Design of a hydraulic ankle-foot orthosis

Gmerek, Artur; Meskin, Nader; Tehrani, Ehsan Sobhani; Kearney, Robert E.

doi:10.1109/biorob.2016.7523768

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…A lot of existing devices are characterized by a complicated design using many sensors, which requires complex control algorithms [30]. Different control strategies can be found in the literature, such as fuzzy logic control [31], PID (position) control [32], adaptive control [33] and inverse dynamics control [34]. Unfortunately, an increase in complexity of control systems through multiple sensors and impedances does not ensure the best solution for orthotic devices, because they are becoming cost-intensive and not suitable for daily use [35].…”

Section: Introductionmentioning

confidence: 99%

Development and Preliminary Evaluation of a Lower Body Exosuit to Support Ankle Dorsiflexion

2021

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For patients suffering from drop foot due to weakness of ankle dorsiflexion muscles, an ankle foot orthosis provides increased foot clearance during the swing phase of gait, but often restricts other gait functions, such as plantarflexion. Due to steady progress in the development of lighter and smaller actuator technologies, active wearable devices such as exosuits become relevant for rehabilitation, since they can offer an extended functionality including a more comfortable wear than passive plastic orthosis. The aim of the paper is to present a lightweight exosuit supporting dorsiflexion during gait with autonomous recognition of gait phases and conditions. One main requirement during the iterative development of the exosuit is a non-restrictive function, thus no differences between the assisted and non-assisted gait of a healthy subject should occur. We therefore conducted a pilot biomechanics study using statistical parametric mapping to analyze kinematics of the ankle joint and muscle activity of m. tibialis anterior of nine subjects without any gait anomalies walking with and without the exosuit. The results show no significant difference between with and without support. In contrast to passive orthosis, the developed system could be an enhanced solution to assist patients suffering from drop foot, which should be analyzed in the next step for evaluating the development.

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Section: Introductionmentioning

confidence: 99%

Development and Preliminary Evaluation of a Lower Body Exosuit to Support Ankle Dorsiflexion

2021

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“…Contrary to passive devices, powered devices have onboard power sources and actuators that can provide positive and negative work to assist the users in the stance phase. They are usually actuated by electric motors [ 8 – 10 ], artificial pneumatic muscles [ 11 , 12 ], linear or rotary pneumatic actuators [ 13 – 15 ], and hydraulic cylinders [ 16 ]. In these two categories of ankle-foot orthoses and prostheses, passive devices are relatively more popular in daily use due to their simplicity, compactness, durability, and comfort but have not been shown to sufficiently improve patients' biomechanics and energetic cost [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Design and Evaluation of a Wearable Powered Foot Orthosis with Metatarsophalangeal Joint

Liu

Zang

Zhang

et al. 2018

Applied Bionics and Biomechanics

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The metatarsophalangeal (MTP) joints play critical roles in human locomotion. Functional restriction or loss of MTP joints will lead to lower walking speed, poorer walking balance, and more consumed metabolic energy cost compared with normal walking. However, existing foot orthoses are focused on maintaining the movement of the ankle joint, without assisting the MTP joints. In this paper, in order to improve the walking performance of people with lower limb impairments, a wearable powered foot orthosis (WPFO) which has actuated MTP joint is designed and constructed. Preliminary experiments on three nondisabled subjects demonstrated functionality and capabilities of the WPFO to provide correctly timed dorsiflexion and plantar flexion assistance at the MTP joint during walking. These results also suggest that the WPFO could offer promise in certain rehabilitation applications and clinical treatment.

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Development and Testing of a User-adaptive Ankle Foot Orthosis

Zhou

Liu

2020

2020 5th International Conference on Advanced Robotics and Mechatronics (ICARM)

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Design of a hydraulic ankle-foot orthosis

Cited by 3 publications

References 15 publications

Development and Preliminary Evaluation of a Lower Body Exosuit to Support Ankle Dorsiflexion

Development and Preliminary Evaluation of a Lower Body Exosuit to Support Ankle Dorsiflexion

Design and Evaluation of a Wearable Powered Foot Orthosis with Metatarsophalangeal Joint

Development and Testing of a User-adaptive Ankle Foot Orthosis

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