These and other objects of the present invention are achieved in a body fluid sampling system for use on a tissue site that includes an electrically powered drive force generator. A penetrating member is operatively coupled to the force generator. The force generator moves the member along a path out...http://www.google.com.au/patents/US20070173742?utm_source=gb-gplus-sharePatent US20070173742 - Method and apparatus for penetrating tissue
