非侵入式盆底电刺激治疗仪的电场分布仿真与实验

Simulation and Experiment of Electric Field Distribution of Non-invasive Pelvic Floor Electric Stimulation Therapeutic Apparatus

该研究主要分析了非侵入式与侵入式盆底电刺激仪的刺激电场分布差异。通过建立人体盆底肌群的电阻网络模型,利用电路回路分析和仿真,得到了刺激电场分布,分析仿真结果表明:侵入式电极由于具有中心对称性,导致盆底肌群有等电位区域,无法形成刺激电流回路,存在电刺激“盲区”,非侵入式电极无此问题;在相同刺激条件下,非侵入式对浅层盆底肌刺激强度最高,中层次之,深层相对较弱;而侵入式电极对浅层和深层盆底肌刺激强度适中,对中层盆底肌有些部位刺激强,有些为刺激“盲区”。此外,动物离体组织实验结果表明组织阻抗很小,脉冲与直流的非侵入电刺激都能很好地传导到组织内部,与分析仿真结果吻合。

This study analyzes the difference between non-invasive and invasive pelvicfloor electric stimulation therapeutic apparatus.Through establishing the resistance network model of human pelvic floor muscle group,using circuit loop analysis and simulation,the current and voltage distribution are obtained,and the conclusions are listed as follows:Since invasive electrode has a central symmetry,pelvic floor muscles have equipotential areas and unable to form the current loop.Non-invasive electrodes don’t have this problem.With the same stimulation conditions,non-invasive stimulation intensity of the superficial pelvic floor muscle is the highest,followed by the middle and the deep layer.While the invasive electrode stimulates the superficial and deep pelvicfloor muscles moderately,the middle pelvicfloor muscles some parts strongly,some parts weakly.The results of in vitro experiments show that the tissue impedance is very small,and the non-invasive electrical stimulation is well conducted into the tissue,which is consistent with the analysis and simulation results.