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本文介绍了一种由肌肉电控制的前臂假肢。该假肢是利用前臂截肢者残端上检测到的肌电信号来控制的,可以实现指伸屈和旋腕两种动作。介绍了获取和处理肌电信号的模拟电路,全部电路置于带有镀金电极的小型绝缘塑料盒内,使镀金电极与残端肌肉直接接触以提取肌肉电信号。对假手的机械结构和握力进行了分析,讨论了减轻假手重量和降低机械噪声的方法。能自动换速增力的机构,使假手获得了传动效率高、噪声低和握力大的效果。两年多的临床应用结果表明,假手的设计是成功的,患者反应良好。
This article describes a muscle-controlled forearm prosthesis. The prosthesis is controlled by the EMG signals detected on the stump of the forearm amputees, which can be used to refer to both flexion and extension and wrist rotation. An analog circuit to acquire and process myoelectric signals is introduced. All circuits are placed in small, insulated plastic boxes with gold-plated electrodes that allow direct contact between the gold-plated electrodes and the stump muscles to extract the electrical signals of the muscles. The mechanical structure and gripping force of the artificial hand are analyzed, and the methods of reducing the weight of the artificial hand and reducing the mechanical noise are discussed. The mechanism that can change speed automatically increases the effect of high efficiency, low noise and large grip force. More than two years of clinical application results show that the design of a prosthetic hand is successful and the patient responds well.