A bilateral electro-hydraulic actuator system to measure dynamic ankle joint stiffness during upright human stance

Author

Forster, S.M. ; Wagner, R. ; Kearney, Robert E.

Author_Institution

Dept. of Biomed. Eng., McGill Univ., Montreal, Que., Canada

Volume

2

fYear

2003

fDate

17-21 Sept. 2003

Firstpage

1507

Abstract

A bilateral electro-hydraulic actuator system has been developed to measure the dynamic joint stiffness of the human ankle during standing. The apparatus consists of two foot pedals that are each connected to an electro hydraulic rotary actuator. Transducers are incorporated to measure the position and torque of each actuator, the angle of the ankle with respect to the foot plate, and the positions of the knee and hip. Nonlinear identification techniques will be used to determine the reflex contribution to the overall torque.

Keywords

biocontrol; biomedical transducers; bone; elasticity; gait analysis; hydraulic actuators; mechanoception; muscle; neurophysiology; plates (structures); position measurement; torque measurement; bilateral electro-hydraulic actuator system; dynamic ankle joint stiffness; electro hydraulic rotary actuator; foot pedals; foot plate; foot posture; intrinsic stiffness; nonlinear identification techniques; position measurement; reflex contribution; stretch reflex; torque measurement; upright human stance; Actuators; Biomedical measurements; Foot; Humans; Mechanical factors; Muscles; Nervous system; Open loop systems; Position measurement; Torque measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 2003. Proceedings of the 25th Annual International Conference of the IEEE

ISSN

1094-687X

Print_ISBN

0-7803-7789-3

Type

conf

DOI

10.1109/IEMBS.2003.1279630

Filename

1279630