Patent ID: 7563232

Claim:
A body fluid sampling system for use on a tissue site, the system comprising: an electrically powered drive force generator; a penetrating member operatively coupled to said drive force generator, said drive force generator moving said penetrating member along a path out of a housing having a penetrating member exit, into said tissue site, stopping in said tissue site, and withdrawing out of said tissue site; a sample chamber positioned to receive fluid from a wound created by said penetrating member, the sample chamber including an analyte detecting member and having a volume no greater than 1 μL, the sample chamber being positioned to receive fluid from a wound created by said penetrating member, the penetrating member and sample chamber being integrated in a single device, the penetrating member and sample chamber having a combined packing density of no more than 5.0 cm3; and a user interface configured to relay at least one of, penetrating member performance or a penetrating member setting, a position sensor coupled to a processor and the electrically powered drive force generator, the processor having control a algorithm that provides an input to the drive force generator of a real time measurement of a penetrating member depth of penetration in the tissue site, wherein the real time measurement drives the penetrating member to a numerical depth that has been set through a feedback control system in response to a tissue site cutting parameter selected from at least one of, velocity of the penetrating member into or out of the tissue site, a desired velocity profile of the penetrating, dwell time of the penetrating member into tissue site, a force delivered on the tissue site by the penetrating member, information relative to contact of the penetrating member with the tissue site before penetration by the penetrating member, and information relative to a change of velocity of the penetrating member as in travels in and through the tissue site.