Abstract

Info

Author(s):: CANG Chen; DING Xiaoyu; ZHENG Zheng; School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

Keywords:: Keywords: electric stimulator nerve stimulation interference current FPGA

Abstract:: Abstract: An interference current stimulator for peripheral nerve electrical stimulation is designed. The stimulator which is a two-way current output can generate 4 kinds of waveforms. The frequency, amplitude and other parameters of each waveform can be set in the upper computer. The frequency resolution, amplitude resolution and time resolution are 0.2 Hz, 0.01 mA and 0.1 μs, respectively. The stimulator is characterized in that the current ratio can be continuously changed under the condition that the stimulation intensity is constant, or that the stimulation intensity can be continuously changed when the current ratio is constant. The upper computer is developed by LabVIEW and the lower computer uses FPGA to control 3 DAC. The waveform signal generated by the DAC is applied to the load after being isolated by the constant current source circuit. After testing, the stimulator can accurately generate 4 kinds of waveforms, with a current deviation within 2.6% and good constant current characteristics. The stimulator which is small in size, simple in operation and stable in waveform generation can be used for the non-destructive electrical stimulation studies.