电子镇痛仪电信号传导机制模型建立与分析

Modeling and analysis of electrical signal transduction mechanism of electronic analgesic apparatus

目的:分析电子镇痛仪电流信号在手臂肌肉内的信号传导情况,为电刺激镇痛提供理论依据。方法:结合人体解剖学与组织结构学,在COMSOL Multiphysics 5.5有限元仿真软件中,利用圆台、圆柱、椭球为几何实体,建立电子镇痛仪数值仿真有限元模型。在频域环境下,通过注入载波信号分别为100 kHz、1 MHz、10 MHz,幅度为±20 mA的电流信号,以此分析信号在手臂中的传播机制。结果:随着载波频率的不断增加,集肤效应越来越明显,信号在电极接触处皮肤部分越来越集中,容积导体内部的扩散性也将失去一致性。在100 kHz时,随着离电极中心的通信距离逐渐增加,信号在手臂内部信号扩散变得越来越均匀。结论:在电子镇痛仪实施肌肉酸痛治疗过程中,通信频率越高,信号越难以进入机体内部,信号一致性越差。因此,在实施电流镇痛过程中,信号电极应尽量布置在镇痛靶向区域附近。

Objective To analyze the electrical signal transduction of electronic analgesic apparatus in the arm muscle, thereby providing a theoretical basis for analgesia elicited by electrical stimulation. Methods In combination with the human anatomy and histological structure, the numerical simulation finite element model of electronic analgesic apparatus was established using the circular truncated cone, cylinder and ellipsoid as geometric entities in COMSOL Multiphysics 5.5 finite element simulation software, and the current signals with carrier signals of 100 kHz, 1 MHz and 10 MHz and the amplitude of ±20 mA were injected in the frequency domain environment for analyzing the transduction mechanism of electrical signal in the arm.Results With the continuous increase of carrier frequency, the skin effect became more and more obvious, and the signal was more concentrated at the part where the electrode contacted the skin, and the diffusion inside the volume conductor would lose consistency. At 100 kHz, as the communication distance from the electrode center gradually increased, the signal diffusion in the arm became more and more well-distributed. Conclusion For muscle soreness treatment with the electronic analgesic apparatus, the higher the communication frequency is, the more difficult it is for the signal to enter the body, and the worse the signal consistency is. Therefore, during electronic analgesia, the signal electrode should be arranged near the analgesic target area as much as possible.