Technical characterization of a new bipolar and multipolar radiofrequency device for minimally invasive treatment of renal tumours

BJU International
Axel HäckerMaurice Stephan Michel

Abstract

To investigate the technical characteristics of a newly developed device for bipolar and multipolar radiofrequency ablation (RFA) of kidney tissue with a resistance-controlled power output. The standardized model of the isolated perfused ex vivo porcine kidney was used. Two different applicators (20 and 30 mm active length) were selected for bipolar RFA, and one pair of applicators (2 x 30 mm active length) for multipolar RFA. RF energy was applied at different power levels (20, 30, 60 W) depending on the total active length of the electrodes. Treatment times were 1, 3, 5 and 9 min. The ablation cycles were recorded in continuous digital real-time and displayed on a monitor showing pre-set power, actual applied power, applied energy, tissue resistance, and impedance. Lesion sizes were measured macroscopically. A coagulation coefficient (coagulated tissue volume per applied energy unit) was calculated. There was a dosage-effect relationship between the generator power/treatment time and the sizes of the lesions. With increasing treatment time, less tissue volume was coagulated per unit of applied energy. The actual applied energy was lower than that calculated theoretically. The resistance and impedance values for the 30-W appli...Continue Reading

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Citations

Apr 25, 2012·Nature Reviews. Urology·Michael A Gorin, Mohamad E Allaf
Apr 16, 2010·The Clinical Journal of Pain·Leonardo KapuralKaylea Boutwell
Jan 1, 2011·Case Reports in Anesthesiology·Khalid MalikDavid Walega
Jan 15, 2013·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·Christof M SommerPhilippe L Pereira
Nov 28, 2012·Journal of Vascular and Interventional Radiology : JVIR·Christof Matthias SommerBoris Alexis Radeleff
Dec 7, 2007·Journal of Vascular and Interventional Radiology : JVIR·Jeong Min LeeByung Ihn Choi
Jun 15, 2007·Pain Practice : the Official Journal of World Institute of Pain·Leonardo Kapural, Nagy Mekhail
Mar 8, 2012·BJU International·Zhamshid OkhunovLouis R Kavoussi
Oct 30, 2014·World Journal of Urology·S G C KroezeJ L H R Bosch
Sep 1, 2007·Current Opinion in Urology·H Christoph Klingler
Dec 8, 2010·Veterinary Surgery : VS·Beata DubielEdward G Chekan
Aug 15, 2006·Current Opinion in Urology

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