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AssigneeConmed Corporation
InventorsJohn S. Gentelia, Frank Williams, William C. Wheatley, Ernesto G. Sevilla, Sharyn Longo, Deborah Forbey
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A trocar assembly includes an elongate trocar device and a surrounding cannula. The trocar device incorporates an electrosurgical cutting element which is used to make a guide hole for the cannula and thus enables the remainder of the trocar assembly to enlarge the puncture. An electronic control circuit senses the current flow to the cutting element and, when the trocar device breaks through the wall of the organ being cut, this circuit cuts off the connection to the associated electrosurgical generator. Further control circuitry prevents a surgeon from resuming electrosurgery until a predetermined time period has elapsed. Multiple trocars of different diameters are provided for the same assembly.
A trocar assembly comprising a first trocar comprising a first elongate trocar shaft, of a first outer diameter, including a first tapered surface at the distal end and an electrosurgical cutting element comprising a central conductive rod extending along the longitudinal axis of the first shaft, said rod terminating in a distal end extending beyond said first tapered surface and being adapted to be connected to an electrosurgical generator;
A trocar system comprising a trocar device including an electrosurgical cutting element having a distal end, a cannula surrounding said trocar device, means for connecting said cutting element of said trocar device to an electrosurgical generator for supplying power to said cutting element, and sensing means for sensing an electrical parameter which varies in response to penetration of at least a part of said cutting element through the wall of a body cavity of a patient undergoing electrosurgery and for, responsive to a variation in said parameter indicative of said penetration, interrupting the power supplied to the cutting element by the electrosurgical generator.
A trocar assembly comprising a trocar device including an electrosurgical cutting element adapted to be connected to an electrosurgical generator, a control switch for, in a first position thereof, providing completion of a connection between the electrosurgical generator and the electrosurgical cutting element and for, in a second position thereof, providing interruption of said connection, and circuit means for, responsive to interruption of said power by said control switch, preventing power from being supplied to said electrosurgical cutting element during a predetermined time period independently of whether said control switch is in the first position thereof.
A trocar assembly comprising:
A trocar assembly comprising:
A trocar assembly comprising an elongate trocar device and a cannula surrounding said trocar device, said trocar device comprising an electrosurgical cutting element comprising a rod terminating in a blunt distal end, said cutting element being adapted to be connected to an electrosurgical generator, and said trocar assembly further comprising a control switch for, in a first position thereof, providing completion of a connection between the electrosurgical generator and the electrosurgical cutting element and for, in a second position thereof, providing interruption of said connection, and circuit means for, responsive to interruption of said power by said control means, preventing power from being supplied to said electrosurgical cutting element during a predetermined time period independently of whether said control switch is in the first position thereof.
An electrosurgical trocar assembly comprising a cannula and a trocar device disposed within said cannula, said trocar device comprising a central, longitudinally extending, cylindrical conductive rod of a first diameter terminating in a blunt distal end of gradually decreasing diameter from said first diameter, an insulating trocar shaft surrounding said rod and providing a surface of a tapered profile;
Dependencies are inferred from the claim text.