Riedy L W, Walter J S
Rehabilitation Research and Development Center, Hines VA Hospital, IL.
Ann Biomed Eng. 1994 Mar-Apr;22(2):202-11. doi: 10.1007/BF02390378.
Functional neuromuscular stimulation (FNS) is often limited by electrode malfunctions such as corrosion and breakage, particularly for intramuscular and epimysial type electrodes. As a result, the electrochemical charge injection characteristics and corrosion responses of single strand 316LVM stainless steel and MP35N nickel-cobalt alloy electrodes were evaluated in vitro. For charge balance, capacitor coupled monophasic protocols with varying charge injections were employed. Electrodes were evaluated with either positive-first or negative-first pulses, 60 Hz, 100 microsec pulse duration, and stimulation periods from 100 to 240 hours. Charge injection densities ranged from 20 to 80 microC/cm2. For both anodic-first and cathodic-first pulsing, the potential transients for the MP35N electrodes were more extreme than for the 316LVM electrodes over the test period, and increased corrosion was apparent on the MP35N electrodes from both optical and scanning electron microscopy. Therefore, 316LVM, but not MP35N, may be suitable for FNS applications with charge injection densities less than 40 microC/cm2.
功能性神经肌肉电刺激（FNS）常常受到诸如腐蚀和断裂等电极故障的限制，特别是对于肌内型和肌外膜型电极而言。因此，对单股316LVM不锈钢电极和MP35N镍钴合金电极的电化学电荷注入特性及腐蚀反应进行了体外评估。为实现电荷平衡，采用了具有不同电荷注入量的电容耦合单相方案。使用正脉冲优先或负脉冲优先、60赫兹、100微秒脉冲持续时间以及100至240小时的刺激周期对电极进行评估。电荷注入密度范围为20至80微库仑/平方厘米。在整个测试期间，对于阳极优先和阴极优先脉冲，MP35N电极的电位瞬变比316LVM电极更为剧烈，并且从光学显微镜和扫描电子显微镜观察到MP35N电极上的腐蚀明显增加。因此，对于电荷注入密度小于40微库仑/平方厘米的FNS应用，316LVM可能是合适的，而MP35N则不然。
