http://myexs.ru/wp-content/themes/multiflex-4-10/img/header.gif
http://myexs.ru/wp-content/themes/multiflex-4-10/img/bg30.jpg

A pneumatically powered knee-ankle-foot orthosis (KAFO) with myoelectric activation and inhibition

Дата: Июнь 23rd, 2009 Автор:
+ Показать свойства документа
  • Тип контента: Научная статья
  • Номер документа: 6344
  • Название документа: A pneumatically powered knee-ankle-foot orthosis (KAFO) with myoelectric activation and inhibition
  • Номер (DOI, IBSN, Патент): 10.1186/1743-0003-6-23
  • Изобретатель/автор: Gregory S Sawicki, Daniel P Ferris
  • Правопреемник/учебное заведение: University of Michigan
  • Дата публикации документа: 2009-06-23
  • Страна опубликовавшая документ: США
  • Язык документа: Английский
  • Наименование изделия: Не заполнено
  • Источник: Journal of NeuroEngineering and Rehabilitation
  • Вложения: Да
  • Аналитик: Глаголева Елена

Background: The goal of this study was to test the mechanical performance of a prototype kneeankle-foot orthosis (KAFO) powered by artificial pneumatic muscles during human walking. We had previously built a powered ankle-foot orthosis (AFO) and used it ef-fectively in studies on human motor adaptation, locomotion energetics, and gait rehabilitation. Extending the previous AFO to a KAFO presented additional challenges related to the force-length properties of the artificial pneumatic muscles and the presence of multiple antagonistic artificial pneumatic muscle pairs. Methods: Three healthy males were fitted with custom KAFOs equipped with artificial pneumatic muscles to power ankle plantar flexion/dorsiflexion and knee extension/flexion. Subjects walked over ground at 1.25 m/s under four conditions without extensive practice: 1) without wearing the orthosis, 2) wearing the orthosis with artificial muscles turned off, 3) wearing the orthosis activated under direct proportional myoelectric control, and 4) wearing the orthosis ac-tivated under proportional myoelectric control with flexor inhibition produced by leg extensor muscle activation. We collected joint kinematics, ground reaction forces, electromyography, and orthosis kinetics. Results: The KAFO produced ~22%–33% of the peak knee flexor moment, ~15%–33% of the peak extensor moment, ~42%–46% of the peak plantar flexor moment, and ~83%–129% of the peak dorsiflexor moment during normal walking. With flexor inhibition produced by leg extensor muscle activation, ankle (Pearson r-value = 0.74 ± 0.04) and knee ( r = 0.95 ± 0.04) joint kinematic profiles were more similar to the without orthosis condition compared to when there was no flexor inhibition (r = 0.49 ± 0.13 for ankle, p = 0.05, and r = 0.90 ± 0.03 for knee, p = 0.17). Conclusion: The proportional myoelectric control with flexor inhibition allowed for a more normal gait than direct proportional myoelectric con-trol. The current orthosis design provided knee torques smaller than the ankle torques due to the trade-off in torque and range of motion that occurs with artificial pneumatic muscles. Future KAFO designs could incorporate cams, gears, or different actuators to transmit greater torque to the knee.

Категория: Научные статьи | Нет комментариев »

Комментарии

Добавить комментарий

Ваш e-mail не будет опубликован. Обязательные поля помечены *


Статистика

Категорий: 179
Статей всего: 2,003
По типу:
 Видео: 36
 Выдержка с форума: 1
 Контактные данные: 12
 Научная статья: 1388
 Не заполнено: 5
 Новостная статья: 317
 Обзор технологии: 42
 Патент: 219
 Тех.подробности: 34
 Тип: 1
Комментариев: 6,633
Изображений: 3,005
Подробней...

ТОР 10 аналитиков

    Глаголева Елена - 591
    Дмитрий Соловьев - 459
    Helix - 218
    Ридна Украина))) - 85
    Наталья Черкасова - 81
    max-orduan - 29
    Елена Токай - 15
    Роман Михайлов - 9
    Мансур Жигануров - 4
    Дуванова Татьяна - 3

Календарь

  • Июнь 2009
    Пн Вт Ср Чт Пт Сб Вс
    « Май   Июл »
    1234567
    891011121314
    15161718192021
    22232425262728
    2930  
  • Авторизация

    Ошибка в тексте?

    Выдели её мышкой!

    И нажми Ctrl+Enter