Insertion Needle and Lancet With the Same

• US 20090216259A1
• Filed: 12/08/2006
• Published: 08/27/2009
• Est. Priority Date: 12/08/2005
• Status: Abandoned Application

• Current Assignee: ARKRAY, Inc
• Original Assignee: ARKRAY, Inc
• Inventors: Sakata, Tetsuya, Komuro, Hidefumi
• Application Number:
  US12/086,249
• Publication Number:
  US 20090216259A1
• Time in Patent Office: Days
• US Class Current: 606/181
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• CPC Class Codes: A61B 5/150427 Specific tip design, e.g. for improved penetration characteristics
• CPC Class Codes: A61B 5/150503 Single-ended needles hollow piercing element tip design A61B5/150396, needle sets for catheters A61M25/06, needles for bringing media into the body A61M5/32
• CPC Class Codes: A61B 5/15113 Manually triggered, i.e. the triggering requires a deliberate action by the user such as pressing a drive button
• CPC Class Codes: A61B 5/15117 comprising biased elements, resilient elements or a spring, e.g. a helical spring, leaf spring, or elastic strap
• CPC Class Codes: A61B 5/1519 comprising driving means, e.g. a spring, for propelling the piercing unit
• CPC Class Codes: A61B 5/416 the spleen
• CPC Class Codes: A61M 5/3286 Needle tip design, e.g. for improved penetration

Abstract

The present invention relates to a puncture needle (11) formed with a first blade surface (12A), a second blade surface (12B), and a third blade surface (12C). The first blade surface (12A) has a site most distant from a needlepoint formed within a range of 1.5 and 2.5 mm as a distance (D1) in an axial direction (L1) from the needlepoint, and the second and third blade surfaces (12B, 12C) have a site most distant from the needlepoint formed in a range of 0.4 to 0.68 mm as a distance (D2) in the axial direction (L1) from the needlepoint. A ratio (D2/D1) of the distance (D2) with respect to the distance (D1) is preferably set in a range of 0.22 to 0.38.

Claims

1. A puncture needle having a blade arranged at an end;

wherein

the blade includes a first blade surface, a second blade surface, and a third blade surface;

the first blade surface is arranged at a position evacuated from a needlepoint than the second and the third blade surfaces as a whole, and has a site most distant from the needlepoint formed within a range of 1.5 to 2.5 mm as a distance D1 in an axial direction from the needlepoint; and

the second and third blade surfaces define the needlepoint, and a site most distant from the needlepoint is formed within a range of 0.4 to 0.68 mm as a distance D2 in the axial direction from the needlepoint.

2. The puncture needle according to claim 1, wherein a ratio (D2/D1) of the distance D2 with respect to the distance D1 is set in a range of 0.22 to 0.38.

3. The puncture needle according to claim 1, wherein (D1/D2/R) is set in a range of 8.5 to 31.3 where R is an outer diameter of a portion other than the blade.

4. The puncture needle according to claim 1, wherein a cross-section at the site most distant from the needlepoint of the second and the third blade surfaces has a ratio (D3/D4) of a dimension D3 in a first radial direction along a normal line of the first blade surface and a dimension D4 in a second radial direction orthogonal to the first radial direction set in a range of 0.29 to 0.50.

5. The puncture needle according to claim 4, wherein the ratio (D3/D4) is set in a range of 0.33 to 0.50.

6. The puncture needle according to claim 1, wherein the first blade surface has an intersecting angle θ

1 with respect to the axial direction of the puncture needle of 7 to 20 degrees.

7. The puncture needle according to claim 1, wherein the second and the third blade surfaces are formed symmetric or substantially symmetric to each other with respect to an axis of symmetry extending along a normal line of the first blade surface when viewed in the axial direction.

8. The puncture needle according to claim 7, wherein a sandwiching angle θ

2 between the second blade surface and the third blade surface is 120 to 170 degrees.

9. The puncture needle according to claim 1, wherein an outer diameter R of the portion other than the blade is 0.2 to 0.4 mm.

10. The puncture needle according to claim 1, wherein a ratio (D1/R) of the distance D1 in the axial direction from the needlepoint of the site most distant from the needlepoint in the first blade surface with respect to the outer diameter R of the portion other than the blade is 3.75 to 12.50, and a ratio (D2/R) of the distance D2 in the axial direction from the needlepoint of the site most distant from the needlepoint in the second and the third blade surfaces with respect to the outer diameter R is 1.0 to 3.5.

35. A lancet comprising a puncture needle, and a body for holding the puncture needle, wherein the puncture needle is as described in claim 1.

11. A puncture needle having a blade arranged at an end;

wherein

the blade includes a first blade surface, a second blade surface, and a third blade surface;

the first blade surface is arranged at a position evacuated from a needlepoint than the second and the third blade surfaces as a whole;

the second and third blade surfaces define the needlepoint; and

a ratio (D2/D1) of a distance D2 in an axial direction from the needlepoint of a site most distant from the needlepoint in the second and the third blade surfaces with respect to a distance D1 in the axial direction from the needlepoint of a site most distant from the needlepoint in the first blade surface is set in a range of 0.22 to 0.38.

12. The puncture needle according to claim 11, wherein (D1/D2/R) is set in a range of 8.5 to 31.3 where R is an outer diameter of a portion other than the blade.

13. The puncture needle according to claim 11, wherein a cross-section at the site most distant from the needlepoint of the second and the third blade surfaces has a ratio (D3/D4) of a dimension D3 in a first radial direction along a normal line of the first blade surface and a dimension D4 in a second radial direction orthogonal to the first radial direction set in a range of 0.29 to 0.50.

14. The puncture needle according to claim 13, wherein the ratio (D3/D4) is set in a range of 0.33 to 0.50.

15. The puncture needle according to claim 11, wherein the first blade surface has an intersecting angle θ

1 with respect to the axial direction of the puncture needle of 7 to 20 degrees.

16. The puncture needle according to claim 11, wherein the second and the third blade surfaces are formed symmetric or substantially symmetric to each other with respect to an axis of symmetry along a normal line of the first blade surface when viewed in the axial direction.

17. The puncture needle according to claim 16, wherein a sandwiching angle θ

2 between the second blade surface and the third blade surface is 120 to 170 degrees.

18. The puncture needle according to claim 11, wherein an outer diameter R of the portion other than the blade is 0.2 to 0.4 mm.

19. The puncture needle according to claim 11, wherein a ratio (D1/R) of the distance D1 in the axial direction from the needlepoint of the site most distant from the needlepoint at the first blade surface with respect to the outer diameter R of the portion other than the blade is 3.75 to 12.50, and a ratio (D2/R) of the distance D2 in the axial direction from the needlepoint of the site most distant from the needlepoint at the second and the third blade surfaces with respect to the outer diameter R is 1.0 to 3.5.

20. A puncture needle having a blade arranged at an end;

wherein

the blade includes a first blade surface, a second blade surface, and a third blade surface;

the first blade surface is arranged at a position evacuated from a needlepoint than the second and the third blade surfaces as a whole;

the second and third blade surfaces define the needlepoint; and

(D1/D2/R) is set in a range of 8.5 to 31.3 where D1 is a distance in an axial direction from the needlepoint of a site most distant from the needlepoint in the first blade surface, D2 is a distance in the axial direction from the needlepoint of a site most distant from the needlepoint in the second and the third blade surfaces, and R is an outer diameter of a portion other than the blade.

21. The puncture needle according to claim 20, wherein a cross-section at the site most distant from the needlepoint of the second and the third blade surfaces has a ratio (D3/D4) of a dimension D3 in a first radial direction along a normal line of the first blade surface and a dimension D4 in a second radial direction orthogonal to the first radial direction set in a range of 0.29 to 0.50.

22. The puncture needle according to claim 21, wherein the ratio (D3/D4) is set in a range of 0.33 to 0.50.

23. The puncture needle according to claim 20, wherein the first blade surface has an intersecting angle θ

1 with respect to the axial direction of the puncture needle of 7 to 20 degrees.

24. The puncture needle according to claim 20, wherein the second and the third blade surfaces are formed symmetric or substantially symmetric to each other with respect to an axis of symmetry along a normal line of the first blade surface when viewed in the axial direction.

25. The puncture needle according to claim 24, wherein a sandwiching angle θ

2 between the second blade surface and the third blade surface is between 120 to 170 degrees.

26. The puncture needle according to claim 20, wherein an outer diameter R of the portion other than the blade is 0.2 to 0.4 mm.

27. The puncture needle according to claim 20, wherein a ratio (D1/R) of the distance D1 in the axial direction from the needlepoint of the site most distant from the needlepoint in the first blade surface with respect to the outer diameter R of the portion other than the blade is 3.75 to 12.50, and a ratio (D2/R) of the distance D2 in the axial direction from the needlepoint of the site most distant from the needlepoint in the second and the third blade surfaces with respect to the outer diameter R is 1.0 to 3.5.

28. A puncture needle having a blade arranged at an end;

wherein

the blade includes a first blade surface, a second blade surface, and a third blade surface;

the first blade surface is arranged at a position evacuated from a needlepoint than the second and the third blade surfaces as a whole;

the second and third blade surfaces define the needlepoint; and

a cross-section at a site most distant from the needlepoint in the second and the third blade surfaces has a ratio (D3/D4) of a dimension D3 in a first radial direction along a normal line of the first blade surface and a dimension D4 in a second radial direction orthogonal to the first radial direction set in a range of 0.29 to 0.50.

29. The puncture needle according to claim 28, wherein the ratio (D3/D4) is set in a range of 0.33 to 0.50.

30. The puncture needle according to claim 28, wherein the first blade surface has an intersecting angle θ

1 with respect to the axial direction of the puncture needle of 7 to 20 degrees.

31. The puncture needle according to claim 28, wherein the second and the third blade surfaces are formed symmetric or substantially symmetric to each other with respect to an axis of symmetry along a normal line of the first blade surface when viewed in the axial direction.

32. The puncture needle according to claim 31, wherein a sandwiching angle θ

2 between the second blade surface and the third blade surface is 120 to 170 degrees.

33. The puncture needle according to claim 28, wherein an outer diameter R of the portion other than the blade is 0.2 to 0.4 mm.

34. The puncture needle according to claim 28, wherein a ratio (D1/R) of the distance D1 in the axial direction from the needlepoint of the site most distant from the needlepoint in the first blade surface with respect to the outer diameter R of the portion other than the blade is 3.75 to 12.50, and a ratio (D2/R) of the distance D2 in the axial direction from the needlepoint of the site most distant from the needlepoint in the second and the third blade surfaces with respect to the outer diameter R is 1.0 to 3.5.