A new multi-channel electric stimulator based on microcomputers was developed to restore movements of the paralyzed hand in quadriplegics by functional electrical stimulation (FES). Electrical stimulation was applied to the nerves innervating the hand muscles through percutaneously implanted electrodes. There existed non-linear relationships between stimulus amplitude and contractile force which seemed to be disadvantageous for proportional control of the hand movements by patients themselves. Involvement of the inverse function in the stimulation patterns could linearize the muscle responses. Based upon these results, the authors developed algorithms for controlling three kinds of prehension patterns, such as power grasp, key grip and grasp for holding cards in a C6 quadriplegic.
|Number of pages||2|
|Journal||japanese journal of medical electronics and biological engineering|
|Publication status||Published - 1984 Apr|
ASJC Scopus subject areas
- Biomedical Engineering