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Our aim was to compare the different methods of modeling the effect of circulating blood flow on the thermal lesion dimensions created by radio frequency (RF) cardiac ablation and on the maximum blood temperature. Computational models were built to study the temperature distributions and lesion dimensions created by a nonirrigated electrode by two RF energy delivery protocols (constant voltage and...
In recent years, research and development work have been done on surgical robots and navigation systems. Although these systems have potential to realize minimally invasive and precise surgery, it is considerably difficult to control these robots accurately because organ sometimes shows unanticipated behavior during operation. Therefore, the robot control system which can respond to the various change...
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....
Radio frequency ablation is an established minimally-invasive method to treat tumors in organs such as liver and kidney. Several methods for simulation and planning of such a procedure are described in the literature. Since these are usually based on a simplified model of the target structure, their application on more complex structures like the spinal column is not sufficient. In this paper we present...
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...
There has been a growing need to advance the use of thermal ablation therapy as a minimally invasive technique in cancer management. Consequently, this study was undertaken to investigate the use of radiofrequency (RF) energy by developing and testing an economical and effective radiofrequency thermal probe that will effectively destroy volumes of pathological tumours by means of hyperthermia. The...
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