Ideal Carrier Waveform for Functional Electrical Stimulation in Upper Extremity. |
Han, Tai Ryoon , Kim, Jin Ho , Paik, Nam Jong , Lim, Suk Jin , Ko, Kyung Rok , Kim, Hee Chan |
1Department of Rehabilitation Medicine, Seoul National University College of Medicine. 2Department of Biomedical Engineering, Seoul National University College of Medicine. |
상지의 기능적 전기자극에 있어 이상적인 전류파형에 대한 연구 |
한태륜, 김진호, 백남종, 임석진, 고경록, 김희찬 |
서울대학교 의과대학 재활의학교실 의공학교실 |
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Abstract |
Objective This study was purposed to find the ideal carrier waveform in burst wave in Functional Electrical Stimulation (FES) for upper limbs after selection of proper site of electrode. Method The 10 healthy men's non-dominant hands were studied. In 5 muscles (adductor pollicis, flexor digitorum sublimis, flexor pollicis longus, extensor digitorum communis and extensor pollicis brevis), the site where electric stimulus induced the best of purposed response was selected. A burst wave contains three carrier waveforms : sine, triphasic & rectangular. The amount of mean current was measured during key grip and open motion. Discomfort of subject was scored by three degree and compared among three waveforms. Results The amount of mean current in key grip and open motion is lowest at triphasic wave (31.3 mA, 50.5 mA) and highest at rectangular wave (79.4 mA, 82.1 mA). For the discomfort, rectangular waveform provoke the greatest discomfort in key grip and open motion. There is no statistical difference between sine and triphasic waveform. Conclusion In FES of upper limbs, triangular wave can be an useful carrier waveform which require less amount of current for performing the same motion and less discomfort than rectangular or sine waveform. |
Key Words:
Triangular wave, Carrier waveform, Mean current, Functional electrical stimulation (FES) |
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