Electrolyte analysis test strip, test strip manufacturing method and electrolyte analysis device

1 . An electrolyte analysis test strip for measuring a concentration ratio between a first ion species and a second ion species contained in an electrolyte, the electrolyte analysis test strip comprising:

a substrate extending in one direction;

a first ion-sensitive film including a first material facing outwardly from the substrate in a specific region on one end side in the one direction on one main surface of the substrate and comes into contact with the electrolyte to generate a first potential corresponding to a concentration of the first ion species;

a first extraction electrode extending from the first ion-sensitive film to another end side opposite to the one end side on the one main surface;

a second ion-sensitive film including a second material facing outwardly from the substrate in a specific region on the one end side on an other main surface opposite to the one main surface of the substrate, and comes into contact with the electrolyte to generate a second potential corresponding to a concentration of the second ion species; and

a second extraction electrode extending from the second ion-sensitive film to the other end side on the other main surface, wherein

the substrate includes a first substrate and a second substrate,

the one main surface is a surface being farther from the second substrate out of two main surfaces of the first substrate,

the other main surface is a surface being farther from the first substrate out of two main surfaces of the second substrate, and

an adhesive or a double-sided adhesive tape that integrally bonds the first substrate and the second substrate is disposed between a back surface opposite to the surface as the one main surface of the first substrate and a back surface opposite to the surface as the other main surface of the second substrate.

2 . The electrolyte analysis test strip according to claim 1 , wherein

the electrolyte is urine,

the first ion species is a sodium ion, and

the second ion species is a potassium ion.

3 . The electrolyte analysis test strip according to claim 1 , wherein sensitivity of the first ion-sensitive film and sensitivity of the second ion-sensitive film are equivalent to each other, and selectivity of the first ion-sensitive film and selectivity of the second ion-sensitive film are equivalent to each other.

4 . The electrolyte analysis test strip according to claim 1 , wherein

the substrate has, on the one end side in the one direction, a through-hole extending from the one main surface to the other main surface in a region other than a region occupied by the first and second ion-sensitive films and the first and second extraction electrodes.

5 . The electrolyte analysis test strip according to claim 1 , further comprising:

a permeable member formed of a material permeable to the electrolyte, wherein

the permeable member spatially continuously covers the first ion-sensitive film and the second ion-sensitive film with lying across an end surface of the substrate from the one main surface to the other main surface.

6 . An electrolyte analysis device for measuring a concentration ratio between a first ion species and a second ion species contained in an electrolyte, the electrolyte analysis device comprising:

the electrolyte analysis test strip according to claim 1 ; and

a main body, the main body including

a connector into which the other end side of the electrolyte analysis test strip is inserted, the connector including a first contact electrode and a second contact electrode that are in contact with the first extraction electrode and the second extraction electrode, respectively, and

a calculation unit that calculates the concentration ratio between the first ion species and the second ion species contained in the electrolyte based on a potential difference between the first potential and the second potential obtained through the first contact electrode and the second contact electrode of the connector when the first and second ion-sensitive films of the electrolyte analysis test strip come into contact with the electrolyte.

7 . A test strip manufacturing method for producing the electrolyte analysis test strip according to claim 1 , the method comprising:

providing the first substrate and the second substrate;

forming the first extraction electrode extending from the specific region on the one end side to the other end side opposite to the one end side in the one direction on a surface as the one main surface of the first substrate;

forming the second extraction electrode extending from the specific region on the one end side to the other end side on a surface as the other main surface of the second substrate;

then applying a first material solution for the first ion-sensitive film onto a portion of the first extraction electrode, the portion formed in the specific region, on the surface as the one main surface of the first substrate, and drying and/or curing the applied first material solution to form the first ion-sensitive film including the first material;

applying a second material solution for the second ion-sensitive film onto a portion of the second extraction electrode, the portion being formed in the specific region, on the surface as the other main surface of the second substrate, and drying and/or curing the applied second material solution to form the second ion-sensitive film including the second material; and

subsequently laminating and bonding, by an adhesive or a double-sided adhesive tape, the back surface opposite to the surface as the one main surface of the first substrate and the back surface opposite to the surface as the other main surface of the second substrate to each other, such that the first and second substrates are integrated as the substrate.