透過結合產生時變交替磁場之技術與奈米科技，使用奈米磁性粒子之癌症熱治療醫療器材（醫材）目前已成功開發並於歐洲合法上市。該醫材於理論上得達成無創治療癌症之理想。本文介紹此類醫材之主要組成、利用磁場激發注入患者體內之奈米磁性粒子發熱之原理、以及奈米磁性粒子選擇性標定癌病灶之原理等，並介紹與評析此類醫材可能為患者與操作者帶來之風險。

By combining the technique of generating time-varying and alternating-directional magnetic field with the nanotechnology, a medical device (MD) for thermotherapy of cancer by using magnetic particles in nanometer scales was developed and legally marketed in Europe. In principle, MD of this kind could accomplish the ideal of noninvasive cancer therapy. The article introduced the major components of this kind of MD, the principles of exciting the magnetic particles in nanometer scales (MPNS) to generate heat, and the principles for the MPNS to selectively target the desired cancerous site, etc. The article also introduced and reviewed the risks this kind of MD would bring to the patients and to the operators.