The Development of a Multi-Channels Functional Electr ical Stimulation System for Rehabilitation (II)

功能性電刺激目前廣泛使用於癱瘓病 人手部或腳部功能的復健上。然而，各種 功能性電刺激的研究所使用刺激參數的要 求與調整波形的方法不盡相同。本計畫研 製完成一套新穎的電刺激器，可廣泛適用 於各方面FES 之應用。 本系統提出以”元素”與”包波”合成刺 激波形的方法，可同時顯現刺激脈波細部 參數的變化，又允許儲存長時間的刺激波 形程序。使用者可於個人電腦上開發的視 窗化界面設計所需的波形，再將之傳送到 電刺激器上輸出。系統採用TMS320C32 數位訊號處理器合成四通道高解析度刺激 波形，並透過自製的輸出級電路產生定電 流隔離刺激。使用者可隨時調整任何的刺 激參數，或由系統擷取回授信號，利用處 理器高速運算能力即時調整最佳刺激波 形。Functional Electrical Stimulation (FES) has been widely applied to restore the function of paralyzed extremities. However, in different FES applications, the stimulation parameter requirement and the ways to adjust stimulation waveforms are quite different. This research developed a novel functional electrical stimulator, which is suitable for various FES applications. We proposed a concept of “element and envelope” to synthesize stimulation waveforms. This method has the benefit that it can store a long stimulation pattern as well as keep good time resolution. A friendly graphic-user-interface is provided for designing the required stimulation patterns. The TMS320C32 Digital Signal Processor (DSP) is selected to generate a 4- channel stimulation based on the designed patterns. An elaborate output stage is designed to convert stimulation waveforms to constantcurrent outputs. All the stimulation parameters can be either adjusted manually, or modulated according to the feedback control algorithms programmed in the DSP