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

为开发一种新的高频感应消融治疗肾癌的方法，在300kHz高频输出下，研究了钛管内嵌入碳钢棒的加热特性，并制作了消融治疗仪。在这个初步的实验中，倾斜角的磁通量方向的影响显着减少通过选择一个最佳的钛管厚度。基于这些结果，制造了完全覆盖有Ti层的原型消融针用于临床使用。应该强调的是，该原型针具有完全非定向的加热性质的磁通量方向。

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.