Microbial counting cell, microbe counting device using same, and microbe counting method using same

1. A microorganism counting cell, comprising:

a bottomed cylindrical vessel that includes an upper surface opening; and

a cylindrical retaining body disposed vertically on a bottom surface in the vessel for receiving a collecting element provided on a lower end portion of a rod-shaped microorganism collecting tool inserted therein, the retaining body disposed such that a radially exterior side surface of the retaining body is spaced from a radially interior side surface of the cylindrical vessel,

a space that is formed in a shape of substantially circular ring between an inner peripheral surface of the vessel and an outer peripheral surface of the retaining body, and in which a liquid for eluting a microorganism is filled, and

a liquid filled in the space formed between the radially exterior side surface of the retaining body and the radially interior side surface of the cylindrical vessel, and wherein

the retaining body is provided with a plurality of first elution protrusions of a longwall shape formed in an axial direction of the retaining body at predetermined intervals around a radially interior side surface of the retaining body, and elution grooves, each formed to cut through a side surface of the retaining body from the inside to the outside between adjoining two of the plurality of first elution protrusions.

2. The microorganism counting cell according to claim 1 , wherein

the cylindrical retaining body is configured to retain a side surface of the collecting element of the microorganism collecting tool inserted in the retaining body such that the side surface of the collecting element is made to abut on the plurality of first elution protrusions provided on the interior side surface of the retaining body.

3. The microorganism counting cell according to claim 1 , wherein

side surface bodies of an odd number are provided around the side surface of the retaining body.

4. The microorganism counting cell according to claim 1 , wherein

a width of the elution groove in a circumferential direction of the retaining body is smaller than a thickness of a rod of the microorganism collecting tool inserted in the retaining body.

5. The microorganism counting cell according to claim 1 , wherein

a plurality of second elution protrusions are provided circularly at equal intervals around an axis of the retaining body in an interior bottom surface of the retaining body.

6. The microorganism counting cell according to claim 1 , wherein

a liquid is provided on the vessel, and a cover body is detachably provided on the upper surface opening of the vessel.

7. The microorganism counting cell according to claim 1 , wherein

a coupling unit is provided on the outside of the vessel bottom surface for coupling to a rotation driving unit that rotates the vessel.

8. A microorganism counter, comprising:

a vessel retaining unit that retains the bottomed cylindrical vessel including the upper surface opening of the microorganism counting cell according to claim 1 with the opening oriented upward;

a rotation driving unit that rotates the vessel retained by the vessel retaining unit around a vertically rotating shaft;

an electrode insertion unit that inserts a measurement chip in the vessel through the opening from above the vessel retained by the vessel retaining unit; and

a measurement unit that measures a microorganism using a measurement electrode of the measurement chip that is inserted in the vessel by the electrode insertion unit.

9. The microorganism counter according to claim 8 , wherein

the bottom surface of the bottomed cylindrical vessel is upwardly inclined toward an inner wall surface of the vessel.

10. The microorganism counter according to claim 8 , wherein

the vessel retaining unit is configured to rotate the vessel while retaining an outer circumference of the vessel.

11. The microorganism counter according to claim 10 , wherein

the vessel retaining unit is formed into a bottomed cylindrical shape including an opening in an upper surface.

12. The microorganism counter according to claim 11 , wherein

the vessel retaining unit is provided with a driving protrusion that protrudes toward a coupling unit provided on the outside of the vessel bottom surface.

13. The microorganism counter according to claim 8 , wherein

the electrode insertion unit includes a measurement chip-retaining unit that detachably retains the measurement chip.

14. The microorganism counter according to claim 13 , wherein

the measurement chip is mounted above a horizontal position on the electrode insertion unit, and the measurement chip is inserted in the vessel by turning the measurement chip downward.

15. A microorganism counter, comprising:

a vessel retaining unit that retains the bottomed cylindrical vessel including the upper surface opening of the microorganism counting cell according to claim 1 with the opening oriented upward;

a rotation driving unit that rotates the vessel retained by the vessel retaining unit around a vertically rotating shaft;

an electrode insertion unit that inserts a measurement chip in the vessel through the opening from above the vessel retained by the vessel retaining unit; and

a measurement unit that measures a microorganism using a measurement electrode of the measurement chip that is inserted in the vessel by the electrode insertion unit, wherein

the measurement chip is detachably mounted on the electrode insertion unit, and

the microorganism counter further comprises a measurement chip separating body that retains the measurement chip while being inserted in the vessel.

16. The microorganism counter according to claim 15 , wherein

the measurement chip separating body comprises a manipulation body that is inserted in a through-hole formed in the measurement chip.

17. A microorganism counter, comprising:

a body case;

a front surface cover that covers a front surface side of the body case in an openable manner;

a vessel retaining unit provided inside the body case behind the front surface cover, and retains the bottomed cylindrical vessel including the upper surface opening of the microorganism counting cell according to claim 1 with the opening oriented upward;

a rotation driving unit that rotates the vessel retained by the vessel retaining unit around a vertically rotating shaft;

an electrode insertion unit that inserts a measurement chip in the vessel through the opening from above the vessel retained by the vessel retaining unit; and

a measurement unit that measures a microorganism using a measurement electrode of the measurement chip that is inserted in the vessel by the electrode insertion unit, wherein

the measurement chip is detachably mounted on the electrode insertion unit, and

the microorganism counter further comprises a measurement chip separating body that retains the measurement chip while being inserted in the vessel.

18. The microorganism counter according to claim 17 , wherein

the measurement chip separating body comprises a manipulation body that is inserted in a through-hole formed in the measurement chip, and a manipulation pin provided in the manipulation body, wherein the manipulation pin is engaged with a cam plate that is operated by opening and closing operations of the front surface cover.

19. The microorganism counter according to claim 18 , wherein

the cam plate is provided with a flat surface unit that puts the manipulation pin into a non-driving state at a beginning of the opening and closing of the front surface cover.

20. A microorganism counting method using the microorganism counter according to claim 17 , the method comprising:

mounting the vessel on the vessel retaining unit while the front surface cover provided on the front surface side of the body case is opened;

inserting a collecting element provided on a lower end portion of a rod-shaped microorganism collecting tool in a retaining body of the vessel;

mounting the measurement chip on the electrode insertion unit;

closing the front surface cover provided on the front surface side of the body case to have the electrode insertion unit insert the measurement chip in the vessel;

rotating the vessel by the rotation driving unit to elute a microorganism into a liquid in the vessel; and

measuring a number of the microorganisms with the measurement chip of the electrode insertion unit.