Stretchable device

Abstract

To provide a stretchable device capable of improving biocompatibility. [Solution] A stretchable device is provided, comprising a stretchable substrate 1 having a first main surface 11 and a second main surface 12, a stretchable wiring 2 containing resin provided on the first main surface, and a first cover layer 4 covering at least a part of the stretchable wiring, wherein the total organic carbon concentration in the extract when immersed in ultrapure water for 24 hours is 15 mg / L or less.

Description

Technical Field

[0001] The present invention relates to a stretchable device.

Background Art

[0002] Conventionally, stretchable devices that mount stretchable wiring on a stretchable substrate and are worn on the human body for use are widely known.

[0003] Patent Document 1 shows that a stretchable substrate (corresponding to a stretchable device) includes a stretchable base material, a primer layer provided on the base material, a conductor portion (corresponding to stretchable wiring) provided on the primer layer, and an overcoat layer covering the conductor portion.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Here, in the structure described in Patent Document 1, biological safety is not considered, and there is a risk of causing a decrease in biocompatibility. Along with such a decrease in biocompatibility, there is a risk of inflammation such as swelling when the stretchable device is worn on the human body.

[0006] Therefore, an object of the present invention is to provide a stretchable device capable of improving biocompatibility.

Means for Solving the Problems

[0007] In one aspect of the present invention to achieve the above object, a stretchable base material having a first main surface and a second main surface, stretchable wiring provided on the first main surface and containing resin, A first cover layer covering at least a portion of the aforementioned stretchable wiring and Equipped with, A stretchable device is provided in which the total organic carbon concentration in the extract after immersion in ultrapure water for 24 hours is 15 mg / L or less. [Effects of the Invention]

[0008] According to one aspect of the present invention, a stretchable device can improve biocompatibility. [Brief explanation of the drawing]

[0009] [Figure 1A] Figure 1A is a schematic perspective view showing a stretchable device according to the first embodiment of the present invention. [Figure 1B] Figure 1B is a cross-sectional view taken along the line IB-IB in Figure 1A. [Figure 1C] Figure 1C is a top view of Figure 1A. [Figure 2A] Figure 2A is a schematic perspective view showing a stretchable device according to a second embodiment of the present invention. [Figure 2B] Figure 2B is a cross-sectional view taken along the line IIB-IIB in Figure 2A. [Figure 2C] Figure 2C is a top view of Figure 2A. [Figure 3A] Figure 3A is a cross-sectional view of a stretchable device according to a first modified example of a second embodiment of the present invention. [Figure 3B] Figure 3B is a cross-sectional view of a stretchable device according to a first modified example of the second embodiment of the present invention. [Figure 4A] Figure 4A is a cross-sectional view of a stretchable device according to a second modified example of the second embodiment of the present invention. [Figure 4B] Figure 4B is a cross-sectional view of a stretchable device according to a second modified example of the second embodiment of the present invention. [Figure 5A] Figure 5A is a cross-sectional view of a stretchable device according to a third modified example of the second embodiment of the present invention. [Figure 5B] Figure 5B is a cross-sectional view of a stretchable device according to a third modified example of the second embodiment of the present invention. [Figure 6] FIG. 6 is a cross-sectional view of a stretchable device according to a fourth modification of the second embodiment of the present invention. [Figure 7] FIG. 7 is a partial cross-sectional view of a stretchable device according to the third embodiment of the present invention. [Figure 8] FIG. 8 is a partial cross-sectional view of a stretchable device according to a first modification of the third embodiment of the present invention. [Figure 9] FIG. 9 is a partial cross-sectional view of a stretchable device according to a second modification of the third embodiment of the present invention.

MODE FOR CARRYING OUT THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each embodiment, mainly the points different from those described before the embodiment will be described. In particular, the same operational effects due to the same configuration will not be sequentially mentioned for each embodiment. Among the components in the following embodiments, the components not described in the independent claims will be described as optional components. Also, the sizes and size ratios of the components shown in the drawings are not necessarily exact. Also, in each figure, substantially the same configuration is denoted by the same reference numeral, and duplicate explanations may be omitted or simplified.

[0011] [First Embodiment] The structure of the stretchable device 100 will be described with reference to FIGS. 1A, 1B, and 1C. FIG. 1A is a perspective view schematically showing a stretchable device according to the first embodiment. FIGS. 1B and 1C are cross-sectional views taken along line IB-IB and a top view of FIG. 1A, respectively. The cross-sectional views in this specification are cross-sections perpendicular to the stretching direction of the stretchable wiring. Also in actual comparison, it can be confirmed by the above cross-sectional views at any position where the stretchable wiring extends in one direction.

[0012] The stretchable device 100 includes a stretchable base material 1, stretchable wiring 2, and a first cover layer 4.

[0013] The arrangement of these components will be described below with reference to Figures 1B and 1C. As shown in Figures 1B and 1C, the stretchable substrate 1 has a first main surface 11 and a second main surface 12. The stretchable wiring 2 is provided on the first main surface 11 of the stretchable substrate 1 and contains resin, as will be described later. Specifically, the stretchable wiring 2 is routed on the first main surface 11 of the stretchable substrate 1. The first cover layer 4 is provided so as to cover at least a portion of the stretchable wiring 2. The statement that the first cover layer 4 covers at least a portion of the stretchable wiring 2 means that it covers the outermost surface of the stretchable wiring 2, as shown in Figure 1B.

[0014] In this specification, "top" refers to the first main surface 11 side in the thickness direction of the stretchable substrate 1, and does not necessarily coincide with the top and bottom when the stretchable device 100 is in use. The shape of the stretchable device 100 is not particularly limited. In Figure 1B, the stretching direction of the stretchable wiring 2 and the longitudinal direction of the stretchable device 100 coincide, but they do not necessarily have to coincide. Also, in Figure 1A, only wiring extending in a specific direction is shown for clarity, but the stretchable wiring 2 does not have to extend in one direction.

[0015] The stretchable substrate 1 is a sheet-like or film-like stretchable substrate, and is composed of, for example, a stretchable resin material. Examples of resin materials include thermoplastic polyurethane. The thickness of the stretchable substrate 1 is not particularly limited, but from the viewpoint of not hindering the stretching and contraction of the biological surface when attached to a living body, it is preferably 1 mm or less, more preferably 100 μm or less, and even more preferably 50 μm or less. Furthermore, the thickness of the stretchable substrate 1 is preferably 1 μm or more.

[0016] The stretchable wiring 2 contains conductive particles and a resin. Examples of the stretchable wiring 2 include a mixture consisting of metal powder such as Ag, Cu, or Ni as conductive particles and an elastomer resin such as a silicone resin. The average particle size of the conductive particles is not particularly limited, but it is preferably 0.01 μm or more and 10 μm or less. Furthermore, the shape of the conductive particles is preferably spherical.

[0017] The thickness of the stretchable wiring 2 is not particularly limited, but is preferably 100 μm or less, and more preferably 50 μm or less. Furthermore, the thickness of the stretchable wiring 2 is preferably 0.01 μm or more. The line width of the stretchable wiring 2 is not particularly limited, but is preferably 0.1 μm or more, and more preferably 10 mm or less. Furthermore, the shape and number of stretchable wiring 2 are not particularly limited.

[0018] The first cover layer 4 can be formed from an elastic resin material. For example, the first cover layer 4 can be formed from an ionomer resin, polyester resin, styrene resin, olefin resin, epoxy resin, urethane resin, acrylic resin, or silicone resin, and is preferably formed from a urethane resin. Examples of urethane resins include thermoplastic polyurethane (TPU). Examples of styrene resins include styrene-butadiene-styrene copolymer resin (SBS). The first cover layer 4 may also be composed of multiple members.

[0019] In this embodiment, the total organic carbon concentration in the extract when the stretchable device 100 (which may also be called a stretchable wiring board) is immersed in ultrapure water for 24 hours is 15 mg / L or less.

[0020] The above measurements were performed using the measurement method described later. Furthermore, all total organic carbon concentrations mentioned in this specification were measured using the same method.

[0021] Using materials such as those exemplified as stretchable wiring 2 may reduce biocompatibility and potentially cause inflammation such as skin irritation. In this embodiment, however, since the first cover layer is installed, the proportion of total organic matter exposed to the outside can be limited to below a certain level.

[0022] Furthermore, in this embodiment, since the total organic carbon concentration in the extract when the expandable device 100 is immersed in ultrapure water for 24 hours is set to 15 mg / L or less, the cytotoxicity value (colony formation rate) derived from organic substances can be kept within the predetermined standard value set by ISO.

[0023] Specifically, when the total organic carbon concentration is 15 mg / L or less, the colony formation rate measured by the ISO 10993-5 extraction-colony formation method can be increased to 70% or more, which is considered non-cytotoxic (no risk of biological adverse effects). As a result, the biocompatibility of the stretchable device according to one embodiment of the present invention can be improved.

[0024] In other words, by covering at least a portion of the stretchable wiring 2 with the first cover layer 4, leakage of toxic organic components and contact with the human body can be suppressed. It is also preferable to cover the entire stretchable wiring 2. "Entire" refers to the entire outer surface of the area that, if exposed, could come into contact with the human body. In areas where the stretchable wiring 2 is connected to electronic components or other wiring, there may be areas where the first cover layer 4 is not placed on the stretchable wiring 2.

[0025] The relationship between the total number of carbon atoms and biocompatibility is shown in Table 1. As shown in Table 1, when the total organic carbon concentration (Tt) in the extract of the stretchable device 100 was 15 mg / L or less (Examples 1-6), the cytotoxicity was 70% or more, confirming that cytotoxicity was suppressed. On the other hand, when Tt exceeded 15 mg / L (Comparative Examples 1-3), the cytotoxicity was below 70%.

[0026] Based on the above, the installation of the first cover layer can limit the proportion of total organic matter exposed to the outside to a certain level or less. Specifically, when Tt is 15 g / L or less, the cytotoxicity value (colony formation rate) derived from organic matter can be kept below the predetermined standard value set by ISO. This makes it possible to provide a highly biocompatible stretchable device.

[0027] Furthermore, it is preferable that the total organic carbon concentration (Tc) in the extract of the first cover layer 4 is 10 mg / L or less. By providing such a first cover layer 4, biocompatibility can be further improved.

[0028] By keeping Tc below 10 mg / L, it becomes easier to set the total organic carbon concentration (Tt) below 15 mg / L, and it also reduces the impact on toxicity derived from organic substances contained in the first cover layer itself.

[0029] The elastic modulus of the first cover layer 4 is preferably lower than that of the stretchable base material 1. Since the stretchable device 100 stretches and contracts during use, using a material with a high elastic modulus may cause discomfort to the human body during stretching and contraction. By making the elastic modulus of the first cover layer 4 lower than that of the stretchable base material 1, the discomfort felt by the user when using the stretchable device 100 can be reduced.

[0030] The method for measuring the elastic modulus is not particularly limited; for example, dynamic viscoelasticity measurement can be used. If the first cover layer 4 is composed of multiple members, the same measurement is performed and the average values ​​are compared.

[0031] Furthermore, it is more preferable that the elastic modulus of the first cover layer 4 be between 1.8 × 10^8 Pa and 1.0 × 10^6 Pa or more. By setting the elastic modulus of the first cover layer 4 within the above range, discomfort felt by the user can be further suppressed. More specifically, if the elastic modulus of the first cover layer 4 is too high, it may hinder expansion and contraction during use. Also, if the elastic modulus of the first cover layer 4 is too low, it may deform easily, potentially leading to leakage of organic components or unwanted deformation during use.

[0032] [Second Embodiment] The structure of the stretchable device 100 according to the second embodiment will be described with reference to Figures 2A, 2B, and 2C. Figure 2A is a schematic perspective view showing the stretchable device according to the second embodiment. Figures 2B and 2C are a cross-sectional view and a top view of line IIB-IIB in Figure 2A. Note that the cross-sectional views in this specification are cross-sections perpendicular to the extension direction of the stretchable wiring. In actual comparisons, this can also be confirmed by the above cross-sectional views at any position where the stretchable wiring extends in one direction.

[0033] The second embodiment differs from the first embodiment in that the stretchable device 100 further comprises a resin layer 3. In the second embodiment, the resin layer 3 is provided so as to be in contact with at least a portion of the stretchable wiring 2. In this case, the first cover layer 4 is provided so as to cover at least a portion of the outer main surface 10 of the stretchable wiring 2 and the resin layer 3.

[0034] In this specification, "the resin layer 3 is in contact with at least a portion of the expandable wiring 2" means that it is in contact with at least a portion of the surface of the expandable wiring 2. If the expandable wiring 2 is rectangular, as shown in Figures 2B and 2C, it is in contact with at least a portion of the top surface, bottom surface, and both side surfaces. However, the expandable wiring 2 is not limited to a rectangular shape as described above.

[0035] In this specification, "outside" refers to the side that is relatively farther from the stretchable substrate 1, and similarly does not necessarily coincide with the outside during actual use. The first cover layer 4 covering at least a portion of the outer main surface 10 of the stretchable wiring 2 and the resin layer 3 means that it covers the outermost surfaces of the stretchable wiring 2 and the resin layer 3, as shown in Figure 2B.

[0036] The arrangement of these components will be described in detail below with reference to Figures 2B and 2C. As shown in Figures 2B and 2C, a resin layer 3 is provided on the first main surface 11 of the stretchable substrate 1, and stretchable wiring 2 is provided on the resin layer 3.

[0037] By placing the resin layer 3, the intrusion of moisture into the expandable wiring 2 can be suppressed. If moisture enters the expandable wiring 2, ion migration may occur, potentially causing a short circuit in the wiring. By suppressing the intrusion of moisture into the expandable wiring 2, the reliability of the wiring can be improved.

[0038] The resin layer 3 is a resin formed by printing. More specifically, it is preferably a resin material or a mixture of a resin material and an inorganic material. Examples of resin materials include urethane, styrene, olefin, silicone, fluorine, nitrile rubber, latex rubber, vinyl chloride, ester, amide, and other elastomer resins, as well as epoxy, phenol, acrylic, polyester, imide, rosin, cellulose, polyethylene terephthalate, polyethylene naphthalate, and polycarbonate resins. The resin layer 3 does not have to be a single material.

[0039] The resin layer 3 preferably covers the upper surface of the expandable wiring 2, and more preferably covers the sides. If each surface of the expandable wiring 2 is exposed, moisture may penetrate, so covering each surface with the resin layer 3 can further suppress moisture penetration.

[0040] Furthermore, it is preferable that the resin layer 3 is placed between the stretchable substrate 1 and the stretchable wiring 2. In other words, it is preferable that the surface of the stretchable wiring 2 closest to the stretchable substrate 1 is in contact with the resin layer 3. If the stretchable wiring 2 and the stretchable substrate 1 are in contact, moisture absorbed by the stretchable substrate 1 may penetrate from the contact area. By placing the resin layer 3 between the stretchable substrate 1 and the stretchable wiring 2, the penetration of moisture into the stretchable wiring 2 can be further suppressed.

[0041] It is preferable that the resin layer 3 covers the entire first main surface 11 of the stretchable substrate. As mentioned above, when the stretchable substrate 1 and the stretchable wiring are in contact, if the stretchable substrate 1 absorbs moisture, moisture may move to the stretchable wiring 2. The resin layer 4 can suppress the intrusion of moisture from the first main surface 11.

[0042] As described above, the resin layer 3 is used to suppress the intrusion of moisture into the stretchable wiring 2. However, if materials such as those exemplified for the stretchable wiring 2 and resin layer 3 are used, biocompatibility may decrease, potentially causing inflammation such as skin irritation. In this regard, the first cover layer 4 covers at least a portion of the outer main surface 10 of the stretchable wiring 2 and resin layer 3, thereby suppressing the leakage of toxic organic components and their contact with the human body. Furthermore, it is preferable to cover the entire outer main surface 10 of the stretchable wiring 2 and resin layer 3.

[0043] Note that the resin layer 3 is not limited to the arrangement shown in Figure 2B. It may be provided so as to cover a part of the stretchable substrate 1 as shown in Figure 2B, or it may be provided only in the area that overlaps with the stretchable wiring 2 when viewed from above. Furthermore, the resin layer 3 may be provided so as to be in contact only with the side surface of the stretchable wiring 2.

[0044] Furthermore, the first cover layer 4 does not need to be in contact with the outer main surface 10 of the stretchable wiring 2 and the resin layer 3. Specifically, if the resin layer 3 is positioned only in the area overlapping the stretchable wiring, it is sufficient for it to cover the outer surface of either the stretchable wiring 2 or the resin layer 3. That is, if the stretchable wiring 2 is positioned on the upper surface of the resin layer 3, it is sufficient for only the upper surface of the stretchable wiring 2 to be covered, and if the resin layer 3 is positioned on the upper surface of the stretchable wiring 2, it is sufficient for only the upper surface of the resin layer 3 (corresponding to the outer main surface 10) to be covered. In other words, it means that the upper surfaces of the stretchable wiring 2 and the resin layer 3 are not exposed.

[0045] [First modified example of the second embodiment] Figures 3A and 3B are a partial cross-sectional view and a top view of the stretchable device 101 according to the first modified example of the second embodiment, respectively. The first modified example of the second embodiment will be described with reference to Figures 3A and 3B. The stretchable device 101 differs from the stretchable device 100 according to the second embodiment in the arrangement of the first cover layer 4.

[0046] In the width direction of the expandable wiring 2, the dimensions of the first cover layer 4 are larger than the dimensions of the resin layer 3. Specifically, it is preferable that the first cover layer 4 covers an area of ​​1 mm or more from both ends of the resin layer 3 in the width direction of the expandable wiring. Specifically, it is preferable that it covers the area indicated by the double arrow L1 in the figure.

[0047] If the dimensions of the first cover layer 4 are larger than the dimensions of the resin layer 3, it is possible to suppress the exposure of organic component-containing materials and the leakage of organic components due to displacement caused by expansion and contraction during use.

[0048] Furthermore, it is preferable that the first cover 4 covers the outer main surface 10 of the expandable wiring 2 and the resin layer 3, and a portion of the side surface continuous with the outer main surface 10, and more preferably covers the entire side surface of the resin layer 3.

[0049] By using the above configuration, leakage of organic components from the sides of the expandable wiring 2 and resin layer 3 can be suppressed.

[0050] Furthermore, it is preferable that the first cover layer 4 is in contact with the first main surface 11 of the stretchable base material 1.

[0051] As shown in Figures 3A and 3B, the first cover layer 4 covers the outer main surfaces 10 of the stretchable wiring 2 and the resin layer 3, and is in contact with the first main surface 11 of the stretchable substrate 1, thereby more reliably covering the surfaces of the stretchable wiring 2 and the resin layer 3. Furthermore, the contact between the stretchable substrate 1 and the first cover layer 4 reduces the risk of misalignment. In other words, leakage of organic components can be more reliably suppressed.

[0052] [Second modified example of the second embodiment] Figures 4A and 4B are a partial cross-sectional view and a top view of the stretchable device 102 according to a second modification of the second embodiment, respectively. The second modification of the second embodiment will be described with reference to Figures 4A and 4B. The stretchable device 102 differs from the stretchable device 100 according to the second embodiment in the arrangement of the resin layer 3.

[0053] In the width direction of the expandable wiring 2, the dimensions of the resin layer 3 are greater than or equal to the dimensions of the first main surface 11.

[0054] As shown in Figure 4A, the resin layer 3 covers the entire first main surface 11 of the stretchable substrate 1. This reduces the intrusion of moisture from the first main surface 11 of the stretchable substrate 1 and suppresses the occurrence of ion migration in the stretchable wiring 2.

[0055] While increasing the area of ​​the resin layer 3 may lead to a decrease in biocompatibility, as shown in Figures 4A and 4B, the first cover layer 4 covers the entire first main surface of the resin layer 3, thereby suppressing ion migration of the stretchable wiring 2 and providing a non-cytotoxic stretchable device 102.

[0056] [Third modified example of the second embodiment] Figures 5A and 5B are a partial cross-sectional view and a top view of the stretchable device 103 according to a third modification of the second embodiment, respectively. The third modification of the second embodiment will be described with reference to Figures 5A and 5B. The stretchable device 102 differs from the stretchable device 100 according to the second embodiment in the arrangement of the first cover layer 4.

[0057] In the width direction of the stretchable wiring 2, the dimensions of the first cover layer 4 are larger than the dimensions of the stretchable base material 1. Specifically, it is preferable that the first cover layer 4 covers an area of ​​1 mm or more from both ends of the base material 1 in the width direction of the stretchable wiring. Specifically, it is preferable that the area indicated by the double arrow L2 in the figure is 1 mm or more.

[0058] By adopting the above configuration, the leakage of organic components due to displacement during expansion and contraction during use can be suppressed, making it easier to keep cytotoxicity values ​​(colony formation rates) within the prescribed standards set by ISO. This enables further improvement in biocompatibility.

[0059] As mentioned above, the stretchable wiring 2 and the resin layer 3 contain cytotoxic organic components, and similarly, the stretchable substrate 1 may also contain cytotoxic organic components.

[0060] In other words, the first cover layer 4 covers the stretchable substrate 1, thereby suppressing the leakage of organic components from the stretchable substrate 1.

[0061] Furthermore, it is preferable that the first cover layer 4 covers the first main surface 11 of the stretchable substrate 1 and the side surface continuous with the first main surface 11, and more preferably covers the entire side surface continuous with the first main surface 11.

[0062] As shown in Figure 5A, by covering the first main surface and the side surface connecting the first main surface 11 and the second main surface 12, leakage of organic components from the side surface of the stretchable substrate 1 can be suppressed.

[0063] Furthermore, the thickness of the first cover layer 4 is preferably 40 μm or more.

[0064] As shown in Comparative Example 3 in Table 1, if the thickness of the first cover layer 4 is thin, cytotoxic organic components are more likely to leak out. By making the thickness of the first cover layer 40 μm or more, the leakage of organic components can be suppressed.

[0065] It is even more preferable that the thickness of the first cover layer 4 is 50 μm or more.

[0066] Furthermore, by increasing the thickness of the first cover layer, specifically to 50 μm or more, the leakage of organic components can be suppressed more reliably.

[0067] Furthermore, the thickness of the first cover layer 4 is preferably 200 μm or less. As mentioned above, increasing the thickness of the first cover layer 4 can suppress the leakage of organic components. On the other hand, increasing the thickness of the first cover layer reduces its stretchability, which may increase the likelihood of causing discomfort during use.

[0068] By making the thickness of the first cover layer 4 between 40 μm and 200 μm, the leakage of organic components can be suppressed, and the possibility of causing discomfort during use can be reduced.

[0069] Furthermore, if there are areas with different widths or thicknesses as described above, the average value shall be used as the thickness of the first cover layer. These values ​​can be measured using a dial gauge or similar device as specified in JIS B 7503.

[0070] [Fourth modified example of the second embodiment] Figure 6 is a partial cross-sectional view of the stretchable device 104 according to the fourth modification of the second embodiment. The fourth modification of the second embodiment will be described with reference to Figure 6. The stretchable device 104 differs from the stretchable device 100 according to the second embodiment in the arrangement of the resin layer 3 and the configuration of the first cover layer 4.

[0071] As shown in Figure 6, the resin layer 3 may cover the top and sides of the stretchable wiring 2. Furthermore, as mentioned above, it may also include a region positioned between the stretchable wiring 2 and the stretchable substrate 3.

[0072] In this way, by arranging the resin layer 3, each surface of the stretchable wiring 2 is covered, and ion migration of the stretchable wiring 2 can be suppressed more reliably.

[0073] The thickness of the resin layer 3 in the region that overlaps with the stretchable wiring 2 is smaller than the thickness of the resin layer 3 in the region that does not overlap with the stretchable wiring 2.

[0074] Specifically, the dimension of the double-headed arrow t1 shown in Figure 6 is larger than the dimension of the double-headed arrow t2. By providing a resin layer in this way, the region that overlaps with the expandable wiring 2 and the region that does not overlap with the expandable wiring 2 can be flattened.

[0075] As shown in Figures 2B, 3A, 4A, and 5A, when the resin layer 3 is formed with a constant thickness, a difference in thickness occurs between the area overlapping with the stretchable wiring 2 and the area not overlapping with the stretchable wiring 2. This difference in thickness may cause discomfort during use. Furthermore, the stretchability will also differ, which may lead to breakage starting points during stretching.

[0076] As shown in Figures 2B, 3A, 4A, and 5A, the overall flattening can be achieved by changing the thickness of the first cover layer 4, however, it may be difficult to change the thickness depending on the material constituting the first cover layer 4. In other words, by arranging the resin layer 3 as described above, ion migration of the stretchable wiring 2 can be reliably suppressed, and the stretchable device 104 can be flattened without limiting the material of the first cover layer.

[0077] Furthermore, it is preferable that the side of the first cover layer 4 closest to the stretchable substrate 1 has adhesive properties.

[0078] The surface of the first cover layer 4 closest to the stretchable substrate 1 is the surface that comes into contact with the stretchable substrate 1, the stretchable wiring 2, and the resin layer 3. It is also the innermost main surface of the first cover layer 4.

[0079] As mentioned earlier, stretchable devices are at risk of displacement due to stretching during use. The first cover layer 4 has adhesive properties in the areas that come into contact with the stretchable substrate 1, stretchable wiring 2, and resin layer 3, thereby reducing the risk of displacement and suppressing the leakage of organic components that may occur as a result.

[0080] If the first cover layer 4 is composed of multiple members as an adhesive structure, the adhesive layer may be applied to the member closest to the stretchable base material 1, or the first cover layer 4 may be composed of a single adhesive member. Alternatively, the first cover layer 4 may be composed of members that do not have adhesive properties, and the adhesive may be applied to the surface of the first cover layer 4 that is closest to the stretchable base material 1.

[0081] The adhesive layer and adhesive can be used without particular limitations, as long as they can be laminated onto a general stretchable substrate. Examples of adhesive layers include reactive adhesives such as epoxy resin adhesives, silicone adhesives, and urethane adhesives, as well as melt-solidifying adhesives such as acrylic resin adhesives and synthetic rubber adhesives.

[0082] Furthermore, it is even more preferable that the surface of the first cover layer 4 closest to the stretchable substrate 1 is adhesive. This can be achieved by using the adhesive as a bonding agent or the adhesive layer as an adhesive layer in the aforementioned adhesive structure. Because the bonding agent and adhesive layer have high connection reliability, it is possible to prevent deterioration of the substrate by using excessive heat or UV energy to react after grounding required by the bonding agent and adhesive layer. Specifically, examples of adhesives include pressure-sensitive adhesives such as rubber-based, acrylic-based, and silicone-based adhesives. Figure 6 illustrates an example in which the first adhesive layer 6 is newly provided.

[0083] By using the above configuration, the risk of misalignment can be further reduced, and the resulting leakage of organic components can be suppressed.

[0084] [Third Embodiment] Figure 7 is a partial cross-sectional view of the stretchable device 105 according to the third embodiment. The third embodiment will be described with reference to Figure 7. The stretchable device 105 differs from the stretchable device 100 according to the second embodiment in that it includes a second cover layer 5.

[0085] The stretchable device 105 further comprises a second cover layer 5 that covers the second main surface 12 of the stretchable substrate 1.

[0086] As mentioned above, the stretchable substrate 1 also contains organic components. Therefore, if the second main surface 12 is exposed, there is a risk of organic components leaking out. By covering it with the second cover layer 5, the exposed portion of the second main surface 12 is reduced, thereby suppressing the leakage of organic components from the second main surface 12 side of the stretchable substrate 1.

[0087] Similar to the first cover layer 4, it is preferable that the dimensions of the second cover layer 5 are larger than the dimensions of the second main surface 12 in the width direction of the expandable wiring 2.

[0088] Furthermore, it is preferable that the second cover layer 5 covers the side surface connecting the first main surface 11 and the second main surface. It is preferable that this side surface is covered by at least one of the first cover layer 4 and the second cover layer 5.

[0089] The effects of the above configuration are the same as those of the first cover layer 4, so they will be omitted.

[0090] The second cover layer 5 may be formed from an elastic resin material. For example, the first cover layer 4 may be formed from an ionomer resin, polyester resin, styrene resin, olefin resin, epoxy resin, urethane resin, acrylic resin, or silicone resin, preferably from a urethane resin. Examples of urethane resins include thermoplastic polyurethane (TPU). Examples of styrene resins include styrene-butadiene-styrene copolymer resin (SBS). The second cover layer 5 may also be composed of multiple components. Furthermore, the second cover layer 5 may be made of the same material as the first cover layer 4, or it may be made of a different material.

[0091] By using the same material for the first cover layer 4 and the second cover layer 5, they expand and contract equally during expansion and contraction, thereby increasing the reliability of the connection between the first cover layer 4 and the second cover layer 5. Furthermore, using the same material simplifies the manufacturing process. However, the first cover layer 4 and the second cover layer 5 may be made of different materials. By selecting materials suitable for the first cover layer 4 and the second cover layer 5, the bonding strength of each layer can be optimized.

[0092] Furthermore, similar to the first cover layer 4, it is preferable that the total organic carbon concentration in the extract of the second cover layer 5 be 10 mg / L or less. In addition, it is preferable that the elastic modulus of the second cover layer 5 be lower than that of the stretchable substrate 1, and more preferably 1.0 × 10^8 Pa or less and 1.0 × 10^6 or more.

[0093] Furthermore, the thickness of the second cover layer 5 is preferably 40 μm or more, and more preferably 50 μm or more. Similarly, the thickness of the second cover layer is more preferably 200 μm or less.

[0094] The effects of the above configuration are the same as those of the first cover layer 4, so they will be omitted.

[0095] Furthermore, if the stretchable device includes a second cover layer 5, it is preferable that the sum of the thicknesses of the first cover layer 4 and the second cover layer 5 be between 80 μm and 400 μm. By arranging the first cover layer 4 and the second cover layer 5 as described above, leakage of organic components can be suppressed and discomfort during use can be reduced.

[0096] Furthermore, in Figure 7, the dimensions of the first cover layer 4 and the second cover layer 5 in the width direction of the expandable wiring 2 are the same, but they may be different. Also, as shown in Figure 7, the thickness of the first cover layer 4 and the thickness of the second cover layer 5 may be different or the same, as shown in Figure 7.

[0097] [First modified example of the third embodiment] Figure 8 is a partial cross-sectional view of the stretchable device 106 according to the first modified example of the third embodiment. The first modified example of the third embodiment will be described with reference to Figure 8. The stretchable device 106 differs from the stretchable device 105 according to the third embodiment in that it includes a second adhesive layer 7.

[0098] It is preferable that the side of the second cover layer 5 closest to the stretchable substrate has adhesive properties.

[0099] Of the second cover layer 5, the surface closest to the stretchable base material 1 is the innermost main surface facing the second main surface of the stretchable base material 1. In this embodiment, this is the surface that contacts the second main surface of the stretchable base material 1. Furthermore, if the stretchable wiring 2 and resin layer 3 are provided on the second main surface 12, the surface of the second cover layer 5 closest to the stretchable base material 1 is also the surface that contacts the stretchable wiring 2 and resin layer 3.

[0100] If the second cover layer 5 is composed of multiple members as an adhesive structure, the adhesive layer may be applied to the member closest to the stretchable base material 1, or the second cover layer 5 may be composed of a single adhesive member. Alternatively, the second cover layer 5 may be composed of members that do not have adhesive properties, and the adhesive may be applied to the surface of the second cover layer 5 that is closest to the stretchable base material 1.

[0101] The adhesive layer and adhesive can be any type that can be laminated onto a general stretchable substrate, and are not particularly limited. Examples of adhesive layers include reactive adhesives such as epoxy resin adhesives, silicone adhesives, and urethane adhesives, as well as melt-solidifying adhesives such as acrylic resin adhesives and synthetic rubber adhesives. Other examples include pressure-sensitive adhesives such as rubber-based, acrylic-based, and silicone-based adhesives. Figure 8 illustrates an example in which a second adhesive layer 7 is newly provided.

[0102] If the first cover layer 4 is composed of multiple members as an adhesive structure, the adhesive layer may be applied to the member closest to the stretchable base material 1, or the first cover layer 4 may be composed of a single adhesive member. Alternatively, the first cover layer 4 may be composed of members that do not have adhesive properties, and the adhesive may be applied to the surface of the first cover layer 4 that is closest to the stretchable base material 1.

[0103] Furthermore, it is even more preferable that the side of the second cover layer 5 closest to the stretchable substrate 1 is adhesive. This can be achieved by using the adhesive as the adhesive agent or the adhesive layer as the adhesive layer in the aforementioned adhesive structure. Because the adhesive agent and adhesive layer have high connection reliability, it is possible to prevent deterioration of the substrate by using excessive heat or UV energy to react after grounding required by the adhesive agent and adhesive layer. Specifically, examples of pressure-sensitive adhesives include rubber-based, acrylic-based, and silicone-based adhesives.

[0104] As mentioned above, the first cover layer 4 and the second cover layer 5 may be composed of different materials, and therefore it goes without saying that the structures for providing adhesiveness may also be different.

[0105] The adhesive properties of the second cover layer on the side closest to the stretchable substrate 1 enhance the reliability of the connection between the second cover layer 5 and the second main surface 12, thereby suppressing leakage of organic components due to misalignment.

[0106] Furthermore, since the arrangement of the first and second adhesive layers changes depending on the arrangement of the stretchable wiring 2 and the resin layer 3, the first adhesive layer 6 and the second adhesive layer 7 do not need to have the same shape as shown in Figure 8. The same applies when other methods for achieving adhesiveness are employed.

[0107] [Second modified example of the third embodiment] Figure 9 is a partial cross-sectional view of the stretchable device 107 according to a second modification of the third embodiment. The second modification of the third embodiment will be described with reference to Figure 9. The stretchable device 107 differs from the stretchable device 105 according to the third embodiment in the arrangement of the first cover layer 4 and the second cover layer 5.

[0108] Specifically, it is preferable that the first cover layer 4 and the second cover layer 5 are in contact with the stretchable substrate 1 in a region that does not overlap with it.

[0109] In the width direction of the expandable wiring 2, the dimensions of the second cover layer 5 are preferably larger than the dimensions of the second main surface 12, and it is preferable that it covers an area of ​​1 mm or more from the end of the first main surface 2 in the width direction of the expandable wiring 2. Similar to the first cover layer 4, by arranging it as described above, leakage of organic components due to displacement caused by expansion and contraction during use can be suppressed.

[0110] In the width direction of the expandable wiring 2, when the dimensions of the first cover layer 4 are greater than the dimensions of the first main surface 11 and the dimensions of the second cover layer 5 are greater than the dimensions of the second main surface 12, both the first cover layer 4 and the second cover layer 5 will protrude from the expandable substrate 1, thus allowing the first cover layer 4 and the second cover layer 5 to come into contact. With such a structure, even if the expandable substrate 1 is displaced, the movement of the expandable substrate 1 is suppressed at the connection point between the first cover layer 4 and the second cover layer 5. Furthermore, the sides of the expandable substrate 1, expandable wiring 2, and resin layer 3 can be covered more reliably. In other words, leakage of organic components can be suppressed more reliably.

[0111] Furthermore, it is even more preferable that the innermost main surface of the first cover layer 4 having adhesive properties and the innermost main surface of the second cover layer having adhesive properties are in contact with the stretchable substrate 1 in a region that does not overlap with it.

[0112] In other words, it is preferable that the connection between the first cover layer 4 and the second cover layer 5, as described above, is a connection between surfaces that have adhesive properties.

[0113] Figure 9 illustrates an example in which the first and second cover layers are adhesive, similar to the embodiments described above, by having a first adhesive layer and a second adhesive layer. As mentioned above, the configuration in which the first cover layer 4 and the second cover layer 5 are adhesive is not limited to the configuration shown in Figure 9.

[0114] Furthermore, in Figure 9, the contact portion between the first cover layer 4 and the second cover layer 5 is shown as 8. As shown in Figure 9, it is preferable that the contact portion is the contact between two adhesive surfaces.

[0115] Because the adhesive layers are connected to each other, the possibility of displacement during expansion and contraction can be greatly reduced. In other words, leakage of organic components can be suppressed.

[0116] Furthermore, it is preferable that there are multiple contact points between the first cover layer 4 and the second cover layer 5, and that the stretchable base material 1 is positioned between these multiple contact points in the width direction of the stretchable wiring 2.

[0117] With the above configuration, when viewed in a cross-section perpendicular to the stretching direction of the stretchable wiring, the stretchable substrate 1 containing organic components, the stretchable wiring 2, and the resin layer 3 are completely sealed around by the first cover layer 4 and the second cover layer 5.

[0118] In other words, leakage of organic components can be significantly suppressed. The first cover layer and the second cover layer 5 may be shaped to conform to the stretchable base material 1, the stretchable wiring 2, and the resin layer 3, or they may have a gap 9 between them and the member containing the organic component, as shown in Figure 9.

[0119] Furthermore, it is preferable that a plurality of stretchable wirings 2 are provided on the first main surface 11 of the stretchable base material 1, separated from and facing each other, and that a resin layer 3 is placed between adjacent stretchable wirings 2.

[0120] Ion migration caused by moisture intrusion occurs between multiple stretchable wirings 2 with different potentials. As shown in Figure 9, by providing a resin layer 3 between multiple stretchable wirings in the width direction of the stretchable wiring 2, moisture intrusion can be suppressed and the possibility of ion migration can be reduced. In addition, it becomes easier to ensure the overall flatness of the resin layer 3. [Examples]

[0121] The following describes some examples.

[0122] (1) Sample preparation (Examples 1-8, Comparative Examples 1-4) Examples 1-8 and Comparative Examples 1-4 are samples of the aforementioned stretchable device with variations in the configuration of the first and second cover layers, or with differences in the presence or absence of cover layers. The configuration of each first and second cover layer is shown in the lower four rows of Table 1 below. Comparative Examples 1 and 4 are samples without the first and second cover layers. The thickness of the first and second cover layers is the average value of the dimensions of the first and second cover layers in the thickness direction of the stretchable substrate 1. The presence or absence of adhesive indicates whether the innermost main surfaces of the first and second cover layers have adhesive properties. In this example, the presence or absence of adhesive properties is changed by placing an adhesive. The width of the first and second cover layers is a comparison of the dimensions of the stretchable substrate 1, resin layer 3, and first cover layer 4 in the width direction of the stretchable wiring 2. In Table 1, the stretchable substrate width listed alone indicates that the dimensions of the first cover layer 4 and second cover layer 5 are approximately the same as the width dimension of the stretchable substrate. In Table 1, the resin layer width indicates that the dimensions of resin layer 3, the first cover layer 4, and the second cover layer 5 are approximately the same; resin layer width + 1 indicates that the first cover layer 4 and the second cover layer 5 protrude 1 mm from the end of resin layer 3 in the width direction; and stretchable substrate width + 1 indicates that the dimensions of the first cover layer 4 and the second cover layer 5 protrude 1 mm beyond the width of stretchable substrate 1. The elastic modulus was measured using viscoelasticity testing, and the storage modulus at 30°C was measured. The components are shown as the main components of each cover layer. Note that in Examples 7 and 8, no resin layer is provided.

[0123] (2) Sample measurement method • Extraction solvent: Ultrapure water *TOC value of ultrapure water alone = 0.1 mg / L (limit of quantification) or less • Extraction conditions: Leave standing for 24 hours at 23°C. • Extraction procedure: 40cc of ultrapure water and sheet-like samples of each level, each measuring 50mm x 50mm, were placed in an extraction vessel and allowed to stand for 24 hours at 23°C to obtain the extracted solution. • Test procedure: For each sample, the concentration of total organic carbon (TOC) (C mg / L) was calculated using the combustion oxidation-infrared TOC analysis method in accordance with section 22.1 of JIS K0102, using a Shimadzu Corporation TOC-VCSH (Total Organic Carbon Meter (TOC Meter)) instrument conforming to JIS K0805.

[0124] (3) Measurement results (Examples 1-8, Comparative Examples 1-4) The measurement results are shown in the top four rows of Table 1 below. Tt (Total TOC) (mg / L) is the result of measuring the stretchable device of each example and modification using the measurement method described above. Tc (TOC Cover Only) (mg / L) is the result of measuring only the first cover layer 4 in each example using the measurement method described above. Colony formation rate (%) is the result of measuring the colony formation rate according to ISO 10993-5 Annex. Toxicity was evaluated by classifying samples with a colony formation rate of 70% or more as non-toxic and samples with a colony formation rate of less than 70% as toxic.

[0125] [Table 1] TIFF2026083052000002.tif25077

[0126] The results from Comparative Examples 1 and 4 confirm that samples without the first cover layer exhibit cytotoxicity. Furthermore, Comparative Examples 2 and 3 confirm that samples with a sufficiently large Tt (total TOC) (mg / L) exhibit cytotoxicity. Comparing Example 3 with Comparative Example 3, it can be confirmed that by setting Tt (total TOC) (mg / L) to 15 mg / L, the sample does not exhibit cytotoxicity, i.e., it is a highly biocompatible stretchable device.

[0127] Next, we will compare each example. Example 1 and Example 2 differ in their elastic modulus. It can be confirmed that the colony formation rate increases when the elastic modulus is set to 1.8 × 10^8 Pa or less. Since cytotoxicity is determined by the colony formation rate, the higher the colony formation rate, the higher the biocompatibility.

[0128] Examples 1-3 differ in the composition of the components. As shown in Examples 3-6, an elastomer film such as urethane with a laminated adhesive layer can be selected as the main component of the first cover layer 4. Compared to cases where the film itself is bonded by melting or reaction, such as with thermoplastic resins or thermosetting resins, selecting an elastomer film such as urethane or styrene with a laminated adhesive layer and performing a pressure bonding treatment at room temperature can suppress deterioration due to heat and UV irradiation. Note that the first cover layer 4 may also include other components such as an adhesive layer in addition to the elastomer film. Furthermore, it is preferable that the elastomer film is the component of the first cover layer 4 furthest from the first substrate. Examples 2 and 3-6 differ in the presence or absence of an adhesive layer. As shown in Examples 3-6, an elastomer film such as urethane with a laminated adhesive layer can be selected as the main component of the first cover layer 4. Compared to a single layer of film with an adhesive mechanism such as a thermoplastic resin, selecting a laminate of urethane with an adhesive layer can suppress deterioration due to heat and deformation.

[0129] Examples 3 and 4 differ in the thickness of the first cover layer 4 and the second cover layer 5. It can be confirmed that the colony formation rate is improved by setting the thickness of the first cover layer 4 and the second cover layer 5 to 55 micrometers.

[0130] The difference between Example 4 and Example 5 is whether or not the first cover layer 4 and the second cover layer 5 protrude from the resin layer 3. It can be confirmed that the colony formation rate is improved by arranging the first cover layer 4 and the second cover layer 5 to protrude from the resin layer 3, as in Example 5.

[0131] The difference between Example 5 and Example 6 is whether or not the first cover layer 4 and the second cover layer 5 protrude from the stretchable substrate 1. It can be confirmed that the colony formation rate is improved by arranging the first cover layer 4 and the second cover layer 5 to protrude from the stretchable substrate 1, as in Example 6.

[0132] Furthermore, from Examples 2, 7, and 8, it can be confirmed that when the component of the cover layer is styrene, the colony formation rate exceeds 90% compared to when the component is olefin or urethane. Moreover, it can be confirmed that when the component of the cover layer is styrene and the width of the cover layer is the width of the stretchable substrate, Tt is less than 7.0.

[0133] Note that the components other than the first cover layer are the same as those in the second modified example of the third embodiment, excluding the first cover layer 4 and the second cover layer 5. The effects are also the same, so a description will be omitted.

[0134] (4) Overall consideration As shown in Table 1, the biocompatibility of the stretchable device can be improved by keeping Tt (total TOC) (mg / L) below 15 mg / L. Furthermore, by covering the stretchable wiring 2 of each sample with a resin layer 3, moisture intrusion can be prevented and the occurrence of short circuits due to ion migration can be suppressed. In other words, it is possible to provide a stretchable device that suppresses short circuits in the stretchable wiring and has improved biocompatibility.

[0135] Furthermore, the embodiments and modifications shown are illustrative, and the present invention is not limited to these embodiments and modifications. Also, the drawings are illustrative of the components and do not limit their shape. Additionally, partial substitution or combination of the configurations shown in different embodiments and modifications is possible.

[0136] The present invention may take the following forms. <1> A stretchable substrate having a first main surface and a second main surface, Provided on the first main surface, an expandable wiring containing resin, A first cover layer covering at least a portion of the aforementioned stretchable wiring and Equipped with, A stretchable device in which the total organic carbon concentration in the extract after immersion in ultrapure water for 24 hours is 15 mg / L or less. <2> The resin layer further comprises contact with at least a portion of the aforementioned expandable wiring. <1> The stretchable device described. <3> The first cover layer further covers at least a portion of the outer main surface of the resin layer. <2> The stretchable device described. <4> The total organic carbon concentration in the extract obtained by immersing the first cover layer in ultrapure water for 24 hours is 10 mg / L or less. <1> ~ <3> A stretchable device as described in any of the following. <5> The elastic modulus of the first cover layer is smaller than the elastic modulus of the stretchable substrate. <1> from <4> A stretchable device as described in any one of the following. <6> In the width direction of the stretchable wiring, the dimensions of the first cover layer are larger than the dimensions of the resin layer. <2> from <5> A stretchable device as described in any one of the following. <7> The first cover layer covers the outer main surface and the side surface continuous with the outer main surface of the resin layer. <2> from <5> A stretchable device as described in any one of the following. <8> The first cover layer is in contact with the first main surface of the stretchable substrate. <7> The stretchable device described. <9> In the width direction of the aforementioned expandable wiring, the dimensions of the resin layer are greater than or equal to the dimensions of the first main surface. <2> from <8> A stretchable device as described in any one of the following. <10> In the width direction of the stretchable wiring, the dimensions of the first cover layer are larger than the dimensions of the stretchable substrate. <1> from <9> A stretchable device as described in any one of the following. <11> The first cover layer covers the first main surface of the stretchable substrate and the side surface of the stretchable substrate that is continuous with the first main surface. <10> The stretchable device described. <12> The thickness of the first cover layer is 40 μm or more. <1> from <11> A stretchable device as described in any one of the following. <13> The thickness of the portion of the resin layer that overlaps with the stretchable wiring is smaller than the thickness of the portion of the resin layer that does not overlap with the stretchable wiring. <2> from <12> A stretchable device as described in any one of the following. <14> Of the first cover layer, the surface closest to the stretchable substrate has adhesive properties. <1> from <13> A stretchable device as described in any one of the following. <15> Furthermore, the stretchable substrate is provided with a second cover layer that covers the second main surface, <1> from <14> A stretchable device as described in any one of the following. <16> The first cover layer and the second cover layer are in contact with the stretchable substrate in a region that does not overlap with it. <15> The stretchable device described <17> Of the second cover layer, the surface closest to the stretchable substrate has adhesive properties. <15> or <16> The stretchable device described. <18> Of the first cover layer, the surface closest to the stretchable substrate is adhesive. The adhesive surface of the first cover layer closest to the stretchable substrate and the adhesive surface of the second cover layer closest to the stretchable substrate are in contact in a region that does not overlap with the stretchable substrate. <17> The stretchable device described. <19> Multiple contact points exist between the first cover layer and the second cover layer, The stretchable base material is positioned between the plurality of contact portions in the width direction of the stretchable wiring. <18> The stretchable device described. <20> A plurality of the stretchable wirings are provided on the first main surface of the stretchable substrate, separated from each other and facing each other, and the resin layer is disposed between one adjacent stretchable wiring and the other stretchable wiring. <2> from <19> A stretchable device as described in any one of the following. [Industrial applicability]

[0137] The stretchable device of the present invention can be worn on the human body. (See related applications for cross-reference)

[0138] This application claims priority under the Paris Convention based on Japanese Patent Application No. 2022-021939 (filing date: February 16, 2022, title of invention: "Stretchable Device"). All contents disclosed in said application are incorporated herein by reference. [Explanation of Symbols]

[0139] 1: Stretchable base material 2:Stretchable wiring 3: Resin layer 4: First Cover Layer 5: Second Cover Layer 6: 1st adhesive layer 7:Second adhesive layer 8: Contact part 9:Void 10: Outer main surface 11: First main surface 12: Second main surface 100, 101, 102, 103, 104, 105, 106, 107: Stretchable devices

Claims

1. A stretchable substrate having a first main surface and a second main surface, Provided on the first main surface, a stretchable wiring containing resin, A first cover layer covering at least a portion of the aforementioned expandable wiring and Equipped with, A stretchable device in which the total organic carbon concentration in the extract after immersion in ultrapure water for 24 hours is 15 mg / L or less.

2. The stretchable device according to claim 1, further comprising a resin layer in contact with at least a portion of the stretchable wiring.

3. The stretchable device according to claim 2, wherein the first cover layer further covers at least a portion of the outer main surface of the resin layer.

4. The expandable device according to any one of claims 1 to 3, wherein the total organic carbon concentration in the extract obtained by immersing the first cover layer in ultrapure water for 24 hours is 10 mg / L or less.

5. The stretchable device according to any one of claims 1 to 4, wherein the elastic modulus of the first cover layer is smaller than the elastic modulus of the stretchable substrate.

6. The stretchable device according to any one of claims 2 to 5, wherein in the width direction of the stretchable wiring, the dimensions of the first cover layer are greater than the dimensions of the resin layer.

7. The stretchable device according to any one of claims 2 to 5, wherein the first cover layer covers the outer main surface and the side surface continuous with the outer main surface of the resin layer.

8. The stretchable device according to claim 7, wherein the first cover layer is in contact with the first main surface of the stretchable substrate.

9. The expandable device according to any one of claims 2 to 8, wherein in the width direction of the expandable wiring, the dimensions of the resin layer are greater than or equal to the dimensions of the first main surface.

10. The stretchable device according to any one of claims 1 to 9, wherein in the width direction of the stretchable wiring, the dimensions of the first cover layer are greater than the dimensions of the stretchable substrate.

11. The stretchable device according to claim 10, wherein the first cover layer covers the first main surface of the stretchable substrate and the side surface of the stretchable substrate that is continuous with the first main surface.

12. The stretchable device according to any one of claims 1 to 11, wherein the thickness of the first cover layer is 40 μm or more.

13. The stretchable device according to any one of claims 2 to 12, wherein the thickness of the region of the resin layer that overlaps with the stretchable wiring is smaller than the thickness of the region of the resin layer that does not overlap with the stretchable wiring.

14. The stretchable device according to any one of claims 1 to 13, wherein the surface of the first cover layer closest to the stretchable substrate is adhesive.

15. Furthermore, the stretchable device according to any one of claims 1 to 14, comprising a second cover layer covering the second main surface of the stretchable substrate.

16. The stretchable device according to claim 15, wherein the first cover layer and the second cover layer are in contact with the stretchable substrate in a region that does not overlap with it.

17. The stretchable device according to claim 15 or 16, wherein the surface of the second cover layer closest to the stretchable substrate is adhesive.

18. Of the first cover layer, the surface closest to the stretchable substrate is adhesive. The stretchable device according to claim 17, wherein the adhesive surface of the first cover layer closest to the stretchable substrate and the adhesive surface of the second cover layer closest to the stretchable substrate are in contact in a region that does not overlap with the stretchable substrate.

19. Multiple contact points exist between the first cover layer and the second cover layer, The stretchable base material is arranged between the plurality of contact portions in the width direction of the stretchable wiring, as described in claim 18.

20. The stretchable device according to any one of claims 2 to 19, wherein a plurality of stretchable wirings are provided on the first main surface of the stretchable substrate, separated from each other and facing each other, and the resin layer is disposed between one adjacent stretchable wiring and the other stretchable wiring.

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