Electric lancet actuator

  • US 8,721,671 B2
  • Filed: 07/06/2005
  • Issued: 05/13/2014
  • Est. Priority Date: 06/12/2001
  • Status: Active Grant
First Claim
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1. A body fluid sampling system with an electric penetrating member actuator in a flat stationary housing for advancing a penetrating member, comprising:

  • an electronic drive force generator that includes a plurality of coils;

    a penetrating member coupled to the electronic drive force generator;

    a flat magnetically permeable flag attached at proximal or drive end of the penetrating member moveable in the flat stationary housing, wherein the flat magnetically permeable flag increases the surface area of the penetrating member to enhance electromotive forces generated between the proximal end of the penetrating member and the plurality of coils, the flag including a metal core;

    the electronic drive force generator being coupled to position feedback to control power delivered to the electric powered drive force generator and control velocity and displacement profiles of the penetrating member to compensate for variation in skin thickness and variations in skin deformation when a penetrating member is driven through the skin when sampling body fluid; and

    circuitry for controlling current to the plurality of coils, the circuitry providing an electronic stop for the penetrating member after it has pierced the skin, wherein subsets of said plurality of coils are selectively activated in sequence to move the metal core, which in turn causes the electronic drive force generator to move the penetrating member at a faster rate into a tissue site and a slower rate out of the tissue site to provide a spontaneous blood flow and yield at least a 70-80% success rate in obtaining a blood sample, the circuitry providing for an ability to control depth of penetration and penetrating member speed into and out of the tissue site to allow for compensation for changes in skin thickness, the circuitry in operation phasing power of the coils, with a moving field being generated that pushes a flag along just below a synchronous speed of the coils, wherein controlling a rate of sweep, and generating multiple sweeps, the flag can be moved at a desired speed.

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