BLOOD WITHDRAWAL SYSTEM

• US 20080033469A1
• Filed: 08/02/2007
• Published: 02/07/2008
• Est. Priority Date: 08/02/2006
• Status: Abandoned Application

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Inventors: Winheim, Sven, Dopper, Joachim, Thoes, Bruno
• Application Number:
  US11/832,864
• Publication Number:
  US 20080033469A1
• 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 5/150412 Pointed piercing elements, e.g. needles, lancets for piercing the skin blade-like piercing elements A61B5/150442
• 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 5/15117 comprising biased elements, resilient elements or a spring, e.g. a helical spring, leaf spring, or elastic strap
• CPC Class Codes: A61B 5/15128 comprising 2D- or 3D-shaped elements, e.g. cams, curved guide rails or threads comprising tooth-shaped elements A61B5/15132
• CPC Class Codes: A61B 5/1519 comprising driving means, e.g. a spring, for propelling the piercing unit
• CPC Class Codes: A61B 5/15194 fully automatically retracted, i.e. the retraction does not require a deliberate action by the user, e.g. by terminating the contact with the patient's skin

Abstract

A blood withdrawal system for producing blood from a body part for diagnostic purposes, comprising a housing with a lancet guide capable of guiding a lancet on a predetermined puncturing path and a lancet drive for driving a puncturing movement of a lancet on the predetermined path. The lancet drive comprises a drive rotor driven by a drive spring and rotates about an axis during the puncturing movement, and a coupling mechanism which converts the rotational movement of the drive rotor into a puncturing movement, wherein the lancet is moved during a forward phase of the puncturing movement in the puncturing direction until its tip penetrates into the body part to create a wound and is retracted from the skin during a retraction phase of the puncturing movement. The coupling mechanism includes a translation element coupled to the lancet and guided by a guide on a movement path.

Claims

1. A blood withdrawal system for producing blood from a body part for diagnostic purposes, comprising:

a housing;

a drive rotor capable of rotating about an axis, the drive rotor including a control element including a center and a control surface encompassing the center, the control element orientated radially outward from the center; and

a coupling mechanism including a translation element having at least two guide walls each including a contact surface, the translation element coupled to a lancet and guided by a guide on a translational movement path;

wherein during a puncturing movement, the control element rotates with the drive rotor about an axis of rotation spaced apart from the center of the control element and the control surface of the control element is in contact with the contact surfaces of at least one of the guide walls of the translation element during the rotation of the drive rotor such that the movement of the translation element is controlled by the drive rotor at least during a portion of the forward phase and at least during a portion of the retraction phase of the puncturing movement.

2. The blood withdrawal system according to claim 1 wherein the axis of rotation extends through a boundary defined by the control surface of the control element.

3. The blood withdrawal system according to claim 1 wherein the control element is formed by a circumferential wall of the drive rotor.

4. The blood withdrawal system according to claim 1 wherein the axis of rotation is located outside of the control surface of the control element.

5. The blood withdrawal system according to claim 1 wherein the control element revolves during rotation of the drive rotor on a circular path about the axis of rotation.

6. The blood withdrawal system according to claim 1 wherein the control element is a pin.

7. The blood withdrawal system according to claim 1 wherein the control element is in contact with the two contact surfaces of the guide walls of the translational element during at least half of the puncturing movement so that each position of the control element corresponds to the position of the translation element and the lancet.

8. The blood withdrawal system according to claim 1 wherein one contact surface of one of the guide walls of the translation element is oriented in the direction of the puncturing movement and another contact surface of another of the guide walls of the translation element is oriented in the direction opposite the puncturing direction.

9. The blood withdrawal system according to claim 1 wherein the contact surfaces of the guide walls of the translation element are located in a plane perpendicular to the axis of rotation.

10. The blood withdrawal system according to claim 1 wherein the contact surfaces are oriented essentially perpendicular to the puncturing direction of the lancet.

11. The blood withdrawal system according to claim 1 wherein at least the contact surfaces of the translation element that contact the control element are manufactured from a material including polytetrafluoroethylene.

12. The blood withdrawal system according to claim 1 wherein the guide comprises a plurality of guide rails.

13. The blood withdrawal system according to claim 1 wherein the guide comprises a guide cylinder.

14. The blood withdrawal system according to claim 1 wherein the translation element is a cage encompassing at least a portion of the control element.

15. The blood withdrawal system according to claim 1 wherein the translational element is coupled to the lancet in a manner allowing the translational element to propel the lancet in the puncturing direction.

16. The blood withdrawal system according to claim 14 wherein the translational element is coupled to the lancet in a manner allowing the translational element to move the lancet in a direction substantially opposite the puncturing direction.

17. A blood withdrawal system including:

a housing including an opening;

a lancet at least partially located in the housing and capable of extending at least partially through the opening;

a mechanism coupled to the lancet in a manner allowing the mechanism to drive the lancet in at least two directions, the mechanism including a first wall and a second wall spaced apart from the first wall defining a gap; and

an assembly including a surface at least partially located within the gap, the surface configured to contact at least one of the walls of the mechanism;

wherein the surface exerts a force against one of the walls in order to drive the lancet in a first direction.

18. The blood withdrawal system as set forth in claim 17 wherein the assembly further includes a rotor and the surface is connected to the rotor.

19. The blood withdrawal system as set forth in claim 18 wherein the surface is located on the rotor.

20. The blood withdrawal system as set forth in claim 17 wherein the rotor is at least partially located within the gap.

21. The blood withdrawal system as set forth in claim 17 wherein the rotor contacts both the first wall of the mechanism and the second wall of the mechanism.

22. The blood withdrawal system as set forth in claim 17 wherein the rotor includes a center and a rotation axis, and the center is spaced apart from the axis.

23. The blood withdrawal system as set forth in claim 17 wherein rotation of the rotor in a first direction propels the lancet in a first direction and rotation of the rotor in a second direction propels the lancet in a second direction opposite the first direction.

24. The blood withdrawal system as set forth in claim 17 wherein the mechanism includes a pair of side walls connecting the first wall to the second wall.

25. The blood withdrawal system as set forth in claim 17 wherein the assembly further includes an arm and an element comprising the surface, the arm connecting the element to the rotor.

26. The blood withdrawal system as set forth in claim 25 wherein the element is at least partially located within the gap.

27. The blood withdrawal system as set forth in claim 26 wherein the rotor includes a center about which it rotates and rotation of the rotor in a first direction results in the lancet moving in a first direction.

28. The blood withdrawal system as set forth in claim 26 wherein the rotor can rotate between a first position and a second position and the rotation of the rotor from the first position to the second position results in the lancet traveling in a first direction until the rotor reaches a midpoint of rotation and the lancet traveling in a second direction until the rotor reaches the second position.

29. The blood withdrawal system as set forth in claim 25 wherein the element is a pin.

30. The blood withdrawal system as set forth in claim 17 wherein the mechanism further includes a guide member and a guide element including an aperture and the guide member extends through the aperture of the guide element.

31. The blood withdrawal system as set forth in claim 30 wherein the mechanism further includes a second guide member and a second guide element including an aperture and the second guide member extends through the aperture of the second guide element.

32. The blood withdrawal system as set forth on claim 31 wherein the assembly is at least partially located between the guide elements.

33. The blood withdrawal system as set forth in claim 17 wherein the surface is in contact with the first wall and the second wall.