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https://www.readbyqxmd.com/read/28905686/long-term-results-of-early-myoelectric-prosthesis-fittings-a-prospective-case-control-study
#1
Lis Sjöberg, Helen Lindner, Liselotte Hermansson
BACKGROUND: Different recommendations exist regarding what age is best for first-time fitting of myoelectric hand prostheses in children. OBJECTIVES: To compare prosthetic skill, prosthetic use and risk for rejection over time between children fitted with myoelectric hand prostheses before or after 2½ years of age. STUDY DESIGN: Prospective case-control design. METHODS: The cases were nine children fitted with myoelectric hand prostheses before the age of 2½ years, whereas the controls were 27 children who were fitted with myoelectric hand prostheses after the age of 2½ years...
September 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28900569/there-are-no-biomechanical-differences-between-runners-classified-by-the-functional-movement-screen
#2
Rodrigo Ribeiro de Oliveira, Shalimá Figueirêdo Chaves, Yuri Lopes Lima, Márcio Almeida Bezerra, Gabriel Peixoto Leão Almeida, Pedro Olavo de Paula Lima
BACKGROUND: Running has been one of the main choices of physical activity in people seeking an active lifestyle. The Functional Movement Screen (FMS™) is a screening tool that aims to discern movement competency. PURPOSE: The purposes of this study were to compare biomechanical characteristics between two groups rated using the composite FMS™ score, and to analyze the influence of specific individual tests. The hypothesis was that the group that scored above 14 would demonstrate better performance on biomechanical tests than the group that scored below 14...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28890685/emg-based-continuous-and-simultaneous-estimation-of-arm-kinematics-in-able-bodied-individuals-and-stroke-survivors
#3
Jie Liu, Sang Hoon Kang, Dali Xu, Yupeng Ren, Song Joo Lee, Li-Qun Zhang
Among the potential biological signals for human-machine interactions (brain, nerve, and muscle signals), electromyography (EMG) widely used in clinical setting can be obtained non-invasively as motor commands to control movements. The aim of this study was to develop a model for continuous and simultaneous decoding of multi-joint dynamic arm movements based on multi-channel surface EMG signals crossing the joints, leading to application of myoelectrically controlled exoskeleton robots for upper-limb rehabilitation...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28868150/electrocardiograph-signal-denoising-based-on-sparse-decomposition
#4
Junjiang Zhu, Xiaolu Li
Noise in ECG signals will affect the result of post-processing if left untreated. Since ECG is highly subjective, the linear denoising method with a specific threshold working well on one subject could fail on another. Therefore, in this Letter, sparse-based method, which represents every segment of signal using different linear combinations of atoms from a dictionary, is used to denoise ECG signals, with a view to myoelectric interference existing in ECG signals. Firstly, a denoising model for ECG signals is constructed...
August 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28832013/model-and-experiments-to-optimize-co-adaptation-in-a-simplified-myoelectric-control-system
#5
Mathilde Couraud, Daniel Cattaert, Florent Paclet, Pierre-Yves Oudeyer, Aymar de Rugy
OBJECTIVE: To compensate for a limb lost in an amputation, myoelectric prostheses use surface electromyography (EMG) from the remaining muscles to control the prosthesis. Despite considerable progress, myoelectric controls remain markedly different from the way we normally control movements, and require intense user adaptation. To overcome this, our goal is to explore concurrent machine co-adaptation techniques that are developed in the field of brain-machine interface, and that are beginning to be used in myoelectric controls...
August 23, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28814052/grasp-specific-and-user-friendly-interface-design-for-myoelectric-hand-prostheses
#6
Alireza Mohammadi, Jim Lavranos, Rob Howe, Peter Choong, Denny Oetomo
This paper presents the design and characterisation of a hand prosthesis and its user interface, focusing on performing the most commonly used grasps in activities of daily living (ADLs). Since the operation of a multi-articulated powered hand prosthesis is difficult to learn and master, there is a significant rate of abandonment by amputees in preference for simpler devices. In choosing so, amputees chose to live with fewer features in their prosthesis that would more reliably perform the basic operations...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28814036/prosthetic-design-directives-low-cost-hands-within-reach
#7
G K Jones, A Rosendo, R Stopforth
Although three million people around the world suffer from the lack of one or both upper limbs 80% of this number is located within developing countries. While prosthetic prices soar with technology 3D printing and low cost electronics present a sensible solution for those that cannot afford expensive prosthetics. The electronic and control design of a low-cost prosthetic hand, the Touch Hand II, is discussed. This paper shows that sensorless techniques can be used to reduce design complexities, costs, and provide easier access to the electronics...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28814025/learning-from-demonstration-teaching-a-myoelectric-prosthesis-with-an-intact-limb-via-reinforcement-learning
#8
Gautham Vasan, Patrick M Pilarski
Prosthetic arms should restore and extend the capabilities of someone with an amputation. They should move naturally and be able to perform elegant, coordinated movements that approximate those of a biological arm. Despite these objectives, the control of modern-day prostheses is often nonintuitive and taxing. Existing devices and control approaches do not yet give users the ability to effect highly synergistic movements during their daily-life control of a prosthetic device. As a step towards improving the control of prosthetic arms and hands, we introduce an intuitive approach to training a prosthetic control system that helps a user achieve hard-to-engineer control behaviours...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28814013/a-third-arm-design-of-a-bypass-prosthesis-enabling-incorporation
#9
Adam W Wilson, Daniel H Blustein, Jon W Sensinger
A variety of factors affect the performance of a person using a myoelectric prosthesis, including increased control noise, reduced sensory feedback, and muscle fatigue. Many studies use able-bodied subjects to control a myoelectric prosthesis using a bypass socket in order to make comparisons to movements made with intact limbs. Depending on the goals of the study, this approach can also allow for greater subject numbers and more statistical power in the analysis of the results. As we develop assessment tools and techniques to evaluate how peripheral nerve interfaces impact prosthesis incorporation, involving normally limbed subjects in the studies becomes challenging...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28814002/joint-based-velocity-feedback-to-virtual-limb-dynamic-perturbations
#10
Eric J Earley, Kyle J Kaveny, Reva E Johnson, Levi J Hargrove, Jon W Sensinger
Despite significant research developing myoelectric prosthesis controllers, many amputees have difficulty controlling their devices due in part to reduced sensory feedback. Many attempts at providing supplemental sensory feedback have not significantly aided control. We hypothesize this is because the feedback provided contains redundant information already provided by vision. However, whereas vision provides egocentric, position-based feedback, sensory feedback tied to joint coordinates may provide information complementary to vision...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813991/voluntary-phantom-hand-and-finger-movements-in-transhumerai-amputees-could-be-used-to-naturally-control-polydigital-prostheses
#11
Nathanael Jarrasse, Caroline Nicol, Florian Richer, Amelie Touillet, Noel Martinet, Jean Paysant, Jozina B De Graaf
An arm amputation is extremely invalidating since many of our daily tasks require bi-manual and precise control of hand movements. Perfect hand prostheses should therefore offer a natural, intuitive and cognitively simple control over their numerous biomimetic active degrees of freedom. While efficient polydigital prostheses are commercially available, their control remains complex to master and offers limited possibilities, especially for high amputation levels. In this pilot study, we demonstrate the possibility for upper-arm amputees to intuitively control a polydigital hand prosthesis by using surface myoelectric activities of residual limb muscles (sEMG) associated with phantom limb movements, even if these residual arm muscles on which the phantom activity is measured were not naturally associated with hand movements before amputation...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813907/position-and-stiffness-modulation-of-a-wrist-haptic-device-using-myoelectric-interface
#12
Chris Wilson Antuvan, Lorenzo Masia
Modulation of stiffness provides a great deal of advantage in the way humans interact with the environment, and is very important in successfully performing activities of daily living. In the context of human-machine interactions, stiffness control could provide a safer interaction, especially when dealing with unpredictable environment. In this paper we propose a user-modulated stiffness and position control for the wrist flexion/extension degree of freedom while physically coupled to a haptic device. A virtual position tracking experiment in a varying external force field is designed in order to test the performance of the control strategy with and without co-contraction techniques...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813888/fully-embedded-myoelectric-control-for-a-wearable-robotic-hand-orthosis
#13
Franziska Ryser, Tobias Butzer, Jeremia P Held, Olivier Lambercy, Roger Gassert
To prevent learned non-use of the affected hand in chronic stroke survivors, rehabilitative training should be continued after discharge from the hospital. Robotic hand orthoses are a promising approach for home rehabilitation. When combined with intuitive control based on electromyography, the therapy outcome can be improved. However, such systems often require extensive cabling, experience in electrode placement and connection to external computers. This paper presents the framework for a stand-alone, fully wearable and real-time myoelectric intention detection system based on the Myo armband...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813834/comparing-neural-control-and-mechanically-intrinsic-control-of-powered-ankle-exoskeletons
#14
Jeffrey R Koller, C David Remy, Daniel P Ferris
There are an infinite number of ways to control an assistive robotic device; however, there is little consensus on which ways are better than others and why. We designed this study to compare the control of powered ankle exoskeletons using neural measurements to drive control versus that using mechanically intrinsic measurements. The controller driven by neural measurements was a dynamic gain proportional myoelectric controller using user's soleus muscle activity for an actuation signal. The controller driven by mechanically intrinsic measurements was a timing-based controller using detected heel-strikes of the user to appropriately time actuation...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813818/the-effect-of-myoelectric-prosthesis-control-strategies-and-feedback-level-on-adaptation-rate-for-a-target-acquisition-task
#15
Ahmed W Shehata, Erik J Scheme, Jonathon W Sensinger
The long-term performance of myoelectric prostheses is related not only to the short-term performance of the controller, but also to the user's ability to learn and adapt to the system. Different control architectures may have inherent tradeoffs between their short-term performance and the amount of relevant feedback that informs this adaptation. In this study we focused on the ability of two common types of myoelectric control interfaces: raw control with raw feedback, such as a regression, and filtered control with filtered feedback, such as a classifier, to affect user adaptation...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813812/characterization-of-surface-electromyography-patterns-of-healthy-and-incomplete-spinal-cord-injury-subjects-interacting-with-an-upper-extremity-exoskeleton
#16
Craig G McDonald, Troy A Dennis, Marcia K O'Malley
Rehabilitation exoskeletons may make use of myoelectric control to restore in patients with significant motor impairment following a spinal cord injury (SCI) a sense of volitional control over their limb - a crucial component for recovery of movement. Little investigation has been done into the feasibility of using surface electromyography (sEMG) as an exoskeleton control interface for SCI patients, whose impairment manifests in a highly variable way across the patient population. We have demonstrated that by using only a small subset of features extracted from eight bipolar electrodes recording on the upper arm and forearm muscles, we can achieve high predictive accuracy for the intended direction of motion...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813806/design-of-continuous-emg-classification-approaches-towards-the-control-of-a-robotic-exoskeleton-in-reaching-movements
#17
Nerea Irastorza-Landa, Andrea Sarasola-Sanz, Eduardo Lopez-Larraz, Carlos Bibian, Parid Shiman, Niels Birbaumer, Ander Ramos-Murguialday
Myoelectric control of rehabilitation devices engages active recruitment of muscles for motor task accomplishment, which has been proven to be essential in motor rehabilitation. Unfortunately, most electromyographic (EMG) activity-based controls are limited to one single degree-of-freedom (DoF), not permitting multi-joint functional tasks. On the other hand, discrete EMG-triggered approaches fail to provide continuous feedback about muscle recruitment during movement. For such purposes, myoelectric interfaces for continuous recognition of functional movements are necessary...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813803/application-of-support-vector-machines-in-detecting-hand-grasp-gestures-using-a-commercially-off-the-shelf-wireless-myoelectric-armband
#18
Farshid Amirabdollahian, Michael L Walters
The propose of this study was to assess the feasibility of using support vector machines in analysing myoelectric signals acquired using an off the shelf device, the Myo armband from Thalmic Lab, when performing hand grasp gestures. Participants (n = 26) took part in the study wearing the armband and producing a series of required gestures. Support vector machines were used to train a model using participant training values, and to classify gestures produced by the same participants. Different Kernel functions and electrode combinations were studied...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28810999/case-report-on-the-use-of-a-custom-myoelectric-elbow-wrist-hand-orthosis-for-the-remediation-of-upper-extremity-paresis-and-loss-of-function-in-chronic-stroke
#19
Stefanie Dunaway, D Brianna Dezsi, Jessica Perkins, Daniel Tran, Jonathan Naft
INTRODUCTION: This case study describes the application of a commercially available, custom myoelectric elbow-wrist-hand orthosis (MEWHO), on a veteran diagnosed with chronic stroke with residual left hemiparesis. The MEWHO provides powered active assistance for elbow flexion/extension and 3 jaw chuck grip. It is a noninvasive orthosis that is driven by the user's electromyographic signal. Experience with the MEWHO and associated outcomes are reported. MATERIALS AND METHODS: The participant completed 21 outpatient occupational therapy sessions that incorporated the use of a custom MEWHO without grasp capability into traditional occupational therapy interventions...
July 2017: Military Medicine
https://www.readbyqxmd.com/read/28783455/environmental-barriers-to-participation-and-facilitators-for-use-of-three-types-of-assistive-technology-devices
#20
Cathrine Widehammar, Helene Lidström, Liselotte Hermansson
The aim was to compare the presence of environmental barriers to participation and facilitators for assistive technology (AT) use and study the relation between barriers and AT use in three different AT devices. A cross-sectional survey was conducted. Inclusion criteria were ≥one year of experience as a user of myoelectric prosthesis (MEP), powered mobility device (PMD), or assistive technology for cognition (ATC) and age 20-90 years. Overall, 156 participants answered the Swedish version of the Craig Hospital Inventory of Environmental Factors and a study-specific questionnaire on facilitating factors...
August 7, 2017: Assistive Technology: the Official Journal of RESNA
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