| With booming development of electrical stimulation technology in the clinical application, researchers pay more and more attentions at magnetic stimulation technology. The magnetic stimulation technology which used in clinical diagnosis and treatment of diseases proofed that it has a high application value and tempting prospects for the development, therefore, it has been hit by a wide attention of scholars. Relative to the electrical stimulation technology, the magnetic stimulation technology have the advantage at painless, easy to repeat operation, no wound, effective and easy to operate.At present, the magnetic stimulation system used in clinically research is basically divided into two classes: high-frequency magnetic field of magnetic stimulation system (such as, transcranial magnetic stimulation, TMS) and extremely low frequency magnetic stimulation system (ELF).The magnetic field strength of high-frequency magnetic field can reach 2.5 tesla's or higher, which generally use the capacitor recharge to produce alternating current, then produce a magnetic field. The magnetic field strength of extremely low frequency magnetic stimulation system is in commonly several millitesla's or even smaller. A type of low frequency magnetic stimulation system based on the AT89S52 SCM is designed in the paper, and I develop the all microcontroller program by assembly language.Different from the existing magnetic stimulation system, the magnetic stimulation system designed in the paper is controlled by SCM, and the SCM sent out the pulse waveform for magnetic stimulation system. This system hardware consists of the AT89S52 SCM, digital pipe display module, D/A conversion module, power amplifier module, button control module, power supply module and electrode coil etc. The treatment time, stimulate strength/frequency and functional status are displayed by Seven digital tube. The frequency and amplitude are adjusted by button control module, and which realized the innovation of the magnetic field frequency stimulation system that can not be adjusted. The system hardware and microcontroller program are simulated by the Proteus single-chip microcomputer simulation software in the design, which reached the design requirements. The three-dimensional electromagnetic field coil model is simulated by ansoft fem simulation software, and the magnetic field strength reach to 20 millitesla's. This article have used Protel 99SE software to map the magnetic stimulation system of the circuit principle diagram, and developed the printing plate circuit, completed the prototype of welding and debugging.In Bethune international peace hospital's sleep disorders research center, we did research to compare the normal adults and sleepiness patients when they underwent stimulation, compare EEG before and after stimulation, and analysis the EEG by power spectrum. Tests show that the magnetic stimulation inhibits certain parts of the brain cortex, and sleepiness patient have stronger effect than normal adult.
|
PDF Full Text Request