Sample analyzer and reagent information writing method

1. A sample analyzer for analyzing a sample by using a reagent contained in a reagent container, the sample analyzer comprising:

a reagent container holder configured to hold a reagent container to which an information storage medium is attached;

an actuator configured to actuate the reagent container holder to move the reagent container held by the reagent container holder to a first position and a second position different from the first position;

a reagent aspirator configured to aspirate a reagent from the reagent container when the reagent container is located at the first position;

an information communication section configured to write reagent amount information regarding an amount of the reagent in the reagent container, into the information storage medium attached to the reagent container when the reagent container is located at the second position; and

a controller configured to control at least the actuator and the information communication section,

wherein the controller is configured to control the actuator and the information communication section such that after a reagent in a first reagent container has been aspirated by the reagent aspirator and before a reagent in a second reagent container which is a next reagent aspirating target after the first reagent container is aspirated by the reagent aspirator, the first reagent container is moved from the first position to the second position and the reagent amount information is written into an information storage medium of the first reagent container.

2. The sample analyzer of claim 1 , wherein

the information communication section is configured to read information stored in the information storage medium attached to the reagent container which is located at the second position, and

the controller is configured to control the actuator and the information communication section such that after the reagent in the first reagent container has been aspirated by the reagent aspirator and before the reagent in the second reagent container is aspirated by the reagent aspirator, the first reagent container is moved from the first position to the second position, and information is read from the information storage medium of the first reagent container, and the reagent amount information is written into the information storage medium of the first reagent container.

3. The sample analyzer of claim 1 , wherein

if a reagent for an analysis item is aspirated following the reagent in the first reagent container and the reagent for the analysis item is the same as an analysis item for which the reagent in the first reagent container is used, the controller determines the first reagent container as the second reagent container which is the next reagent aspirating target after the first reagent container.

4. The sample analyzer of claim 1 , wherein

the reagent amount information contains information indicative of a number of analyses performable within the amount of the reagent in the reagent container.

5. The sample analyzer of claim 1 , wherein

the reagent amount information contains a volume of the reagent in the reagent container.

6. The sample analyzer of claim 1 , further comprising a detector configured to detect a remaining amount of the reagent in the reagent container, wherein

the controller is configured to determine, based on a detection result of the detector, whether a predetermined amount of the reagent is present in the reagent container.

7. The sample analyzer of claim 6 , wherein

the reagent aspirator comprises a reagent aspirating pipette configured to aspirate the reagent from the reagent container,

the detector is a liquid surface detector configured to detect a liquid surface position of the reagent in the reagent container by electrically detecting a contact between the liquid surface in the reagent container and the reagent aspirating pipette, and

the information communication section is configured to write the reagent amount information into the information storage medium via radio wave.

8. The sample analyzer of claim 1 , wherein

the information storage medium is an electronic tag, and

the information communication section comprises an antenna configured to write the reagent amount information into the electronic tag via radio wave.

9. The sample analyzer of claim 1 , wherein

the reagent container held by the reagent container holder comprises a cover,

the sample analyzer further comprises a cover opening mechanism configured to open the cover of the reagent container held by the reagent container holder, and

the controller is configured to control the actuator and the information communication section such that after a reagent in a first reagent container has been aspirated by the reagent aspirator and before a cover of a second reagent container which is a next reagent aspirating target after the first reagent container is opened by the cover opening mechanism, the first reagent container is moved from the first position to the second position and the reagent amount information is written into an information storage medium of the first reagent container.

10. The sample analyzer of claim 9 , further comprising a contact member configured to contact the cover of the reagent container held by the reagent container holder, wherein

the cover of the reagent container is configured to be closed when the contact member and the cover of the reagent container come into contact with each other as a result of a movement of the reagent container from the first position to the second position.

11. The sample analyzer of claim 10 , wherein

the cover opening mechanism and the contact member are both disposed between the first position and the second position, and

the controller is configured to:

actuate the reagent container holder to move the reagent container in a first direction from the second position toward the first position to open, by means of the cover opening mechanism, the cover of the reagent container which is a reagent aspirating target, and to move the reagent container until the reagent container arrives at the first position; and

actuate the reagent container holder to move the reagent container in a second direction opposite to the first direction from the first position toward the second position to close, by means of the contact member, the cover of the reagent container after the reagent has been aspirated from the reagent container, and to move the reagent container until the reagent container arrives at the second position.

12. The sample analyzer of claim 1 , wherein

the controller is configured to:

determine whether the reagent in the reagent container has been aspirated by the reagent aspirator; and

when determining that the reagent in the reagent container has been aspirated by the reagent aspirator, control the information communication section to write the reagent amount information into the information storage medium of the reagent container.

13. The sample analyzer of claim 1 , further comprising a memory, wherein

the controller is configured to store the reagent amount information in the memory when the reagent amount information is written into the information storage medium of the reagent container.

14. A reagent information writing method executed by a sample analyzer which analyzes a sample by using a reagent contained in a reagent container, the reagent information writing method comprising steps of:

moving a reagent container to a first position;

aspirating a reagent from the reagent container when the reagent container is located at the first position;

moving the reagent container to a second position different from the first position after the reagent has been aspirated from the reagent container; and

writing reagent amount information regarding an amount of the reagent in the reagent container, into an information storage medium attached to the reagent container when the reagent container is located at the second position;

aspirating a reagent from a second reagent container which is a next reagent aspirating target, after reagent amount information of a first reagent container has been written into an information storage medium of the first reagent container.

15. The reagent information writing method of claim 14 , further comprising

after the reagent amount information of the first reagent container has been written into the information storage medium of the first reagent container, opening a cover of a second reagent container which is a next reagent aspirating target after the first reagent container.

16. The reagent information writing method of claim 14 , wherein

the information storage medium is an electronic tag; and

the writing step comprises writing the reagent amount information into the electronic tag via radio wave.