Objective In this paper, an implantable electromyogram ( EMG ) electrical stimulation system based on wireless communication is designed to research the effects of electrical nerve stimulation on the biosome and the clinical treatments. Methods The implantable module, with the core of MSP430 microchip, acquires and wirelessly transmits the EMG signal to the external controller and generates the stimulation current under the commands from the external controller. Then, the controller adjusts the command parameters of the stimulator according to the feedback EMG signal to achieve better stimulation effect. In tests, the stimulation current waves output from the implantable module are observed on the oscillograph and the ideal EMG signal generated by the function generator is wirelessly transmitted to the external controller after A/D converting. Results The implantable system receives the commands from the external controller by wireless communication and generates the bidirectional stimulating pulses with the preset parameters. Under commands of the controller, the system acquires and wirelessly transmits the eye EMG signals to the controller for further analysis. Conclusions Compared with the transcutaneous electrical nerve stimulation, the advantages of the implantable stimulation are exact locating,small stimulating current and little pain. This system can adjust stimulating parameters with the feedback acquisition of EMG signals and be widely used because of the small size and better stimulating effects.%目的 设计了一种基于无线通信的植入式肌电刺激系统,为研究神经电刺激对生物体的影响及用于临床治疗奠定基础.方法 根据植入式系统的技术要求和特点,将系统分为体内植入部分和体外控制部分,采用无线方式实现体内外的通信.体内子系统以MSP430单片机为核心,根据体外控制器无线发送的命令参数产生刺激电流,并采集刺激作用下的肌电信号反馈传送到体外.体外控制器根据此反馈的肌电信号来调节刺激器的参数值,以达到更好的刺激效果.实验时,可在示波器上查看体内模块输出的刺激电流波形,另一方面,借助函数发生器产生理想肌电信号,经A/D转换后,在体内单片机控制下无线传输到体外模块.结果 经反复实验测试,该植入系统能无线接收体外控制器的命令,产生所要求的双向刺激脉冲,并能根据体外控制器要求,实时采集刺激作用下的动物眼肌电信号,反馈传送到体外,供研究人员分析、应用.结论 与经皮电刺激相比,植入电刺激定位准确,刺激电流小,疼痛感轻.本文设计的基于无线通信的植入式肌电刺激系统,能根据采集的肌电信号实时调节刺激器参数,体积小巧,刺激效果好,实用性强,应用潜力大.
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