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https://www.readbyqxmd.com/read/28742043/mixed-modality-stimulation-to-evoke-two-modalities-simultaneously-in-one-channel-for-electrocutaneous-sensory-feedback
#1
Kyunghwan Choi, Pyungkang Kim, Kyung-Soo Kim, Soohyun Kim
One of the long-standing challenges in upper limb prosthetics is restoring the sensory feedback that is missing due to amputation. Two approaches have previously been presented to provide various types of sensory information to users, namely, multi-modality sensory feedback and using an array of singlemodality stimulators. However, the feedback systems used in these approaches were too bulky to be embedded in prosthesis sockets. In this paper, we propose an electrocutaneous sensory feedback method that is capable of conveying two modalities simultaneously with only one electrode...
July 24, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28741593/electro-cutaneous-stimulation-on-the-palm-elicits-referred-sensations-on-intact-but-not-on-amputated-digits
#2
Marco D'Alonzo, Leonard Frederik Engels, Marco Controzzi, Christian Cipriani
Objective Grasping and manipulation control critically depends on tactile feedback. Without this feedback, the ability for fine control of a prosthesis is limited in upper limb amputees. Early studies have shown that non-invasive electro-cutaneous stimulation (ES) can induce referred sensations that are spread to a wider and/or more distant area, with respect to the electrodes. Building on this, we sought to exploit this effect to provide somatotopically matched sensory feedback to people with partial hand (digital) amputations...
July 25, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28736682/standardized-approach-to-quantitatively-measure-residual-limb-skin-health-in-individuals-with-lower-limb-amputation
#3
Cameron L Rink, Matthew M Wernke, Heather M Powell, Mark Tornero, Surya C Gnyawali, Ryan M Schroeder, Jayne Y Kim, Jeffrey A Denune, Alexander W Albury, Gayle M Gordillo, James M Colvin, Chandan K Sen
Objective: (1) Develop a standardized approach to quantitatively measure residual limb skin health. (2) Report reference residual limb skin health values in people with transtibial and transfemoral amputation. Approach: Residual limb health outcomes in individuals with transtibial (n = 5) and transfemoral (n = 5) amputation were compared to able-limb controls (n = 4) using noninvasive imaging (hyperspectral imaging and laser speckle flowmetry) and probe-based approaches (laser doppler flowmetry, transcutaneous oxygen, transepidermal water loss, surface electrical capacitance)...
July 1, 2017: Advances in Wound Care
https://www.readbyqxmd.com/read/28726572/successful-forearm-prosthesis-fitting-in-a-patient-with-epidermolysis-bullosa-dystrophica-case-report
#4
Carl Verduyn, Marie-Anne Morren, Marguerite Stas, Friedl Sinnaeve, Katarina Segers, Carlotte Kiekens
BACKGROUND: Epidermolysis bullosa dystrophica is a rare dermatological disease characterized by extreme skin fragility and elevated risk of developing a squamous cell carcinoma. In some cases, amputation of a limb is necessary. Case description and methods: A 37-year-old man with recessive, severe generalized epidermolysis bullosa dystrophica developed a squamous cell carcinoma on the right forearm requiring a below-elbow amputation. Preoperative advice concerning indication and level of amputation was given...
July 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28704745/giant-iatrogenic-pseudoaneurysm-of-the-brachial-artery-a-case-report
#5
Tulio Leite, Márcio Pires, Lucas Pires, Carlos Chagas, Antonio Claudio Oliveira
INTRODUCTION: Pseudoaneurysms are a pulsatile hematoma caused by hemorrhage on soft tissues. It is an uncommon condition with many different etiologies. We report a case of a giant pseudoaneurysm caused by iatrogenic injury on the brachial artery. PRESENTATION OF CASE: A 42 year-old male was submitted to our Vascular Surgery service with an enlargement of the right upper limb and a history of myocardial infarction. 60days before the patient reached our service, he was submitted to a cardiac catheterization performed by another medical team, since the catheter was placed on the right brachial artery near the cubital fossa, we suspected an iatrogenic pseudoaneurysm, which was confirmed by his clinical history and physical exam...
July 3, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/28704685/dynamic-balance-changes-within-three-weeks-of-fitting-a-new-prosthetic-foot-component
#6
Jenny A Kent, Nicholas Stergiou, Shane R Wurdeman
Balance during walking is of high importance to prosthesis users and may affect walking during baseline observation and evaluation. The aim of this study was to determine whether changes in walking balance occurred during an adaptation period following the fitting of a new prosthetic component. Margin of stability in the medial-lateral direction (MOSML) and an anterior instability margin (AIM) were used to quantify the dynamic balance of 21 unilateral transtibial amputees during overground walking. Participants trialled two prosthetic feet presenting contrasting movement/balance constraints; a Higher Activity foot similar to that of their own prosthesis, and a Lower Activity foot...
July 5, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28702398/late-screw-perforation-of-external-iliac-artery-following-acetabular-revision-a-simple-solution-for-a-rare-complication
#7
André Sá Rodrigues, Joana Freitas, Isabel Pinto, Sérgio Sampaio, Rui Pinto
Vascular lesions, although quite rare, are one of the most devastating complications in the context of a hip prosthesis. Therefore, the correct diagnosis is crucial to prevent irreversible damage to the patient. The authors present the case of a 70-year-old Caucasian woman with an ischemic lower limb as consequence of a late perforation of external iliac artery due to an acetabular screw. The issue was resolved by simply cutting part of the screw, avoiding other surgical options that would be much more aggressive for the patient...
May 2017: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/28694439/reachability-and-the-sense-of-embodiment-in-amputees-using-prostheses
#8
Adrienne Gouzien, Fréderique de Vignemont, Amélie Touillet, Noël Martinet, Jozina De Graaf, Nathanaël Jarrassé, Agnès Roby-Brami
Amputated patients are hardly satisfied with upper limb prostheses, and tend to favour the use of their contralateral arm to partially compensate their disability. This may seem surprising in light of recent evidences that external objects (rubber hand or tool) can easily be embodied, namely incorporated in the body representation. We investigated both implicit body representations (by evaluating the peripersonal space using a reachability judgement task) and the quality of bodily integration of the patient's prosthesis (assessed via questionnaires)...
July 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28691694/context-dependent-adaptation-improves-robustness-of-myoelectric-control-for-upper-limb-prostheses
#9
Gauravkumar K Patel, Janne Mathias Hahne, Claudio Castellini, Dario Farina, Strahinja Dosen
OBJECTIVE: Dexterous upper-limb prostheses are available today to restore grasping, but an effective and reliable feed-forward control is still missing. The aim of this work was to improve the robustness and reliability of myoelectric control by using context information from sensors embedded within the prosthesis. APPROACH: We developed a context-driven myoelectric control scheme (cxMYO) that incorporates the inference of context information from proprioception (inertial measurement unit) and exteroception (force and grip aperture) sensors to modulate the outputs of myoelectric control...
July 10, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28684214/skill-assessment-in-upper-limb-myoelectric-prosthesis-users-validation-of-a-clinically-feasible-method-for-characterising-upper-limb-temporal-and-amplitude-variability-during-the-performance-of-functional-tasks
#10
Sibylle B Thies, Laurence Pj Kenney, Mohammad Sobuh, Adam Galpin, Peter Kyberd, Rebecca Stine, Matthew J Major
Upper limb myoelectric prostheses remain challenging to use and are often abandoned. A proficient user must be able to plan/execute arm movements while activating the residual muscle(s), accounting for delays and unpredictability in prosthesis response. There is no validated, low cost measure of skill in performing such actions. Trial-trial variability of joint angle trajectories measured during functional task performance, linearly normalised by time, shows promise. However, linear normalisation of time introduces errors, and expensive camera systems are required for joint angle measurements...
July 3, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28678699/turn-intent-detection-for-control-of-a-lower-limb-prosthesis
#11
Corey Pew, Glenn Klute
OBJECTIVE: An adaptable lower limb prosthesis with variable stiffness in the transverse plane requires a control method to effect changes in real time during amputee turning. This study aimed to identify classification algorithms that can accurately predict turning using inertial measurement unit (IMU) signals from the shank with adequate time to enact a change in stiffness during the swing phase of gait when the prosthesis is unloaded. METHODS: To identify if a turning step is imminent, classification models were developed around activities of daily living including 90? spin turns, 90? step turns, 180? turns, and straight walking using simulated IMU data from the prosthesis shank...
June 28, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28676749/preliminary-evidence-for-training-induced-changes-of-morphology-and-phantom-limb-pain
#12
Sandra Preißler, Désirée Thielemann, Caroline Dietrich, Gunther O Hofmann, Wolfgang H R Miltner, Thomas Weiss
The aim of this study was to investigate whether a special prosthetic training in phantom limb pain patients aimed at increasing the functional use of the prosthesis leads to neural morphological plasticity of brain structures and a reduction in phantom limb pain. For chronic pain disorders, it was shown that morphological alterations due to pain might become at least partially reversed by pain therapies. Phantom limb pain is a chronic pain disorder that is frequently followed by neural plasticity of anatomical brain structures...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28675376/model-based-bayesian-signal-extraction-algorithm-for-peripheral-nerves
#13
Thomas Eggers, Yazan M Dweiri, Grant McCallum, Dominique M Durand
Multi-channel cuff electrodes have recently been investigated for extracting fascicular-level motor commands from mixed neural recordings. Such signals could provide volitional, intuitive control over a robotic prosthesis for amputee patients. Recent work has demonstrated success in extracting these signals in acute and chronic preparations using spatial filtering techniques. These extracted signals, however, had low signal-to-noise ratios and thus limited their utility to binary classification. In this work a new algorithm is proposed which combines previous source localization approaches to create a model based method which operates in real time...
July 4, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28650804/limb-position-tolerant-pattern-recognition-for-myoelectric-prosthesis-control-with-adaptive-sparse-representations-from-extreme-learning
#14
Joseph L Betthauser, Christopher L Hunt, Luke E Osborn, Matthew R Masters, Gyorgy Levay, Rahul Reddy Kaliki, Nitish V Thakor
Myoelectric signals can be used to predict the intended movements of an amputee for prosthesis control. However, untrained effects like limb position changes influence myoelectric signal characteristics, hindering the ability of pattern recognition algorithms to discriminate among motion classes. Despite frequent and long training sessions, these deleterious conditional influences may result in poor performance and device abandonment. GOAL: We present a robust sparsity-based adaptive classification method that is significantly less sensitive to signal deviations resulting from untrained conditions...
June 23, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28650213/visualisation-of-upper-limb-activity-using-spirals-a-new-approach-to-the-assessment-of-daily-prosthesis-usage
#15
Alix Chadwell, Laurence Kenney, Malcolm Granat, Sibylle Thies, John S Head, Adam Galpin
BACKGROUND: Current outcome measures used in upper limb myoelectric prosthesis studies include clinical tests of function and self-report questionnaires on real-world prosthesis use. Research in other cohorts has questioned both the validity of self-report as an activity assessment tool and the relationship between clinical functionality and real-world upper limb activity. Previously,(1) we reported the first results of monitoring upper limb prosthesis use. However, the data visualisation technique used was limited in scope...
June 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28639478/relation-between-capacity-and-performance-in-paediatric-upper-limb-prosthesis-users
#16
Helen Lindner, Ayako Hiyoshi, Liselotte Hermansson
BACKGROUND: The International Classification of functioning, disability and health refers capacity to what an individual can do in a standardised environment and describes performance as what an individual really does and whether the individual encounters any difficulty in the real-life environment. Measures of capacity and performance can help to determine if there is any gap between them that may restrict participation. The aim of this study was to explore the relationship between capacity scores obtained in a standardised clinical setting and proportional ease of performance obtained from a real-life environment...
June 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28637137/development-and-acceptability-testing-of-decision-trees-for-self-management-of-prosthetic-socket-fit-in-adults-with-lower-limb-amputation
#17
Daniel Joseph Lee, Diana A Veneri
PURPOSE: The most common complaint lower limb prosthesis users report is inadequacy of a proper socket fit. Adjustments to the residual limb-socket interface can be made by the prosthesis user without consultation of a clinician in many scenarios through skilled self-management. Decision trees guide prosthesis wearers through the self-management process, empowering them to rectify fit issues, or referring them to a clinician when necessary. This study examines the development and acceptability testing of patient-centered decision trees for lower limb prosthesis users...
February 21, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/28636059/clinical-outcome-and-complications-of-thoracic-and-pelvic-limb-stump-and-socket-prostheses
#18
Andrew Phillips, Elvin Kulendra, Edith Bishop, Michelle Monk, Kevin Parsons, Arthur House
OBJECTIVES: To describe the use, quality of life, compliance, complications, and outcome of animals fitted with stump socket prostheses. METHODS: Medical records of dogs fitted with a stump socket prosthesis were reviewed. Functional outcome, quality of life and complications were retrospectively assessed from an owner questionnaire. RESULTS: Thirteen stump socket prostheses (12 dogs) were fitted for a variety of reasons including trauma, congenital abnormalities, and neoplasia...
June 21, 2017: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/28633788/fluoroscopic-and-gait-analyses-for-the-functional-performance-of%C3%A2-a%C3%A2-custom-made-total-talonavicular-replacement
#19
Claudio Belvedere, Matteo Cadossi, Antonio Mazzotti, Sandro Giannini, Alberto Leardini
The present study evaluated the restoration of joint function in a special clinical case: a professional rock climber who underwent an original total talonavicular replacement with a custom-made prosthesis after a complex articular fracture. Full body gait analysis and 3-dimensional joint kinematics using single-plane fluoroscopy were performed on the same day at the 30-month follow-up examination. Gait analysis was performed using stereophotogrammetric, dynamometric, electromyographic, and baropodometric systems...
July 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28632147/crossover-iliofemoral-bypass-graft-through-tension-free-abdominal-wall-repair-mesh
#20
Mircea Muresan, Ovidiu Jimborean, Gabriela Jimborean, Radu Neagoe, Serban Bancu, Muresan Simona, Cristian Borz
INTRODUCTION: In vascular surgery the crossover iliofemoral bypass grafting is a well-known surgical technique. In general surgery the repair of an abdominal defect using a Polypropylene mesh is also a standard procedure. A particular technique is defined by the performance of these 2 separate procedures inside a single operation in which the crossover arterial graft is directed from the retroperitoneal space toward the contra-lateral femoral bifurcation through a Polypropylene mesh which closes the musculoaponeurotic layers of the abdominal wall...
June 8, 2017: Annali Italiani di Chirurgia
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