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Many micromachined neural implants with multi-channel thin-film electrodes have been presented over the last decades. A transverse intrafascicular multi-channel electrode (TIME) was developed for translational research to treat phantom limb pain (PLP). Four TIME systems (latest electrode version) have been implanted for 30 days into the arm of an amputee. After finishing successfully the clinical...
The experiment is to investigate the reliability of two different mechanomyogram (MMG) sensors recording during functional electrical stimulation (FES)-evoked contraction. The MMG based sensors used in this study are vibromyography (VMG) and muscle contraction (MC) sensor. One spinal cord injured (SCI) patient was requested to perform knee extension movements during two sessions of isotonic exercise...
FES rowing is a complete whole body exercise that has potential to provide aerobic and muscle training benefits for individuals with SCI. Current FES rowing systems comprise ‘fixed’ stretcher designs whereby the disabled rower moves their seated body mass over a sliding bar while the foot stretcher remains fixed. The present work describes the development of an alternate ergometer design for FES rowing,...
It is important to close the control loop by providing tactile feedback to prosthesis users. An increasing number of researchers attempt to improve grasping performance by providing various types of tactile feedbacks. In our study, we improve the performance by a virtual environment in which subjects acquire two key grasping-related properties, including object's stiffness, economically holding power...
Functional Electrical Stimulation (FES), a method to regain lost body functions by means of electricity, operates in a multidisciplinary field where engineers, therapists and medical doctors have to work close together for the patients benefits. Many applications were investigated since the early 1960's. Implantable and surface stimulation systems were used, various sensors, algorithms, stimulation...
The purpose of this study was to investigate the effects of different foot positioning on bilateral erector spinae (ES) and gluteus maximaus (GM) activation during sit-to-stand in stroke patients using surface electromyography(EMG). Fifteen randomly selected stroke patients participated and were required to perform sit-to-stand (STS) with three different strategies as follows: 1) symmetric foot position,...
This paper describes a new kind of multi-channel electrode for selectively interfacing the muscular system. Application of the system is similar to conventional intramuscular wire electrodes. A flexible polyimide thin-film structure is attached to a cannula which can be inserted into the muscle. The cannula can then be removed, so that only the polyimide electrode remains inside the muscle. Based...
This paper focuses on the volitional contraction's impact on Functional Electrical Stimulation (FES). Hammerstein model, which combines static nonlinearity, isometric response curve (IRC), and dynamical linearity, is a common model to present the muscle response to electrical stimulation. We utilized the responses to a pseudo-random binary sequence (PRBS) excitation to identify the static nonlinearity...
This paper presents a modular control framework for control of the ankle movement using intraspinal microstimulation. The control strategy is based on sliding mode control (SMC). The major advantage of sliding-mode controller is its insensitivity to parameter variations and external load disturbance. The structure of the control framework is modular. Two different control frameworks were proposed...
Background: Reports indicate that percutaneous posterior tibial nerve stimulation improve pain symptoms of the patients with chronic pelvic pain. Objective: The aim of this study is to assess the efficacy of bilateral transcutaneous posterior tibial nerve stimulation (PTNS) for functional anorectal pain. Design: Prospective study. Single-group pilot study. Patients: 10 patients with functional anorectal...
Objective: To determine the relative benefit of electrical stimulation (ES) and voluntary cycling exercise for persons with moderate to severe multiple sclerosis (MS). Design: Case series. Setting: Laboratory/Disabled gymnasium. Participants: 5 females with moderate to severe multiple sclerosis who were experienced with neuromuscular electrical stimulation cycling exercise. Interventions: each participant...
We examined the stability of the ankle joint moment (AM) and M-wave amplitude evoked by electrical stimulation of the gastrocnemius and soleus muscle. The use of functional electrical stimulation (FES) is associated with some problems, including the fact that the muscle activity evoked by electrical stimulation decreases with muscle fatigue. Also, when electrical stimulation is delivered via surface...
Human listeners are capable of extracting several information of the speaker such as personality, emotional state, gender, and age using features present in speech signal. The gender classification of a speaker based on his or her speech signal is crucial in telecommunication. This study proposes a gender classification technique using the neural responses of a physiologically-based computational...
FES-rowing has been developed as an alternative ‘hybrid’ exercise modality that has the capacity to increase exercise training intensity, and thus elicit greater cardiorespiratory and health responses. A novel manual controlled sliding stretcher FES rowing system has been recently developed, but it requires the rower with paralyzed lower limbs to maintain prolonged concentration and possess high finger...
Higher-order Spectral (HOS) techniques can be used to detect deviations from linearity, stationarity or Guassianity in the signal. Most of the biomédical signals are non-linear, non-stationary, and non-Gaussian in nature. It is more useful to analyze them with HOS compared to the use of second-order statistics (power spectrum). There are some features in the bispectrum that are capable of differentiating...
Functional Electrical Stimulation (FES) is a technique to artificially stimulate motor nerves in order to restore motor/sensory functions for assistive and therapeutic applications. This preliminary study attempts to detect differences in the perception of transcutaneous FES in upper limbs. Three chronic stroke survivors participated in the study. Multi-field electrodes were used to selectively activate...
Over the last decade we developed methods for the fabrication of laser-structured electrode arrays for neural engineering. For these electrode arrays a metal foil was structured with a 1064 nm Nd:YAG laser in the nanosecond pulse regime and placed within a silicone rubber substrate. Due to process restrictions the individual electrode sites are not in plane with the upper layer of the silicone rubber...
Freezing of gait (FOG) and festination are common symptoms in Parkinson Disease. They affect gait pattern and are associated to fall risks. We aim at early detection of FOG and festination episodes in order to trigger FES assistance. In this paper we present preliminary experimental results of FOG and festination detection including frequency analysis and gait parameters changes. The proposed solution...
This paper presents a study protocol for comparing the effectiveness of two different configurations of multi-pad electrode array (MEA) in functional electrical stimulation (FES)-evoked cycling. In this study protocol, muscular force produced by quadriceps and the duration of achieving muscular fatigue would be compared between two different stimulation configurations of MEA. The first configuration...
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