摘要
目的:人体通信(intra-body communication,IBC)作为一种低功耗的短距离无线通信方式,适合于心内通信场景。本文以人体通信技术基础,利用场路结合的建模方法分析10kHz-10MHz频段内的心内信道特性。方法:在所构建的人体心脏等效模型上加上外部电路,模拟实际的测量过程,并利用电极作为电场与电路的连接点,实现场路结合的心内通信模型。通过离体猪心实验,验证所建模型的准确性,并探究心肌组织的厚度对信号传输的影响。结果:实验表明,外部电路对心内通信的影响不可忽略,应根据实际的测量方案选择合适的输入阻抗;心内信道的仿真结果与测量数据一致性良好,差值小于3dB;在该频段内的心内信道衰减波动很小,衰减几乎与频率无关;心肌层厚度与室间隔厚度的变化对心内信道几乎无影响。结论:该场路结合的建模方法用于心内信道分析研究时具有更高的准确性。
HObjective: As a low-power short-distance wireless communication method, intra-body communication(IBC) is suitable for intracardiac communication. Based on galvanic coupled IBC technology, this paper analyzes the characteristics of intracardiac channel in the frequency band of 10 kHz-10 MHz by using the modeling method of field circuit combination. Methods: The external circuit is added to the equivalent model of human heart to simulate the actual measurement process, and the electrode is used as the connection point between the electric field and the circuit to realize the field circuit combination method. The accuracy of the model was verified by in vitro pig heart experiment, and the effect of myocardial tissue thickness on signal transmission was explored. Results: Experimental results show that the influence of external circuit on intracardiac communication can not be ignored, and the appropriate input impedance should be selected according to the actual measurement scheme. The simulation results of intracardiac channel are in good agreement with the measured data, and the difference is less than 3 dB. In the frequency band of 10 kHz-10 MHz, the attenuation fluctuation of intracardiac channel is very small, and the attenuation is almost independent of frequency. The changes of myocardial thickness and interventricular septum thickness had little effect on the intracardiac channel. Conclusion: The modeling method has higher accuracy when applied to intracardiac channel analysis.
作者
吴嘉辉
刘一鸣
魏紫良
高跃明
杜民
WU Jiahui;LIU Yiming;WEI Ziliang;GAO Yueming;DU Min(College of Physical and Information Engineering,Fuzhou University,Fuzhou 350108,China;Key Lab of Medical Instrumentation&Pharmaceutical Technology of Fujian Province,Fuzhou University,Fuzhou 350108,China)
出处
《生命科学仪器》
2021年第1期42-47,共6页
Life Science Instruments
基金
国家自然科学基金(U1505251)
福建省科技厅项目(2018I0011)。
关键词
人体通信
电流耦合
心内信道
衰减
Intra-Body communication
Galvanic coupled
Intracardiac channel
Attenuation
