Gyrus Medical Limited

Andrew John Ford

Michael David Newton

Colin C O Goble

Colin Charles Owen Goble

David Morris

Robert C Humble

Christopher Charles Benn

David W Morris

An electrosurgical instrument is provided for the treatment of tissue, the instrument comprising an instrument shaft () having a longitudinal axis, and an electrode assembly at one end of the shaft. The electrode assembly comprises first and second active electrodes (), () and at least one return electrode (), the electrodes being electrically insulated one from another by means of one or more insulation members (). The first and second active electrodes () each have an exposed surface for treating tissue, the exposed surface () of the first active electrode being such as to treat tissue disposed laterally of the longitudinal axis at a first radial position with respect to the instrument shaft. The exposed surface () of the second active electrode is such as to treat tissue disposed laterally of the longitudinal axis at a second radial position with respect to the instrument shaft. The instrument has a first set of connections by which the first active electrode () can be placed in circuit with the return electrode (), and a second set of connections by which the second active electrode () can be placed in circuit with the return electrode ().

Electrosurgical instrument

In an electrosurgical generator for generating radio frequency power, the generator includes a radio frequency output stage having two or more output connections, and a power supply coupled to the output stage for supplying power to the output stage. A controller is operable to cause the generator to supply a blended output signal alternating constantly between a first output signal across the output connections in which the radio frequency output voltage developed across the output connections is limited to at least a first predetermined threshold value for cutting or vaporisation of tissue, and a second output signal across the output connections in which the radio frequency output voltage developed across the output connections is limited to a second threshold value for coagulation. There is also provided adjustment means, operable by a user of the electrosurgical generator, for changing between various preset settings for the blended signal, the preset settings each having a predetermined duty cycle of the blended signal that is limited to the first threshold value for cutting or vaporisation, and a predetermined duty cycle of the blended signal that is limited to the second threshold value for coagulation.

Electrosurgical generator and system

Growing community of inventors

North Somerset, United Kingdom

Andrew John Ford