Test fluid measurement device and sensitivity calibration method thereof

• US 7,794,655 B2
• Filed: 12/14/2007
• Issued: 09/14/2010
• Est. Priority Date: 12/20/2006
• Status: Expired due to Fees

• Current Assignee: Tanita Corporation (Tanita)
• Original Assignee: Tanita Corporation (Tanita)
• Inventors: Ikeda, Satoshi, Ohashi, Akio
• Primary Examiner(s): Warden; Jill
• Assistant Examiner(s): Hammond; Charles
• Application Number:
  US11/956,921
• Publication Number:
  US 20080159914A1
• Time in Patent Office: 1,005 Days
• Field of Search: None
• US Class Current: 422/68.1
• CPC Class Codes: G01N 33/493 urine

Abstract

A test fluid measurement device includes an output acquisition unit for acquiring an output value from a urinary sugar sensor, when a reference fluid, set to a specified density, is applied to the urinary sugar sensor. By using this output value to set a reference value, a reference value setting unit calibrates the sensitivity of the urinary sugar sensor. During sensitivity calibration, an output value judgment unit determines according to an output value that is already acquired by the output acquisition unit whether or not the output value that is newly acquired by the output acquisition unit is suitable to be set as the reference value. After an output value is determined not to be suitable as the reference value setting, a reference fluid detection unit detects when more reference fluid from which another output value is to be acquired by the output acquisition unit has been additionally applied.

Claims

1. A test fluid measurement device comprising:

a biosensor that measures the amount of a certain substance that is contained in a test fluid;

output acquisition means for acquiring the output value of said biosensor when a reference fluid containing said certain substance that is set to a specified density is applied to said biosensor during a sensitivity calibration of said biosensor;

setting means for calibrating the sensitivity of said biosensor by setting a reference value that will be a reference for measurement by said biosensor using said output value that was acquired from said biosensor by said output acquisition means;

judgment means for determining whether or not a said output value that is newly acquired from said biosensor by said output acquisition means during said sensitivity calibration by said setting means is suitable to be used as the setting for said reference value based on a previous output value that has already been acquired from said biosensor by said output acquisition means; and

detection means for detecting when said reference fluid, which is the subject of acquiring another output value by said output acquisition means, is additionally applied to said biosensor after said judgment means determines that an output value is not suitable as the setting for said reference value,

wherein when said judgment means has determined that the new output value is not suitable as the setting for said reference value, the additional application of more reference fluid to said biosensor is detected without performing a cleaning process.

2. The test fluid measurement device of claim 1, wherein

said setting means sets said output value from said biosensor, which was determined by said judgment means to be suitable as the setting for said reference value, as said reference value.

3. The test fluid measurement device of claim 1, wherein

said setting means sets the average of said output values, which were acquired by said output acquisition means a specified number of times and were determined by said judgment means to be suitable as the setting for said reference value, as said reference value.

4. The test fluid measurement device of claim 1, wherein

said judgment means determines that said output value from said biosensor that was acquired the first time by said output acquisition means during said sensitivity calibration by said setting means is not suitable as the setting for said reference value.

5. The test fluid measurement device of claim 1, wherein

said detection means detects that said reference fluid has been additionally applied to said biosensor due to change in the output value from said biosensor that is acquired by said output acquisition means.

6. The test fluid measurement device of claim 1, wherein said detection means comprises temperature detection means for detecting the temperature of said biosensor;

wherein said temperature detection means detects that said reference fluid has been additionally applied to said biosensor due to change in the temperature of said biosensor.

7. The test fluid measurement device of claim 1 wherein said detection means comprises impact detection means for detecting physical impact that is applied to said biosensor;

wherein said impact detection means detects that said reference fluid has been additionally applied to said biosensor due to impact to said biosensor.

8. The test fluid measurement device of claim 1, further comprising

addition confirmation means for a user to input confirmation that said reference fluid has been additionally applied to said biosensor;

wherein

said detection means detects that said reference fluid has been additionally applied to said biosensor due to said addition confirmation that is input from said addition confirmation means.

9. The test fluid measurement device of claim 1, wherein

said output acquisition means has two operating states;

a non acquisition state in which said output value from said biosensor is not acquired even though said reference fluid is applied, and an acquisition state in which said output value from said biosensor is acquired when said reference fluid is applied; and

comprises

an instruction input means for a user to input an instruction to change said operating state of said output acquisition means from said non acquisition state to said acquisition state; and

wherein

said output acquisition means changes said operating state from said non acquisition state to said acquisition state based on said change instruction that is input from said instruction input means.

10. The test fluid measurement device of claim 9, wherein

said output acquisition means acquires an output value from said biosensor after a specified amount of time has elapsed from the instant when said operating state of said output acquisition means changes from said non acquisition state to said acquisition state.

11. The test fluid measurement device of claim 9, further comprising notification means for notifying that said operating state of said output acquisition means is either said non acquisition state or said acquisition state.

12. The test fluid measurement device of claim 1, wherein the additional application of more reference fluid to said biosensor is carried out manually by a user.

13. The test fluid measurement device of claim 1, wherein the device is portable.

14. The test fluid measurement device of claim 1, wherein the certain substance is sugar content in the urine of the test fluid, and the biosensor is a urine sugar sensor.

15. The test fluid measurement device of claim 1, wherein the judgment means makes the process end in error when said output value is not obtained even though the reference fluid is continuously measurement a specified number of times.

16. The test fluid measurement device of claim 1, wherein the judgment means determines whether or not the difference between the previous output value and said newly acquired output value which the output value is an allowable limit value or less and judges whether or not said sensitivity calibration is suitable, wherein

the judgment means uses a measurement reference value that is present when said previous value has not been measured.

17. The test fluid measurement device of claim 10, wherein

the specified amount of time to acquisition of the output value is a variable value, and the variable value is shorter for the second judgment and later.

18. The test fluid measurement device of claim 11, wherein said output acquisition means acquires an output value from said biosensor after a specified amount of time has elapsed from the instant when said operating state of said output acquisition means changes from said non acquisition state to said acquisition state, and

wherein the specified amount of time to acquisition of the output value, and the variable value is shorter for the second judgment and later.

19. A sensitivity calibration method for calibrating the sensitivity of a biosensor, comprising steps of:

providing a biosensor that measures the amount of a certain substance that is contained in a test fluid;

acquiring the output value of said biosensor when a reference fluid containing said certain substance that is set to a specified density is applied to said biosensor during a sensitivity calibration of said biosensor;

setting a reference value that will be a reference for measurement by said biosensor using said acquired output value;

determining whether or not a said output value that is newly acquired from said biosensor during said sensitivity calibration is suitable to be used as the setting for said reference value based on a previous output value that has already been acquired; and

detecting when said reference fluid, which is the subject of acquiring another output value, has been additionally applied to said biosensor after an output value is determined not to be suitable as the setting for said reference value,

wherein when said determining step has determined that the output value is not suitable as the setting for said reference value, the additional application of more reference fluid to said biosensor is detected without performing a cleaning process.

20. The sensitivity calibration method of claim 19, wherein the additional application of more reference fluid to said biosensor is carried out manually by a user.