LANCET HAVING A GROUND TIP AND METHOD FOR PRODUCING

• US 20090204138A1
• Filed: 02/03/2009
• Published: 08/13/2009
• Est. Priority Date: 08/05/2006
• Status: Abandoned Application

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Inventors: Weiss, Thomas
• Application Number:
  US12/364,859
• Publication Number:
  US 20090204138A1
• 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 5/150282 for piercing elements, e.g. blade, lancet, canula, needle
• CPC Class Codes: A61B 5/150419 comprising means for capillary action
• 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

Abstract

A lancet made of lancet wire having a ground tip. The lancet has a first ground face and a further ground face, which are located at a defined angle relative to one another, the length of the lancet being at most 16 mm. Also disclosed is a method for producing lancets for taking blood for medical-analytical purposes, which have at least one ground face that is generated in a grinding procedure. A lancet wire is positioned using a positioning device in a defined grinding position relative to a grinding element of a grinding device, and the following method steps are performed in this sequence: drawing off the lancet wire from a roll and transporting it into the positioning device; fixing or securing the lancet wire in the positioning device; grinding the free end of the lancet wire using the grinding device to generate at least one ground face; and cutting off the free end of the lancet wire in a cutting position to form a lancet having a defined length.

Claims

5. A lancet for sampling blood for medical-analytical purposes, comprising:

a ground tip formed from lancet wire;

the ground tip comprising a main ground face and two cutting faces, the main ground face forming an angle γ

with each cutting face of between 155° and

165°

; and

wherein, the length of the lancet is at most 16 mm.

6. The lancet of claim 5, wherein the cutting faces enclose an angle γ

′

which is between 130° and

150°

.

7. The lancet of claim 5, wherein the main ground face is located opposite to the two cutting faces, wherein the main ground face forms an angle Δ

with each cutting face of less than 90°

.

8. The lancet of claim 5, wherein the main ground face is located opposite to the two cutting faces, wherein the main ground face forms an angle Δ

with each cutting face of less than 20°

.

9. The lancet of claim 5, wherein the cutting faces enclose an angle Δ

′

which is between 120° and

160°

.

10. A method for producing lancets of the type having a ground face, comprising:

(a) drawing a lancet wire from a supply and transporting the lancet wire into a positioning device;

(b) positioning the lancet wire in the positioning device in a defined grinding position relative to a grinding element of a grinding device;

(c) securing the lancet wire in the positioning device;

(d) grinding the free end of the lancet wire with the grinding device and thereby generating the ground face; and

(e) cutting off the free end of the lancet wire in a cutting position to form a lancet having a defined length.

1. A lancet for sampling blood for medical-analytical purposes, comprising:

a ground tip formed from lancet wire;

the ground tip comprising a first ground face and a further ground face located at a defined angle relative to one another; and

wherein, the length of the lancet is at most 16 mm.

2. The lancet of claim 1, wherein the length of the lancet is at most 12 mm.

3. The lancet of claim 1, wherein the length of the lancet is at most 10 mm.

4. The lancet of claim 1, wherein the length of the lancet is at most 5 mm.

11. The method of claim 10, further comprising, after the step of grinding the free end of the lancet:

repositioning the lancet wire in the positioning device; and

again grinding the free end of the lancet, thereby generating a second ground face, the ground face and the second ground face being oriented at a defined angle relative to one another.

12. The method of claim 11, further comprising rotating the lancet wire between the step of grinding the free end of the lancet and again grinding the free end of the lancet.

13. The method of claim 12, wherein the rotating has an axial rotational component.

14. The method of claim 11, further comprising changing the angle of inclination between the free end of the lancet wire in relation to a grinding face of a grinding element between the step of grinding the free end of the lancet and the step of again grinding the free end of the lancet.

15. The method of claim 11, further comprising securing the lancet wire in a rotation element of the positioning device and rotating the lancet wire around its longitudinal axis between the grinding step and the again grinding step.

16. The method of claim 15, wherein at least a part of the rotation element is segmented into at least three segments in the longitudinal direction of the lancet wire and the lancet wire is fixed in the direction of the longitudinal axis of the lancet wire by compressing the segments.

17. The method of claim 15, further comprising cutting off the lancet wire at a position between the rotation element and the ground tip of the lancet wire.

18. The method of claim 15, further comprising cutting off the free end of the lancet wire while the lancet wire is fixed in the rotation element.

19. The method of claim 11, wherein, in at least one of the grinding procedures, the angle of inclination between a grinding face of a grinding element and the longitudinal axis of the lancet wire is between 5°

and 10°

.

20. The method of claim 19, wherein, in the other grinding procedure, the angle of inclination between the grinding face and the longitudinal axis of the lancet wire is between 15°

and 25°

.

21. The method of claim 10, further comprising supporting the free end of the lancet wire with a support element during the grinding.

22. The method of claim 10, further comprising positioning and securing a plurality of lancet wires adjacent to one another in the positioning device in a plane running transversely to the longitudinal direction of free ends of the lancet wires.

23. The method of claim 22, further comprising moving the grinding element during a grinding procedure such that the free ends of the plurality of lancet wires secured in the positioning device are ground in sequence during the movement.

24. The method of claim 22, wherein the free ends of the plurality of lancet wires are ground simultaneously by the grinding element.

25. The method of claim 10, wherein the free end of the lancet wire is cut off such that the length of the resulting lancet from its tip to the cutting point is at most 16 mm.

26. The method of claim 10, wherein the free end of the lancet wire is cut off using a chopping blade, a cutting blade, a cutting disk, or a laser.

27. The method of claim 10, further comprising, between the step of grinding the free end of the lancet and again grinding the free end of the lancet, rotating the free end of the lancet wire by a defined angle of rotation in a range from 90°

to 270°

.

28. The method of claim 27, further comprising, between the step of grinding the free end of the lancet and again grinding the free end of the lancet, rotating the free end of the lancet wire by a defined angle of rotation in a range from 150°

to 210°

.

29. The method of claim 27, further comprising, between the step of grinding the free end of the lancet and again grinding the free end of the lancet, rotating the free end of the lancet wire by a defined angle of rotation in a range from 190°

to 200°

.

28-1. The method of claim 27, further comprising, between the step of grinding the free end of the lancet and again grinding the free end of the lancet, rotating the free end of the lancet wire by a defined angle of rotation in a range from 160°

to 170°

.