In the present invention, a surgical trocar is adapted to capacitively couple electrosurgical energy to specially adapted cordless electrosurgical instruments. In one embodiment of the present invention, an electrosurgical trocar includes a cannula, a capacitive electrosurgical adapter and a locking...http://www.google.com.au/patents/US6106519?utm_source=gb-gplus-sharePatent US6106519 - Capacitively coupled electrosurgical trocar
