視覺假體電刺激波形的改進研究
[Abstract]:Purpose of the study The visual prosthesis is an implantable medical electronic device for applying artificial electrical stimulation to a nerve tissue structure on the visual path of the blind, The purpose of the visual prosthesis is to make visual perception of those who are blind due to disease or trauma, and to assist them in completing some of the activities, such as reading text, identifying objects, or dealing with unfamiliar environments and the like. One of the main contents of the visual prosthesis study is to increase the nerve stimulation. Effectiveness. The shape of the electrical stimulation pulse waveform (including amplitude, frequency, pulse width, etc.) and the electrode geometry are the weight that affects the effective nerve stimulation. the shape of the pulse waveform directly influences the tissue damage, the electrode corrosion and the charge loss when the electrical stimulation is applied, so that the appropriate pulse waveform is selected to effectively reduce the negative effect caused when the electric stimulation is effectively reduced, It is important to use a relatively mature rectangular two-phase waveform for optimal design in view of the fact that the rectangular two-phase pulse waveform is more common than other pulse waveforms (linear wave, sine wave, exponential wave, etc.) compared with other pulse waveforms (linear wave, sine wave, exponential wave, etc.). shock effect. Study content 1 Visual Prosthesis Electrical stimulation simulation. The process of stimulating the physiological tissue by using the Simulink simulation electrode under the MATLAB platform, the electrode _ tissue interface uses the Randles electrode _ electrolyte interface equivalent circuit model, the input waveform uses the optimized rectangular wave, and the peak voltage, the power and the power are observed. result of energy, etc. 2 rectangular double The optimal design of phase wave. With the characteristic of the zero-order holder in the theory of the control system, a zero-order holder is added to the waveform input device, so that the constant-current stimulation phase is replaced by a regular-sampled stepped wave, changing the parameters of the zero-order holder may cause the amplitude and time of the optimized waveform to change, making it a second order, third-order stepped-wave. 3-visual prosthetic electrical stimulation optimization The stimulation effect of the current waveform is that the input current pulse waveform of the electrode _ electrolyte interface equivalent circuit is the optimized stepped wave, and the peak voltage, the power and the energy after the equivalent circuit of the optimized current waveform are input; and the original rectangular wave and compared with the stimulation effect, the comparative optimization waveform is analyzed and compared with each other, traditional moment Characteristics of the shape wave. The results of the study are 1. The electrical stimulation of the visual prosthesis is rectangular. the wave is optimized to form a stepped wave, and the change parameter can make the optimized wave form a two-step wave. In order to optimize the second-order step-wave input, the peak value of the output voltage is reduced by 11. 05%, and the peak voltage at the time of the step-step wave of the fifth order the drop has reached 11.89%. At the same time the peak voltage is reduced, the average value of the equivalent circuit model the power and the instantaneous power also change. the average power of the fifth-order stepped wave and the maximum instantaneous power of the five-order stepped wave is increased by only 7.75%, Compared with other stepped waves, the energy consumption of the system decreases with the reduction of the peak voltage of the electrode, and the higher the order number of the stepped wave, the higher the energy consumption, the energy consumption is reduced by 11. 79% when the order number approaches infinity, and the five-step ladder energy of a wave The consumption is reduced by 5.96%. The results of the study: 1 rectangular wave is optimized to be stepped After the wave, it has the obvious effect of reducing the peak voltage.. The step-step wave of the fifth order reduces the peak voltage to the maximum. the purpose of reducing the circuit voltage to reduce tissue damage is reached. The power and circuit energy consumption are the measure of the optimization of the waveform. The instantaneous power of the step-step wave of the fifth order The power increase rate of the system is the minimum, and the reduction rate of the average power is the maximum. The energy consumption of the system increases with the order number. and the peak voltage is reduced to the maximum, the average power is reduced to the maximum, and the instantaneous power is increased to a minimum,
【學(xué)位授予單位】:天津醫(yī)科大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:R318.18
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