Patent ID: 8317813
Filing Date: 2012-11-27
Classification: A61B

Abstract:
1. A device for acquiring a blood sample, the device comprising: a lancet for piercing into skin of a body part in a controlled forward and back movement and for subsequently and immediately, partially retracting in order to receive blood exiting from the piercing; a puncture drive comprising a drive rod coupled to the lancet and a drive spring acting in a direction of a piercing axis of the lancet, wherein the drive spring is situated coaxially around the drive rod; a control unit for controlling the piercing and retraction of the lancet according to a predetermined movement profile comprising at least one rapid propulsion phase, in which the lancet pierces up to a predetermined maximum piercing depth, and a rapid retraction phase, in which the lancet is partially retracted to a predetermined residual piercing depth; a rotatable mounted flywheel, wherein a rotational axis of the flywheel is laterally offset from the piercing axis of the lancet; and a coupling element for coupling the flywheel to the drive rod in such a manner that the propulsion phase of the lancet sets the flywheel into motion and, after reaching the maximum piercing depth, movement energy stored in the flywheel causes the retraction of the lancet.