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Author

Edward J. Gough

Bio: Edward J. Gough is an academic researcher. The author has contributed to research in topics: Periscope antenna & Energy source. The author has an hindex of 14, co-authored 20 publications receiving 2613 citations.

Papers
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Patent
03 Nov 1997
TL;DR: In this paper, a volumetric ablation is achieved without impeding out any of the deployed antennas when 5 to 200 watts of electromagnetic energy is delivered from the electromagnetic energy source to the multiple antenna ablation device.
Abstract: A multiple antenna ablation apparatus includes an electromagnetic energy source, a trocar including a distal end, and a hollow lumen extending along a longitudinal axis of the trocar, and a multiple antenna ablation device with three or more antennas. The antennas are initially positioned in the trocar lumen as the trocar is introduced through tissue. At a selected tissue site the antennas are deployable from the trocar lumen in a lateral direction relative to the longitudinal axis. Each of the deployed antennas has an electromagnetic energy delivery surface of sufficient size to, (i) create a volumetric ablation between the deployed antennas, and (ii) the volumetric ablation is achieved without impeding out any of the deployed antennas when 5 to 200 watts of electromagnetic energy is delivered from the electromagnetic energy source to the multiple antenna ablation device. At least one cable couples the multiple antenna ablation device to the electromagnetic energy source.

750 citations

Patent
14 Mar 1997
TL;DR: In this paper, an ablation apparatus with a handpiece, an electrode, a probe, a thermal sensor, and an energy source is presented, where the probe is at least partially positionable in the electrode lumen and configured to be advanced and retracted.
Abstract: An ablation apparatus includes a handpiece, an electrode extending from a handpiece distal end, a probe, a thermal sensor and an energy source. The electrode includes a distal end and a lumen, a cooling medium inlet conduit and a cooling medium exit conduit. Both conduits extend through the electrode lumen to an electrode distal end. A sidewall port, isolated from a cooling medium flowing in the inlet and outlet conduits, is formed in the electrode. The probe is at least partially positionable in the electrode lumen and configured to be advanced and retracted in and out of the sidewall aperture. The thermal sensor is supported by the probe. The electrode is coupled to an energy source.

405 citations

Patent
03 Sep 1996
TL;DR: In this paper, an ablation apparatus has an introducer including an introduction lumen, a proximal portion and a distal portion, and a handpiece with proximal and distal portions coupled to the introducer proximal part.
Abstract: An ablation apparatus has an introducer including an introducer lumen, a proximal portion and a distal portion. A handpiece with a proximal portion and a distal portion is coupled to the introducer proximal portion. Two or more electrodes are at least partially positioned in the introducer lumen. Each electrode is configured to be advanced from the introducer distal portion in a deployed state into a selected tissue site to define a volumetric ablation volume. A fluid delivery member is positioned on at least a portion of an exterior of one of the electrodes. The fluid delivery member is configured to be coupled to a fluid medium source. A cable is coupled to the electrodes.

234 citations

Patent
15 Aug 1995
TL;DR: In this paper, the adjustable lengths of the primary and secondary antennas permits a desired geometric ablation of a selected tissue mass, and an adjustable insulation sleeve is positioned on an exterior of one of the antennas.
Abstract: An ablation apparatus has a multiple antenna device of adjustable length including an adjustable length primary antenna and an adjustable length secondary antenna. The primary antenna has a longitudinal axis, and the secondary antenna is deployed in a direction lateral to the longitudinal axis. The secondary antenna is constructed to be structurally less rigid than the primary antenna. The adjustable lengths of the primary and secondary antennas permits a desired geometric ablation of a selected tissue mass. An adjustable insulation sleeve is positioned on an exterior of one of the primary or secondary antennas. An energy source is connected to the multiple antenna device. A variety of energy sources can be used including RF, microwave and laser.

219 citations

Patent
15 Aug 1996
TL;DR: In this article, a multiple probe device with at least one lumen, a longitudinal axis and an ablative surface area of length L 1 is described, where L 2 is at least equal to 1/3 L 1.
Abstract: An ablation treatment apparatus has a multiple probe device. The multiple probe device includes a primary electrode/probe/antenna with at least one lumen, a longitudinal axis and an ablative surface area of length L1. The multiple probe device also includes a secondary electrode/probe/antenna that is positioned in a lumen of the primary probe as this last is introduced through tissue. A secondary electrode/probe/antenna distal end is slidingly deployed at a selected tissue site from the primary electrode/probe/antenna lumen in a lateral direction relative to the longitudinal axis. A sensor is at least partially positioned at an exterior of the secondary electrode/probe/antenna distal end at a distance L2 from the primary electrode/probe/antenna along the secondary electrode/probe/antenna distal end. L2 is at least equal to 1/3 L1. An energy source is coupled to the primary electrode/probe/antenna.

218 citations


Cited by
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Patent
19 Jun 1996
TL;DR: In this article, the authors present a controller that can 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 output connections is limited to at least a first predetermined threshold value for cutting or vaporization of tissue, and a second output signal with a power supply coupled to the output stage for supplying power to output stage.
Abstract: 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.

1,486 citations

Patent
11 Oct 1996
TL;DR: In this paper, the authors present methods, devices, and systems for a) revascularization and/or b) performing other medical procedures at vascular or non-vascular intracorporeal locations within a mammalian body.
Abstract: Methods, devices, and systems for a) revascularization and/or b) performing other medical procedures at vascular or non-vascular intracorporeal locations within a mammalian body. The methods generally comprise the formation of at least one extravascular passageway from a blood vessel to a vascular or non-vascular target location. In the revascularization methods the extravascular passageway is utilized for blood flow. In the medical procedure methods the extravascular passageway is utilized as a conduit for accessing or performing procedures at the vascular or non-vascular target location. Also disclosed are catheter devices and systems which are useable to form the extravascular passageways of the invention, as well as apparatus for modifying, maintaining and/or closing such extravascular passageways.

1,310 citations

Patent
10 May 2002
TL;DR: In this paper, a tissue-ablation method and an apparatus are described, which consists of a plurality of RF ablation electrodes, and sensors, each movable from retracted to deployed positions in a tissue to be ablated.
Abstract: A tissue-ablation method and apparatus are disclosed. The apparatus inlcudes a plurality of RF ablation electrodes, and a plurality of sensor elements, each movable from retracted to deployed positions in a tissue to be ablated. A control device in the apparatus is operatively connected to the electrodes for supplying an RF power to the electrodes, to produce tissue ablation that advances from individual-electrode ablation regions to fill a combined-electrode ablation volume. The control device is operatively connected to the sensor elements for determining the extent of ablation in the regions of the sensor elements. The supply of RF power to the electrodes can thus be regulated to control the level and extent of tissue ablation throughout the combined-electrode volume. The electrodes are preferably hollow-needle electrodes through which liquid can be infused into the tissue, also under the control of the control unit, to modulate and optimize tissue ablation.

1,212 citations

Patent
10 Feb 1998
TL;DR: In this article, an electrosurgical generator has an output power control system that causes the impedance of tissue to rise and fall in a cyclic pattern until the tissue is desiccated.
Abstract: An electrosurgical generator has an output power control system that causes the impedance of tissue to rise and fall in a cyclic pattern until the tissue is desiccated. The advantage of the power control system is that thermal spread and charring are reduced. In addition, the power control system offers improved performance for electrosurgical vessel sealing and tissue welding. The output power is applied cyclically by a control system with tissue impedance feedback. The impedance of the tissue follows the cyclic pattern of the output power several times, depending on the state of the tissue, until the tissue becomes fully desiccated. High power is applied to cause the tissue to reach a high impedance, and then the power is reduced to allow the impedance to fall. Thermal energy is allowed to dissipate during the low power cycle. The control system is adaptive to tissue in the sense that output power is modulated in response to the impedance of the tissue.

1,164 citations

Patent
15 May 2003
TL;DR: In this article, the authors describe an exemplary surgical device for treating tissue and methods of treating tissue, which includes a handle, a fluid passage connectable to a fluid source, a tip portion and a distal end.
Abstract: Surgical devices for treating tissue are provided. Also provided are systems for treating tissue and methods of treating tissue. An exemplary surgical device has a handle, a fluid passage connectable to a fluid source, a tip portion and a distal end. The tip portion can simultaneously provide RF power and conductive fluid to tissue. The tip portion includes an electrode having a domed portion having a domed surface and a cylindrical portion having a cylindrical surface. The domed portion is located distal to the cylindrical portion and occupies at least a portion of the distal end of the surgical device. The device includes a fluid outlet opening in fluid communication with the fluid passage, the fluid outlet opening configured to provide the conductive fluid to a surface of the electrode proximal to the distal end surface of the surgical device.

1,150 citations