WO2021200805A1 - 生体センサ - Google Patents
生体センサ Download PDFInfo
- Publication number
- WO2021200805A1 WO2021200805A1 PCT/JP2021/013247 JP2021013247W WO2021200805A1 WO 2021200805 A1 WO2021200805 A1 WO 2021200805A1 JP 2021013247 W JP2021013247 W JP 2021013247W WO 2021200805 A1 WO2021200805 A1 WO 2021200805A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- biosensor
- adhesive layer
- skin
- base material
- sticking
- Prior art date
Links
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Definitions
- the present invention relates to a biosensor.
- biosensors that measure biometric information such as electrocardiogram, pulse wave, electroencephalogram, and myoelectricity are used.
- the biosensor is provided with a bioelectrode that contacts the living body and acquires the biometric information of the subject.
- the biosensor is attached to the skin of the subject and the bioelectrode is attached to the skin of the subject. I'm in contact.
- Biometric information is measured by acquiring electrical signals related to biometric information with bioelectrodes.
- a biosensor for example, a polymer layer having an electrode on one surface is provided, and dimethylvinyl-terminated dimethylsiloxane (DSDT) and tetramethyltetravinylcyclotetrasiloxane (TTC) are used as the polymer layer in a predetermined ratio.
- DSDT dimethylvinyl-terminated dimethylsiloxane
- TTC tetramethyltetravinylcyclotetrasiloxane
- a biocompatible polymer substrate using a polymerized polymer substrate is disclosed (see, for example, Patent Document 1).
- a polymer layer is attached to human skin, electrodes detect myocardial-derived voltage signals from human skin, and a data acquisition module detects myocardial-derived voltage signals. Is received and recorded.
- the biocompatible polymer substrate of Patent Document 1 has a polymer layer attached to the living body, there is a problem that the polymer layer is easily peeled off from the skin due to skin movement, sweat, or the like.
- a biosensor such as a biocompatible polymer substrate is often used by being attached to the skin for a long time, if the biosensor is peeled off from the skin during use, it may not be possible to stably measure biometric information. ..
- One aspect of the present invention is to provide a biosensor that can be stably attached to a living body.
- One aspect of the biological sensor according to the present invention is a biological sensor that is attached to a living body to acquire a biological signal, and is provided with a cover member and a porous base material having a porous structure provided on the living body side of the cover member.
- the sticking layer having the porous base material and the first adhesive layer provided on the surface of the porous base material on the living body side is attached in a direction orthogonal to the thickness direction of the sticking layer.
- it When deformed by 5% to 15% of the length of the layer, it has a shear stress of 5 ⁇ 10 4 N / m 2 to 65 ⁇ 10 4 N / m 2 , and the moisture permeability of the pasted layer is 65 (g / m). 2 ⁇ day) to 4000 (g / m 2 ⁇ day).
- One aspect of the biosensor according to the present invention can be stably attached to the living body.
- FIG. 1 is a cross-sectional view taken along the line II of FIG. It is a top view which shows the structure of a sensor part. It is an exploded perspective view of a part of the sensor part of FIG. It is explanatory drawing which shows the state which attached the biosensor to the skin of the living body (subject). It is explanatory drawing which shows an example of the test method for measuring the shear stress at the time of 10% deformation of a sticking layer. It is explanatory drawing which shows an example of the test method for measuring the shear stress at the time of 30% deformation of a biological sensor. It is explanatory drawing which shows the peeling position of a biological sensor.
- the biosensor according to this embodiment will be described.
- the living body means a human body (human body) and animals such as cows, horses, pigs, chickens, dogs and cats.
- the biosensor according to the present embodiment can be suitably used for a living body, particularly for a human body.
- a case where the biosensor is attached to the skin which is a part of the living body and the biometric information is measured will be described.
- FIG. 1 is a perspective view showing a configuration of a biosensor according to the present embodiment
- FIG. 2 is a sectional view taken along line I-I of FIG. 1
- FIG. 3 is a sectional view taken along line I-I of FIG.
- the biosensor 1 is a plate-shaped (sheet-shaped) member formed in a substantially elliptical shape in a plan view.
- the biosensor 1 includes a cover member 10, a first laminated sheet (first laminated body) 20, an electrode 30, a second laminated sheet (second laminated body) 40, and a sensor unit 50.
- the biological sensor 1 attaches the first laminated sheet 20, the electrode 30, and the second laminated sheet 40 to the skin 2 which is a living body, and acquires a biological signal.
- the cover member 10, the first laminated sheet 20, and the second laminated sheet 40 have substantially the same outer shape in a plan view.
- the sensor unit 50 is installed on the second laminated sheet 40 and is housed in the storage space S formed by the cover member 10 and the first laminated sheet 20.
- a three-dimensional Cartesian coordinate system in three axial directions (X-axis direction, Y-axis direction, Z-axis direction) is used, the lateral direction of the biosensor is the X-axis direction, the longitudinal direction is the Y-axis direction, and the height is high.
- the vertical direction (thickness direction) is the Z-axis direction.
- the direction opposite to the side (attachment side) on which the biological sensor is attached to the living body (subject) is the + Z-axis direction, and the side (attachment side) to which the biological sensor is attached to the living body (subject) is the -Z-axis direction.
- the + Z-axis direction side is referred to as an upper side or an upper side
- the -Z axis direction side is referred to as a lower side or a lower side, but does not represent a universal hierarchical relationship.
- the biosensor 1 attaches the sticking layer 21 forming a part of the first laminated sheet 20 to 5% of the length of the sticking layer 21 in the directions orthogonal to the thickness direction (X-axis direction and Y-axis direction). It has a shear stress of 5 ⁇ 10 4 N / m 2 to 65 ⁇ 10 4 N / m 2 when deformed by ⁇ 15%, and the moisture permeability of the sticking layer 21 is 65 (g / m 2 ⁇ day) to 4000 (g / m 2.day). g / m 2 ⁇ day).
- the inventor of the present application reduces the shear stress when the sticking layer 21 is deformed in the length direction (X-axis direction and Y-axis direction) to be appropriately softened, and keeps the moisture permeability of the sticking layer 21 within a predetermined range.
- the amount of deformation when the sticking layer 21 is deformed in the directions orthogonal to the thickness direction (X-axis direction and Y-axis direction) is 8% to 12% of the length of the sticking layer 21. Is preferable, 9.5% to 10.5% is more preferable, and 10% is most preferable.
- the shear stress when the sticking layer 21 is deformed by 5% to 15% of the length of the sticking layer 21 in the directions orthogonal to the thickness direction (X-axis direction and Y-axis direction) is 5 ⁇ 10 4 It is preferably N / m 2 to 15 ⁇ 10 4 N / m 2 , and more preferably 6 ⁇ 10 4 N / m 2 to 12 ⁇ 10 4 N / m 2 .
- the moisture permeability of the sticking layer 21 is preferably 50 (g / m 2 ⁇ day) to 5000 (g / m 2 ⁇ day), and 2000 (g / m 2 ⁇ day) to 4800 (g / m 2 ⁇ day). It is more preferably 2500 (g / m 2 ⁇ day) to 4500 (g / m 2 ⁇ day).
- the moisture permeability can be calculated by a known method, for example, by a moisture permeability test called a cup method, a MOCON method, or the like.
- the cup method is a method in which water vapor permeated through a material to be measured is absorbed by a hygroscopic agent contained in a cup, and the moisture permeability is measured from a change in the weight of the absorbed hygroscopic agent.
- the MOCON method is a method of measuring water vapor passing through a material to be measured by using an infrared sensor.
- the stress at the interface between the second laminated sheet 40 and the skin 2 can be relaxed, so that the biosensor 1 can be more flexibly deformed with respect to the contact surface with the skin 2. It is possible to further prevent the biosensor 1 from peeling off from the skin 2.
- the amount of deformation when the biosensor 1 is deformed in the total length direction (Y-axis direction) is preferably 28% to 32% of the length of the sticking layer 21, preferably 29.5% to 30.5. It is more preferably%, and most preferably 30%.
- the cover member 10 is located on the outermost side (+ Z-axis direction) of the biosensor 1 and is adhered to the upper surface of the first laminated sheet 20.
- the cover member 10 has a projecting portion 11 projecting substantially above the dome in the height direction (+ Z axis direction) of FIG. 1 at the central portion in the longitudinal direction (Y-axis direction), and is inside the projecting portion 11 ( On the sticking side), a recess 11a formed in a concave shape is formed on the living body side. Further, the lower surface (the surface on the sticking side) of the cover member 10 is formed flat. Inside the protruding portion 11 (on the sticking side), a storage space S for accommodating the sensor portion 50 is formed by the recess 11a on the inner surface of the protruding portion 11 and the through hole 211a of the porous base material 211.
- the cover member 10 for example, a flexible material such as silicone rubber, fluororubber, or urethane rubber can be used. Further, the cover member 10 can be formed by laminating the above-mentioned flexible material on the surface of the support using a base resin such as polyethylene terephthalate (PET) as the support.
- PET polyethylene terephthalate
- the thickness of the upper surface and the side wall of the protruding portion 11 of the cover member 10 is thicker than the thickness of the flat portions 12a and 12b provided on both ends in the longitudinal direction (Y-axis direction) of the cover member 10.
- the flexibility of the protruding portion 11 can be made lower than the flexibility of the flat portions 12a and 12b, and the sensor portion 50 can be protected from the external force applied to the biological sensor 1.
- the thickness of the upper surface and the side wall of the protruding portion 11 is preferably 1.5 mm to 3 mm, and the thickness of the flat portions 12a and 12b is preferably 0.5 mm to 1 mm.
- the thin flat portions 12a and 12b have higher flexibility than the protruding portions 11, when the biosensor 1 is attached to the skin 2, the surface of the skin 2 due to body movements such as stretching, bending, and twisting It can be easily deformed by following the deformation. As a result, when the surface of the skin 2 is deformed, the stress applied to the flat portions 12a and 12b can be relaxed, and the biosensor 1 can be made difficult to peel off from the skin 2.
- the outer peripheral portions of the flat portions 12a and 12b have a shape in which the thickness gradually decreases toward the ends. As a result, the flexibility of the outer peripheral portions of the flat portions 12a and 12b can be further increased, and the biosensor 1 is attached to the skin 2 as compared with the case where the thickness of the outer peripheral portions of the flat portions 12a and 12b is not reduced. It is possible to improve the wearing feeling when the skin is worn.
- the hardness (strength) of the cover member 10 is preferably 40 to 70, more preferably 50 to 60.
- the third adhesive layer 42 provided on the surface on the sticking side ( ⁇ Z axis direction) of the second base material 41 when the skin 2 is stretched by body movement. Can easily relieve the stress at the interface with the skin 2.
- the hardness (hardness) refers to Shore A hardness.
- the first laminated sheet 20 is provided so as to be adhered to the lower surface of the cover member 10.
- the first laminated sheet 20 has a through hole 20a at a position facing the protruding portion 11 of the cover member 10.
- the through hole 20a allows the sensor body 52 of the sensor unit 50 to be housed in the storage space S formed by the recess 11a on the inner surface of the cover member 10 and the through hole 20a without being blocked by the first laminated sheet 20. can.
- the first laminated sheet 20 has a sticking layer 21 and a second adhesive layer 22 provided on the surface on the cover member 10 side (+ Z axis direction).
- the sticking layer 21 has a porous base material 211 and a first adhesive layer 212 provided on the surface of the porous base material 211 on the living body side ( ⁇ Z axis direction).
- the porous base material 211 has a porous structure, and can be formed by using a porous body having flexibility, waterproofness, and moisture permeability.
- a porous body for example, a foam material such as open cells, closed cells, and semi-closed cells can be used. As a result, water vapor due to sweat or the like generated from the skin 2 to which the biosensor 1 is attached can be released to the outside of the biosensor 1 via the porous base material 211.
- the moisture permeability of the porous substrate 211 is preferably 100 (g / m 2 ⁇ day) to 5000 (g / m 2 ⁇ day), and 1000 (g / m 2 ⁇ day) to 4500 (g / m 2). ⁇ Day) is more preferred, and 2000 (g / m 2 ⁇ day) to 4100 (g / m 2 ⁇ ⁇ day) is even more preferred.
- the porous base material 211 allows water vapor that has entered from one surface side to enter the porous base material 211. Can be stably discharged from the other surface side.
- thermoplastic resin such as a polyurethane resin, a polystyrene resin, a polyolefin resin, a silicone resin, an acrylic resin, a vinyl chloride resin, or a polyester resin can be used.
- a thermoplastic resin such as a polyurethane resin, a polystyrene resin, a polyolefin resin, a silicone resin, an acrylic resin, a vinyl chloride resin, or a polyester resin.
- the thickness of the porous base material 211 can be appropriately set, and can be, for example, 0.5 mm to 1.5 mm.
- the porous base material 211 has a through hole 211a at a position facing the protruding portion 11 of the cover member 10.
- the through hole 20a can be formed by forming the first adhesive layer 212 and the second adhesive layer 22 on the surface of the porous base material 211 other than the through hole 211a.
- the first adhesive layer 212 is provided by being attached to the lower surface of the porous base material 211, and adheres the porous base material 211 and the second base material 41, and also adheres the porous base material 211 and the electrode. It has a function of adhering to 30.
- the first adhesive layer 212 preferably has moisture permeability. Water vapor and the like generated from the skin 2 to which the biosensor 1 is attached can be released to the porous base material 211 via the first adhesive layer 212. Further, since the porous base material 211 has a bubble structure as described above, water vapor can be released to the outside of the biosensor 1 via the second adhesive layer 22. As a result, it is possible to prevent sweat or water vapor from accumulating at the interface between the skin 2 to which the biosensor 1 is attached and the third adhesive layer 42. As a result, the adhesive force of the first adhesive layer 212 is weakened by the moisture accumulated at the interface between the skin 2 and the first adhesive layer 212, and it is possible to prevent the biosensor 1 from peeling off from the skin 2.
- the moisture permeability of the first adhesive layer 212 is preferably 1 (g / m 2 ⁇ day) or more, and more preferably 10 (g / m 2 ⁇ day) or more. Furthermore, moisture permeability of the first adhesive layer 212 is less 10000 (g / m 2 ⁇ day ).
- moisture permeability of the first adhesive layer 212 is 10 (g / m 2 ⁇ day) or more, when the third adhesive layer 42 is attached to the skin 2, sweat or the like transmitted from the second laminated sheet 40 is externally removed. Since it can be permeated toward the skin 2, the load on the skin 2 can be suppressed.
- the material forming the first adhesive layer 212 is preferably a material having pressure-sensitive adhesiveness, and the same material as the third adhesive layer 42 can be used, and an acrylic pressure-sensitive adhesive may be used. preferable.
- the first adhesive layer 212 a double-sided adhesive tape formed of the above material can be used.
- the cover member 10 is laminated on the first adhesive layer 212 to form the biosensor 1, the waterproof property of the biosensor 1 can be improved and the bonding strength with the cover member 10 can be improved.
- the surface of the first adhesive layer 212 is formed with a wavy pattern (web pattern) in which a pressure-sensitive adhesive-forming portion in which a pressure-sensitive adhesive is present and a portion to be adhered without the pressure-sensitive adhesive are alternately formed. May be good.
- a double-sided adhesive tape having a web pattern formed on its surface can be used as the first adhesive layer 212. By having the web pattern on the surface of the first adhesive layer 212, the adhesive can be attached to the convex portion of the surface and its periphery, and the adhesive can be prevented from being attached to the concave portion of the surface and its periphery.
- the adhesive can be scattered on the surface of the first adhesive layer 212. can.
- the moisture permeability of the first adhesive layer 212 tends to increase as the adhesive is thinner. Therefore, the first adhesive layer 212 has a web pattern formed on its surface, and the adhesive has a partially thin portion, so that the adhesive strength is maintained as compared with the case where the web pattern is not formed. , Moisture permeability can be improved.
- the width between the pressure-sensitive adhesive forming portion and the portion to be adhered can be appropriately designed, and the width of the portion to be adhered is preferably, for example, 500 ⁇ m to 1000 ⁇ m, and the width of the portion to be adhered is 1500 ⁇ m to 5000 ⁇ m. Is preferable.
- the widths of the pressure-sensitive adhesive-forming portion and the portion to be adhered are within the above-mentioned preferable ranges, the first adhesive layer 212 can exhibit excellent moisture permeability while maintaining the adhesive strength.
- the thickness of the first adhesive layer 212 can be arbitrarily set as appropriate, preferably 10 ⁇ m to 300 ⁇ m, more preferably 50 ⁇ m to 200 ⁇ m, and even more preferably 70 ⁇ m to 110 ⁇ m. When the thickness of the first adhesive layer 212 is 10 ⁇ m to 300 ⁇ m, the biosensor 1 can be made thinner.
- the second adhesive layer 22 is provided in a state of being attached to the upper surface of the porous base material 211.
- the second adhesive layer 22 is attached to the upper surface of the porous base material 211 at a position corresponding to the flat surface on the attachment side ( ⁇ Y axis direction) of the cover member 10, and the porous base material 211 and the cover member 10 are attached. Has the function of adhering to.
- a silicon-based adhesive As a material for forming the second adhesive layer 22, a silicon-based adhesive, a silicon tape, or the like can be used.
- the thickness of the second adhesive layer 22 can be appropriately set, and can be, for example, 10 ⁇ m to 300 ⁇ m.
- the electrode 30 is connected to the lower surface of the first adhesive layer 212 on the sticking side ( ⁇ Z axis direction), while a part of the electrode 30 on the sensor body 52 side is connected to the wirings 53a and 53b. It is attached in a state of being sandwiched between the first adhesive layer 212 and the fourth adhesive layer 43. The portion of the electrode 30 that is not sandwiched between the first adhesive layer 212 and the fourth adhesive layer 43 comes into contact with the living body.
- the biological signal is, for example, an electric signal representing an electrocardiographic waveform, an electroencephalogram, a pulse, or the like.
- the electrode 30 may be embedded in the second base material 41 in a state of being exposed so as to be in contact with the skin 2.
- the electrode 30 can be formed by using an electrode sheet formed in the form of a cured product, metal, alloy or the like of a conductive composition containing a conductive polymer and a binder resin.
- the conductive polymer examples include polythiophene-based conductive polymer, polyaniline-based conductive polymer, polypyrrole-based conductive polymer, polyacetylene-based conductive polymer, polyphenylene-based conductive polymer and derivatives thereof, and these. Complex and the like can be used. These may be used alone or in combination of two or more. Among these, a composite obtained by doping polythiophene with polyaniline as a dopant is preferable.
- polystyrene sulfonic acid poly4-styrene sulfo
- PEDOT poly3,4-ethylenedioxythiophene
- the electrode 30 has a plurality of through holes 31 on the contact surface with the skin 2. As a result, the electrode 30 can be exposed to the sticking side from the through hole 31 in a state where the electrode 30 is stuck to the first adhesive layer 212, so that the adhesion between the electrode 30 and the skin 2 can be improved. Can be enhanced.
- the second laminated sheet 40 has a second base material 41, a third adhesive layer 42, and a fourth adhesive layer 43.
- the outer shape of the second base material 41 on both sides of the third adhesive layer 42 in the width direction (X-axis direction) is the width direction (X-axis direction) of the first laminated sheet 20 and the cover member 10.
- the length of the second base material 41 (Y-axis direction) is shorter than the length of the cover member 10 and the first laminated sheet 20 (Y-axis direction).
- Both ends of the second laminated sheet 40 in the longitudinal direction are positions where the wirings 53a and 53b of the sensor unit 50 are sandwiched between the second laminated sheet 40 and the first laminated sheet 20, and overlap with a part of the electrodes 30. It is in.
- the fourth adhesive layer 43 is provided on the upper surface of the second base material 41, and the first adhesive layer 212 is provided on the sticking surface of the first laminated sheet 20.
- the waterproofness and moisture permeability differ depending on the position of the sticking surface, and the adhesiveness also differs.
- the entire biosensor 1 has the adhesiveness on the sticking surface corresponding to the first laminated sheet 20. Will have a great effect on the sticking performance to the skin 2.
- the second base material 41 can be formed by using a flexible resin having appropriate elasticity, flexibility and toughness.
- the material forming the second base material 41 include polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate; Acrylic resins such as polyacrylic acid, polymethacrylic acid, methyl polyacrylate, polymethylmethacrylate (PMMA), ethyl polymethacrylate, butyl polyacrylate; polyolefin resins such as polyethylene and polypropylene; polystyrene, imide-modified polystyrene , Acrylonitrile-butadiene-styrene (ABS) resin, imide-modified ABS resin, styrene-acrylonitrile copolymerized (SAN) resin, acrylonitrile-ethylene-propylene-diene-styrene (AES)
- thermoplastic resins are waterproof (low moisture permeability). Therefore, the second base material 41 is formed by using these thermoplastic resins, so that the sweat or water vapor generated from the skin 2 is secondly generated while the biosensor 1 is attached to the skin 2 of the living body. It is possible to prevent the sensor unit 50 from entering the flexible substrate 51 side through the base material 41.
- the second base material 41 is formed in a flat plate shape.
- the thickness of the second base material 41 can be arbitrarily selected, for example, preferably 1 ⁇ m to 300 ⁇ m, more preferably 5 ⁇ m to 100 ⁇ m, and further preferably 10 ⁇ m to 50 ⁇ m.
- the third adhesive layer 42 is provided on the lower surface of the second base material 41 on the sticking side ( ⁇ Z axis direction), and is a layer that comes into contact with a living body.
- the third adhesive layer 42 preferably has pressure-sensitive adhesiveness. Since the third adhesive layer 42 has pressure-sensitive adhesiveness, it can be easily attached to the skin 2 by pressing the biological sensor 1 against the skin 2 of the living body.
- the material of the third adhesive layer 42 is not particularly limited as long as it has pressure-sensitive adhesiveness, and examples thereof include materials having biocompatibility.
- Examples of the material forming the third adhesive layer 42 include an acrylic pressure-sensitive adhesive and a silicone-based pressure-sensitive adhesive. Preferably, an acrylic pressure-sensitive adhesive is used.
- the acrylic pressure-sensitive adhesive preferably contains an acrylic polymer as a main component.
- the acrylic polymer can function as a pressure sensitive adhesive component.
- the acrylic polymer is a monomer component containing (meth) acrylic acid ester such as isononyl acrylate and methoxyethyl acrylate as a main component and a monomer copolymerizable with (meth) acrylic acid ester such as acrylic acid as an optional component.
- a polymer obtained by polymerizing the above can be used.
- the acrylic pressure-sensitive adhesive preferably further contains a carboxylic acid ester.
- the carboxylic acid ester functions as a pressure-sensitive adhesive force adjusting agent that reduces the pressure-sensitive adhesive force of the acrylic polymer and adjusts the pressure-sensitive adhesive force of the third adhesive layer 42.
- a carboxylic acid ester compatible with the acrylic polymer can be used.
- trifatty acid glyceryl and the like can be used.
- the acrylic pressure-sensitive adhesive may contain a cross-linking agent, if necessary.
- the cross-linking agent is a cross-linking component that cross-links the acrylic polymer.
- examples of the cross-linking agent include polyisocyanate compounds (polyfunctional isocyanate compounds), epoxy compounds, melamine compounds, peroxide compounds, urea compounds, metal alkoxide compounds, metal chelate compounds, metal salt compounds, carbodiimide compounds, oxazoline compounds, aziridine compounds, and amines. Examples include compounds. Among these, a polyisocyanate compound is preferable. These cross-linking agents may be used alone or in combination.
- the third adhesive layer 42 preferably has excellent biocompatibility.
- the keratin peeling area ratio is preferably 0% to 50%, more preferably 1% to 15%.
- the exfoliated area ratio of the keratin is within the range of 0% to 50%, the load on the skin 2 can be suppressed even if the third adhesive layer 42 is attached to the skin 2.
- the third adhesive layer 42 preferably has moisture permeability. Water vapor or the like generated from the skin 2 to which the biosensor 1 is attached can be released to the first laminated sheet 20 side via the third adhesive layer 42. Further, since the first laminated sheet 20 has a bubble structure as described later, water vapor can be released to the outside of the biosensor 1 via the third adhesive layer 42. As a result, it is possible to prevent sweat or water vapor from accumulating at the interface between the skin 2 to which the biosensor 1 is attached and the third adhesive layer 42. As a result, the adhesive force of the third adhesive layer 42 is weakened by the water accumulated at the interface between the skin 2 and the third adhesive layer 42, and it is possible to prevent the biosensor 1 from peeling off from the skin.
- the moisture permeability of the third adhesive layer 42 is preferably 300 (g / m 2 ⁇ day) or more, more preferably 600 (g / m 2 ⁇ day) or more, and 1000 (g / m 2 ⁇ day) or more. Day) or more is more preferable. Furthermore, moisture permeability of the third adhesive layer 42 is less 10000 (g / m 2 ⁇ day ). If the moisture permeability of the third adhesive layer 42 is 300 (g / m 2 ⁇ day) or more, even if the third adhesive layer 42 is attached to the skin 2, the sweat or the like generated from the skin 2 is appropriately seconded. Since it can be permeated from the base material 41 to the outside, the burden on the skin 2 can be reduced.
- the thickness of the third adhesive layer 42 can be arbitrarily selected and is preferably 10 ⁇ m to 300 ⁇ m. When the thickness of the third adhesive layer 42 is 10 ⁇ m to 300 ⁇ m, the biosensor 1 can be made thinner.
- the fourth adhesive layer 43 is provided on the upper surface of the second base material 41 on the cover member 10 side (+ Z axis direction), and is a layer to which the sensor portion 50 is adhered. Since the same material as the third adhesive layer 42 can be used for the fourth adhesive layer 43, the details will be omitted.
- the fourth adhesive layer 43 does not necessarily have to be provided, and may not be provided.
- FIG. 4 is a plan view showing the configuration of the sensor unit 50
- FIG. 5 is an exploded perspective view of a part of the sensor unit 50.
- the broken line in FIG. 4 indicates the outer diameter of the cover member 10.
- the sensor unit 50 includes a flexible substrate 51 on which various components for acquiring biometric information are mounted, a sensor body 52, and wiring 53a connected to the sensor body 52 in the longitudinal direction thereof. And 53b, a battery 54, a positive electrode pattern 55, a negative electrode pattern 56, and a conductive adhesive tape 57.
- a positive electrode pattern 55, a conductive adhesive tape 57, a battery 54, a conductive adhesive tape 57 and a negative electrode pattern 56 are arranged in this order from the pad portion 522a side. It is laminated over the pad portion 522b side.
- the positive electrode terminal of the battery 54 is in the ⁇ Z axis direction and the negative electrode terminal is in the + Z axis direction, but the reverse is also possible, the positive electrode terminal is in the + Z axis direction, and the negative electrode terminal is in the ⁇ Z axis direction. good.
- the flexible substrate 51 is a resin substrate, and the sensor main body 52 and the wirings 53a and 53b are integrally formed on the flexible substrate 51.
- One ends of the wirings 53a and 53b are connected to the electrodes 30, respectively, as shown in FIG. As shown in FIG. 4, the other end of the wiring 53a is connected to a switch or the like mounted on the component mounting portion 521 along the outer circumference of the sensor main body 52. The other end of the wiring 53b is also connected to a switch or the like mounted on the component mounting portion 521, similarly to the wiring 53a.
- the wirings 53a and 53b may be formed on either the front surface side or the back surface side wiring layer of the flexible substrate 51.
- the sensor main body 52 has a component mounting unit 521 which is a control unit and a battery mounting unit 522.
- the component mounting unit 521 is a flexible substrate 51 such as a CPU and an integrated circuit that processes a biological signal acquired from a living body to generate biological signal data, a switch that activates a biological sensor 1, a flash memory that stores the biological signal, and a light emitting element. It has various parts to be mounted on. A circuit example using various parts will be omitted.
- the component mounting unit 521 operates by the electric power supplied from the battery 54 mounted on the battery mounting unit 522.
- the component mounting unit 521 transmits by wire or wirelessly to an external device such as an operation confirmation device for confirming the initial operation and a reading device for reading biometric information from the biosensor 1.
- the battery mounting unit 522 supplies electric power to an integrated circuit or the like mounted on the component mounting unit 521. As shown in FIG. 2, the battery 54 is mounted on the battery mounting portion 522.
- the battery mounting portion 522 is arranged between the wiring 53a and the component mounting portion 521, and has pad portions 522a and 522b and a constricted portion 522c.
- the pad portion 522a is provided between the wiring 53a and the component mounting portion 521, is located on the positive electrode terminal side of the battery 54, and has a positive electrode pattern 55 to which the positive electrode terminal is connected. There is.
- the pad portion 522b is provided in the direction orthogonal to the pad portion 522a in the longitudinal direction (upper direction in FIG. 3) at a predetermined interval from the pad portion 522a.
- the pad portion 522b is located on the negative electrode terminal (second terminal) side of the battery 54 and has a negative electrode pattern 56 to which the negative electrode terminal is connected.
- the constricted portion 522c is arranged between the pad portions 522a and 522b, and connects the pad portions 522a and 522b to each other.
- the battery 54 is arranged between the positive electrode pattern 55 and the negative electrode pattern 56.
- the battery 54 has a positive electrode terminal and a negative electrode terminal, and a known battery can be used.
- a coin-type battery such as CR2025 can be used.
- the positive electrode pattern 55 is located on the positive electrode terminal side of the battery 54 and is connected to the positive electrode terminal.
- the positive electrode pattern 55 has a rectangular shape with chamfered corners.
- the negative electrode pattern 56 is located on the negative electrode terminal side of the battery 54 and is connected to the negative electrode terminal.
- the negative electrode pattern 56 has a shape substantially corresponding to the size of the circular shape of the negative electrode terminal of the battery 54.
- the diameter of the negative electrode pattern 56 is equal to, for example, the diameter of the battery 54, and has a size substantially equal to the diagonal length of the positive electrode pattern 55.
- the conductive adhesive tape 57 is a conductive adhesive, and is arranged between the battery 54 and the positive electrode pattern 55 and between the battery 54 and the negative electrode pattern 56, respectively.
- the conductive adhesive tape may also be generally referred to as a conductive adhesive sheet, a conductive adhesive film, or the like.
- the conductive adhesive tape 57A and the conductive adhesive tape 57B are attached to the entire positive electrode pattern 55 and the negative electrode pattern 56, respectively. Then, the positive electrode terminal and the negative electrode terminal of the battery 54 are attached to the positive electrode pattern 55 and the negative electrode pattern 56 via the conductive adhesive tape 57A and the conductive adhesive tape 57B, respectively, so that the battery 54 is attached to the battery mounting portion 522. It is installed.
- the sensor body 52 shown in FIG. 4 has a state in which the constricted portion 522c is bent and the battery 54 is mounted on the battery mounting portion 522 with the battery 54 sandwiched between the positive electrode pattern 55 and the negative electrode pattern 56. Shown.
- the biosensor 1 is released from the release paper 60 until the biosensor 1 is stuck to the skin 2. It is preferable to paste. By peeling the release paper 60 from the second base material 41 and the electrode 30 at the time of use, the adhesive strength of the second base material 41 can be maintained.
- FIG. 6 is an explanatory view showing a state in which the biosensor 1 of FIG. 1 is attached to the chest of the living body P.
- the biosensor 1 is attached to the skin of the subject P with the longitudinal direction (Y-axis direction) aligned with the sternum of the subject P, one electrode 30 on the upper side, and the other electrode 30 on the lower side. ..
- the electrode 30 is attached to the skin of the subject P by the third adhesive layer 42 of FIG. 2, and the electrode 30 is pressure-bonded to the skin of the subject P.
- Acquire biological signals such as electrocardiogram signals.
- the biological sensor 1 stores the acquired biological signal data in a non-volatile memory such as a flash memory mounted on the component mounting unit 521.
- the biosensor 1 includes the cover member 10 and the porous base material 211, and the sticking layer 21 having the porous base material 211 and the first adhesive layer 212 is orthogonal to the thickness direction of the sticking layer 21.
- the shear stress When deformed by 5% to 15% of the length of the sticking layer 21 in the direction (X-axis direction or Y-axis direction), there is a shear stress of 5 ⁇ 10 4 N / m 2 to 65 ⁇ 10 4 N / m 2.
- the moisture permeability of the sticking layer 21 is 65 (g / m 2 ⁇ day) to 4000 (g / m 2 ⁇ day).
- the shear stress when the sticking layer 21 is deformed is increased to soften it, and the moisture permeability of the sticking layer 21 is kept within a predetermined range to improve the air permeability, so that the entire sticking layer 21 is appropriate.
- the attachment side of the second base material 41 (-) Since the stress generated at the interface between the third adhesive layer 42 provided on the surface (in the Z-axis direction) and the skin 2 can be relaxed, it is possible to prevent the biosensor 1 from peeling off from the skin 2. Therefore, the biosensor 1 can be stably attached to the skin 2.
- the electrode 30 is provided on a part of the sticking surface of the first adhesive layer 212, and the porous base material 211 has a through hole 211a in a substantially central portion thereof. Therefore, it is important that the first adhesive layer 212 easily follows the movement of the skin 2 and that the biosensor 1 is flexible.
- the shearing force of the sticking layer 21 is set within a predetermined range, the shear stress when the sticking layer 21 is deformed is increased to soften it, and the moisture permeability of the sticking layer 21 is within a predetermined range. Therefore, the air permeability can be enhanced and the entire sticking layer 21 can be provided with appropriate flexibility.
- the biosensor 1 can suppress peeling of at least a part of the biosensor 1 from the subject's skin 2 even if the subject moves during its use, so that the biometric information can be stably obtained from the skin 2. Can be measured.
- the biosensor 1 can be provided with the second adhesive layer 22 on the surface on the cover member 10 side which is the upper surface of the sticking layer 21.
- the first laminated sheet 20 can be made softer, so that when the skin 2 is stretched by body movement, the first adhesive layer 212 and the third adhesive layer 42 are more deformed along the interface with the skin 2.
- the stress generated at the interface between the first adhesive layer 212 and the third adhesive layer 42 and the skin 2 can be further relaxed. Therefore, since the biosensor 1 can further suppress the peeling from the skin 2, it is possible to maintain the state of being more stably attached to the skin 2.
- the biosensor 1 can set the hardness of the cover member 10 to 40 to 70.
- the cover member 10 can have an appropriate softness, so that it is possible to reduce the hindrance of deformation of the second laminated sheet 40 by the cover member 10. Therefore, when the skin 2 is stretched due to body movement, the third adhesive layer 42 can be more easily deformed along the interface with the skin 2, so that the stress at the interface between the third adhesive layer 42 and the skin 2 can be easily deformed. Can be further relaxed. Therefore, since the biosensor 1 can suppress the peeling from the skin 2 more stably, the state of being attached to the skin 2 can be maintained more stably.
- the biosensor 1 can set the moisture permeability of the porous base material 211 to 100 (g / m 2 ⁇ day) to 5000 (g / m 2 ⁇ day).
- the porous base material 211 can stably release the water vapor generated in the skin 2 to the outside of the biological sensor 1 via the first adhesive layer 212 and the second adhesive layer 22, so that the porous base material 211 can be peeled off from the skin 2. Can be further suppressed.
- the biosensor 1 is 5 ⁇ 10 4 N / m 2 to 25 ⁇ 10 4 N when the biosensor 1 is deformed by 25% to 35% of the total length (Y-axis direction) of the biosensor 1 with respect to the contact surface with the skin 2. It can have a shear stress of / m 2.
- the amount of deformation of the biosensor with respect to the contact surface with the skin 2 is 20% or less of the total length of the biosensor 1.
- its shear stress can be 5 ⁇ 10 4 N / m 2 to 25 ⁇ 10 4 N / m 2 , so that the biosensor 1 can be used.
- the biosensor 1 can be more stably suppressed from peeling from the skin 2, so that the state of attachment to the skin 2 is more stable. Can be maintained.
- the biosensor 1 includes an electrode 30, a second base material 41, and a sensor body 52, the cover member 10 has a concave portion 11a formed on the skin 2 side, and the porous base material 211 corresponds to the depression 11a.
- a through hole 211a is provided at the position where the through hole 211a is formed, and the accommodation space S can be formed by the recess 11a and the through hole 211a. Even if the biosensor 1 is provided with the sensor body 52 inside, the first adhesive layer 212 can further suppress peeling from the skin 2 and can maintain a state of being stably attached to the skin 2.
- the biological sensor 1 includes a third adhesive layer 42, and the first adhesive layer 212 and the third adhesive layer 42 can form a surface to be attached to the living body.
- the third adhesive layer 42 can further suppress the peeling from the skin 2, and the third adhesive layer 42 is stable on the skin 2. Can be maintained in a sticky state.
- the biosensor 1 can be provided with a through hole 31 in the electrode 30.
- the adhesion between the electrode 30 and the skin 2 can be improved. Therefore, in the biosensor 1, the electrode 30 is stuck to the first sticky layer 212. Even if it is, it is possible to prevent the first adhesive layer 212 from peeling off from the skin 2, and it is possible to maintain a state in which the first adhesive layer 212 is stably attached to the skin 2.
- the biosensor 1 can be made difficult to peel off from the skin 2 as described above, it can be suitably used for, for example, a wearable device for healthcare such as a biosensor.
- the first adhesive layer (long-term sticking tape 1) is formed on the lower surface of a rectangular-shaped porous base material 1 (polyolefin foam sheet (“Folec®”, manufactured by Inoac Corporation, thickness: 0.5 mm)). (Manufactured by Nitto Denko Corporation, thickness: 70 ⁇ m)) was formed to form a sticking layer.
- the long-term sticking tape 1 had an adhesive-free adhesive-forming portion having a width of about 500 ⁇ m and adhesive on its surface.
- a double-sided adhesive tape having a wavy pattern (web pattern) formed so that the width of the adhesive-free portion is about 1500 ⁇ m.
- a second adhesive layer for silicone is formed on the upper surface of the adhesive layer.
- Tape 1 (“ST503 (HC) 60”, manufactured by Nitto Denko Corporation, thickness: 60 ⁇ m) was formed to prepare a first laminated sheet.
- Adhesive 1 (Permilol) as a third adhesive layer on both sides of a rectangular base material 1 (PET ("PET-50-SCA1 (white)", manufactured by Mitsui Bussan Plastics Co., Ltd.), thickness: 38 ⁇ m) , Nitto Denko KK), moisture permeability: 21 (g / m 2 ⁇ day)) was attached to prepare a second laminated sheet which is a skin tape.
- a cover member was produced by forming a coat layer having a shore hardness of A40 formed of silicone rubber on a support formed by using PET as a base resin and molding it into a predetermined shape.
- a sensor unit including a battery and a control unit was installed in the central portion of the upper surface of the second laminated sheet. After that, a pair of electrodes were attached to the attachment surface side of the first adhesive layer while being sandwiched between the first adhesive layer and the second laminated sheet of the first laminated sheet, and the electrodes and the wiring of the sensor unit were connected. .. After that, the cover member was laminated on the first laminated sheet so that the sensor unit was arranged in the accommodation space formed by the first laminated sheet and the cover member, to produce a biosensor.
- the biosensor was used as a cover member, a laminated body of the first laminated sheet and the second laminated sheet, and the laminated body was used to prepare a test body having a size of 1 cm in width ⁇ 4 cm in length.
- the adhesive surface of the test piece was attached to a collagen film (“Nippi Casing # 300”, manufactured by Nippi Collagen Co., Ltd.) fixed to a stainless steel plate (SUS plate) to prepare a test piece.
- the test piece was pulled parallel to the stainless steel plate at a rate of 360 mm / min until the length of the test piece was deformed by 30%, and the shear stress when the test piece was deformed by 30% in the length direction was measured.
- the sticking stability of the biosensor was evaluated by sticking it on the skins of a plurality of men and women for 24 hours, and observing the presence or absence of peeling and the peeling position at that time. If the biosensor did not peel off from the skin of multiple men or women even once, the stability of application was evaluated as excellent (marked A in Table 1), and the skin of multiple men or women was evaluated. If it is peeled off several times, it is evaluated as good (marked B in Table 1), and if it is peeled off from the skin of all men or women, the stability of sticking the biosensor is poor. Evaluation (C mark in Table 1) was performed.
- the peeling position is the region between the central portion of the adhesive layer and the electrode in the plan view of the biosensor (region A in FIG. 9) or the region where the electrode is arranged in the plan view of the biosensor (FIG. 9). It was confirmed whether it was the area B) of.
- Example 2 In Example 1, the same procedure as in Example 1 was carried out except that the thickness of the porous base material 1 was changed to change the shearing force when the porous base material 1 was deformed.
- Example 7 In Example 1, the thickness of the porous base material 1 was changed, the type of the second adhesive layer of the first laminated sheet was changed to the following long-term sticking tape 2, and the shearing force when the sticking layer was deformed was increased. Along with the change, the type of cover member was changed. Other than that, it was carried out in the same manner as in Example 1.
- the long-term sticking tape 2 is a double-sided adhesive tape that is formed of the same adhesive as the long-term sticking tape 1 and does not have a wavy pattern on its surface.
- -Second adhesive layer Tape for long-term sticking 2 (manufactured by Nitto Denko, thickness: 60 ⁇ m)
- Example 8 In Example 1, the thickness of the porous base material 1 was changed, the type of the second adhesive of the sheet layer was changed to the following long-term sticking tape 3, and the shearing force when the sticking layer was deformed was changed. Except for the above, the procedure was the same as in Example 1. -Second adhesive: long-term sticking tape 3 ("SLY-25", manufactured by Nitto Denko Corporation), thickness: 25 ⁇ m)
- Example 1 In Example 1, the same procedure as in Example 1 was carried out except that the porous base material 1 was not used.
- Example 2 In Example 1, when the porous base material 1 is changed to the porous base material 2, the type of the first adhesive layer on the lower surface side of the second laminated sheet is changed to the following long-term sticking tape 2, and the sticking layer is deformed. This was carried out in the same manner as in Example 1 except that the shearing force of the above was changed.
- -Perforated base material 2 "Borara”, manufactured by Sekisui Chemical Co., Ltd.), thickness: 1 mm
- -Second adhesive Tape for long-term application 2 ("SLY-25", manufactured by Nitto Denko, thickness: 35 ⁇ m)
- Table 1 shows the types of cover members, the configuration of the first laminated sheet, the configuration of the second laminated sheet, and the evaluation results of the characteristics of the biosensor in each of the examples and comparative examples.
- the shear stress when the sticking layer was deformed by 10% was 15 ⁇ 10 4 N / m 2 or less, and the moisture permeability of the sticking layer was 92.4 (g). It was / m 2 ⁇ day) to 3891 (g / m 2 ⁇ day).
- the moisture permeability of the sticking layer was 76 (g / m 2 ⁇ day) or less.
- the biosensors of Examples 1 to 8 have a shear stress of 15 ⁇ 10 4 N / m 2 or less when the sticking layer is deformed by 10%, and the sticking layer has a shear stress of 15 ⁇ 10 4 N / m 2.
- the moisture permeability from 92.4 (g / m 2 ⁇ day) to 3891 (g / m 2 ⁇ day)
- the biosensor according to the present embodiment can be stably attached to the skin, it can be said that an electric signal obtained from the living body can be stably detected with high sensitivity. Therefore, it can be said that the biosensor can be effectively used to bring the biosensor into close contact with the skin of the subject and continuously measure the electrocardiogram for a long time (for example, 24 hours).
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Abstract
Description
本実施形態に係る生体センサについて説明する。生体とは、人体(人)、並びに牛、馬、豚、鶏、犬及び猫等の動物等をいう。本実施形態に係る生体センサは、生体用、中でも人体用として好適に用いることができる。本実施形態では、一例として、生体の一部である皮膚に生体センサを貼付して生体情報の測定を行う貼付型生体センサである場合について説明する。
図1~図3に示すように、カバー部材10は、生体センサ1の最も外側(+Z軸方向)に位置しており、第1積層シート20の上面に接着されている。カバー部材10は、長手方向(Y軸方向)の中央部分に、図1の高さ方向(+Z軸方向)に向けて略ドーム上に突出した突出部11を有し、突出部11の内側(貼付側)には生体側に凹状に形成された窪み11aが形成されている。また、カバー部材10の下面(貼付側の面)は、平坦に形成されている。突出部11の内側(貼付側)には、突出部11の内面の窪み11aと、多孔基材211の貫通孔211aとにより、センサ部50を収納する収納空間Sが形成される。
図3に示すように、第1積層シート20は、カバー部材10の下面に接着して設けられている。第1積層シート20は、カバー部材10の突出部11に対向する位置に貫通孔20aを有する。貫通孔20aにより、センサ部50のセンサ本体52を、第1積層シート20に遮られることなく、カバー部材10の内面の窪み11aと貫通孔20aとにより形成される収納空間Sに収納させることができる。
図3に示すように、貼付層21は、多孔基材211と、多孔基材211の生体側(-Z軸方向)の面に設けられた第1粘着層212とを有している。
多孔基材211は、多孔質構造を有しており、可撓性、防水性及び透湿性を有する多孔質体を用いて形成することができる。多孔質体として、例えば、連続気泡、独立気泡、半独立気泡等の発泡素材を用いることができる。これにより、生体センサ1が貼り付けられた皮膚2から発生する汗等による水蒸気を、多孔基材211を介して生体センサ1の外部に放出することができる。
図3に示すように、第1粘着層212は、多孔基材211の下面に貼り付けられて設けられており、多孔基材211と第2基材41を接着すると共に多孔基材211と電極30とを接着する機能を有する。
図3に示すように、第2粘着層22は、多孔基材211の上面に貼り付けられた状態で設けられている。第2粘着層22は、多孔基材211の上面のうち、カバー部材10の貼付側(-Y軸方向)の平坦面に対応する位置に貼り付けられており、多孔基材211とカバー部材10とを接着する機能を有する。
図3に示すように、電極30は、第1粘着層212の貼付側(-Z軸方向)である下面に、電極30のセンサ本体52側の一部が配線53a及び53bに接続されつつ、第1粘着層212と第4粘着層43とに挟み込まされた状態で貼り付けられている。電極30は、第1粘着層212と第4粘着層43とに挟み込まされていない部分が生体と接触する。生体センサ1が皮膚2に貼付される際に、電極30が皮膚2に接触することで、生体信号を検出することができる。生体信号は、例えば、心電波形、脳波、脈拍等を表す電気信号である。なお、電極30は、第2基材41に皮膚2と接触可能に露出した状態で埋没させてもよい。
図3に示すように、第2積層シート40は、第2基材41と、第3粘着層42と、第4粘着層43とを有している。
図3に示すように、第2基材41は、第3粘着層42の幅方向(X軸方向)の両側の外形形状は、第1積層シート20及びカバー部材10の幅方向(X軸方向)の両側の外形形状と略同一である。第2基材41の長さ(Y軸方向)は、カバー部材10及び第1積層シート20の長さ(Y軸方向)よりも短く形成されている。第2積層シート40の長手方向の両端は、センサ部50の配線53a及び53bを第2積層シート40と第1積層シート20との間に挟み込む位置であって、電極30の一部と重なる位置にある。そして、第2基材41の上面に第4粘着層43が設けられ、第1積層シート20の貼付面には第1粘着層212が設けられる。第2積層シート40の第4粘着層43と、第2積層シート40の長手方向の両端からはみ出した第1積層シート20の第1粘着層212とにより、皮膚2への貼付面が形成されている。これにより、貼付面の位置に応じて、防水性及び透湿性が相違し、粘着性が相違することになるが、生体センサ1の全体では、第1積層シート20に対応する貼付面における粘着性が皮膚2への貼付性能に大きく影響を与えることになる。
図3に示すように、第3粘着層42は、第2基材41の貼付側(-Z軸方向)の下面に設けられており、生体と接触する層である。
図4に示すように、第4粘着層43は、第2基材41のカバー部材10側(+Z軸方向)の上面に設けられており、センサ部50が接着される層である。第4粘着層43は、第3粘着層42と同様の材料を用いることができるため、詳細は省略する。なお、第4粘着層43は、必ずしも設ける必要はなく、設けなくてもよい。
図4は、センサ部50の構成を示す平面図であり、図5は、センサ部50の一部の分解斜視図である。なお、図4中の破線は、カバー部材10の外径を示す。図4及び図5に示すように、センサ部50は、生体情報を取得する各種部品が搭載されたフレキシブル基板51と、センサ本体52と、その長手方向にセンサ本体52とそれぞれ接続される配線53a及び53bと、バッテリ54と、正電極パターン55と、負電極パターン56と、導電性粘着テープ57とを有している。センサ部50のパッド部522aとパッド部522bとの間には、正電極パターン55、導電性粘着テープ57、バッテリ54、導電性粘着テープ57及び負電極パターン56が、この順にパッド部522a側からパッド部522b側にかけて積層されている。なお、本実施形態では、バッテリ54の正極端子を-Z軸方向とし、負極端子を+Z軸方向としているが、逆でもよく、正極端子を+Z軸方向とし、負極端子を-Z軸方向としてもよい。
[生体センサの作製]
(第1積層シートの作製)
矩形状に形成された多孔基材1(ポリオレフィン発泡シート(「Folec(登録商標)」、株式会社イノアックコーポレーション社製、厚さ:0.5mm)の下面に第1粘着層(長期貼付用テープ1(日東電工社製、厚さ:70μm))を形成し、貼付層を形成した。なお、長期貼付用テープ1は、その表面に、粘着剤のない粘着剤形成部分の幅が約500μm、粘着剤のない被粘着部分の幅が約1500μmとなるように形成された、波状の模様(ウェブ模様)が形成された両面粘着テープである。その後、貼付層の上面に第2粘着層(シリコーン用テープ1(「ST503(HC)60」、日東電工社製、厚さ:60μm)を形成して、第1積層シートを作製した。
(第2積層シートの作製)
矩形状に形成された基材1(PET(「PET-50-SCA1(白)」、三井物産プラスチック社製)、厚さ:38μm)の両面に第3粘着層として粘着剤1(「パーミロール」、日東電工社製)、透湿度:21(g/m2・day))を張り付けた肌用テープである第2積層シートを作製した。
(カバー部材の作製)
ベース樹脂としてPETを用いて形成した支持体にシリコーンゴムで形成されたショア硬度A40のコート層を形成して、所定の形状に成形することで、カバー部材を作製した。
(生体センサの作製)
第2積層シートの上面の中央部分にバッテリ及び制御部を備えたセンサ部を設置した。その後、第1積層シートの第1粘着層と第2積層シートとの間に挟み込んだ状態で第1粘着層の貼付面側に一対の電極を貼り付け、電極とセンサ部の配線とを接続した。その後、センサ部が第1積層シート及びカバー部材で形成される収容空間内に配置されるように、第1積層シートの上にカバー部材を積層して、生体センサを作製した。
多孔基材1の透湿度は、JIS Z 0208(防湿包装材料の透湿度試験方法(カップ法))の諸条件に準拠して測定した。多孔基材1を幅5cm×長さ5cm×厚さ0.5mmの大きさを有する試験体として、試験体の質量を測定した。その後、温度40℃、相対湿度30%の恒温恒湿環境下に24時間放置した後、試験体の質量を測定した。厚さ500μmにおける多孔基材1の透湿度は、下記式(1)の通り算出した。
多孔基材の透湿度(g/m2・day)=(放置前の質量―放置後の質量)×882.192 ・・・(1)
貼付層の特性として、貼付層の10%変形時の剪断応力、透湿度及び保水率を評価した。
(10%変形時の剪断応力)
図7に示すように、貼付層(1cm×1cm)の一方の表面に両面粘着テープ(「No.5000S」、日東電工社製)を貼り付けた後、一対のステンレス板(SUS板)で挟んだ。その後、一方のステンレス板を他方のステンレス板に平行に360mm/分の割合で、貼付層の長さが10%変形するまで(すなわち、1.1cm)引っ張り、貼付層をその長さ方向に10%変形させた時の剪断応力を測定した。
貼付層の透湿度は、上記の多孔基材1の透湿度の測定方法と同様の方法により、測定した。また、貼付層の保水率は、下記式(2)の通り求めた。
貼付層の保水率(%)=(放置前の質量―放置後の質量)/放置前の質量×100 ・・・(2)
第2積層シートの透湿度は、上述の多孔基材1の透湿度の測定方法と同様の方法により、測定した。
得られた生体センサの特性として、生体センサを長さ方向に30%変形させた時(生体センサの30%変形時)の剪断応力、貼付の安定性及び剥がれ位置を評価した。
図8に示すように、生体センサを、カバー部材、第1積層シート及び第2積層シートの積層体とし、積層体を用いて、幅1cm×長さ4cm大きさを有する試験体を作製した。試験体の接着面をステンレス板(SUS板)に固定したコラーゲン膜(「ニッピケーシング#300」、ニッピコラーゲン社製)に貼付し試験体とした。試験体をステンレス板に平行に360mm/分の割合で、試験体の長さが30%変形するまで引っ張り、その長さ方向に30%変形させた時の剪断応力を測定した。
生体センサの貼付の安定性は、複数の男性及び女性の皮膚にそれぞれ24時間貼り付けて、剥がれの有無と、そのときの剥がれ位置を観察して評価した。生体センサが複数人の男性又は女性の皮膚から1回も剥がれなかった場合には、貼付の安定性が優良であると評価(表1中、A印)し、複数人の男性又は女性の皮膚から数回剥がれた場合には、良好であると評価(表1中、B印)し、全ての男性又は女性の皮膚から剥がれた場合には、生体センサの貼付の安定性が不良であると評価(表1中、C印)した。また、剥がれ位置が、生体センサの平面視における粘着層の中央部と電極との間の領域(図9の領域A)であるか生体センサの平面視における電極の配置されている領域(図9の領域B)であるか確認した。
実施例1において、多孔基材1の厚さを変更して多孔基材1を変形した時の剪断力を変更したこと以外は、実施例1と同様にして行った。
実施例1において、多孔基材1の厚さを変更して多孔基材1を変形した時の剪断力を変更すると共に、カバー部材の種類を変更したこと以外は、実施例1と同様にして行った。
実施例1において、多孔基材1の厚さを変更し、第1積層シートの第2粘着層の種類を下記の長期貼付用テープ2に変更して、貼付層を変形した時の剪断力を変更すると共に、カバー部材の種類を変更した。それ以外は、実施例1と同様にして行った。なお、長期貼付用テープ2は、長期貼付用テープ1と同じ粘着剤で形成され、表面に波状の模様が形成されていない両面粘着テープである。
・第2粘着層:長期貼付用テープ2(日東電工社製、厚さ:60μm)
実施例1において、多孔基材1の厚さを変更し、シート層の第2粘着剤の種類を下記の長期貼付用テープ3に変更して貼付層を変形した時の剪断力を変更したこと以外は、実施例1と同様にして行った。
・第2粘着剤:長期貼付用テープ3(「SLY-25」、日東電工社製)、厚さ:25μm)
実施例1において、多孔基材1を用いないこと以外は、実施例1と同様にして行った。
実施例1において、多孔基材1を多孔基材2に変更し、第2積層シートの下面側の第1粘着層の種類を下記の長期貼付用テープ2に変更して貼付層を変形した時の剪断力を変更したこと以外は、実施例1と同様にして行った。
・多孔基材2:「ボラーラ」、積水化学工業社製)、厚さ:1mm)
・第2粘着剤:長期貼付用テープ2(「SLY-25」、日東電工社製、厚さ:35μm)
2 皮膚
10 カバー部材
20 第1積層シート(第1積層体)
21 貼付層
211 多孔基材
212 第1粘着層
22 第2粘着層
30 電極
31 貫通孔
40 第2積層シート(第2積層体)
41 第2基材
42 第3粘着層
43 第4粘着層
50 センサ部
51 フレキシブル基板(樹脂基板)
52 センサ本体
54 バッテリ
Claims (8)
- 生体に貼付して生体信号を取得する生体センサであって、
カバー部材と、
前記カバー部材の前記生体側に設けられた、多孔構造を有する多孔基材とを備え、
前記多孔基材と、前記多孔基材の前記生体側の面に設けられる第1粘着層とを有する貼付層は、前記貼付層の厚さ方向に対して直交する方向に前記貼付層の長さの5%~15%変形させた時に5×104N/m2~65×104N/m2の剪断応力を有し、
前記貼付層の透湿度が65(g/m2・day)~4000(g/m2・day)である生体センサ。 - 前記貼付層の前記カバー部材側の面に第2粘着層が設けられる請求項1に記載の生体センサ。
- 前記カバー部材の硬度が、40~70である請求項1又は2に記載の生体センサ。
- 前記多孔基材の透湿度が、100(g/m2・day)~5000(g/m2・day)である請求項1~3の何れか1項生体センサ。
- 前記生体センサは、前記生体との接触面に対して前記生体センサの全長の25%~35%変形させた時に5×104N/m2~25×104N/m2の剪断応力を有する請求項1~4の何れか1項に記載の生体センサ。
- 前記第1粘着層に貼り付けられる電極と、
前記電極に接続され、生体情報を取得するセンサ本体と、
前記センサ本体が設置される第2基材と、
を備え、
前記カバー部材は、前記生体側に凹状に形成された窪みを有し、
前記多孔基材は、前記窪みに対応する位置に貫通孔を有し、
前記窪みと前記貫通孔とにより、前記センサ本体が収容される収容空間が形成される請求項1~5の何れか1項に記載の生体センサ。 - 前記第2基材の前記生体側に設けられた第3粘着層を備え、
前記第1粘着層と第3粘着層とにより生体への貼付面が形成される請求項6に記載の生体センサ。 - 前記電極は、前記第1粘着層に貼り付けられた状態で、前記第1粘着層を露出可能な貫通孔を有する請求項6又は7に記載の生体センサ。
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US17/912,978 US20230148928A1 (en) | 2020-03-30 | 2021-03-29 | Biological sensor |
CN202180024571.7A CN115334970A (zh) | 2020-03-30 | 2021-03-29 | 生物传感器 |
EP21781736.0A EP4129662A4 (en) | 2020-03-30 | 2021-03-29 | BIOSENSOR |
CA3172283A CA3172283A1 (en) | 2020-03-30 | 2021-03-29 | Biological sensor |
AU2021245659A AU2021245659B2 (en) | 2020-03-30 | 2021-03-29 | Biosensor |
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