Liquid indection needle and liquid injection device

• US 20040078008A1
• Filed: 07/23/2003
• Published: 04/22/2004
• Est. Priority Date: 01/25/2001
• Status: Active Grant

• Current Assignee: Terumo Kabushiki Kaisha
• Original Assignee: Terumo Kabushiki Kaisha
• Inventors: Ooyauchi, Tetsuya, Ueda, Mieko
• Granted Patent: US 7,252,653 B2
• Time in Patent Office: Days
• US Class Current: 604/272
• CPC Class Codes: A61M 5/3286 Needle tip design, e.g. for improved penetration
• CPC Class Codes: A61M 5/329 characterised by features of the needle shaft

Abstract

A liquid injection needle (10) includes a hollow needle part (2) for injecting a liquid (8) and a supporting part (3), to which the needle part (2) is fixed. The needle part (2) includes an anchoring part (22) that extends through the inside of the supporting part (3) and a puncturing part (21) that extends from the supporting part (3) for making a puncture in a living body. The puncturing part (21) has a distal side outer diameter equal to or greater than 0.1 mm and equal to or less than 0.25 mm, and a proximal side outer diameter than the distal side outer diameter.

Claims

1. A liquid injection needle comprising:

a hollow needle part for injecting a liquid;

a supporting part to which the needle part is fixed;

said needle part comprising an anchoring part that extends through an inside of said supporting part and a puncturing part that extends from said supporting part for making a puncture in a living body; and

said puncturing part having a distal side outer diameter equal to or greater than 0.1 mm and equal to or less than 0.25 mm, and a proximal side outer diameter than said distal side outer diameter.

2. The liquid injection needle as claimed in claim 1, wherein said proximal side outer diameter is equal to or greater than 0.3 mm and equal to or less than 2 mm.

3. The liquid injection needle as claimed in claim 1, wherein said puncturing part has a total length equal to or greater than 1.5 mm and equal to or less than 15 mm.

4. The liquid injection needle as claimed in claim 1, wherein said puncturing part consists of a distal end, a middle part and a proximal end, said distal end and said proximal end both having constant outer diameters over their entire lengths, and said middle part having an outer diameter that gradually reduces toward said distal end to smoothly connect said distal end and said proximal end.

5. The liquid injection needle as claimed in claim 1, wherein an outer diameter of said puncturing part gradually decreases from said supporting part toward a tip of said puncturing part.

6. The liquid injection needle as claimed in claim 1, wherein said puncturing part has a total length equal to or greater than 1.5 mm and equal to or less than 5 mm, and said distal side outer diameter is equal to or greater than 0.1 mm and equal to or less than 0.25 mm over a range that is {fraction (2/3)} or more of said total length.

7. The liquid injection needle as claimed in claim 1, wherein said puncturing part has a total length greater than 5 mm and equal to or less than 15 mm, and said distal side outer diameter is equal to or greater than 0.1 mm and equal to or less than 0.25 mm over a range that is {fraction (3/5)} or more of said total length.

8. The liquid injection needle as claimed in claim 1, wherein said liquid contains a drug that acts on a living body.

9. The liquid injection needle as claimed in claim 1, wherein said liquid is self-administered.

10. The liquid injection needle as claimed in claim 1, wherein the puncturing part possesses a sticking resistance equal to or less than 7 gram-force.

11. The liquid injection needle as claimed in claim 1, wherein said needle part possesses a flow path resistance equal to or less than 350 gram-force under a sustained water flow rate of 20 μ

l/sec.

19. A liquid injection device provided with said liquid injection needle as claimed in claim 1, comprising a main body having an internal space adapted to contain said liquid, said supporting part being provided at one end of the main body, said needle part of said liquid injection needle being fixed on said supporting part to communicate with said internal space.

20. The liquid injection device as claimed in claim 19, wherein said proximal side outer diameter is equal to or greater than 0.3 mm and equal to or less than 2 mm.

21. The liquid injection device as claimed in claim 19, wherein said puncturing part has a total length equal to or greater than 1.5 mm and equal to or less than 15 mm.

22. The liquid injection device as claimed in claim 19, wherein said puncturing part includes a distal end, a middle part and a proximal end, said distal end and said proximal end both having constant outer diameters over their entire lengths respectively, and said middle part having an outer diameter that gradually reduces toward said distal end to smoothly connect said distal end and said proximal end.

23. The liquid injection device as claimed in claim 19, wherein said puncturing part has an outer diameter that gradually decreases from said supporting part toward a tip of said puncturing part.

24. The liquid injection device as claimed in claim 19, wherein said puncturing part has a total length equal to or greater than 1.5 mm and equal to or less than 5 mm, and said distal side outer diameter is equal to or greater than 0.1 mm and equal to or less than 0.25 mm over a range that is {fraction (2/3)} or more of said total length.

25. The liquid injection device as claimed in claim 19, wherein said puncturing part has a total length greater than 5 mm and equal to or less than 15 mm, and said distal side outer diameter is equal to or greater than 0.1 mm and equal to or less than 0.25 mm over a range that is {fraction (3/5)} or more of said total length.

26. The liquid injection device as claimed in claim 19, wherein said liquid contains a drug that acts on a living body.

27. The liquid injection device as claimed in claim 19, wherein said liquid is self-administered.

28. The liquid injection device as claimed in claim 19, wherein said puncturing part possesses a sticking resistance equal to or less than 7 gram-force.

29. The liquid injection device as claimed in claim 19, wherein said needle part possesses a flow path resistance equal to or less than 350 gram-force under a sustained water flow rate of 20 μ

l/sec.

12. A liquid injection needle comprising:

a hollow needle part for injecting a liquid;

a supporting part to which the needle part is fixed;

said needle part comprising an anchoring part that extends through an inside of said supporting part and a puncturing part that extends from said supporting part for making a puncture in a living body,

said puncturing part having a proximal side outer diameter greater than a distal side outer diameter; and

said puncturing part having a sticking resistance equal to or less than 7 gram-force.

13. The liquid injection needle as claimed in claim 12, wherein said liquid contains a drug that acts on a living body.

14. The liquid injection needle as claimed in claim 12, wherein said liquid is self-administered.

15. The liquid injection needle as claimed in claim 12, wherein the needle part possesses a flow path resistance equal to or less than 350 gram-force under a sustained water flow rate of 20 μ

l/sec.

30. A liquid injection device provided with said liquid injection needle as claimed in claim 12, comprising a main body having an internal space adapted to contain said liquid, said supporting part being provided at one end of the main body, said needle part of said liquid injection needle being fixed on said supporting part to communicate with said internal space.

31. The liquid injection device as claimed in claim 30, wherein said liquid contains a drug that acts on a living body.

32. The liquid injection device as claimed in claim 30, wherein said liquid is self-administered.

33. The liquid injection device as claimed in claim 30, wherein said needle part possesses a flow path resistance equal to or less than 350 gram-force under a sustained water flow rate of 20 μ

l/sec.

16. A liquid injection needle comprising:

a hollow needle part for injecting a liquid;

a supporting part to which the needle part is fixed;

said needle part comprising an anchoring part extending through an inside of said supporting part and a puncturing part extending from said supporting part for making a puncture in a living body;

said puncturing part having a proximal side outer diameter greater than a distal side outer diameter; and

said needle part having flow path resistance equal to or less than 350 gram-force under a sustained water flow rate of 20 μ

l/sec.

17. The liquid injection needle as claimed in claim 16, wherein said liquid contains a drug that acts on a living body.

18. The liquid injection needle as claimed in claim 16, wherein said liquid is self-administered.

34. A liquid injection device provided with said liquid injection needle as claimed in claim 16, comprising a main body having an internal space adapted to contain said liquid, said supporting part being provided at one end of the main body, said needle part of said liquid injection needle being fixed on said supporting part to communicate with said internal space.

35. The liquid injection device as claimed in claim 34, wherein said liquid contains a drug that acts on a living body.

36. The liquid injection device as claimed in claim 34, wherein said liquid is self-administered.