Method and system for withdrawing body fluid

Patent metadata

Field	Value
Publication number	US-9414774-B2
Application number	US-53967506-A
Country	US
Kind code	B2
Filing date	Oct 9, 2006
Priority date	Apr 10, 2004
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A system and method for carrying out the withdrawal of body fluid with as little body fluid as possible visible to the user at the end of the process. The present invention provides a pressure piece for exerting pressure on a body part. The pressure piece is moved relative to a support for the body part, and in the final phase of fluid withdrawal, the compressive or resistive force of the pressure piece on the body part is reduced in order to avoid the escape of body fluid from the puncture site. The support results in a defined positioning of the body part that rests against it for the lancing process, whereas the relative movement of the pressure piece enables an additional increase in pressure and thus an improved collection of fluid.

First claim

What is claimed is:

1. A method of using an analytical instrument for withdrawing blood from a body part, comprising:
moving a pressure piece relative to a support which contacts the body part to exert pressure on the body part with the pressure piece;
inserting a lancing member into the body part, wherein the lancing member includes a capillary to collect blood;
withdrawing blood through the capillary with a collecting unit;
using the analytical instrument to reduce the compressive force of the pressure piece on the body part to avoid forming a drop of blood on the skin surface of the body part.

2. The method of claim 1 , wherein the reducing the compressive force takes place in the final phase of fluid withdrawal.

3. The method of claim 1 , wherein the lancing member is removed from the body part during or after the pressure reduction.

4. The method of claim 1 , further comprising pressing the body part against the pressure piece, wherein the pressure piece is moved towards the support against a resisting force.

5. The method of claim 1 , wherein a positioning drive moves the pressure piece towards or away from the body part.

6. The method of claim 1 , wherein the compressive force of the pressure piece is lowered by relaxing a pretensioning element comprising a pretensioned spring acting against the pressure piece.

7. The method of claim 1 , wherein the compressive force of the pressure piece is regulated by a force element.

8. The method of claim 1 , wherein the pressure piece is moved away from the body part at the end of fluid withdrawal.

9. The method of claim 1 , wherein the pressure piece is retracted through an opening of the support into a position that is screened from contact by the body part in order to reduce the pressure.

10. The method of claim 1 , wherein the pressure piece delimits a free puncture area for the lancing member.

11. The method of claim 1 , wherein the compressive force exerted by the pressure piece is controlled as a function of the amount, rate, or duration of fluid withdrawal.

12. A method of using an analytical instrument for withdrawing blood from a body part, comprising:
moving a pressure piece relative to a support which contacts the body part to exert pressure on the body part with the pressure piece;
inserting a lancing member into the body part to create a puncture;
withdrawing blood with a collecting unit;
controlling the compressive force exerted by the pressure piece on the body part for a defined withdrawal of blood and thereafter using the analytical instrument to reduce the compressive force exerted by the pressure piece in a permanent manner without increase; and then
moving the lancing member away from the body part with substantially no blood being visible on the skin surface near the puncture.

13. The method of claim 12 , wherein the control occurs by one of a user-defined presetting for the withdrawal duration, a detection of the collected volume, or of the actual flow rate of the body fluid.

14. The method of claim 12 , further comprising generating a release signal to activate the lancing process when the pressure piece reaches a preset position or when the support is touched.

15. The method of claim 12 , further comprising generating a release signal to activate the lancing process when the pressure piece or the support is in a stop position.

16. The method of claim 12 , wherein the lancing member is inserted to a defined lancing depth into the body part and then is retracted into a collecting position at a smaller lancing depth.

17. The method of claim 12 , further comprising coupling a detection unit with the collecting unit to analyse the body fluid.

18. The method of claim 12 , further comprising transporting the body fluid by a capillary transport channel of the collecting unit.

19. The method of claim 12 , further comprising selecting the pressure piece from a plurality of different pressure pieces, wherein the method is adapted to the anatomy of the body part.

20. The method of claim 12 , further comprising bulging or stretching the body part in a puncture area under the pressure of the pressure piece.

21. A system for withdrawing blood from a body part, comprising:
a pressure piece configured to apply pressure to a body part and having an actuator operably connected thereto;
a lancing member configured for insertion into the body part and including a capillary to collect blood;
a support configured to contact the body part;
a collecting unit to withdraw blood; and
the pressure piece being movable relative to the support in order to exert pressure on the body part, wherein the actuator is configured to reduce the compressive force of the pressure piece in a permanent manner without increase after removing an amount of blood, whereby substantially no blood is visible on a skin surface near a puncture created by the lancing member after the lancing member is retracted from the body part.

22. The system of claim 21 , wherein the lancing member is formed on the collecting unit.

23. The system of claim 21 , wherein the pressure piece is configured to be moved towards the support against a restoring force of the actuator by pressing the body part against the pressure piece.

24. The system of claim 21 , wherein the actuator comprises a pretensioning element that further comprises a spring resting under pretension against the pressure piece.

25. The system of claim 21 , wherein the actuator comprises a movable support to relax the pretensioning element.

26. The system of claim 21 , wherein the actuator comprises a curve-controlled positioning drive for the movement of the pressure piece.

27. The system of claim 21 , wherein the support comprises a positioning surface to which to apply the body part, the positioning surface being provided with an opening for the passage of the pressure piece.

28. The system of claim 21 , wherein the pressure piece is formed as a ring and the lancing member is configured to be lanced through an opening in the ring into the body part.

29. The system of claim 21 , wherein the pressure piece is formed by at least one bar configured to press down on the body part linearly or by a strut configured to press down on the body part in a punctiform manner.

30. The system of claim 21 , wherein the pressure piece is elastically deformable.

31. The system of claim 21 , further comprising a signal generator that is activated when a preset position is reached or when the support or the pressure piece is touched or reaches a stop position in order to generate a release signal for the activation of the lancing member.

32. The system of claim 21 , wherein the collecting unit is operatively connected with a detection unit configured to analyze the body fluid.

33. The system of claim 21 , wherein the collecting unit comprises a capillary transport channel to transport the body fluid.

34. A method of withdrawing blood from a body part with a device of the type having a housing, a lancing opening formed in the housing and which defines a support for the body part, a lancing member which is extendable through the lancing opening during operation of the device, and a movable pressure piece positioned adjacent the opening, the method comprising:
arranging the pressu

Assignees

• Korner Stephan
• Jaeggi Rainer
• Griss Patrick
• Sarofim Emad
• Calasso Irio Guiseppe
• Roche Diabetes Care Inc

Inventors

• Korner Stephan
• Jaeggi Rainer
• Griss Patrick
• Sarofim Emad
• Calasso Irio Guiseppe

Classifications

• A61B5/150816

  by tactile feedback, e.g. vibration · CPC title

• A61B5/150358

  Strips for collecting blood, e.g. absorbent · CPC title

• A61B5/150022

  for capillary blood or interstitial fluid · CPC title

• A61B5/150068 Primary

  by tissue compression, e.g. with specially designed surface of device contacting the skin area to be pierced · CPC title

• A61B5/1411 Primary

  by percutaneous method, e.g. by lancet · CPC title