Performance validation of an innovative orthotic knee joint based on an optimal four bar linkage

Baydal, J.M.; Barberà, Ricard; Belda, Juanma; Poveda, Rakel; Durá, Juan Vicente; Gomez, Javier A.; García, A. Cruz; Vera, P.

doi:10.1016/s0021-9290(06)83173-8

Cited by 3 publications

(3 citation statements)

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“…We highlight these improvements with respect to passive KAFOs and free-swing orthoses: (1) The adaptation of the knee stiffness with the automatic system, provides sufficient support during stance phase; (2) The training method provides the patient with confidence to prepare for the beginning of the swing phase, while providing an effective free-swinging knee, (3) The actuator provides partial assistance to the knee extension at terminal swing. Each pathological case presents particular characteristics and thus, the mechanical fitting and control system tuning procedures require customisation of the actuator and control systems.…”

Section: Resultsmentioning

confidence: 99%

“…Motions of interest occur at normal (2.6 km/h) and low (2 km/h) gait speeds, and therefore, signals outside the band frequency related to gait kinematics (0.3-20 Hz), were rejected from the sensor outputs (-3 dB low pass filters). A precision angular position sensor (electric range of 340°) was fixed at one rotation axis of the four-bar mechanism of the knee joint, [2], used to track the knee joint angle. A resistive pressure sensor (5 mm in diameter active area, 0.30 mm in thickness) was used to determine the status of the kneelocking mechanism.…”

Section: Sensor Systemmentioning

confidence: 99%

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Immediate effects of a controllable knee ankle foot orthosis for functional compensation of gait in patients with proximal leg weakness

et al. 2007

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Application of intermittent control of the knee joint stiffness in a knee ankle foot orthosis (KAFO) during gait is proposed. The approach combines inertial sensors and an actuator system in order to apply compensation in quadriceps weakness with a wearable device. Two methods, segment-angular rotation based and segment-angular velocity based, are analysed for the control of the knee joint state (intermittent stiffness) based on the inertial sensors signals. Protocolled tests are developed with two post-polio syndrome patients (PPS). In this study, the cases of gait with free-swinging leg and safe stance with the orthotic system are presented in terms of quantified kinematics (average peak angle of knee flexion of 50 degrees ) and evidences of reduction of frequent compensations (e.g. leg lateral movement) in post-polio syndrome patients. The results from immediate inspection indicate an important improvement of the gait patterns in two patients with proximal leg weakness by means of compensations applied by the wearable orthosis.

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Section: Resultsmentioning

confidence: 99%

Section: Sensor Systemmentioning

confidence: 99%

Immediate effects of a controllable knee ankle foot orthosis for functional compensation of gait in patients with proximal leg weakness

et al. 2007

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“…It locks the knee joint. Conversely, when torque is applied in a clockwise direction, the spring unfastens from the adjacent input and output shafts and allows the free knee motion [24][25][26][27][28][29].…”

Section: Advantages and Drawbacksmentioning

confidence: 99%

Stance-Control-Orthoses with Electromechanical Actuation Mechanism: Usefulness, Design Analysis and Directions to Overcome Challenges

Ir¹,

Ao²

2015

J Neurol Neurosci

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Engineers and researchers have devotedly sought to improve and develop the design of lower limb orthosis in the last few decades to enhance the mobility, strength, and endurance of impaired individuals. The achievements in design are impressive, but a myriad of design challenges are still appended in making these designs biomechanically user-friendly and commercially viable. Individuals with weak quadriceps have limited orthotic option to allow independent ambulation. Knee-ankle-foot orthosis (KAFO) are typically prescribed. KAFOs lock the knee in full extension to provide knee stability during walking and keep locked throughout the gait cycle. Locked knee in the swing phase leads to an abnormal gait pattern and causes hip hiking of the braced leg, circumduction and contralateral foot vaulting. Stance control orthosis is designed to release the knee during the swing phase to allow free knee motion and keep the knee locked in full extension during stance. The gait pattern of users then becomes more natural by overcoming the limitations of KAFO. This article analyses designs of various stance control orthosis and prototype with electromechanical actuation mechanism and discusses the design challenges.

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Mechanically Actuated Stance-Control-Orthoses: Advantages, Design Evaluation and Future Directions

Mi¹,

Na²

2015

J Pain Relief

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Performance validation of an innovative orthotic knee joint based on an optimal four bar linkage

Cited by 3 publications

References 0 publications

Immediate effects of a controllable knee ankle foot orthosis for functional compensation of gait in patients with proximal leg weakness

Immediate effects of a controllable knee ankle foot orthosis for functional compensation of gait in patients with proximal leg weakness

Stance-Control-Orthoses with Electromechanical Actuation Mechanism: Usefulness, Design Analysis and Directions to Overcome Challenges

Mechanically Actuated Stance-Control-Orthoses: Advantages, Design Evaluation and Future Directions

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