Closed-loop control using a stretch sensor for restoration of standing with functional electrical stimulation in complete paraplegia

Citation
Y. Shimada et al., Closed-loop control using a stretch sensor for restoration of standing with functional electrical stimulation in complete paraplegia, TOH J EX ME, 193(3), 2001, pp. 221-227
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Medical Research General Topics
Journal title
TOHOKU JOURNAL OF EXPERIMENTAL MEDICINE
ISSN journal
0040-8727 → ACNP
Volume
193
Issue
3
Year of publication
2001
Pages
221 - 227
Database
ISI
SICI code
0040-8727(200103)193:3<221:CCUASS>2.0.ZU;2-Q
Abstract
A closed-loop control system for standing with functional electrical stimul ation (FES) using percutaneous intramuscular electrodes in complete paraple gia is described. The system consisted of ultrafine percutaneous intramuscu lar electrodes, a 32-channel stimulator and a stretch sensor with active cu rrent control. to detect knee buckling. The closed-loop control system was applied in a T8 completely paraplegic patient. Compared to the stretch sens or with a wide use flexible goniometer for direct current control during st anding, the stretch sensor was superior to the flexible goniometer in both ease of use and response. The average time delay from the start of knee buc kling until the sensor turned on was 0.56 +/-0.19 seconds (Mean +/-S.D.) in the goniometer and 0.21 +/-0.06 seconds in the stretch sensor. The average time delay from the start of knee buckling until the recovery from knee bu ckling was 1.01 +/-0.05 seconds in the goniometer and 0.78 +/-0.06 seconds in the stretch sensor. The continuous standing ability of the patient incre ased from 12 minutes with open-loop stimulation to 30 minutes with the clos ed-loop control. No complications such as falling occurred during clinical use. This system prevented falling due to knee buckling during standing and prolonged upright; activities in complete paraplegics.