Finite element analyses of uniform current density electrodes for radio-frequency cardiac ablation
| Autor: | Supan Tungjitkusolmun, Jang-Zern Tsai, V.R. Vorperian, Hong Cao, Eung Je Woo, J.G. Webster |
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| Rok vydání: | 2000 |
| Předmět: |
Hot Temperature
Materials science Radio Waves Surface Properties Physics::Instrumentation and Detectors Biomedical Engineering Edge (geometry) engineering.material Coated Materials Biocompatible Coating Physics::Plasma Physics Electrical resistivity and conductivity Materials Testing Electronic engineering Composite material Electrodes Resistive touchscreen Electric Conductivity Equipment Design Models Theoretical Electrode Catheter Ablation engineering Charring Radio frequency Current density |
| Zdroj: | IEEE Transactions on Biomedical Engineering. 47:32-40 |
| ISSN: | 0018-9294 |
| Popis: | The high current density at the edge of a metal electrode causes hot spots, which can lead to charring or blood coagulation formation during radio-frequency (RF) cardiac ablation. We used finite element analysis to predict the current density distribution created by several electrode designs for RF ablation. The numerical results demonstrated that there were hot spots at the edge of the conventional tip electrode and the insulating catheter. By modifying the shape of the edge of the 5-mm tip electrode, we could significantly reduce the high current density at the electrode-insulator interface. We also studied the current density distribution produced by a cylindrically shaped electrode. We modified the shape of a cylindrical electrode by recessing the edge and filled in a coating material so that the overall structure was still cylindrical. We analyzed the effects of depth of recess and the electrical conductivity of the added material. The results show that more uniform current density can be accomplished by recessing the electrode, adding a curvature to the electrode, and by coating the electrode with a resistive material. |
| Databáze: | OpenAIRE |
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