Low-frequency induction heating of a ferromagnetic catheter for the varicose veins treatment: a study of feasibility

Low Frequency Induction Heating (LFIH) phenomena take place in a ferromagnetic catheter under the influence of a low frequency magnetic excitation field. This contactless heat source can be used to heal locally and destroy damaged blood vessels. According to medical specialists, thermal ablation of varicose veins requires a temperature of 120°C and time constants lower than a few seconds. First investigation results showed great potential of the LFIH method but further surveys and validation steps are still needed before in vivo testing can commence. In this article, multi-physics simulation results, including ferromagnetic, thermal and fluid mechanic considerations are proposed and compared to experimental data when possible. The most efficient magnetic waveform (frequency) is determined such as its influence on the human tissues. These results constitute a mandatory step toward a first medical test and the overall medical certification of this alternative treatment.