Enhanced visual feedback for slip prevention with a prosthetic hand

2012 ◽  
Vol 36 (4) ◽  
pp. 423-429 ◽  
Author(s):  
Erik D Engeberg ◽  
Sanford Meek
Keyword(s):  
Visual Feedback ◽  
Upper Limb ◽  
Grip Force ◽  
Force Feedback ◽  
Sliding Mode ◽  
Controlled Trial ◽  
Prosthetic Hand ◽  
Success Rates ◽  
Precise Control ◽  
Visual Force Feedback

Background: Upper limb amputees have no direct sense of the grip force applied by a prosthetic hand; thus, precise control of the applied grip force is difficult for amputees. Since there is little object deformation when rigid objects are grasped, it is difficult for amputees to visually gauge the applied grip force in this situation. Objectives: To determine if the applied grip force from a prosthetic hand can be visually displayed and used to more efficaciously grasp objects. Study Design: Experimental controlled trial. Methods: Force feedback is used in the control algorithm for the prosthetic hand and supplied visually to the user through a bicolor LED experimentally mounted to the thumb. Several experiments are performed by able-bodied test subjects to rate the usefulness of the additional visual feedback when manipulating a clearly visible, brittle object that can break if grasped too firmly. A hybrid force-velocity sliding mode controller is used with and without additional visual force feedback supplied to the operators. Results: Subjective evaluations and success rates from the test subjects indicate a statistically significant reduction in breaking the grasped object when using the prosthesis with the extra visual feedback. Conclusions: The additional visual force feedback can effectively facilitate the manipulation of brittle objects. Clinical relevance The novel approach of this research is the implementation of a noninvasive, effective and economic technique to visually indicate the grip force applied by a prosthetic hand to upper limb amputees. This technique provides a statistically significant improvement when handling brittle objects.

Results of an Internet survey of myoelectric prosthetic hand users

2007 ◽  
Vol 31 (4) ◽  
pp. 362-370 ◽  
Author(s):  
Christian Pylatiuk ◽  
Stefan Schulz ◽  
Leonhard Döderlein
Keyword(s):  
Upper Limb ◽  
Force Feedback ◽  
Index Finger ◽  
Feedback System ◽  
Internet Survey ◽  
Personal Hygiene ◽  
Prosthetic Hand ◽  
Hand Prosthesis ◽  
Myoelectric Prostheses ◽  
High Level

The results of a survey of 54 persons with upper limb amputations who anonymously completed a questionnaire on an Internet homepage are presented. The survey ran for four years and the participants were divided into groups of females, males, and children. It was found that the most individuals employ their myoelectric hand prosthesis for 8 hours or more. However, the survey also revealed a high level of dissatisfaction with the weight and the grasping speed of the devices. Activities for which prostheses should be useful were stated to include handicrafts, personal hygiene, using cutlery, operation of electronic and domestic devices, and dressing/undressing. Moreover, additional functions, e.g., a force feedback system, independent movements of the thumb, the index finger, and the wrist, and a better glove material are priorities that were identified by the users as being important improvements the users would like to see in myoelectric prostheses.

scholarly journals Proprioceptive Training with Visual Feedback Improves Upper Limb Function in Stroke Patients: A Pilot Study

2022 ◽  
Vol 2022 ◽  
pp. 1-10
Author(s):  
Jieying He ◽  
Chong Li ◽  
Jiali Lin ◽  
Beibei Shu ◽  
Bin Ye ◽  
...  
Keyword(s):  
Upper Extremity ◽  
Motor Function ◽  
Visual Feedback ◽  
Upper Limb ◽  
Negative Impact ◽  
Controlled Trial ◽  
Sensory Stimulation ◽  
Control Group ◽  
Clinical Trial Registry ◽  
Proprioceptive Training

Proprioceptive deficit is one of the common sensory impairments following stroke and has a negative impact on motor performance. However, evidence-based training procedures and cost-efficient training setups for patients with poststroke are still limited. We compared the effects of proprioceptive training versus nonspecific sensory stimulation on upper limb proprioception and motor function rehabilitation. In this multicenter, single-blind, randomized controlled trial, 40 participants with poststroke hemiparesis were enrolled from 3 hospitals in China. Participants were assigned randomly to receive proprioceptive training involving passive and active movements with visual feedback (proprioceptive training group [PG]; n = 20 ) or nonspecific sensory stimulation (control group [CG]; n = 20 ) 20 times in four weeks. Each session lasted 30 minutes. A clinical assessor blinded to group assignment evaluated patients before and after the intervention. The primary outcome was the change in the motor subscale of the Fugl-Meyer assessment for upper extremity (FMA-UE-M). Secondary outcomes were changes in box and block test (BBT), thumb localization test (TLT), the sensory subscale of the Fugl-Meyer assessment for upper extremity (FMA-UE-S), and Barthel Index (BI). The results showed that the mean change scores of FMA-UE were significantly greater in the PG than in the CG ( p = 0.010 for FMA-UE-M, p = 0.033 for FMA-UE-S). The PG group was improved significantly in TLT ( p = 0.010 ) and BBT ( p = 0.027 ), while there was no significant improvement in TLT ( p = 0.083 ) and BBT ( p = 0.107 ) for the CG group. The results showed that proprioceptive training was effective in improving proprioception and motor function of the upper extremity in patients with poststroke. This trial is registered in the Chinese Clinical Trial Registry (ChiCTR2000037808).

scholarly journals The Effect of Dissociation between Proprioception and Vision on Perception and Grip Force Control in a Stiffness Judgment Task

2018 ◽  
Author(s):  
Stephanie Hu ◽  
Raz Leib ◽  
Ilana Nisky
Keyword(s):  
Visual Feedback ◽  
Grip Force ◽  
Force Feedback ◽  
Judgment Task ◽  
Hand Position ◽  
Sensorimotor System ◽  
Mixed Effect ◽  
Sensory Modalities ◽  
Teleoperation Systems ◽  
Visual Delay

AbstractOur sensorimotor system estimates stiffness to form stiffness perception, such as for choosing a ripe fruit, and to generate actions, such as to adjust grip force to avoid slippage of a scalpel during surgery. We examined how temporal manipulation of the haptic and visual feedback affect stiffness perception and grip force adjustment during a stiffness discrimination task. We used delayed force feedback and delayed visual feedback to break the natural relations between these modalities when participants tried to choose the harder spring between pairs of springs. We found that visual delay caused participants to slightly overestimate stiffness while force feedback delay caused a mixed effect on perception; for some it caused underestimation and for some overestimation of stiffness. Interestingly and in contrast to previous findings without vision, we found that participants increased the magnitude of their applied grip force for all conditions. We propose a model that suggests that this increase was a result of coupling the grip force adjustment to their proprioceptive hand position, which was the only modality which we could not delay. Our findings shed light on how the sensorimotor system combines information from different sensory modalities for perception and action. These results are important for the design of improved teleoperation systems that suffer from unavoidable delays.

scholarly journals Functional benefit of an adaptive myoelectric prosthetic hand compared to a conventional myoelectric hand

1992 ◽  
Vol 16 (1) ◽  
pp. 32-37 ◽  
Author(s):  
K. Bergman ◽  
L. Örnholmer ◽  
K. Zackrisson ◽  
M. Thyberg
Keyword(s):  
Upper Limb ◽  
Grip Force ◽  
Limb Amputation ◽  
Prosthetic Hand ◽  
Prosthetic Rehabilitation ◽  
Myoelectric Prostheses ◽  
Upper Limb Amputation ◽  
Functional Benefit ◽  
Function Test

Eight patients with a traumatic unilateral upper limb amputation, who used conventional myoelectric prostheses, were also fitted with a commercially available myoelectric prosthetic hand with an adaptive grip, in order to compare the functional benefit of the two types of prostheses. Comparisons were made regarding width of grip, force of grip, scores in a standardised grip function test and prosthesis preference. The conventional prosthesis showed significantly better results regarding these parameters. The adaptive hand does not appear to be fully developed for practical use in prosthetic rehabilitation.

scholarly journals Assessment of virtual teacher feedback for the recovery of the upper limb after a stroke. Study protocol for a randomized controlled trial.

2016 ◽  
Vol 20 (3) ◽  
pp. 13-20 ◽  
Author(s):  
Pawel Kiper ◽  
Carla Zucconi ◽  
Michela Agostini ◽  
Alfonc Baba ◽  
Francesco Dipalma ◽  
...  
Keyword(s):  
Randomized Controlled Trial ◽  
Virtual Reality ◽  
Motor Function ◽  
Visual Feedback ◽  
Study Protocol ◽  
Upper Limb ◽  
Controlled Trial ◽  
Teacher Feedback ◽  
Randomized Controlled ◽  
Stroke Study

Enhanced feedback provided by virtual reality has been shown to promote motor learning both in healthy subjects and patients with motor impairments following lesions of the central nervous system. The aim of this study is to evaluate the effect of displaying a virtual teacher as visual feedback to promote the recovery of upper limb motor function after a stroke. The protocol reports the design of a single blind randomized controlled trial (RCT), blinded to outcome assessment. Two different treatments based on virtual reality will be compared: in the “Teacher” group, the patients receive treatment with continuous displaying of a virtual teacher, while in the “No-Teacher” group, the same exercises will be proposed without visualization of a virtual teacher. The Fugl-Meyer upper extremity scale will be considered as the primary outcome, while the Functional Independence Measure scale, Reaching Performance Scale and Modified Ashworth Scale will be considered as secondary outcomes. Moreover, kinematic parameters such as mean duration (seconds), mean linear velocity (cm/s) and smoothness (i.e. number of sub-movements) will be registered when performing standardised tasks. All tests will be performed before and after treatments. Both treatments will last four weeks with a daily session lasting one hour, five days a week (20 overall sessions). This study is designed to systematically assess the influence of using enhanced visual feedback for the recovery of upper limb motor function after a stroke. These findings will help to determine whether the use of a virtual teacher as enhanced visual feedback is effective for promoting better recovery of upper limb motor function over four weeks of post-stroke treatment. Current Controlled Trials registration number: NCT02234531 (registered on 29 August 2014, ClinicalTrials. gov) Kiper P., Zucconi C., Agostini M., Baba A., Dipalma F., Berlingieri C., Longhi C., Tonin P., Turolla A. Assessment of virtual teacher feedback for the recovery of the upper limb after a stroke. Study protocol for a randomized controlled trial. Med Rehabil 2016; 20(3): 13-20. DOI: 10.5604/01.3001.0009.5010

Novel Adaptive Reaching Law for Sliding Mode Control of an Upper Limb Exoskeleton Robot*

2020 ◽  
Author(s):  
Brahim Brahmi ◽  
Khaled El-Monajjed ◽  
Mohammad Habibur Rahman ◽  
Tanvir Ahmed ◽  
Claude El-Bayeh ◽  
...  
Keyword(s):  
Sliding Mode Control ◽  
Upper Limb ◽  
Sliding Mode ◽  
Reaching Law ◽  
Mode Control ◽  
Upper Limb Exoskeleton ◽  
Exoskeleton Robot

scholarly journals A Prospective Multicenter Study of “Inside Stents” for Biliary Stricture: Multicenter Evolving Inside Stent Registry (MEISteR)

2021 ◽  
Vol 10 (13) ◽  
pp. 2936
Author(s):  
Hirofumi Kogure ◽  
Hironari Kato ◽  
Kazumichi Kawakubo ◽  
Hirotoshi Ishiwatari ◽  
Akio Katanuma ◽  
...  
Keyword(s):  
Multicenter Study ◽  
Stent Placement ◽  
Controlled Trial ◽  
Adverse Event Rate ◽  
Success Rates ◽  
Technical Success ◽  
Biliary Strictures ◽  
Prospective Multicenter Study ◽  
Stent Occlusion ◽  
Benign Biliary Strictures

Background: Endoscopic biliary stent placement is the standard of care for biliary strictures, but stents across the papilla are prone to duodenobiliary reflux, which can cause stent occlusion. Preliminary studies of “inside stents” placed above the papilla showed encouraging outcomes, but prospective data with a large cohort were not reported. Methods: This was a prospective multicenter registry of commercially available inside stents for benign and malignant biliary strictures. Primary endpoint was recurrent biliary obstruction (RBO). Secondary endpoints were technical success of stent placement and removal, adverse events, and stricture resolution. Results: A total of 209 inside stents were placed in 132 (51 benign and 81 malignant) cases with biliary strictures in 10 Japanese centers. During the follow-up period of 8.4 months, RBO was observed in 19% of benign strictures. The RBO rate was 49% in malignant strictures, with the median time to RBO of 4.7 months. Technical success rates of stent placement and removal were both 100%. The adverse event rate was 8%. Conclusion: This prospective multicenter study demonstrated that inside stents above the papilla were feasible in malignant and benign biliary strictures, but a randomized controlled trial is warranted to confirm its superiority to conventional stents across the papilla.

scholarly journals Recent Advances in Myoelectric Control for Finger Prostheses for Multiple Finger Loss

2021 ◽  
Vol 11 (10) ◽  
pp. 4464
Author(s):  
Viritpon Srimaneepong ◽  
Artak Heboyan ◽  
Azeem Ul Yaqin Syed ◽  
Hai Anh Trinh ◽  
Pokpong Amornvit ◽  
...  
Keyword(s):  
Web Of Science ◽  
Myoelectric Control ◽  
Original Research ◽  
Prosthetic Hand ◽  
Precise Control ◽  
Prosthetic Hands ◽  
Prosthesis Retention ◽  
Finger Prosthesis ◽  
Artificial Hand

The loss of one or multiple fingers can lead to psychological problems as well as functional impairment. Various options exist for replacement and restoration after hand or finger loss. Prosthetic hand or finger prostheses improve esthetic outcomes and the quality of life for patients. Myoelectrically controlled hand prostheses have been used to attempt to produce different movements. The available articles (original research articles and review articles) on myoelectrically controlled finger/hand prostheses from January 1922 to February 2021 in English were reviewed using MEDLINE/PubMed, Web of Science, and ScienceDirect resources. The articles were searched using the keywords “finger/hand loss”, “finger prosthesis”, “myoelectric control”, and “prostheses” and relevant articles were selected. Myoelectric or electromyography (EMG) signals are read by myoelectrodes and the signals are amplified, from which the muscle’s naturally generated electricity can be measured. The control of the myoelectric (prosthetic) hands or fingers is important for artificial hand or finger movement; however, the precise control of prosthetic hands or fingers remains a problem. Rehabilitation after multiple finger loss is challenging. Implants in finger prostheses after multiple finger loss offer better finger prosthesis retention. This article presents an overview of myoelectric control regarding finger prosthesis for patients with finger implants following multiple finger loss.

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