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      Electromyography data for non-invasive naturally-controlled robotic hand prostheses

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          Abstract

          Recent advances in rehabilitation robotics suggest that it may be possible for hand-amputated subjects to recover at least a significant part of the lost hand functionality. The control of robotic prosthetic hands using non-invasive techniques is still a challenge in real life: myoelectric prostheses give limited control capabilities, the control is often unnatural and must be learned through long training times. Meanwhile, scientific literature results are promising but they are still far from fulfilling real-life needs. This work aims to close this gap by allowing worldwide research groups to develop and test movement recognition and force control algorithms on a benchmark scientific database. The database is targeted at studying the relationship between surface electromyography, hand kinematics and hand forces, with the final goal of developing non-invasive, naturally controlled, robotic hand prostheses. The validation section verifies that the data are similar to data acquired in real-life conditions, and that recognition of different hand tasks by applying state-of-the-art signal features and machine-learning algorithms is possible.

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          Most cited references16

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          A robust, real-time control scheme for multifunction myoelectric control.

          This paper represents an ongoing investigation of dexterous and natural control of upper extremity prostheses using the myoelectric signal (MES). The scheme described within uses pattern recognition to process four channels of MES, with the task of discriminating multiple classes of limb movement. The method does not require segmentation of the MES data, allowing a continuous stream of class decisions to be delivered to a prosthetic device. It is shown in this paper that, by exploiting the processing power inherent in current computing systems, substantial gains in classifier accuracy and response time are possible. Other important characteristics for prosthetic control systems are met as well. Due to the fact that the classifier learns the muscle activation patterns for each desired class for each individual, a natural control actuation results. The continuous decision stream allows complex sequences of manipulation involving multiple joints to be performed without interruption. Finally, minimal storage capacity is required, which is an important factor in embedded control systems.
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            Targeted muscle reinnervation for real-time myoelectric control of multifunction artificial arms.

            Improving the function of prosthetic arms remains a challenge, because access to the neural-control information for the arm is lost during amputation. A surgical technique called targeted muscle reinnervation (TMR) transfers residual arm nerves to alternative muscle sites. After reinnervation, these target muscles produce electromyogram (EMG) signals on the surface of the skin that can be measured and used to control prosthetic arms. To assess the performance of patients with upper-limb amputation who had undergone TMR surgery, using a pattern-recognition algorithm to decode EMG signals and control prosthetic-arm motions. Study conducted between January 2007 and January 2008 at the Rehabilitation Institute of Chicago among 5 patients with shoulder-disarticulation or transhumeral amputations who underwent TMR surgery between February 2002 and October 2006 and 5 control participants without amputation. Surface EMG signals were recorded from all participants and decoded using a pattern-recognition algorithm. The decoding program controlled the movement of a virtual prosthetic arm. All participants were instructed to perform various arm movements, and their abilities to control the virtual prosthetic arm were measured. In addition, TMR patients used the same control system to operate advanced arm prosthesis prototypes. Performance metrics measured during virtual arm movements included motion selection time, motion completion time, and motion completion ("success") rate. The TMR patients were able to repeatedly perform 10 different elbow, wrist, and hand motions with the virtual prosthetic arm. For these patients, the mean motion selection and motion completion times for elbow and wrist movements were 0.22 seconds (SD, 0.06) and 1.29 seconds (SD, 0.15), respectively. These times were 0.06 seconds and 0.21 seconds longer than the mean times for control participants. For TMR patients, the mean motion selection and motion completion times for hand-grasp patterns were 0.38 seconds (SD, 0.12) and 1.54 seconds (SD, 0.27), respectively. These patients successfully completed a mean of 96.3% (SD, 3.8) of elbow and wrist movements and 86.9% (SD, 13.9) of hand movements within 5 seconds, compared with 100% (SD, 0) and 96.7% (SD, 4.7) completed by controls. Three of the patients were able to demonstrate the use of this control system in advanced prostheses, including motorized shoulders, elbows, wrists, and hands. These results suggest that reinnervated muscles can produce sufficient EMG information for real-time control of advanced artificial arms.
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              Influence of anatomical, physical, and detection-system parameters on surface EMG.

              Many previous studies were focused on the influence of anatomical, physical, and detection-system parameters on recorded surface EMG signals. Most of them were conducted by simulations. Previous EMG models have been limited by simplifications which did not allow simulation of several aspects of the EMG generation and detection systems. We recently proposed a model for fast and accurate simulation of the surface EMG. It characterizes the volume conductor as a non-homogeneous and anisotropic medium, and allows simulation of EMG signals generated by finite-length fibers without approximation of the current-density source. The influence of thickness of the subcutaneous tissue layers, fiber inclination, fiber depth, electrode size and shape, spatial filter transfer function, interelectrode distance, length of the fibers on surface, single-fiber action-potential amplitude, frequency content, and estimated conduction velocity are investigated in this paper. Implications of the results on electrode positioning procedures, spatial filter design, and EMG signal interpretation are discussed.
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                Author and article information

                Journal
                Sci Data
                Sci Data
                Scientific Data
                Nature Publishing Group
                2052-4463
                23 December 2014
                2014
                : 1
                : 140053
                Affiliations
                [1 ]Information Systems Institute at the University of Applied Sciences Western Switzerland (HES-SO Valais) , Technoark 3, 3960 Sierre, Switzerland
                [2 ] Institute de Recherche Idiap , Rue Marconi 19, 1920 Martigny, Switzerland
                [3 ] Robotics and Mechatronics Center, DLR—German Aerospace Center , Muenchener Strasse 20, 82234 Oberpfaffenhofen, Germany
                [4 ] Department of Computer, Control, and Management Engineering, University of Rome La Sapienza , via Ariosto 25, 00185 Roma, Italy
                [5 ] Department of Physical Therapy at the University of Applied Sciences Western Switzerland (HES-SO Valais) , Rathausstrasse 8, 3954 Leukerbad, Switzerland
                [6 ] Clinic of Plastic Surgery, Padova University Hospital , Via Giustiniani 2, 35128 Padova, Italy
                Author notes
                [a ] M.A. (email: manfredo.atzori@ 123456hevs.ch )
                []

                Manfredo Atzori created the acquisition protocol, did data acquisition, performed data analysis and wrote the paper. Arjan Gijsberts created the data acquisition software and reviewed the paper. Claudio Castellini ideated the project, created the data acquisition software and reviewed the paper. Barbara Caputo ideated and planned the project and reviewed the paper. Anne Gabrielle Mittaz-Hager created the acquisition protocol, participated to data acquisition and reviewed the paper. Simone Elsig created the acquisition protocol, recruited subjects, participated to data acquisition and reviewed the paper. Giorgio Giatsidis recruited subjects, participated to data acquisition and reviewed the paper. Franco Bassetto recruited subjects, participated to data acquisition and reviewed the paper. Henning Müller ideated and planned the project and reviewed the paper.

                Article
                sdata201453
                10.1038/sdata.2014.53
                4421935
                25977804
                66538eba-1ff2-444f-a84f-390f2ddc88cb
                Copyright © 2014, Macmillan Publishers Limited

                This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0 Metadata associated with this Data Descriptor is available at http://www.nature.com/sdata/ and is released under the CC0 waiver to maximize reuse.

                History
                : 15 August 2014
                : 24 November 2014
                Categories
                Data Descriptor

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