Patent ID: 7273484

Claim:
A Blood withdrawal system for withdrawing blood for diagnostic purposes, the system comprising: a housing, wherein a lancet can be moved within the housing along a pre-determined puncturing path to perform a puncturing motion; and a lancet drive with a drive spring and a cocking mechanism; wherein the cocking mechanism includes an actuation element, wherein the actuation element is coupled by an input-side coupling mechanism to the drive spring, said input-side coupling mechanism effecting a transmission of force from the actuation element to the drive spring, such that the drive spring is tensioned when the actuation element is moved during a cocking phase of the lancet drive; wherein the drive spring is coupled by an output-side coupling mechanism to the lancet, said output-side coupling mechanism effecting a transmission of force from the drive spring to the lancet, such that the lancet during a drive phase of the lancet drive, is driven by the relaxing motion of the drive spring at a high speed along the pre-determined puncturing path to perform the puncturing motion to generate a wound; and wherein the actuation element is coupled to a track control mechanism, said track control mechanism being additional to the input-side coupling mechanism effecting the transmission of force from the actuation element to the drive spring and additional to the output-side coupling mechanism effecting the transmission of force from the drive spring to the lancet, the track control mechanism comprising a control track part and a control traveler, wherein the control traveler performs a relative motion with respect to the control track part during at least a part of the cocking phase, in which the control traveler travels along a control track of the control track part, wherein at least a part of the motion of the lancet dive is controlled.