Browsing by Keyword "Functional Electrical Stimulation"
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Item Feasibility of Using Neuro-Fuzzy Subject-Specific Models for Functional Electrical Stimulation Induced Hand Movements(2015-09-01) Imatz-Ojanguren, Eukene; Irigoyen, Eloy; Valencia, David; Keller, Thierry; Tecnalia Research & Innovation; Medical TechnologiesFunctional Electrical Stimulation (FES) is a technique that artificially elicits muscle contractions and it is used to restore motor/sensory functions in both assistive and therapeutic applications. The use of multi-field surface electrodes is a novel popular approach in transcutaneous FES applications. Lately, hybrid systems that combine artificial neural networks and fuzzy logic have also been proposed for many applications in different areas. This paper presents the possibility of combining both approaches for obtaining subject-specific models of FES induced hand movements for grasping applications. Data of the hand and finger motion from two subjects affected by acquired brain injury were used to train two different approaches: coactive neuro-fuzzy inference system and recurrent fuzzy neural network. Preliminary results show that these approaches can be considered in modelling applications for their ability to learn and predict main characteristics of the system, as well as providing useful information from the original system that could be interpreted as subject-specific knowledge.Item Usability study of a device for compensation of foot drop based on FES and surface multi-field electrodes in a clinical environment(2017-07) Imatz-Ojanguren, Eukene; Sánchez-Márquez, Gema; Asiain-Aristu, Jose Ramón; Cueto-Mendo, Joxean; Jaunarena-Goicoechea, Edurne; Zabaleta, Haritz; Keller, Thierry; Tecnalia Research & InnovationFunctional Electrical Stimulation (FES) has shown successful assistive and rehabilitation effects in people affected by foot drop dysfunction caused by neurological disorders [1]. Still, FES-based foot drop devices are not present in regular therapy programs of many countries due to barriers caused by technological, usability or reliability issues [2]. FES devices based on surface multi-field electrodes bring new broader stimulation possibilities and features like compensation of eversion/inversion and thus, potentially increase the configuration options. In this study, the satisfaction and usability aspects of a multi-field based FES device were analyzed in a clinical environment. Method The FES device used in this study was the Fesia Walk device for compensation of foot drop, which is based on a multi-field surface electrode and an inertial sensor for gait phase detection. 10 acquired brain injury subjects in chronic stage and 4 therapists participated in the study. The therapists received a two-hour training session prior to the therapy sessions. Every subject was assigned to one therapist and received 3 sessions of habituation and 6 sessions of over ground walking with the Fesia Walk during three weeks. Both therapists and users were evaluated with the Quebec User Evaluation of Satisfaction with Assistive Technology (QUEST). Additionally, the therapists were evaluated with the System Usability Scale (SUS). An individual interview was carried out with each of the participants. Results The device received good scores in both the QUEST and SUS scales, with mean scores of 4.14 out of 5 and 85.6 out of 100 respectively. Furthermore, most users and all therapists showed interest to continue using the device after the study. Discussion and conclusions This usability study indicated that it is possible to include surface multi-field based FES devices for the compensation of foot drop in practical therapeutic programs and that they can be used as regular tools by therapists in clinical environments.Item Workshop on Transcutaneous Functional Electrical Stimulation(Springer, Cham, 2015-10) Imatz Ojanguren, Eukene; Kostic, Milos; Chia Bejarano, Noelia; Keller, Thierry; Tecnalia Research & Innovation; Medical Technologies; SGThis chapter aims to give a general description of basic concepts related to transcutaneous FES. It offers examples of simple exercises to introduce the reader into the practical aspects of the application of transcutaneous FES. Different influencing aspects such as stimulation waveform, stimulation parameters, electrode type, placement, and size are analyzed. Available models related to FES that represent the electrical properties of the skin, current distribution on the skin, or either nerve excitability are presented as well, highlighting those factors that affect most transcutaneous FES applications. A practical guide on upper and lower limb is also presented, where different exercises are proposed to experience previously described theoretical aspects in practical application of FES. Finally, conclusions of the chapter and challenges observed during the exercises are described and novel techniques and technology used to overcome some of these challenges are mentioned.