RECRUITMENT PROPERTIES OF MONOPOLAR AND BIPOLAR EPIMYSIAL ELECTRODES
RECRUITMENT PROPERTIES OF MONOPOLAR AND BIPOLAR EPIMYSIAL ELECTRODES
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DOI：
10.1007/bf02364648
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发表时间：
1986-01-01
影响因子：
3.8
通讯作者：
MORTIMER, JT
中科院分区：
文献类型：
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作者：
GRANDJEAN, PA;MORTIMER, JT
肌肉力被研究为刺激参数的函数、膜上电极相对于神经供应的位置和肌肉长度，以提供对使用膜上电极的运动假体特性的深入了解。急性实验结果表明，对于靠近神经入口或靠近运动点5mm的单极电极，肌肉长度对招募（力与刺激幅度）的依赖性最小。当电极靠近神经入口时，选择性刺激（对邻近肌肉的激活最小）效果最好，恢复率最高。在神经入口对面的肌肉表面放置一对双极电极，在招募范围的低端比单极电极具有更好的选择性，而在高端选择性较差。这种电极结构需要更大的刺激电流，并表现出比单极电极在相同位置获得的更低的招募增益。植入30天后对电极周围组织的检查显示，包裹电极的纤维组织已融入筋膜层。与急性实验相比，包封后对肌肉长度的依赖性略大，刺激的选择性略低。
Muscle force was studied as a function of stimulus parameters, epimysial electrode position relative to nerve supply, and muscle length to provide insight into the properties of motor prostheses that employ epimysial electrodes. The results of the acute experiments indicated that the dependence of recruitment (force versus stimulus amplitude) on muscle length was minimal for a monopolar electrode positioned close to nerve entrance or 5 mm proximal to the motor point. The selectively of stimulation (minimal activation of adjacent muscles) was best, and the recruitment rate the highest, for an electrode placed close to the nerve entrance. A bipolar pair of electrodes placed on the superficial surface of the muscle opposite to the nerve entrance gave better selectivity than the monopolar electrode at the low end of the recruitment range, and poorer selectivity at the high end. This electrode configuration required greater stimulus currents and exhibited a lower recruitment gain than was obtained for a monopolar electrode in the same position. Examination of tissue surrounding the electrode 30 days after implantation showed that the fibrous tissue encapsulating the electrode had been incorporated into the fascial layer. Slightly larger dependence on muscle length and lower selectivity of stimulation were measured after encapsulation than were measured in the acute experiments.