Extracting device, extracting method, analyzer and analyzing method

• US 20050096520A1
• Filed: 11/04/2004
• Published: 05/05/2005
• Est. Priority Date: 11/04/2003
• Status: Abandoned Application

• Current Assignee: Sysmex Corporation
• Original Assignee: Sysmex Corporation
• Inventors: Maekawa, Yasunori, Sato, Toshiyuki, Okada, Seiki, Sawa, Kennichi, Nagaoka, Kanako, Asano, Kaoru
• Application Number:
  US10/982,101
• Publication Number:
  US 20050096520A1
• Time in Patent Office: Days
• US Class Current: 600/365
• CPC Class Codes: A61B 2010/008 Interstitial fluid
• CPC Class Codes: A61B 5/14514 using means for aiding extraction of interstitial fluid, e.g. microneedles or suction
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/14546 for measuring analytes not otherwise provided for, e.g. ions, cytochromes

Abstract

Extraction devices for extracting analyte through the skin of a living body are disclosed that includes first and second extraction units which are placed on the skin and in which analyte is extracted; electrode unit placed on the skin; and a power source unit for outputting a first current flowing through the electrode unit, the living body, and the first extraction unit, and a second current flowing through the electrode unit, the living body, and the second extraction unit.

Claims

1. An extracting device for extracting analyte through the skin of a living body, comprising:

first and second extraction units which are placed on the skin and in which analyte is extracted;

electrode unit placed on the skin; and

a power source unit for outputting a first current flowing through the electrode unit, the living body, and the first extraction unit, and a second current flowing through the electrode unit, the living body, and the second extraction unit.

2. The extracting device of claim 1, wherein the power source unit comprises first and second power sources, and the first power source outputs the first current, and the second power source outputs the second current.

3. The extracting device of claim 2, wherein the first power source is electrically connected to the first extraction unit and the electrode unit, and the second power source is electrically connected to the second extraction unit and the electrode unit.

4. The extracting device of claim 2, wherein the first power source is a constant current source.

5. The extracting device of claim 4, wherein the constant current power source comprises terminals at both ends, and a voltage limiting unit for limiting the difference in electric potential between the terminals so as to not exceed a predetermined value.

6. The extracting device of claim 2, wherein the first power source is a constant voltage source.

7. The extracting device of claim 6, wherein the constant voltage power source comprises a current limiting unit for limiting the magnitude of the output current so as to not exceed a predetermined value.

8. The extracting device of claim 1, wherein the magnitude of the first current flowing through the first extraction unit and the magnitude of the second current flowing through the second extraction unit are substantially the same.

9. The extracting device of claim 1, wherein the potential difference between the electrode unit and the first extraction unit while the power source unit outputs the first current, and the potential difference between the electrode unit and the second extraction unit while the power source unit outputs the second current are substantially the same.

10. The extracting device of claim 1, wherein the power source unit outputs both the first current and second current at predetermined moments.

11. The extracting device of claim 1, wherein the first current is a current output from the power source unit and sequentially flows through the electrode unit, the living body, and the first extraction unit and returns to the power source unit, and the second current is a current output from the power source unit and sequentially flows through the electrode unit, the living body, and the second extraction unit and returns to the power source unit.

12. The extracting device of claim 1, further comprising

a resistance adjusting unit for adjusting the electrical resistance between the power source unit and the first extraction unit, the resistance adjusting unit being disposed between the power source unit and the first extraction unit;

and

a control unit for controlling the resistance adjusting unit such that the magnitude of the first current flowing through the first extraction unit does not exceed a predetermined value.

13. The extracting device of claim 12, further comprising

a current monitor for monitoring the magnitude of the first current, and wherein the control unit controls the resistance adjusting unit based on a monitoring result of the current monitor.

14. The extracting device of claim 1, wherein the first extraction unit comprises an electrode electrically connected to the power source unit, and a collection medium for collecting analyte extracted from living body tissue through the skin.

15. The extracting device of claim 14, wherein the second extraction unit comprises a second electrode electrically connected to the power source unit, and a second collection medium for collecting analyte extracted from living body tissue through the skin.

16. The extracting device of claim 15, wherein the electrode unit comprises a third electrode electrically connected to the power source unit.

17. The extracting device of claim 1, wherein the magnitude of the first current flowing through the first extraction unit and the magnitude of the second current flowing through the second extraction unit do not exceed approximately 500 μ

A.

18. The extracting device of claim 1, wherein the power source unit outputs the first and second currents such that the potential difference between the electrode unit and the first extraction unit and the potential difference between the electrode unit and the second extraction unit do not exceed approximately 20 V.

19. The extracting device of claim 1, wherein the magnitude of the first current flowing through the first extraction unit does not exceed a predetermined value regardless of the state of formation of analyte transmission paths, through which analyte passes, formed in the skin by the flow of the first current through the living body;

and

the magnitude of the second current flowing through the second extraction unit does not exceed a predetermined value regardless of the condition of formation of analyte transmission paths, thorough which analyte passes, formed in the skin by the flow of the second current through the living body.

20. The extracting device of claim 1, wherein the analyte is glucose.

21. An analyzer comprising:

the extracting device of claim 1;

sensor for detecting signals based on the analyte extracted in the first and second extraction units;

analysis unit for analyzing the signals detected by the sensor and obtaining analysis result of analyte; and

an output unit for outputting the analysis result obtained by the analysis unit.

22. An extracting device for extracting an analyte through the skin of a living body, comprising:

an extracting part having a plurality of extraction units placed on the skin of a living body;

extraction energy supplying part for supplying an extraction energy necessary for the extraction of a quantity of analyte necessary for analysis to the plurality of extraction units; and

wherein

the extraction energy supplying part supplies constant quantity of energy to the respective extraction units regardless of the state of formation of the analyte transmission paths, through which analyte transmits.

23. The extracting device of claim 22, wherein

the plurality of extraction units have respective extraction electrodes;

the extraction energy supplying part includes a power source for supplying electrical current to the extraction part as the extraction energy; and

the power source supplies a constant current for a predetermined time to the respective extraction electrodes regardless of the state of the formation of the analyte transmission paths.

24. An extracting method for extracting analyte through the skin of a living body, comprising:

placing first and second extraction units in which analyte is extracted, on the skin;

placing an electrode unit on the skin; and

outputting from a power source unit a first current flowing through the electrode unit, the living body, and the first extraction unit, and a second current flowing through the electrode unit, the living body, and the second extraction unit.

25. The extracting method of claim 24, wherein

the power source unit comprises first and second power sources;

the first power source outputs the first current; and

the second power source outputs the second current.

26. The extracting method of claim 24, wherein the magnitude of the first current flowing through the first extraction unit and the magnitude of the second current flowing through the second extraction unit are substantially the same.

27. The extracting method of claim 24, wherein the potential difference between the electrode unit and the first extraction unit while the power source unit outputs the first current, and the potential difference between the electrode unit and the second extraction unit while the power source unit outputs the second current are substantially the same.

28. The extracting method of claim 24, wherein the power source unit outputs both the first current and the second current at predetermined moments.

29. The extracting method of claim 24 further comprising:

adjusting the electrical resistance between the power source unit and the first extraction unit such that the magnitude of the first current flowing through the first extraction unit does not exceed a predetermined value.

30. The extracting method of claim 24, wherein the analyte is glucose.

31. An analyzing method comprising:

the extracting method of claim 24;

detecting signals based on the analyte extracted in the first and second extraction units;

analyzing the detected signals and obtaining an analysis result; and

outputting the obtained analysis result.

32. An extracting method for extracting an analyte through the skin of a living body, comprising:

placing a plurality of extraction units on the skin;

supplying extraction energy necessary for the extraction of a quantity of analyte needed for analysis to the plurality of extraction units; and

wherein

the amount of extraction energy to the respective extraction units are constant regardless of the state of the formation of analyte transmission paths, through which analyte transmits.

33. The extracting method of claim 32, wherein the extraction energy is electric energy.