Sensor chip, and measurement device and blood test device in which this sensor chip is used

1. A sensor chip for analyzing the components of a biological sample, comprising:

a substrate in the form of a flat board;

a sample inlet that is provided to one end of the substrate, into which flows the biological sample used for analysis;

a supply path that communicates with the sample inlet and into which the biological sample is introduced;

detection electrodes that are provided to the supply path and detect signals used for analysis; and

a surplus blood reservoir that is provided to the substrate and into which extra blood not used for analysis is drawn and held,

wherein the substrate has a surplus blood inlet that is provided to an end of the substrate and communicates with the surplus blood reservoir, and

the surplus blood inlet draws the surplus blood into the surplus blood reservoir by capillary action.

2. The sensor chip according to claim 1 ,

wherein the surplus blood reservoir has a open on one or more faces of the substrate.

3. The sensor chip according to claim 1 ,

wherein the volume of the surplus blood reservoir is greater than the volume of the supply path.

4. The sensor chip according to claim 1 ,

wherein the volume of the surplus blood reservoir is no more than two thirds the volume of the substrate.

5. The sensor chip according to claim 1 ,

wherein the supply path and the surplus blood reservoir are formed by the same member.

6. The sensor chip according to claim 5 ,

wherein the substrate is formed by laminating a base plate, a spacer, and a cover.

7. The sensor chip according to claim 6 ,

wherein the supply path and the surplus blood reservoir are formed in different layers.

8. The sensor chip according to claim 7 ,

wherein the supply path and the surplus blood reservoir are formed by separate members.

9. The sensor chip according to claim 1 ,

wherein the surplus blood inlet is provided to a first edge of the substrate, and

there is further provided a supply path that passes through the substrate in between two opposite edges.

10. The sensor chip according to claim 1 ,

wherein the sample inlet is provided to a first edge side of the substrate, and

the surplus blood inlet is provided to a second edge side of the substrate.

11. The sensor chip according to claim 1 ,

wherein the supply path has a first air hole that communicates with the outside air and is provided to a location that is opposite the sample inlet side.

12. The sensor chip according to claim 1 ,

wherein the surplus blood reservoir has a second air hole that communicates with the outside air and is provided in order to draw in surplus blood.

13. The sensor chip according to claim 1 ,

wherein the surplus blood reservoir is an absorption member that was provided to the substrate and absorbs surplus blood, which is extra biological sample but not used in the analysis.

14. The sensor chip according to claim 13 ,

wherein the absorption member has a thin-film shape and is attached to one face of the substrate.

15. The sensor chip according to claim 13 ,

wherein the absorption member is formed from nonwoven cloth.

16. A measurement device, comprising:

a housing;

a sensor insertion portion that is provided to part of the housing and into which the sensor chip according to claim 1 is inserted;

a connector that is provided to the sensor insertion portion;

a measurement circuit that is connected to the connector; and

a display component that is connected to the output of the measurement circuit and displays the result of measuring analysis data for a biological sample introduced to the sensor chip and measured with the measurement circuit.

17. A blood test device, comprising:

a housing;

a sensor insertion portion that is provided to part of the housing and into which the sensor chip according to claim 1 is inserted;

puncture component configured to puncture the skin, provided at or near a location that is opposite the sensor insertion portion;

a connector that is provided to the sensor insertion portion;

an electrical circuit that is connected to the connector and performs analysis of a biological sample; and

a display component that is connected to the output of the electrical circuit.

18. A sensor chip for analyzing the components of a biological sample, comprising:

a substrate in the form of a flat board;

a sample inlet that is provided to one end of the substrate, into which flows the biological sample used for analysis;

a supply path that communicates with the sample inlet and into which the biological sample is introduced;

detection electrodes that are provided to the supply path and detect signals used for analysis; and

a surplus blood reservoir that is provided to the substrate and into which extra blood not used for analysis is drawn and held,

wherein the substrate has a surplus blood inlet that is provided to an end of the substrate and communicates with the surplus blood reservoir,

the surplus blood inlet draws the surplus blood into the surplus blood reservoir by capillary action,

the volume of the surplus blood reservoir is greater than the volume of the supply path,

the surplus blood reservoir is given a hydrophilic treatment or is formed from a hydrophilic material, and

an area around the surplus blood reservoir is given water-repellency treatment or is formed from a water-repellant material.