中国医疗器械杂志
中國醫療器械雜誌
중국의료기계잡지
CHINESE JOURNAL OF MEDICAL INSTRUMENTATION
2013年
1期
6-9
,共4页
王昱%隋晓红%冯刚%李刚%柴新禹
王昱%隋曉紅%馮剛%李剛%柴新禹
왕욱%수효홍%풍강%리강%시신우
植入式MEMS微电极%视觉假体%电化学阻抗%pH值%温度特性
植入式MEMS微電極%視覺假體%電化學阻抗%pH值%溫度特性
식입식MEMS미전겁%시각가체%전화학조항%pH치%온도특성
flexible MEMS microelectrode%visual prosthesis%electrochemical impedance%pH%temperature characteristic
Three-electrode testing method was used to investigate the effect of temperature on electrode impedance, and the pH shifts in saline solution resulting from the electrical stimulation were also determined. Experiments in PBS (phosphate buffered solution) solution showed that the electrode impedance was almost invariable at the human body temperature range (35oC~40oC). And the experiments in unbuffered saline solution showed that pH shifts decreased from 0.03 to 0.005 when the frequency of biphasic charged-balanced pulses increased from 1 Hz to 100 Hz. Even stimulated by monophasic pulses (frequency is 15 Hz, amplitude is 50μA), the stimulus-induced pH shift of electrode only varies 0.15 (anodic pulse current increased 0.15 and cathodic pulse current decreased 0.15).
