Surgical system
An electrosurgical instrument includes a hand piece, an electrode assembly comprising one or more electrodes attached to the hand piece, and connection means for connecting the hand piece to an electrosurgical generator. The hand piece comprises a housing, fluid supply lines for directing a cooling fluid to and from the electrode assembly, and a pump for driving cooling fluid through the fluid supply lines. An electrosurgical cutting blade comprises a first electrode, a second electrode, and an electrical insulator separating the first and second electrodes. The first and second electrode have dissimilar characteristics, such that the first electrode is encouraged to become an active electrode and the second electrode is encouraged to become a return electrode. In use, a thermal differential is established between the first and second electrodes, either by thermally insulating the second electrode from the first electrode, and/or by transferring heat away from the second electrode.
1 . An electrosurgical instrument comprising a handpiece, an electrode assembly comprising one or more electrodes attached to the handpiece, and connection means for connecting the handpiece to an electrosurgical generator, the handpiece comprising a housing, fluid supply lines for directing a cooling fluid to and from the electrode assembly, and a pump for driving cooling fluid through the fluid supply lines, the pump and the fluid supply lines both being wholly contained within the housing.
2 . An electrosurgical instrument according to claim 1 , wherein the housing contains a reservoir of cooling fluid.
3 . An electrosurgical instrument according to claim 2 , wherein the handpiece is such that there are two possible arrangements for the fluid reservoir, a first arrangement in which the reservoir is not connected to the fluid supply lines, and a second arrangement in which the reservoir is connected to the fluid supply lines.
4 . An electrosurgical instrument according to claim 3 , wherein the housing is such that the reservoir is movable between first and second positions, the first position being in which the reservoir is not connected to the fluid supply lines, and the second position being in which the reservoir is connected to the fluid supply lines.
5 . An electrosurgical instrument according to claim 1 , wherein the electrode assembly comprises at least two electrodes separated by an insulating spacer.
6 . An electrosurgical instrument according to claim 5 , wherein the electrode assembly comprises three electrodes provided in a sandwich structure with insulating layers therebetween.
7 . An electrosurgical instrument according to claim 1 , wherein the electrode assembly is in the form of a substantially flat blade.
8 . An electrosurgical instrument according to claim 1 , wherein the pump is driven by an electric motor.
9 . An electrosurgical instrument according to claim 8 , wherein the electric motor is a synchronous motor.
10 . An electrosurgical instrument according to claim 8 , wherein the electric motor constitutes the pump.
11 . An electrosurgical instrument according to claim 10 , wherein the motor includes a spindle on which is provided a paddle, the paddle being rotatable by the motor.
12 . An electrosurgical system comprising an electrode assembly comprising one or more electrodes, a handpiece to which the electrode assembly is secured, an electrosurgical generator for supplying a radio frequency voltage signal to the electrode assembly, and a cooling system for cooling the electrode assembly, the cooling system including fluid supply lines and a pump for driving cooling fluid through the fluid supply lines, the cooling system being wholly contained within the handpiece and the electrode assembly.
13 . An electrosurgical handpiece comprising a housing, first connection means for attaching an electrode assembly to the handpiece, second connection means for connecting the handpiece to an electrosurgical generator, fluid supply lines for directing a cooling fluid to and from the electrode assembly, and a pump for driving cooling fluid through the fluid supply lines, the pump and the fluid supply lines both being wholly contained within the housing of the handpiece.