人工肛门括约肌无线经皮供能系统及实验研究

Wireless transcutaneous power supply system for artificial anal sphincter and its experimental study

设计用于反馈式人工肛门括约肌的无线经皮供能系统,从理论和实验2个方面对基于磁耦合谐振的无线能量传输这一前沿技术进行研究。接发线圈均采用平面螺旋结构沿磁芯表面绕制而成。为了在体外供电时耦合链路能够较好地处于谐振状态,减少由于位置变化或人体组织干扰可能带来的频率分裂现象,系统加入了半自动闭环反馈控制环节,在此基础上进行了大量的离体和活体动物实验。实验主要围绕线圈的选择、传输水平、传输路径、障碍物对传输性能的影响,表明在直径分别为6 cm和3.5 cm的初级和次级平面螺旋线圈作用下,设定固有频率230 kHz,实现了发射功率2 W,最大传输效率达82%,在10～15 mm距离内效率仍有63%～75%的能量传输,满足了该植入式器件的用电需求。

In this paper,a wireless transcutaneous power supply system used for bio-feedback artificial anal sphincter （AASS） is designed. The research focuses on magnetically-coupled resonance wireless power transmission, an ad- vanced technology, and is studied both in theory and experiments. The transmitting and receiving coils both adopt the planar spiral structure and are winded along the magnetic core surface. To ensure that the coupling link works in proper resonance state when the power is provided in vitro, a semi-automatic closed-loop feedback control is added to the system, with this method, the frequency splitting phenomenon possibly caused by position change or human tissue interference can be reduced. Based on the above implementation, plenty of in vitro and in vivo animal experiments were conducted, which are mainly about the coil selection, transmission level, transmission path, the effect of barriers on transmission performance. The experiment results indicate that using the primary and secondary spiral coils with diameters of 6 cm and 3.5 cm,respectively and setting the intrinsic frequency as 230 kHz,the proposed system has achieved a satisfied coupling performance, the emission power is 2 W and the maximum transfer efficiency is 82%. Moreover,the system can still provide a robust transfer efficiency of 63%--75% under a percutaneous distance of 10--15 mm, which meets the power requirement of AASS abundantly.