Research On Interferential Current Therapy Instrument Based On MSP430F149

Because of the accelerated rhythm of life, the incidence of chronic diseases hoists year by year. The development of modern medical technology has brought the rising of medical costs. The aging of the world's population, young people will have to face the reality that they will have to take care of more and more elderly people. Because of the above-mentioned problems, the design of small physiotherapeutic instrument has become the research focus of medical equipment. In this paper, researches based on interferential current therapy instrument, the primary content includes:The theory of Interferential Current Therapy (ICT) is introduced. The principle, physical features, physiological action, and therapeutic methods of ICT are introduced. Interferential Current Therapy provides a medical theory basis for this system.Direct Digital Synthesizer (DDS) technology is introduced. Through the review of the sampling theorem, the analysis of direct digital synthesizer technology is led. The basic principle of DDS is based upon the Nyquist sampling theorem. The basic operational principle and the characteristics of DDS are analyzed. The mathematical model of DDS is given. On this basis, the output spectrum of DDS with ideal parameters and non-ideal parameters are discussed. Analysis focused on background spurious of DDS and their effects on the output spectrum.The project that electric therapy combines with DDS technology and Micro-Controller Unit (MCU) technology is putted forward. Complete design process of this system is discussed. In this paper, the scheme of this system, the programming of the software and the anti-interference measures are designed in detail. The hardware circuit design, DDS circuit simulation, software development, system debugging and the test have been completed. The results introduces that the system meet the need of our demand. Finally, this paper summed up the major work papers and analysis of existing problems, in order to provide a basis and valuable experience for further study.