A bipolar electrosurgical instrument has opposable seal surfaces on its jaws for grasping and sealing vessels and vascular tissue. Inner and outer instrument members allow arcuate motion of the seal surfaces. An open lockbox provides a pivot with lateral support to maintain alignment of the lateral surfaces....http://www.google.se/patents/US7241296?utm_source=gb-gplus-sharePatent US7241296 - Bipolar electrosurgical instrument for sealing vessels
