System development of minimally invasive ablation therapy of renal cancer using high-frequency induction technique

为了开发一种利用高频感应技术进行肾癌消融治疗的新方法，研究了300 kHz高频输出下埋入钛管的碳钢棒的加热特性以及消融治疗仪的制作。在初步实验中，通过选择最佳的钛管厚度，显著减小了倾角对磁通方向的影响。在此基础上，研制了一种用于临床的全覆盖钛层的消融针样机。需要强调的是，该样针对磁通方向具有完全的无取向加热特性。

To develop a novel ablation therapy of renal cancer utilizing a high-frequency induction technique, the heating property of the carbon steel rod embedded into the Ti-tube was investigated in a high-frequency output at 300kHz as well as the fabrication of ablation therapy apparatus. In this preliminary experiment, the effect of the inclination angle to the magnetic flux direction was significantly reduced by choosing an optimum Ti-tube thickness. Based on such results, a prototype ablation needle, which is wholly covered with a Ti layer was fabricated for the clinical use. It should be emphasized that this prototype needle possesses a complete non-oriented heating property to the magnetic flux direction.