Detection device

1. A detection device comprising:

a base plate having a first surface and a second surface opposite to the first surface, the base plate being defined with a first region and a second region that is adjacent to the first region;

a detection electrode that is arranged at a position on an arrangement plane defined on the first surface of the base plate within the first region;

a single drive electrode that is arranged on the arrangement plane at a position entirely surrounding an in-plane circumference of the detection electrode; and

a controller that is arranged on the base plate within the second region and on the second surface, the controller being configured to:

drive the drive electrode to generate lines of electric force between the detection electrode and the drive electrode;

detect lines of electric force passing through a tubular body and entering the detection electrode; and

detect a state of the tubular body based on the detected lines of electric force entering the detection electrode.

2. The detection device according to claim 1 ,

wherein the state of the tubular body includes any one of: presence or absence of the tubular body at the specified position; type of diameter of the tubular body; presence or absence of a fluid flowing through the tubular body; type of the fluid; and presence or absence of a bubble in the fluid.

3. The detection device according to claim 1 ,

wherein a surface of the detection electrode is configured to be a flat surface, and

wherein the tubular body is arranged at a specified position that is defined at a position above the surface of the detection electrode, and at which the tubular body abuts or is in close proximity to the surface of the detection electrode.

4. The detection device according to claim 1 further comprising:

a cover configured to cover the detection electrode and the drive electrode.

5. The detection device according to claim 4 ,

wherein the cover is made of non-conductive material.

6. The detection device according to claim 5 ,

wherein the cover is made of resin material.

7. The detection device according to claim 1 further comprising:

a ground electrode that is arranged on the second surface of the base plate,

wherein the drive electrode is arranged at a position where the detection electrode is interposed or at a position surrounding the detection electrode, and

wherein the lines of electric force are generated from a plurality of places and in a plurality of directions.

8. The detection device according to claim 7 ,

wherein the base plate is configured by a flexible printed circuit board.

9. The detection device according to claim 8 ,

wherein the flexible printed circuit board is configured to be wrapped around the tubular body facing the arrangement plane toward the tubular body.

10. The detection device according to claim 1 ,

wherein the tubular body is a transfusion tube, and

wherein the controller is configured to detect a bubble in liquid flowing through the transfusion tube.

11. A detection device comprising:

a base member having a first surface and a second surface opposite to the first surface, the first surface being faced to a tubular body;

a first electrode provided on the first surface of the base member;

a single second electrode provided on the first surface of the base member and entirely surrounding an in-plane circumference of the first electrode; and

a controller disposed on the second surface configured to generate lines of electric force between the first electrode and the second electrode and to detect a state of the tubular body by detecting lines of electric force entering one of the first and second electrodes.

12. The detection device according to claim 11 further comprising:

a cover member provided above the first and second electrodes and covers the first and second electrodes.

13. The detection device according to claim 11 ,

wherein the first surface of the base member has a flat surface.

14. The detection device according to claim 11 ,

wherein the first surface of the base member has a shape corresponding to an outer shape of the tubular body.

15. The detection device according to claim 14 ,

wherein the first surface of the base member has a curved surface.

16. The detection device according to claim 11 further comprising:

a third electrode provided on the second surface of the base member and grounded to a ground potential.

17. The detection device according to claim 11 ,

wherein one of the first and second electrodes is substantially surrounded by the other of the first and second electrodes.

18. The detection device according to claim 17 ,

wherein one of the first and second electrodes has a lattice or a comb-like configuration.

19. A detection device comprising:

a base plate having a first surface and a second surface opposite to the first surface, the base plate being defined with a first region and a second region that is adjacent to the first region;

a detection electrode that is arranged at a position on an arrangement plane defined on the first surface of the base plate within the first region;

a single drive electrode that is arranged on the arrangement plane at a position entirely surrounding an in-plane circumference of the detection electrode, the drive electrode being configured to produce an electric field between the detection electrode and the drive electrode; and

a controller that is arranged on the base plate within the second region and on the second surface, the controller being configured to:

detect a state of tubular body in the electric field based on an electrostatic capacity between the detection electrode and the drive electrode.

20. The detection device according to claim 1 ,

wherein the controller is arranged on the second surface of the base plate within the second region.

21. The detection device according to claim 19 ,

wherein the controller is arranged on the second surface of the base plate within the second region.