植入式生醫裝置在現代醫學中已獲得了廣泛的應用。將微型低功耗的生醫裝置植入人體內，對各種生理資訊進行檢測，或對器官、組織進行控制，更可作為植入式藥物釋放系統。因為裝置不需要通過皮膚或腸胃，各種干擾因素也大大減少，保證了與人體間良好的匹配性，並具有使用方便、舒適，尤其對器官和組織可作即時性的調控，對於恢復身體機能或控制病情有相當大的助益。 近年來，微機電設計和製造技術的進步，促進了植入式生醫裝置的發展，不僅讓生醫元件微型化，也使得無線射頻技術運用在植入式生醫裝置的研發有所突破，控制和回饋的參數、以及用於診斷和治療的資訊也增加很多，這些長足的進展拓寬了植入式生醫裝置應用發展的領域。本研究中主要是探討以無線射頻技術作為植入式生醫元件及裝置所需的能量來源及資料傳輸的方式。藉由分析植入式生醫裝置使用的射頻功率強度、發射頻率、傳輸距離；人體組織的介電係數、導電率；裝置植入部位等因素，研究藉由MRI所建立的醫學掃瞄影像來獲得人體組織分佈，配合不同的人體組織電磁參數，再導入時域有限差分法（FDTD）建立出人體電磁場模型，來模擬植入式生醫裝置傳輸射頻能量時，體內外的SAR值分佈，用於評估植入式生醫裝置在不同設定下的能量傳輸效率。 The implantable bio-medical device has been broadly applied in modern medical science. Implanting the microscopy, low energy consumption devices which can release medicine automatically into human body and get all kinds of physiology information to control organs and tissues. Because this device does not necessary pass through skin and stomach, then several disturbance factors are reduced. Therefore, this device has not only well matching but also a lot of advantages, included convenient usage and comfort, the major function is adjusting quantity of medicine real time to restrain disease and recover faculty of organs. In recent years, the improvements of micro electro mechanical design and manufacturing technology promote development of implanted. These technologies not only microminiaturized the bio-medical element but also made RF technology have great evolution. Control parameters, feedback parameters, diagnosis information and cure information increasing a lot. Remarkable advances have been made in the field of implanted bio-medical device. This paper studies on methods of power supply and data transmission on implantable bio-medical element by RF technology. Analyzing relations between radio power intensity, radio frequency, transmission distance of implantable bio-medical device, permittivity and conductivity of human tissue. This paper utilize human tissue distribution image by MRI related to different dielectric parameter of human beings to establish human electromagnetic field model with FDTD method, which can simulate transmission energy of RF and SAR distribution inward and outward parts of body. Furthermore, this method could estimate energy transmission efficiency in different conditions.
