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RF ablation uses RF current to heat and kill cancer applied via an electrode inserted under image guidance. Tumor has about half the electrical resistivity of normal tissue below 20 kHz, but similar resistivity above 500 kHz. We placed normal porcine liver tissue in contact with agar gel having similar resistivity as tumor within 20-450 kHz. A needle electrode was placed with half of the electrically...
In the last decade, the study of methodologies for heating biological tissue has been an area of most interest in biology and medicine. As a result, the number of electrode solutions has grown in the past years. In this work, we study the capability of using a tubular electrode for heating biological tissue. To test this possibility, liver samples ex-vivo were used and numerical simulations were made...
Tubular electrodes provide a practicable way for heating biological tissues, suitable for medical and biological applications. This kind electrode is made from interlaced nitinol wires, forming a flexible tube that can be easily folded. This paper presents a study concerning the impact of the mesh density on tissue heating.
Radiofrequency ablation has been used to treat some types of cardiac arrhythmias. We have previously proposed an ARMAX model (non structural) to estimate the temperature in the tissue during ablation. Computer modeling has allowed us to study the temperature distribution by means of solving numerically theoretical models based on partial differential equations, which represent physical phenomena....
We developed a novel radio-frequency (RF) stimulator to mimic heat effects similar to the temperature distributions created by moxibustion in porcine tissue. Moxibustion is a traditional Oriental medicine technique using moxa, which is utilized not only to cure disease, but also to increase immunity. However, it may lead to undesired effects including severe pains, blisters, and burns because of the...
A bench liver model is presented that separates the thermal and electrical effects of large blood vessels within radio and microwave frequency ablation boundaries. The model includes a cylindrical tissue environment with a 5 mm vessel placed parallel to and 15 mm way from either a Covidien Energy-based Devices Evidenttrade MW Ablation Percutaneous Antenna or a CoolTipTM RF Ablation Single Electrode...
Image-guided tumor ablation has become increasingly popular in recent years. While various percutaneous ablative techniques currently exist for the treatment but radiofrequency ablation (RFA) is currently the most widely used technique. To perform RFA needle electrode is inserted into tumor and emitted current producing local heat cells of a tumor at temperature above 50-60degC when cells die from...
Rapid localised heating (<100 ms) was achieved in rat hippocampal brain slices by millisecond exposures to radiofrequency (RF) fields, using a metal stimulating electrode to focus the energy into the tissue. This produced very high specific absorption rates (>5 MWmiddotkg-1) in the tissue near the tip of the electrode. Electrophysiological recordings of evoked responses were made to characterise...
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