| With the rapid development of the economy and people’s awareness of health,more and more implanted electronic devices are appearing in the medical industry,providing convenient services for people.However,percutaneous(implantable)electronic devices are also facing many problems,and how to provide them with efficient and stable power for a long time has been the emphases and hotspot of research.The magnetic coupling resonant wireless power supply technology has the characteristics of suitable transmission distance,good stability,low resonance frequency and no electromagnetic radiation.It is an effective way to solve the problem of energy supply of implantable electronic devices.At the same time,considering the daily life of patients,implantable electronic devices are generally small in size,and the environment in the living body is complex and variable,so it is very important for the miniaturization design of the receiving end in the magnetically coupled resonant wireless power supply system.It is imperative to study its transmission characteristics within biological tissues.This paper is based on the UESTC-SMC international cooperation research topic,in this paper,a miniaturized wireless power receiving antenna is designed.Based on this,the relationship between the transmission performance of the medical wireless power supply system and the implantation position,transmission distance,number of receiving ends and biological characteristics of the biological tissue is studied.The main work of this paper is as follows:(1)Using the coupled mode theory and the mutual inductance circuit theory,the transmission efficiency of the coupled system at different spatial scales and different receiving ends is mainly related to the mutual inductance value and the optimal load between the coils.(2)The simulation model of the miniaturized receiving coil and the large-scale in vitro transmitting coil simulation model were established by using the electromagnetic simulation software HFSS,and the coil parameters were optimized according to actual needs.(3)A three-layered biological tissue simulation model is established to simulate the depth of implantation,the inclination,the position,and the dielectric constant and conductivity of the implanted biological tissue on the implanted energy receiving antenna.The safety assessment of biological tissues and implantable electronic components is performed on electromagnetic radiation generated in magnetically coupled resonant wireless energy transmission.(4)A medical wireless power supply test platform is built to test the transmission system under different influence conditions,and the axial movement,radial movement,rotation angle between the shafts,implantation depth and transmission efficiency of the double receiving end were obtained.The resulting graph and histogram are compared to the results of the simulation.In this paper,the high-frequency electromagnetic simulation software is used to miniaturize the design and parameter optimization of the coil in the magnetic coupling resonant wireless power supply system,and the performance analysis and experimental demonstration of its performance in different positions in biological tissue are carried out.At the same time,a one-to-many transmission characteristic experiment was carried out,which realized the simultaneous power supply to the dual receiving end under a certain transmission distance,which provided a certain theoretical and experimental basis for the application of wireless power supply in medical implantable electronic equipment. |
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