Provided is an analyte monitoring device having a housing, the device comprising: a plurality of needles, each having a tip, a retracted position, a position wherein the tip is extended from the housing a distance adapted to pierce skin; an electrically or spring powered needle pushing apparatus movable...http://www.google.es/patents/US6923764?utm_source=gb-gplus-sharePatente US6923764 - Analyte monitor
