肌肉电导率对人体通信信号传输的影响

Effects of muscle conductivity on signal transmission of intra-body communications

肌肉组织具有良好的电导率且占据人体较大体积,研究肌肉电导率在人体通信中的作用,有助于掌握电流耦合信号传输特性,提高人体建模的准确性。采用有限元法建立电流耦合信号在肢体传输的准静态场模型,研究不同频率下肌肉电导率的变化引起各组织层总电流密度分布的变化,重点分析肌肉各向异性电导率对耦合电流信号传输的影响,最后通过实验测量验证有限元模型。结果表明,超过64%的电流信号流经肌肉层,并且肌肉电导率越大流经肌肉层的电流越多;在1 kHz^1 MHz范围内,肌肉各向异性电导率对人体信号传输有较大影响;考虑肌肉电导率各向异性的模型更接近人体实验结果。

The muscle occupies the large volume of the human body and has good electrical conductivity. The research on effect of muscle conductivity in intra-body communication can help for analyzing the transmission characteristics of cur- rent coupling signal, as well as improving the accuracy of model. The quasi-static model based on the finite element method （FEM） was established and analyzed, for current coupling signal transmission through the limb. The variation of total current density distribution resulted from the muscle conductivity at different frequency was studied. Then the effects of muscle anisotropic conductivity were emphatically analyzed. Finally, the FEM model was verified by experimental measurements. The results showed that more than 64% of the current signal transmitted through the muscle layer. And the larger muscle conductivity, the more current propagates through the muscle. In 1 kHz -1 MHz, the anisotropic conductiv- ity of muscle has a great effect on signal transmission of intra-body communications. What＇s more, the model with mus- cle anisotropic conductivity closer to real human body.