Sensor sheet
Provided is a sensor sheet 100 comprising: a lower sheet 110 that is affixed to the skin of a subject; an upper sheet 120 that is affixed to the surface side of the lower sheet 110; and an electric circuit section 130 provided to an area corresponding to the upper sheet 120. A peripheral edge section 110 a has a single-layer structure comprising only the lower sheet 110. A central area has a multilayer structure comprising the lower sheet 110 and the upper sheet 120. In this way, the ability to conform to the skin is enhanced in the peripheral edge section 110 a of the sheet where itching is likely to occur, the electric circuit section 130 can be held firmly in the central area.
1. A sensor sheet for biological information measurement, the sensor sheet comprising:
a first adhesive sheet to be applied to a skin of a subject;
a second adhesive sheet to be stuck to a front surface side of the first adhesive sheet; and
an electric circuit comprising a plurality of electrodes and wires connected to the plurality of electrodes, the electric circuit provided in an area in the second adhesive sheet, wherein,
the second adhesive sheet is thicker than the first adhesive sheet,
the first adhesive sheet is higher in stretchability than the second adhesive sheet,-and
the stretchability of a peripheral edge area of the second adhesive sheet is higher than that of a center area of the second adhesive sheet, and
the sensor sheet further comprising slits formed in the peripheral edge area of the second adhesive sheet.
2. The sensor sheet according to claim 1 , wherein the second adhesive sheet is smaller in area than the first adhesive sheet, and is stuck to a center area of the first adhesive sheet except a peripheral edge area of the first adhesive sheet.
3. The sensor sheet according to claim 1 , wherein the first adhesive sheet contains polyurethane as a main component and has a thickness of no more than 20 μm.
4. The sensor sheet according to claim 1 , wherein the second adhesive sheet is higher in strength than the first adhesive sheet.
5. The sensor sheet according to claim 1 , wherein:
each of the wires has a meandering shape in a surface of the second adhesive sheet.
6. The sensor sheet according to claim 1 , wherein:
each of the wires is formed on a film base material that is less flexible than the first and second adhesive sheets.
7. The sensor sheet according to claim 1 , wherein the sensor sheet is used for continuous electrocardiogrameasurement for at least two weeks.
8. The sensor sheet according to claim 1 , wherein the peripheral edge area of the second adhesive sheet is a buffer area having a stretchability that is lower than that of the first adhesive sheet and higher than that of the center area of the second adhesive sheet.