System for withdrawing blood

Patent metadata

Field	Value
Publication number	US-10617340-B2
Application number	US-201715804352-A
Country	US
Kind code	B2
Filing date	Nov 6, 2017
Priority date	Oct 31, 2000
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

The present invention includes a system for withdrawing body fluids. The system includes a drive unit having a plunger which is moved from a resting position into a lancing position in order to carry out a lancing process and a lancing unit containing a lancet with a needle. The plunger and lancet are coupled together by a form fit in order to carry out a lancing process. The invention additionally concerns a method for temporarily extending a needle from a device for withdrawing body fluid as well as a lancing unit that can be attached to the drive unit.

First claim

The invention claimed is:

1. Lancet comprising a needle and a needle tip wherein the needle tip is embedded in an elastomer before a puncture and wherein the elastomer is pierced by the needle during a puncture process in order to free the needle tip, wherein the lancet is used for withdrawal of blood, characterized in that the elastomer remains on the needle when the lancet is at a fully retracted position and the needle tip is exposed at the fully retracted position.

2. The lancet according to claim 1 , characterized in that the elastomer tightly surrounds the needle tip.

3. The lancet according to claim 1 , characterized in that the elastomer is selected from the group comprising styrene-oligoblock copolymers, thermoplastic polyolefins, thermoplastic polyurethanes, thermoplastic copolyesters and thermoplastic copolyamides.

4. The lancet according to claim 1 , characterized in that it has a base body made of plastic in which a metal needle is located.

5. The lancet according to claim 1 , characterized in that it has a holding device with holding elements to make a form-fitting connection with a plunger of a drive unit.

6. Lancing unit comprising at least one lancet according to claim 1 as well as a housing in which the at least one lancet is arranged in a resting position.

7. System for withdrawing blood, comprising:
a drive unit having a plunger which is moved from a resting position into a lancing position in order to carry out a lancing process and
a lancing unit according to claim 6 in which a lancet with a needle is located, where said lancet is arranged within the lancing unit in the resting position of the plunger and is displaced by the plunger when it moves into the lancing position in such a manner that the needle at least partially emerges through an exit opening in the lancing unit.

8. The system according to claim 7 , characterized in that the plunger and lancet are coupled together by a form fit in order to carry out the lancing process.

9. The system according to claim 7 , characterized in that the plunger has a holding area which is held in a form fitting manner on the lancet by a holding device.

10. The system according to claim 7 , in which the lancing unit is detachably attached to the drive unit.

11. The system according to claim 7 , which has a magazine containing a plurality of the lancets which can be successively coupled to the plunger of the drive unit.

12. The system according to claim 7 , wherein:
the lancet includes at least one holding element configured to move transversely to a direction the plunger moves in order to carry out the lancing process; and
the plunger and the holding element are decoupled when at the resting position.

13. The system according to claim 12 , further comprising:
a sleeve in which the lancet is disposed; and
wherein the holding element has a shoulder configured to retain the needle tip within the sleeve when the lancet is retracted and the needle tip is exposed.

14. The lancing unit according to claim 6 , characterized in that the lancing unit contains a sleeve in which the lancet is movably located.

15. The lancing unit according to claim 14 , characterized in that an underside of the sleeve has a plate with a central opening wherein the plate prevents the elastomer from emerging through the opening so that the said elastomer is pierced when the needle emerges through the central opening.

16. Method for temporarily extending a needle out of a device for withdrawing blood wherein the needle has a needle tip which is embedded in an elastomer before a puncture, comprising:
carrying out the puncture during which the elastomer is pierced by the needle and
retracting a lancet to a fully retracted position during which the elastomer remains on the needle and the needle tip is exposed in the fully retracted position.

17. The method according to claim 16 , comprising:
coupling the lancet to a plunger of a drive unit in a form-fitting manner, wherein either the plunger has a holding area and the lancet has a holding, device or the lancet has a holding area and the plunger has a holding device,
moving the plunger from a resting position in which the needle of the lancet is arranged within a lancing unit into a position in which the needle emerges from an exit opening of the lancing unit, and
retracting the plunger in order to pull the needle back into the lancing unit.

18. Method for temporarily extending a needle from a device for withdrawing blood, comprising:
coupling a lancet to a plunger of a drive unit in a form-fitting manner where either the plunger has a holding area and the lancet has a holding device or the lancet has a holding area and the plunger has a holding device,
moving the plunger from a resting position in which the needle of the lancet is located inside a lancing unit into a position in which the needle emerges from an exit opening of the lancing unit, wherein at least one holding element of the holding device is moved transversely to a longitudinal direction by means of a longitudinal movement of the holding device during said moving the plunger from the resting position such that at least one holding element at least partially closes around the holding area, and
moving the plunger back in order to retract the needle into the lancing unit.

19. The method as claimed in claim 18 , in which the lancet is coupled to the drive unit by attaching the lancing unit to the drive unit.

20. The method as claimed in claim 18 , in which the lancet and plunger are disconnected by removing the lancing unit from the drive unit.

21. The method as claimed in claim 18 , wherein:
the lancet has a needle with a needle tip which is located in an elastomer before a puncture;
said moving the plunger from the resting position includes carrying out the puncture during which the elastomer is pierced by the needle; and
said moving the plunger back includes retracting the lancet during which the elastomer remains on the needle and the needle tip is exposed.

22. The method as claimed in claim 21 , further comprising:
wherein the holding device includes at least one holding element; and
coupling the holding element with the holding area by moving the holding element in a transverse direction during said moving the plunger from the resting position.

23. The method as claimed in claim 22 , further comprising:
decoupling the holding element from the holding area after said moving the plunger back; and
retaining the needle tip in the lancing unit by engaging a shoulder of the holding element with the lancing unit.

Assignees

• Roche Diabetes Care Inc

Inventors

• Fritz Michael
• Sacherer Klaus-Dieter
• List Hans
• Weiss Thomas
• Deck Frank
• Immekus Claudio

Classifications

• A61B5/15113

  Manually triggered, i.e. the triggering requires a deliberate action by the user such as pressing a drive button · CPC title

• A61B5/1519

  comprising driving means, e.g. a spring, for propelling the piercing unit · CPC title

• A61B5/150717

  manually removed · CPC title

• A61B5/150022

  for capillary blood or interstitial fluid · CPC title

• A61B5/150412

  Pointed piercing elements, e.g. needles, lancets for piercing the skin (blade-like piercing elements A61B5/150442) · CPC title