Weight Distribution of a Knee Exoskeleton Influences Muscle Activities During Movements

Liu, Yi-Xing; Zhang, Longbin; Wang, Ruoli; Smith, Christian; Gutierrez-Farewik, Elena M.

doi:10.1109/access.2021.3091649

Cited by 14 publications

(7 citation statements)

References 40 publications

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“…Thereby, translation and rotation of the device to the human model is possible, the execution depends on the studied use case ( Arch et al, 2016 ; Moosavian et al, 2018 ; Fritzsche et al, 2022 ). The connection is done via kinematic constraints ( To et al, 2005 ; Panero et al, 2019 ; Liu et al, 2021 ) or defined joints (e.g., in OpenSim via FreeJoint or CustomJoint) ( Zhu et al, 2013 ; Zhou et al, 2015 ; Arch et al, 2016 ). Furthermore, the AnyBody modelling software ( Damsgaard et al, 2006 ; AnyBody Technology, 2022 ) provides a possibility to set the fixed connection between the device and DHM as soft, which allows small relative motions ( Zhou et al, 2017 ; Fritzsche et al, 2022 ).…”

Section: Resultsmentioning

confidence: 99%

“…The relative motion is mainly realized by allowing additional degrees of freedom between WAD and DHM, again having to be aware of viable kinematic chains. In the most publications either one ( To et al, 2005 ; Arch et al, 2016 ) or two degrees of freedom ( Panero et al, 2020 ; Liu et al, 2021 ) per fixation point are modelled at most. Due to the kinematic redundancy ( Yang et al, 2007 ) this limitation of degrees of freedom is necessary to allow the model to solve the present problem.…”

Section: Discussionmentioning

confidence: 99%

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Modelling the interaction between wearable assistive devices and digital human models—A systematic review

Scherb

Wartzack

Miehling

2023

Front. Bioeng. Biotechnol.

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Exoskeletons, orthoses, exosuits, assisting robots and such devices referred to as wearable assistive devices are devices designed to augment or protect the human body by applying and transmitting force. Due to the problems concerning cost- and time-consuming user tests, in addition to the possibility to test different configurations of a device, the avoidance of a prototype and many more advantages, digital human models become more and more popular for evaluating the effects of wearable assistive devices on humans. The key indicator for the efficiency of assistance is the interface between device and human, consisting mainly of the soft biological tissue. However, the soft biological tissue is mostly missing in digital human models due to their rigid body dynamics. Therefore, this systematic review aims to identify interaction modelling approaches between wearable assistive devices and digital human models and especially to study how the soft biological tissue is considered in the simulation. The review revealed four interaction modelling approaches, which differ in their accuracy to recreate the occurring interactions in reality. Furthermore, within these approaches there are some incorporating the appearing relative motion between device and human body due to the soft biological tissue in the simulation. The influence of the soft biological tissue on the force transmission due to energy absorption on the other side is not considered in any publication yet. Therefore, the development of an approach to integrate the viscoelastic behaviour of soft biological tissue in the digital human models could improve the design of the wearable assistive devices and thus increase its efficiency and efficacy.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Modelling the interaction between wearable assistive devices and digital human models—A systematic review

Scherb

Wartzack

Miehling

2023

Front. Bioeng. Biotechnol.

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“…Not only ROM but also electromyography (EMG) measurements have been taken into account for this task. Because EMG provides information about muscle activity [18], EMG devices can be used in a variety of fields, including biomedical, physiotherapy, and sports performance applications, where it is critical to assess muscle behavior throughout the task [19], based on changes in the electrical signal [20], [21]. According to the literature review, the development and evaluation of knee ROM and EMG measurements and systems are summarized in Table 1, and a comparison of the existing works and this work is also provided in the table.…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of range of motion and surface electromyography data for a knee rehabilitation device

Sengchuai,

Sittiruk,

Booranawong

et al. 2024

IJECE

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This work introduces a statistical analysis of knee range of motion (ROM) and surface electromyography (EMG) data gathered from a knee extension rehabilitation device. Real-time ROM and EMG signals of rehabilitation users are measured using a single angle sensor and a two-channel EMG device (for the vastus lateralis and vastus medialis muscles). These signals are collected by the NI-myRIO embedded device in accordance with the designed rehabilitation program. The main contribution and novelty of this study is that real-time signals are automatically processed and transformed into statistical data for use by users and medical experts. A solution for extracting raw signals is proposed, in which several statistical functions such as range, mean, standard deviation, skewness, percentiles, interquartile range, and total knee holding times above the threshold level, are implemented and applied. The proposed solution is tested using data acquired from healthy people, which includes gender, age, body size, knee side, exercise behavior, and surgical experience. Results indicated that real-time signals and related statistical data on the knee’s performance can be efficiently monitored. With this solution, rehabilitation users can practice and learn about their knee performance, while medical experts can evaluate the data and design the best rehabilitation program for users.

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“…They found that increasing either the added weight or moment of inertia result in an increase in energy cost compared to a baseline setup. Another study ( Liu et al, 2021 ) evaluated the effects of weight distribution of exoskeletons on muscle activities. They created four knee exoskeletons using identical components, with a different motor and gear box positioning.…”

Section: Introductionmentioning

confidence: 99%

“…Another study (Liu et al, 2021) evaluated the effects of weight distribution of exoskeletons on muscle activities. They created four knee exoskeletons using identical components, with a different motor and gear box positioning.…”

mentioning

confidence: 99%

Ergonomic dual four-bar linkage knee exoskeleton for stair ascent assistance

Kittisares,

Ide,

Nabae

et al. 2023

Front. Robot. AI

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Introduction: Robotic exoskeletons are emerging technologies that have demonstrated their effectiveness in assisting with Activities of Daily Living. However, kinematic disparities between human and robotic joints can result in misalignment between humans and exoskeletons, leading to discomfort and potential user injuries.Methods: In this paper, we present an ergonomic knee exoskeleton based on a dual four-bar linkage mechanism powered by hydraulic artificial muscles for stair ascent assistance. The device comprises two asymmetric four-bar linkage mechanisms on the medial and lateral sides to accommodate the internal rotation of the knee and address the kinematic discrepancies between these sides. A genetic algorithm was employed to optimize the parameters of the four-bar linkage mechanism to minimize misalignment between human and exoskeleton knee joints. The proposed device was evaluated through two experiments. The first experiment measured the reduction in undesired load due to misalignment, while the second experiment evaluated the device’s effectiveness in assisting stair ascent in a healthy subject.Results: The experimental results indicate that the proposed device has a significantly reduced undesired load compared to the traditional revolute joint, decreasing from 14.15 N and 18.32 N to 1.88 N and 1.07 N on the medial and lateral sides, respectively. Moreover, a substantial reduction in muscle activities during stair ascent was observed, with a 55.94% reduction in surface electromyography signal.Discussion: The reduced undesired load of the proposed dual four-bar linkage mechanism highlights the importance of the adopted asymmetrical design for reduced misalignment and increased comfort. Moreover, the proposed device was effective at reducing the effort required during stair ascent.

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Weight Distribution of a Knee Exoskeleton Influences Muscle Activities During Movements

Cited by 14 publications

References 40 publications

Modelling the interaction between wearable assistive devices and digital human models—A systematic review

Modelling the interaction between wearable assistive devices and digital human models—A systematic review

Statistical analysis of range of motion and surface electromyography data for a knee rehabilitation device

Ergonomic dual four-bar linkage knee exoskeleton for stair ascent assistance

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