scholarly journals Feedback control of the forearm movement of tetraplegic patient based on microsoft kinect and multi-pad electrodes

2013 ◽  
Vol 21 (1) ◽  
pp. 7-11 ◽  
Author(s):  
Matija Strbac ◽  
Nebojsa Malesevic ◽  
Radoje Cobeljic ◽  
Laszlo Schwirtlich
Keyword(s):  
Sensory Feedback ◽  
Closed Loop ◽  
Microsoft Kinect ◽  
Hand Position ◽  
Closed Loop Control ◽  
The Novel ◽  
Upper Arm ◽  
Loop Control ◽  
Novel Algorithm ◽  
Stimulation Of

We present a novel system for control of elbow movements by electrical stimulation of the biceps and triceps in tetraplegic patients. The operation of the system uses the novel algorithm and applies closed loop control. Movement of the arm is generated via multi-pad electrodes developed by Tecnalia Serbia, Ltd. by the stimulator that allows asynchronous activation of individual pads. The electrodes are positioned over the innervation of the biceps and triceps muscles on the upper arm. This layout allows distributed activation; thereby, selective and low fatiguing activation of paralyzed muscles. The sensory feedback comes from the image acquired by the Microsoft Kinect system and the depth stream analysis is performed in real time by the computer running in the MatLab environment. The image based feedback allows control of the hand position at the target by cocontraction of the antagonists. The control adjusts the stimulation intensity and results with the tracking of the desired movement. The algorithm was proven to operate efficiently in a tetraplegic patient.

Some Observations of Articulation during Labial Sensory Deprivation

1972 ◽  
Vol 15 (3) ◽  
pp. 529-542 ◽  
Author(s):  
Anne H. B. Putnam ◽  
Robert L. Ringel
Keyword(s):  
Sensory Feedback ◽  
Closed Loop ◽  
Sensory Deprivation ◽  
Measurement Techniques ◽  
Closed Loop Control ◽  
Loop Control ◽  
Monosyllabic Words ◽  
Lip Movement ◽  
Quantitative Analyses ◽  
Nerve Block Anesthesia

Photographic measurement techniques were used to study labial movement under normal speaking conditions and when sensory feedback from the lips was reduced by trigeminal nerve-block anesthesia. Lip activity was photographed as a subject spoke monosyllabic words initiated by /p/, /b/, or /m/. Qualitative observations were made of general articulatory characteristics, and frame-by-frame quantitative analyses were performed on the release phase of each bilabial consonant. The labial sensory deprivation condition resulted primarily in phonetic articulatory changes due to an overall reduction in the normal rate, accuracy, and extent of lip movement. The data were discussed in terms of the differential effects of reduced labial sensory feedback on the bilabial consonants and interpreted with respect to open- and closed-loop control of articulation.

A novel hybrid closed-loop control approach for dexterous prosthetic hand based on myoelectric control and electrical stimulation

2018 ◽  
Vol 45 (4) ◽  
pp. 526-538 ◽  
Author(s):  
Li Jiang ◽  
Qi Huang ◽  
Dapeng Yang ◽  
Shaowei Fan ◽  
Hong Liu
Keyword(s):  
Motion Control ◽  
Sensory Feedback ◽  
Closed Loop ◽  
Control Method ◽  
Human Motion ◽  
Prosthetic Hand ◽  
Closed Loop Control ◽  
Content Type ◽  
Loop Control ◽  
High Level

Purpose The purpose of this study is to present a novel hybrid closed-loop control method together with its performance validation for the dexterous prosthetic hand. Design/methodology/approach The hybrid closed-loop control is composed of a high-level closed-loop control with the user in the closed loop and a low-level closed-loop control for the direct robot motion control. The authors construct the high-level control loop by using electromyography (EMG)-based human motion intent decoding and electrical stimulation (ES)-based sensory feedback. The human motion intent is decoded by a finite state machine, which can achieve both the patterned motion control and the proportional force control. The sensory feedback is in the form of transcutaneous electrical nerve stimulation (TENS) with spatial-frequency modulation. To suppress the TENS interfering noise, the authors propose biphasic TENS to concentrate the stimulation current and the variable step-size least mean square adaptive filter to cancel the noise. Eight subjects participated in the validation experiments, including pattern selection and egg grasping tasks, to investigate the feasibility of the hybrid closed-loop control in clinical use. Findings The proposed noise cancellation method largely reduces the ES noise artifacts in the EMG electrodes by 18.5 dB on average. Compared with the open-loop control, the proposed hybrid closed-loop control method significantly improves both the pattern selection efficiency and the egg grasping success rate, both in blind operating scenarios (improved by 1.86 s, p < 0.001, and 63.7 per cent, p < 0.001) or in common operating scenarios (improved by 0.49 s, p = 0.008, and 41.3 per cent, p < 0.001). Practical implications The proposed hybrid closed-loop control method can be implemented on a prosthetic hand to improve the operation efficiency and accuracy for fragile objects such as eggs. Originality/value The primary contribution is the proposal of the hybrid closed-loop control, the spatial-frequency modulation method for the sensory feedback and the noise cancellation method for the integrating of the myoelectric control and the ES-based sensory feedback.

scholarly journals A Biological Micro Actuator: Graded and Closed-Loop Control of Insect Leg Motion by Electrical Stimulation of Muscles

PLoS ONE ◽  
2014 ◽  
Vol 9 (8) ◽  
pp. e105389 ◽  
Author(s):  
Feng Cao ◽  
Chao Zhang ◽  
Tat Thang Vo Doan ◽  
Yao Li ◽  
Daniyal Haider Sangi ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Loop Control ◽  
Micro Actuator ◽  
Leg Motion ◽  
Stimulation Of

Optimized Pulse Modulation: A Novel Idea of a Digital Control Method for On/Off Valves

2011 ◽  
Author(s):  
Ingo Schepers ◽  
Daniel Weiler ◽  
Juergen Weber
Keyword(s):  
Digital Control ◽  
Closed Loop ◽  
Control Method ◽  
Closed Loop Control ◽  
The Novel ◽  
Control Methods ◽  
Pulse Control ◽  
Pulse Modulation ◽  
Loop Control ◽  
The Common

This article describes how on/off valves can be used in the closed loop control. After studying different industrial hydraulic applications typical requirements will be compiled. From these requirements a basic on/off valve architecture will be derived. In this article the number of parallel connected on/off valves per control edge is limited to one valve. So the typical digital hydraulics with a high number of parallel connected valves is not considered. The on/off valves could not be controlled like normal directional valves. To control on/off valves digital control methods are common to use. The digital control methods are not optimized for the hydraulic on/off valves, because the origins of the digital control methods will be found in the electrical engineering. The novel idea for the digital control methods is the optimized pulse control which eliminates the disadvantages of the common digital control methods. How the optimized pulse control works is described in this article.

Hybrid FES orthosis incorporating closed loop control and sensory feedback

1988 ◽  
Vol 10 (2) ◽  
pp. 189-195 ◽  
Author(s):  
B.J. Andrews ◽  
R.H. Baxendale ◽  
R. Barnett ◽  
G.F. Phillips ◽  
T. Yamazaki ◽  
...  
Keyword(s):  
Sensory Feedback ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Loop Control

Closed-Loop Control of Force During Electrical Stimulation of Muscle

1980 ◽  
Vol BME-27 (6) ◽  
pp. 306-312 ◽  
Author(s):  
Patrick E. Crago ◽  
J. Thomas Mortimer ◽  
P. Hunter Peckham
Keyword(s):  
Electrical Stimulation ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Loop Control ◽  
Stimulation Of

Closed-loop control of the heart rate by electrical stimulation of the vagus nerve

2006 ◽  
Vol 44 (3) ◽  
pp. 161-169 ◽  
Author(s):  
Marco Tosato ◽  
Ken Yoshida ◽  
Egon Toft ◽  
Vitas Nekrasas ◽  
Johannes J. Struijk
Keyword(s):  
Heart Rate ◽  
Electrical Stimulation ◽  
Vagus Nerve ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Loop Control ◽  
Stimulation Of

The Impact of Visual Feedback Type on the Mastery of Visuo-Motor Transformations

2012 ◽  
Vol 220 (1) ◽  
pp. 3-9 ◽  
Author(s):  
Sandra Sülzenbrück
Keyword(s):  
Empirical Research ◽  
Visual Feedback ◽  
Closed Loop ◽  
Motor Planning ◽  
Visual Input ◽  
Closed Loop Control ◽  
Loop Control ◽  
Feedback Type ◽  
Effective Use ◽  
The Impact

For the effective use of modern tools, the inherent visuo-motor transformation needs to be mastered. The successful adjustment to and learning of these transformations crucially depends on practice conditions, particularly on the type of visual feedback during practice. Here, a review about empirical research exploring the influence of continuous and terminal visual feedback during practice on the mastery of visuo-motor transformations is provided. Two studies investigating the impact of the type of visual feedback on either direction-dependent visuo-motor gains or the complex visuo-motor transformation of a virtual two-sided lever are presented in more detail. The findings of these studies indicate that the continuous availability of visual feedback supports performance when closed-loop control is possible, but impairs performance when visual input is no longer available. Different approaches to explain these performance differences due to the type of visual feedback during practice are considered. For example, these differences could reflect a process of re-optimization of motor planning in a novel environment or represent effects of the specificity of practice. Furthermore, differences in the allocation of attention during movements with terminal and continuous visual feedback could account for the observed differences.

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