植入式无线能量传输系统

目的提出一种适用于植入式医疗设备的无线供电系统,引入磁谐振耦合供能的方法,并通过建立理论线圈仿真模型计算线圈尺寸与谐振频率,有效解决植入式装置无线供电距离远、尺寸小等难题,使植入式装置可无需更换电池而终生使用。方法首先通过MATLAB仿真耦合谐振线圈模型以及无线能量传输模型,并计算出满足条件的最优线圈设计。然后依据仿真结果制作发射线圈与接收线圈,设计植入式无线供电实际硬件系统,使系统在限定的距离等条件下有最优的传输效率。结果仿真算法能有效描述磁耦合谐振,计算与测量可以得到Q、L的理论与实际的平均相对误差E_Q=5.34%、E_L=4.42%,为实际供电系统的设计提供了参考依据。设计实现了适合于医疗植入的微型供电系统,增加了传输距离。该方案采用线圈大对小设计,植入部分尺寸仅有18 mm,体外线圈直径85mm,实际最高传输效率达到16.20%,80 mm距离可以供能2.642 m W。结论该仿真算法可为耦合谐振设计提供参考,为植入式医疗系统提供一种新的设计方案。

Implanted wireless power transmission system

Objective A wireless power supply system suitable for implantable medical devices is proposed.This paper introduces magnetic resonance coupling energy supply method to implantable power supply system,and calculates coil size and resonance frequency through setting up theoretic coil simulation model in order to solve the problems as long distance and small size of wireless power supply to enable the implantable devices to be used for the whole life without replacing batteries.Methods Coupling resonance coil model and wireless energy transmission model are firstly simulated through MATLAB,and the optimal coil design is calculated.And then,transmitting coil and receiving coil are made according to the simulation results,which make the system with the optimal transmitting efficiency under limited distance.Results The simulation algorithm can effectively describe the magnetic coupling resonance.Average relative errors of Q and L in theory and actuality are calculated and measured,EQ =5.34％ EL =4.42％,providing reference basis for the design of actual power supply system.This design realizes mini power supply system suitable for medical implantable devices with increasing transmission distance.Big-to-small coil design is adopted,and size of the implantable part is only 18 mm with external coil diameter of 85 mm.The transmission efficiency of this design actually reaches 16.20％ to the highest,and 2.642 mW can be supplied at a distance of 88 mm.Conclusions The simulation method provides a reference for the coupling resonance design and is a new design for implantable medical systems.