Simulation Analysis And Control Circuit Design Of Portable Transcranial Magnetic Stimulation System

Transcranial magnetic stimulation has become a more and more popular neural sc ience tool, because it can change the neural activity of the target area in the brain. But at present, transcranial magnetic stimulation system still faces two problems: on the one hand, focality and depth of stimulatio n still need to be further optimized, and the energy consumption and calorific value is still large; on the other hand, the existing transcranial magnetic stimulation system has complicated control process, high working voltage, bulky and expensive, resulting in a limited application scenarios. In this thesis, we conduct in-depth research on these issues.Firstly, the magnetic field simulation analysis and optimization design of the stimulation coils of transcranial magnetic stimulation system were realized. Electromagnetic field of different stimulation coils was simulated and characteristics of different coils was analyzed. In order to improve the development quality and efficiency of stimulation coils, transcranial magnetic stimulation coil parametric des ign based on mixed programming of VB and Ansoft Maxwell was implemented. At last, coils in focality and depth of stimulation, energy consumption and calorific was optimized.Secondly, the control circuit of portable transcranial magnetic stimulation system was designed and implemented. On the basis of analyzing the basic principle of the co ntrol circuit of the transcranial magnetic stimulation system, the system performance influenced by the parameters of the key elements such as the energy storage capacity and the stimulating coils was analyzed. Control circuit system with dual power supply improved the portable transcranial magnetic stimulation system application scene of flexibility and modular voltage source with slingshot pressure circuit scheme guaranteed the circuit stability. The control of stimulate the pattern, stimulation frequency and stimulation intensity was realized through by cell phone.Finally, a test environment for portable transcranial magnetic stimulation system was designed and built. O utput voltage, magnetic field intensity and the spatial distrib u-tion of electric field intensity, stimulation intensity etc. of the portable transcranial magnetic stimulation system were tested as well as the test results and finite element simulation results were compared and analyzed. And then, a preliminary experiments in the human body was implemented. The experimental results show that the test results are basically consistent with the simulation results. The whole system has achieved the e xpected effect in the laboratory environment.