Research And Design Of Wireless Power Supply And Wireless Communication System For Implantable Neurostimulator

In recent years,Implantable Medical Devices(IMDs)have become a hot research topic in many scientific research institutions and universities due to their good adjuvant treatment effect on human organ and neurological diseases.Among them,the implantable brain nerve stimulator,as one of the more complicated ones,has made great progress in the research of its own technology,but has encountered some "bottlenecks" in the process of clinical application,and the biggest problem is the energy supply.We all know that no electronic device can work without a power source,especially the implantable brain stimulator Although the use of traditional implantable batteries can solve the problem of power supply,it is limited by the capacity and service life of the battery,requiring regular surgery to replace the battery,which will bring great pain to patients.Therefore,new energy supply methods are needed to meet the demand of steady and uninterrupted power supply for implantable neural stimulators.In addition,similar to drug therapy,implantable neural stimulators need to be artificially controlled according to the patient's condition.In this paper,the effects of implantable neural stimulator and related wireless power supply and wireless communication technology are fully investigated,the wearable four-coil wireless power supply and wireless communication system is proposed based on the traditional Magnetic Coupled Resonator Wireless Power Transfer(MCR-WPT)system.By adding graphical user interface(GUI),power regulation circuit and wireless communication equipment and other modules,the constant-voltage and high-efficiency wireless power supply to the implantable brain nerve stimulator and real-time adjustment of working parameters of implantable brain nerve stimulator are realized.When the coupling degree between the transmission coils changes and causes the power change at the receiving end,the system stabilizes the receiving power by adjusting the transmitting power in a closed loop,so as to achieve a constant voltage at the receiving end.In addition,the user can monitor the power supply status and adjust the working parameters of the stimulator at the PC end.This article has carried on the optimized design of synchronous rectifier circuit at the receiving end,puts forward a new synchronous rectifier control circuit,by adding hysteresis comparator,eliminates the AC signal jitter caused by synchronizing signal logic errors,and for the rectification of PMOS tube driven by capacitance way off ahead of schedule,eliminates the shut offtime delay caused by the phase error.The experimental results show that the synchronous rectifier with optimized design is more than 10% more efficient than the traditional diode rectifier.Under the condition of open loop and small size receiving coil,the Power Transfer Efficiency(PTE)of the four-coil system can reach 8.1% at 8cm.Under the condition of closed loop operation,the system can maintain a constant receiving voltage and complete the real-time transmission of working parameter adjustment data.The system has good working stability.