A Novel Application of Eddy Current Braking for Functional Strength Training During Gait

Washabaugh, Edward P.; Claflin, E. S.; Gillespie, R. Brent; Krishnan, Chandramouli

doi:10.1007/s10439-016-1553-2

Cited by 33 publications

(57 citation statements)

References 53 publications

(59 reference statements)

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“…Further, the clinical utility of webcam-based motion tracking is high as only minimal expertise is required to operate this system. The real-time processing of kinematic data also allows for the provision of kinematic biofeedback, which could be useful in facilitating therapeutic outcomes [11, 12]. For these reasons, webcam-based motion tracking can serve as a suitable alternative when 3D systems are unavailable.…”

Section: Discussionmentioning

confidence: 99%

Reliable sagittal plane kinematic gait assessments are feasible using low-cost webcam technology

2017

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Three-dimensional (3-D) motion capture systems are commonly used for gait analysis because they provide reliable and accurate measurements. However, the downside of this approach is that it is expensive and requires technical expertise; thus making it less feasible in the clinic. To address this limitation, we recently developed and validated (using a high-precision walking robot) a low-cost, two-dimensional (2-D) real-time motion tracking approach using a simple webcam and LabVIEW Vision Assistant. The purpose of this study was to establish the repeatability and minimal detectable change values of hip and knee sagittal plane gait kinematics recorded using this system. Twenty-one healthy subjects underwent two kinematic assessments while walking on a treadmill at a range of gait velocities. Intraclass correlation coefficients (ICC) and minimal detectable change (MDC) values were calculated for commonly used hip and knee kinematic parameters to demonstrate the reliability of the system. Additionally, Bland-Altman plots were generated to examine the agreement between the measurements recorded on two different days. The system demonstrated good to excellent reliability (ICC > 0.75) for all the gait parameters tested on this study. The MDC values were typically low (< 5°) for most of the parameters. The Bland-Altman plots indicated that there was no systematic error or bias in kinematic measurements and showed good agreement between measurements obtained on two different days. These results indicate that kinematic gait assessments using webcam technology can be reliably used for clinical and research purposes.

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Section: Discussionmentioning

confidence: 99%

Reliable sagittal plane kinematic gait assessments are feasible using low-cost webcam technology

2017

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“…We note that this list is not exhaustive, and other types of brakes (e.g., eddy current brakes) could have been applied. 43 The magnetic particle brakes were chosen for this application because they are of moderate cost and provide a feeling similar to dry friction, which is a more predictable force profile. Additionally, they are under direct electronic control and have actuation times similar to smart fluid brakes (14 ms), however there is some hysteresis in the torque profile of the brake.…”

Section: Methodsmentioning

confidence: 99%

A Semi-passive Planar Manipulandum for Upper-Extremity Rehabilitation

et al. 2018

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Robotic rehabilitation is a promising approach to treat individuals with neurological or orthopedic disorders. However, despite significant advancements in the field of rehabilitation robotics, this technology has found limited traction in clinical practice. A key reason for this issue is that most robots are expensive, bulky, and not scalable for in-home rehabilitation. Here, we introduce a semi-passive rehabilitation robot (SepaRRo) that uses controllable passive actuators (i.e., brakes) to provide controllable resistances at the end-effector over a large workspace in a manner that is cost-effective and safe for in-home use. We also validated the device through theoretical analyses, hardware experiments, and human subject experiments. We found that by including kinematic redundancies in the robot's linkages, the device was able to provide controllable resistances to purely resist the movement of the end-effector, or to gently steer (i.e., perturb) its motion away from the intended path. When testing these capabilities on human subjects, we found that many of the upper-extremity muscles could be selectively targeted based on the forcefield prescribed to the user. These results indicate that SepaRRo could serve as a low-cost therapeutic tool for upper-extremity rehabilitation; however, further testing is required to evaluate its therapeutic benefits in patient population.

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“…There are numerous passive actuators that could provide scalable resistance for a robotic device. We selected custom miniature passive eddy current brakes to act at each of the robot's joints [45]. Eddy current brakes are a low-cost and easily scalable method for providing viscous (i.e., velocity dependent) resistance.…”

Section: B Selecting a Passive Actuator: The Eddy Current Brakementioning

confidence: 99%

“…For eddy current disc brakes, the resistive torque, τ, is determined by the following equation: [45], [53], [54]…”

Section: B Selecting a Passive Actuator: The Eddy Current Brakementioning

confidence: 99%

A Portable Passive Rehabilitation Robot for Upper-Extremity Functional Resistance Training

Washabaugh

Guo

Chang

et al. 2019

IEEE Trans. Biomed. Eng.

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A Novel Application of Eddy Current Braking for Functional Strength Training During Gait

Cited by 33 publications

References 53 publications

Reliable sagittal plane kinematic gait assessments are feasible using low-cost webcam technology

Reliable sagittal plane kinematic gait assessments are feasible using low-cost webcam technology

A Semi-passive Planar Manipulandum for Upper-Extremity Rehabilitation

A Portable Passive Rehabilitation Robot for Upper-Extremity Functional Resistance Training

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