) to (17) above, wherein the conductive sheet further comprises a masking portion provided to cover a part of the sheet substrate, and the masking portion has at least one of the functions of interrupting the current supplied to the user's skin surface and reducing the elasticity of the conductive sheet.

[0102] (19) A conductive sheet used to supply an electric current to the skin surface of a user, wherein at least a portion of the conductive sheet is stretchable in any direction, or at least a portion of the conductive sheet is flexible enough to conform to the skin surface, comprising a sheet substrate, a conductive pattern, and a bio-adhesive layer, wherein the conductive pattern is provided on one side of the sheet substrate and comprises a wiring portion and an electrode portion connected to one end of the wiring portion, and the bio-adhesive layer is provided on the side of the conductive pattern opposite to the sheet substrate and is configured to adhere to the skin surface of the user.

[0103] (20) A conductive sheet as described in (19) above, wherein the bio-adhesive layer is in the form of a gel. Of course, this is not always the case.

[0104] As previously described, various embodiments of the present invention have been explained, but these are merely examples and do not limit the scope of the invention in any way. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. In other words, the present invention is not limited to the above embodiments, and can be implemented in a suitable shape and processing method depending on the wrinkles on the skin surface, the shape of the skin surface at the application site, the skin condition, and the active ingredients used.

[0105] For example, a film heater may be placed between the sheet substrate 2 and the bio-adhesive layer 4. In this case, if a part of the conductive pattern 3 and a part of the film heater are electrically connected, current (power) can be supplied to the film heater. This allows the skin treatment device 100 to exert a warming effect on the skin surface due to the heating of the film heater when in use. Furthermore, a magnetic layer may be placed between the sheet substrate 2 and the bio-adhesive layer 4. In this case, if a part of the conductive pattern 3 and a part of the magnetic layer are electrically connected, an electric current (power) can be supplied to the magnetic layer. This allows the magnetic force of the magnetic layer to exert effects such as promoting blood circulation on the skin surface when the skin treatment device 100 is used. Such a magnetic layer can be created by printing magnetic ink or by pattern molding containing magnetic powder. Furthermore, a magnetic conductive pattern 3 may be formed by using a magnetic conductive filler.

[0106] Furthermore, the configurations of the conductive sheet 1 and the device body 10 are not limited to the above embodiments. For example, the device body 10 may be provided with multiple terminal sections (power contacts) 11 so that current (power) can be supplied from one device body 10 to multiple conductive sheets 1. [Explanation of Symbols]

[0107] 100: Skin treatment device, 1: Conductive sheet, 2: Sheet substrate, 201: Non-stretchable sheet substrate, 2011: Through hole, 202: Stretchable sheet substrate, 21: Wide section, 22: Narrow section, 221: Through hole, 222: Opening, 23: Ear section, 24: Reinforcement block, 241: Through hole, 3: Conductive pattern, 3a: Slit, 31: Wiring section, 32: Electrode section, 33: Junction section, 34: Connection section, 35: Tip section, 35a: Tip section, 36: Connection section, 37: Conductive tape, 38: Electrical connection section, 4: Bio-adhesive layer, 4a: Slit, 5: Masking section, 6: Adhesive tape, 61: Through hole, 7: Masking tape, 10: Device body, 101: Pin, 11: Terminal section, 12: Operation buttons, 13: Power supply unit, 14: Control unit, 15: Electrical circuit unit

Claims

1. A skin treatment device, The device comprises a conductive sheet, at least a portion of which is stretchable in any direction, or a conductive sheet, at least a portion of which is flexible enough to conform to the skin surface, and a device body attached to the conductive sheet that supplies electric current to the user's skin surface. The conductive sheet comprises a sheet substrate, a conductive pattern, a bio-adhesive layer, and a masking portion. The conductive pattern is provided on one side of the sheet substrate. The bio-adhesive layer is provided on the side of the conductive pattern opposite to the sheet substrate and is configured to adhere to the user's skin surface. The masking portion is provided so as to cover a part of the sheet substrate and has at least one of the following functions: interposing between the conductive pattern and the user's skin surface during use to interrupt the current supplied to the user's skin surface, and reducing the elasticity of the conductive sheet.

2. In the skin treatment apparatus according to claim 1, The aforementioned bio-adhesive layer is in the form of a gel, in a skin treatment device.

3. In the skin treatment apparatus according to claim 1, The current is at least one of the following: a current that promotes the penetration of active ingredients contained in a topical skin preparation; a current that provides muscle stimulation; a current that heats the skin surface; and a microcurrent, in a skin treatment device.

4. In the skin treatment apparatus according to claim 1, The device body is a skin treatment device that is detachably attached to the conductive sheet.

5. In the skin treatment apparatus according to claim 1, The aforementioned device body is a skin treatment device that is attached to the conductive sheet by magnetic force.

6. In the skin treatment apparatus according to claim 4, The conductive sheets are of different types, The device body is a skin treatment device that is detachably attached to each of the conductive sheets.

7. In the skin treatment apparatus according to claim 4, Furthermore, the skin treatment apparatus comprises a positioning unit for the main body of the apparatus relative to the conductive sheet.

8. In the skin treatment apparatus according to claim 1, The device body further has a pair of terminals, The conductive pattern comprises a wiring portion, an electrode portion connected to one end of the wiring portion, and a connecting portion connected to the other end of the wiring portion and connected to one of the terminal portions, in a skin treatment device.

9. In the skin treatment apparatus according to claim 8, The sheet substrate has an opening that exposes the connecting portion, and is a skin treatment device.

10. In the skin treatment apparatus according to claim 8 or claim 9, A skin treatment device in which the wiring portion and a portion of the electrode portion are arranged along the outer edge of the sheet substrate.

11. In the skin treatment apparatus according to claim 1, The conductive sheet is elongated in shape, The device body is a skin treatment device attached to the central or end portion in the longitudinal direction of the conductive sheet.

12. In the skin treatment apparatus according to claim 1, The conductive sheet is elongated, and is formed such that the width at one end is greater than the width at the other end. The device body is a skin treatment device attached to one end of the conductive sheet.

13. In the skin treatment apparatus according to claim 11 or claim 12, The conductive sheet is curved in the middle of its longitudinal direction, forming a C-shape or L-shape, in a skin treatment device.

14. In the skin treatment apparatus according to claim 1, The area of ​​the conductive sheet in plan view is A [mm²] ２ ] and the area of ​​the device body in plan view is B [mm²] ２ A skin treatment device in which, when ], the B / A ratio is 0.1 or more and 0.6 or less.

15. In the skin treatment apparatus according to claim 1, A skin treatment device wherein the resistance value of the entire conductive pattern and the bio-adhesive layer, or the conductive pattern alone, when not stretched is 1000 Ω or less.

16. In the skin treatment apparatus according to Claim 1, The conductive pattern comprises a plurality of wiring sections and a junction section formed by the convergence of the plurality of wiring sections, the junction section being wider than each of the wiring sections, in a skin treatment device.

17. In the skin treatment apparatus according to claim 16, A skin treatment device in which a portion of the wiring section forms a mesh at the end opposite to the junction.

18. A conductive sheet used to supply electric current to the user's skin, wherein at least a portion of it is stretchable in any direction, or at least a portion of it is flexible enough to conform to the skin surface, It comprises a sheet substrate, a conductive pattern, a bio-adhesive layer, and a masking portion. The conductive pattern is provided on one side of the sheet substrate. The bio-adhesive layer is provided on the side of the conductive pattern opposite to the sheet substrate and is configured to adhere to the user's skin surface. The masking portion is provided so as to cover a part of the sheet substrate and has at least one of the following functions: interposing between the conductive pattern and the user's skin surface during use to interrupt the current supplied to the user's skin surface, and reducing the elasticity of the conductive sheet.

19. In the conductive sheet according to claim 18, The aforementioned bio-adhesive layer is a conductive sheet in the form of a gel.

20. In the conductive sheet according to claim 18, The conductive sheet comprises a plurality of wiring sections and a confluence section formed by the merging of the plurality of wiring sections, the confluence section being wider than each of the wiring sections.

21. In the conductive sheet according to claim 20, A conductive sheet is formed in a mesh-like structure at the end opposite to the junction of the wiring section.

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