An electrosurgical instrument includes a housing having a shaft attached thereto which connects a pair of first and second jaw members such that the jaw members are movable relative to one another to grasp tissue therebetween. The instrument also includes a four-bar handle assembly attached to the housing...http://www.google.com/patents/US20040249371?utm_source=gb-gplus-sharePatent US20040249371 - Vessel sealer and divider
