In various embodiments, a surgical stapling instrument can comprise a plurality of magnetic elements configured to articulate an end effector of the surgical instrument. The surgical instrument can comprise at least one electromagnet which can be selectively activated, or polarized, to generate a magnetic...http://www.google.co.uk/patents/US20100193567?utm_source=gb-gplus-sharePatent US20100193567 - SURGICAL STAPLING INSTRUMENT COMPRISING AN ARTICULATION JOINT
