Method and apparatus of sampling suction effusion fluid

• US 5,882,317 A
• Filed: 09/19/1997
• Issued: 03/16/1999
• Est. Priority Date: 09/20/1996
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Kajiwara, Yuji, Saito, Atsushi, Saito, Soichi
• Primary Examiner(s): Hindenburg, Max
• Assistant Examiner(s): WINGOOD, PAMELA LYNN
• Application Number:
  US08/934,159
• Time in Patent Office: 543 Days
• Field of Search: 600/578, 600/573, 606/167, 606/172, 606/169, 606/181, 606/183, 606/185, 606/186, 604/21, 604/22
• US Class Current: 600/578
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/411 Detecting or monitoring allergy or intolerance reactions to an allergenic agent or substance
• CPC Class Codes: A61B 5/4261 Evaluating exocrine secretion production A61B3/101 takes precedence
• CPC Class Codes: A61B 5/4881 Determining interstitial fluid distribution or content within body tissue measuring analytes in interstitial fluid in-vivo A61B5/1451

Abstract

A method of sampling a suction effusion fluid is provided, which is convenient and highly efficient and which leaves no marks on the skin. First, (a) A suction cell with a cup-shaped hollow body is prepared. The body has an inner space, an aperture connected to the inner space, and a suction port connected to the inner space. The aperture is applied to a skin of a living organism. The inner space of the body is evacuated through the suction port. Next, (b) Bores are formed in a horny layer of the skin of the living organism. The bores has a depth that penetrates the horny layer and do not reach a capillary tube in the skin. Further, (c) The suction cell is held so that the aperture of the cell is opposed to the skin. The cell covers the bores formed in the horny layer and is tightly contacted with the skin. Finally, (d) The inner space of the suction cell is evacuated in such a way that the skin is bulged and the bores are expanded. Thus, the suction effusion fluid is sampled from the skin of the living organism through the suction cell.

Claims

1. A sampling method of a suction effusion fluid, the method comprising the steps of:

(a) preparing a suction cell with a cup-shaped hollow body;

said body having an inner space, an aperture connected to said inner space, and a suction port connected to said inner space;

said aperture being applied to a skin of a living organism;

said inner space of said body being evacuated through said suction port;

(b) forming bores in a horny layer of said skin of said living organism;

said bores having a depth that penetrates said horny layer and do not reach a capillary tube in said skin;

(c) holding said suction cell so that said aperture of said cell is opposed to said skin;

said cell covering said bores formed in said horny layer and being tightly contacted with said skin; and

(d) evacuating said inner space of said suction cell in such a way that said skin is bulged and said bores are expanded;

wherein said suction effusion fluid is sampled from said skin of said living organism through said bores of said horny layer.

2. A method as claimed in claim 1, wherein said bores are formed by piercing said skin with needles under application of vibration in an axial direction.

3. A method as claimed in claim 1, wherein the depth of said bores is 0.5 mm or less.

4. A sampling apparatus of a suction effusion fluid, said apparatus comprising:

(a) a piercing jig having needles for piercing a horny layer of a skin of a living organism to thereby form bores for sucking said suction effusion fluid;

said bores being formed to penetrate said horny layer and not to reach a capillary tube in said skin; and

(b) a suction cell for sucking said suction effusion fluid from said living organism;

said cell including a cup-shaped hollow body;

said body having an inner space, an aperture connected to said inner space, and a suction port connected to said inner space;

said aperture being applied to said skin of said living organism;

said inner space of said body being evacuated through said suction port;

wherein on sampling, said suction cell is held so that said aperture of said cell is opposed to said skin;

and wherein said cell covers said bores formed in said horny layer and is tightly contacted with said skin;

and wherein said inner space of said suction cell is evacuated through said suction port in such a way that said skin is bulged and said bores are expanded;

and wherein said suction effusion fluid is sampled from said skin of said living organism through said bores of said horny layer.

5. An apparatus as claimed in claim 4, wherein each of said piercing jig has a vibration mechanism that produces axial vibration of said needles to ensure piercing of said needles into said skin.

6. An apparatus as claimed in claim 4, wherein said needles of said piercing jig are designed for forming said bores having a depth of 0.5 mm or less.

7. An apparatus as claimed in claim 4, wherein said body of said suction cell has a cylindrical shape so that said skin is sucked into said cylindrical inner space of said body through said circular aperture due to suction.

8. An apparatus as claimed in claim 4, wherein said body of said cell includes a hole plate fitted to said aperture;

and wherein said hole plate has holes through which said skin is bulged and said bores are expanded.

9. An apparatus as claimed in claim 4, wherein said body of said cell has a funnel shape so that the top of said inner space is curved semi-spherically.

10. An apparatus as claimed in claim 4, further comprising a spacer having a semi-spherical inner space;

said spacer is fitted to said aperture of said body.

11. An apparatus as claimed in claim 4, further comprising a sensor for determining the constituents of said suction effusion fluid;

wherein said sensor is integrally attached to said cell.

12. An apparatus as claimed in claim 4, wherein each of said needles of said piercing jig has a tip diameter of 1 to 5 μ

m and a tip angle of 15 to 45°

.

13. An apparatus as claimed in claim 4, wherein said needles are pierced under application of vibration in an axial direction.

14. An apparatus as claimed in claim 4, wherein said opening of said suction cell is of a circular with a diameter of 5 mm to 50 mm, or a polygonal shape with an area equivalent to said circular shape.

15. An apparatus as claimed in claim 4, wherein said suction cell has an inner wall that is curved in a circular arc and provided with radial grooves.

16. An apparatus as claimed in claim 4, wherein said suction cell has a spacer with through holes in an opening.

17. An apparatus as claimed in claim 16, wherein said spacer has an opening rate of 20% or higher.

18. An apparatus as claimed in claim 16, wherein the number of said through holes in said spacer ranges from 2 to 20.

19. An apparatus as claimed in claim 16, wherein said spacer has a semi-spherical space on a back side of said through hole, and a wall surrounding said semi-spherical space is provided with radial grooves connecting to said through hole.

20. An apparatus as claimed in claim 16, wherein said suction cell has radial channel grooves connecting to said through holes.