Study on lower back electrotactile stimulation characteristics for prosthetic sensory feedback

Seps, Monika; Dermitzakis, Konstantinos; Hernandez-Arieta, Alejandro

doi:10.1109/iros.2011.6095110

Cited by 12 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tactile cues can vary in frequency, strength, duration, pattern, and location [ 93 ]. The majority of feedback systems transmit discrete information [ 94 – 96 ] but moving stimuli are also possible [ 97 , 98 ]. Electrotactile [ 94 , 95 , 99 , 100 ] and vibrotactile [ 87 , 101 , 102 ] stimulation have been used to convey information about characteristics of gait and postural control and possible deviations.…”

Section: The Prosthesis/orthosis Usermentioning

confidence: 99%

Control strategies for active lower extremity prosthetics and orthotics: a review

Tucker¹,

Olivier

Pagel³

et al. 2015

J NeuroEngineering Rehabil

824

591

View full text Add to dashboard Cite

Technological advancements have led to the development of numerous wearable robotic devices for the physical assistance and restoration of human locomotion. While many challenges remain with respect to the mechanical design of such devices, it is at least equally challenging and important to develop strategies to control them in concert with the intentions of the user.This work reviews the state-of-the-art techniques for controlling portable active lower limb prosthetic and orthotic (P/O) devices in the context of locomotive activities of daily living (ADL), and considers how these can be interfaced with the user’s sensory-motor control system. This review underscores the practical challenges and opportunities associated with P/O control, which can be used to accelerate future developments in this field. Furthermore, this work provides a classification scheme for the comparison of the various control strategies.As a novel contribution, a general framework for the control of portable gait-assistance devices is proposed. This framework accounts for the physical and informatic interactions between the controller, the user, the environment, and the mechanical device itself. Such a treatment of P/Os – not as independent devices, but as actors within an ecosystem – is suggested to be necessary to structure the next generation of intelligent and multifunctional controllers.Each element of the proposed framework is discussed with respect to the role that it plays in the assistance of locomotion, along with how its states can be sensed as inputs to the controller. The reviewed controllers are shown to fit within different levels of a hierarchical scheme, which loosely resembles the structure and functionality of the nominal human central nervous system (CNS). Active and passive safety mechanisms are considered to be central aspects underlying all of P/O design and control, and are shown to be critical for regulatory approval of such devices for real-world use.The works discussed herein provide evidence that, while we are getting ever closer, significant challenges still exist for the development of controllers for portable powered P/O devices that can seamlessly integrate with the user’s neuromusculoskeletal system and are practical for use in locomotive ADL.

show abstract

Section: The Prosthesis/orthosis Usermentioning

confidence: 99%

Control strategies for active lower extremity prosthetics and orthotics: a review

Tucker¹,

Olivier

Pagel³

et al. 2015

J NeuroEngineering Rehabil

824

591

View full text Add to dashboard Cite

show abstract

“…For the smaller electrodes, stimulation took place on the forearm at weak and strong magnitudes of sensation. The forearm, biceps, and back locations were chosen because they are commonly used stimulation sites in haptic feedback studies (8,10,15,(30)(31)(32)(33).…”

Section: Electrotactile Stimulationmentioning

confidence: 99%

Controlling sensation intensity for electrotactile stimulation in human-machine interfaces

2018

View full text Add to dashboard Cite

A barrier to practical use of electrotactile stimulation for haptic feedback has been large variability in perceived sensation intensity due to changes in the impedance of the electrode-skin interface, such as when electrodes peel or users sweat. Here, we show how to significantly reduce this variability by modulating stimulation parameters in response to measurements of impedance. Our method derives from three contributions. First, we created a model between stimulation parameters and impedance at constant perceived sensation intensity by looking at the peak pulse energy and phase charge. Our model fits experimental data better than previous models (mean R2 > 0.9) and holds over a larger set of conditions (subjects, sessions, magnitudes of sensation, stimulation locations, electrode sizes). Second, we implemented a controller that regulates perceived sensation intensity by using our model to derive a new current amplitude and pulse duration in response to changes in impedance. Our controller accurately predicts subject-chosen stimulation parameters at constant sensation intensity (mean R2 > 0.9). Third, we demonstrated as a proof-of-concept on two subjects with below-elbow amputations—using a prosthesis with electrotactile touch feedback—that our controller can regulate sensation intensity in response to large impedance changes that occur in activities of daily living. These results make electrotactile stimulation for human-machine interfaces more reliable during activities of daily living.

show abstract

“…Electric stimulation has become one of the most important and useful tool in information representation, tactile augmentation, sense substitution, virtual reality and so on (Seps et al, 2011;Altinsoy and Merchel, 2012;Isakovi c et al, 2016). With the advance of technology, these devices are becoming more miniature, portable, and comfortable.…”

Section: Introductionmentioning

confidence: 99%

An investigation of stimuli-current thresholds on the non-steady contact condition

Chen

Shuai

Zhu

et al. 2019

View full text Add to dashboard Cite

Purpose This paper aims to investigate the perception threshold (PT) of electrotactile stimulation under non-steady contact condition (NSCC) which is rarely considered in previous reports mainly because of the difficulty with experimental control. Three factors of NSCC are involved, including the current alternating frequency, the tapping interval of stimulation and the stimulating area of skin. The study is aimed at providing the basic PT data for design and application of wearable and portable electrotactile device. Design/methodology/approach The up-down method was selected to assess PT, and 72 experimental scenarios were constructed. During the study, we developed an experimental platform with the function of data record and programmable current stimulation. With psychophysical experiment, more than 10,000 data were collected. Furthermore, statics analysis and ANOVA test were opted for exploring the main factor influencing PT. Findings NSCC has different PTs on each body location, and PT has a positive correlation with frequency. In general, PT in NSCC is significantly lower than that in SCC. In some cases, it can be lower by more than 60 per cent. In addition, women have a lower PT than men across all age groups, and the younger is generally more sensitive than the older in electro-sensation. Research limitations/implications Limited factors of NSCC were considered in this study. Contact time and break interval should be investigated in the future work. Practical implications The paper includes implications for the development of smart electrotactile device. Originality/value This paper fulfills a challenge in assessing the PT under NSCC.

show abstract

Study on lower back electrotactile stimulation characteristics for prosthetic sensory feedback

Cited by 12 publications

References 11 publications

Control strategies for active lower extremity prosthetics and orthotics: a review

Control strategies for active lower extremity prosthetics and orthotics: a review

Controlling sensation intensity for electrotactile stimulation in human-machine interfaces

An investigation of stimuli-current thresholds on the non-steady contact condition

Contact Info

Product

Resources

About