Gel sheet
An object of the present invention is to provide a gel sheet comprising an intermediate base, having no variation in adhesiveness. A gel sheet 1 comprising a gel material 10 and an intermediate base 20 embedded in the gel material 10 , wherein when T represents the thickness of the gel sheet 1 , and S represents the amplitude of the intermediate base 20 , a relation represented by the following expression (1) is satisfied: S/T ≤0.4 (1)
1. A gel sheet comprising a gel material and an intermediate base embedded in the gel material, and satisfying the following expression (1):
S/T≤ 0.4 (1)
wherein T represents a thickness of the gel sheet, and S represents an amplitude of the intermediate base,
wherein the gel material comprises at least two gel sheet layers having a gel sheet layer A and a gel sheet layer B alternately stacked, wherein
the gel sheet layer A comprises at least one inorganic salt at a total content of X wt % relative to the total weight of the gel sheet layer A; and the gel sheet layer B comprises at least one inorganic salt at a total content of Y wt % relative to the total weight of the gel sheet layer B, wherein Y is less than X; and
the gel sheet layer B comprises at least one acid.
2. The gel sheet according to claim 1 , wherein the at least one acid comprises an organic acid.
3. The gel sheet according to claim 1 , wherein X and Y satisfy the following expression (3):
0≤ Y<X≤ 15 (3).
4. The gel sheet according to claim 1 , wherein when the gel sheet layer B has a water content of a wt % relative to the total weight of the gel sheet layer B, Y and α satisfy the following expression (4):
0≤ Y/α≤ 0.03 (4).
5. The gel sheet according to claim 1 , wherein when the gel sheet layer A has a thickness of a (mm), and the gel sheet layer B has a thickness of b (mm), a and b satisfy the following expressions (5) and (6):
b/a≥ 1 (5)
0.6≤ a+b≤ 3.0 (6).
6. An electrode pad comprising the gel sheet according to claim 1 and an electrode electrically connected to the gel sheet layer A or the gel sheet layer B of the gel sheet.
7. An electrode pad for use on a living body, comprising the gel sheet according to claim 1 and an electrode electrically connected to the gel sheet layer A or the gel sheet layer B of the gel sheet, wherein the gel sheet layer A or the gel sheet layer B not connected to the electrode of the gel sheet is used as a part in contact with a living body.
8. An electrotherapeutic equipment for use on a living body, comprising the electrode pad for use on a living body according to claim 7 and a power supply part electrically connected to the electrode of the electrode pad for use on a living body, wherein the gel sheet layer A of the electrode pad for use on a living body is disposed adjacent to the positive electrode, and the gel sheet layer B is disposed adjacent to the negative electrode.
9. The electrotherapeutic equipment for use on a living body according to claim 8 , for application of direct current.
10. The electrode pad for use on a living body according to claim 7 , for application of direct current.