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https://www.readbyqxmd.com/read/28814036/prosthetic-design-directives-low-cost-hands-within-reach
#1
G K Jones, A Rosendo, R Stopforth
Although three million people around the world suffer from the lack of one or both upper limbs 80% of this number is located within developing countries. While prosthetic prices soar with technology 3D printing and low cost electronics present a sensible solution for those that cannot afford expensive prosthetics. The electronic and control design of a low-cost prosthetic hand, the Touch Hand II, is discussed. This paper shows that sensorless techniques can be used to reduce design complexities, costs, and provide easier access to the electronics...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813997/dynamic-elasticity-measurement-for-prosthetic-socket-design
#2
Yujin Kim, Junghoon Kim, Hyeryon Son, Youngjin Choi
The paper proposes a novel apparatus to measure the dynamic elasticity of human limb in order to help the design and fabrication of the personalized prosthetic socket. To take measurements of the dynamic elasticity, the desired force generated as an exponential chirp signal in which the frequency increases and amplitude is maintained according to time progress is applied to human limb and then the skin deformation is recorded, ultimately, to obtain the frequency response of its elasticity. It is referred to as a Dynamic Elasticity Measurement Apparatus (DEMA) in the paper...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813978/evaluation-of-3d-printed-anatomically-scalable-transfemoral-prosthetic-knee
#3
Tyagi Ramakrishnan, Millicent Schlafly, Kyle B Reed
This case study compares a transfemoral amputee's gait while using the existing Ossur Total Knee 2000 and our novel 3D printed anatomically scalable transfemoral prosthetic knee. The anatomically scalable transfemoral prosthetic knee is 3D printed out of a carbon-fiber and nylon composite that has a gear-mesh coupling with a hard-stop weight-actuated locking mechanism aided by a cross-linked four-bar spring mechanism. This design can be scaled using anatomical dimensions of a human femur and tibia to have a unique fit for each user...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813846/closed-loop-emg-informed-model-based-analysis-of-human-musculoskeletal-mechanics-on-rough-terrains
#4
C Varotto, Z Sawacha, L Gizzi, D Farina, M Sartori
This work aims at estimating the musculoskeletal forces acting in the human lower extremity during locomotion on rough terrains. We employ computational models of the human neuro-musculoskeletal system that are informed by multi-modal movement data including foot-ground reaction forces, 3D marker trajectories and lower extremity electromyograms (EMG). Data were recorded from one healthy subject locomoting on rough grounds realized using foam rubber blocks of different heights. Blocks arrangement was randomized across all locomotion trials to prevent adaptation to specific ground morphology...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28806424/geometric-evaluation-of-the-effect-of-prosthetic-rehabilitation-on-the-facial-appearance-of-mandibulectomy-patients-a-preliminary-study
#5
Amel M Aswehlee, Mahmoud E Elbashti, Mariko Hattori, Yuka I Sumita, Hisashi Taniguchi
PURPOSE: The purpose of this study was to geometrically evaluate the effect of prosthetic rehabilitation on the facial appearance of mandibulectomy patients. MATERIALS AND METHODS: Facial scans (with and without prostheses) were performed for 16 mandibulectomy patients using a noncontact three-dimensional (3D) digitizer, and 3D images were reconstructed with the corresponding software. The 3D datasets were geometrically evaluated and compared using 3D evaluation software...
August 14, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28771886/alternative-method-to-evaluate-the-adaptation-of-implant-supported-multi-unit-prosthetic-frameworks
#6
Ying Zhou, Yong Li, Xiao Ma, Yiqing Huang, Jiawei Wang
PURPOSE: Various methods to evaluate the adaptation of dental prostheses are available; however, only a few of these methods assess the adaptation of the framework as a whole. This study aimed to propose an alternative method to evaluate the adaptation of implant-supported multi-unit Co-Cr alloy frameworks. MATERIALS AND METHODS: A four-unit framework supported by two implants was designed using a computer. Six dots with a diameter of 0.2 mm were designed randomly using 3Shape software on the abutment surface of the framework for measurement...
August 3, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28764697/femur-first-surgical-technique-a-smart-non-computer-based-procedure-to-achieve-the-combined-anteversion-in-primary-total-hip-arthroplasty
#7
Mattia Loppini, Umile Giuseppe Longo, Emanuele Caldarella, Antonello Della Rocca, Vincenzo Denaro, Guido Grappiolo
BACKGROUND: The relevance of prosthetic component orientation to prevent dislocation and impingement following total hip arthroplasty (THA) has been widely accepted. We investigated the use of a non-computer-based surgery to address the reciprocal orientation of the acetabular and femoral components. METHODS: In the femur first technique, the cup is positioned relative to the stem. When the definitive antetorsion of femoral component is fixed, the cup is positioned in a compliant anteversion to the stem...
August 1, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28740271/fabrication-of-a-3d-printing-definitive-obturator-prosthesis-a-clinical-report
#8
Theodoros Tasopoulos, Georgios Kouveliotis, Grigoris Polyzois, Vasiliki Karathanasi
INTRODUCTION: Digital technologies related to imaging and manufacturing provide the clinician with a wide variety of treatment options. Stereolithography (SLA) offers a simple and predictable way for an accurate reconstruction of congenital or acquired defects. CLINICAL CASE: A 65-years old cancer patient with non- keratinized squamous cell carcinoma of left maxillary sinus came for a prosthetic clinical evaluation. A bilateral maxillectomy was performed and the treatment plan included definite obturator prosthesis for the upper arch...
March 2017: Acta Stomatologica Croatica
https://www.readbyqxmd.com/read/28736923/applications-of-additive-manufacturing-in-dentistry-a-review
#9
REVIEW
Aishwarya Bhargav, Vijayavenkatraman Sanjairaj, Vinicius Rosa, Lu Wen Feng, Jerry Fuh Yh
Additive manufacturing (AM) or 3D printing has been hailed as the third industrial revolution as it has caused a paradigm shift in the way objects have been manufactured. Conventionally, converting a raw material to a fully finished and assembled, usable product comprises several steps which can be eliminated by using this process as functional products can be created directly from the raw material at a fraction of the time originally consumed. Thus, AM has found applications in several sectors including automotive, aerospace, printed electronics, and healthcare...
July 24, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28713231/grip-force-and-3d-push-pull-force-estimation-based-on-semg-and-grnn
#10
Changcheng Wu, Hong Zeng, Aiguo Song, Baoguo Xu
The estimation of the grip force and the 3D push-pull force (push and pull force in the three dimension space) from the electromyogram (EMG) signal is of great importance in the dexterous control of the EMG prosthetic hand. In this paper, an action force estimation method which is based on the eight channels of the surface EMG (sEMG) and the Generalized Regression Neural Network (GRNN) is proposed to meet the requirements of the force control of the intelligent EMG prosthetic hand. Firstly, the experimental platform, the acquisition of the sEMG, the feature extraction of the sEMG and the construction of GRNN are described...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28693543/finite-element-analysis-of-porously-punched-prosthetic-short-stem-virtually-designed-for-simulative-uncemented-hip-arthroplasty
#11
Matthew Jian-Qiao Peng, Hai-Yan Chen, Yong Hu, XiangYang Ju, Bo Bai
BACKGROUND: There is no universal hip implant suitably fills all femoral types, whether prostheses of porous short-stem suitable for Hip Arthroplasty is to be measured scientifically. METHODS: Ten specimens of femurs scanned by CT were input onto Mimics to rebuild 3D models; their *stl format dataset were imported into Geomagic-Studio for simulative osteotomy; the generated *.igs dataset were interacted by UG to fit solid models; the prosthesis were obtained by the same way from patients, and bored by punching bears designed by Pro-E virtually; cements between femora and prosthesis were extracted by deleting prosthesis; in HyperMesh, all compartments were assembled onto four artificial joint style as: (a) cemented long-stem prosthesis; (b) porous long-stem prosthesis; (c) cemented short-stem prosthesis; (d) porous short-stem prosthesis...
July 11, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28675048/biomechanical-causes-of-trapeziometacarpal-arthroplasty-failure
#12
V Spartacus, A Mayoly, A Gay, T Le Corroller, M Némoz-Gaillard, S Roffino, P Chabrand
Trapeziometacarpal joint prosthesis revision has been widely reported, mainly due to loosening of the trapezium cup. Our hypothesis is that current prostheses do not sufficiently respect the kinematics of this joint. CT scan acquisitions enabled us to determine the position of the first metacarpal relative to the trapezium in three different characteristic postures, in subjects in different stages of arthrosis. A CAD model of a current prosthesis was inserted into the numerical 3D model of the joint under the different postures...
July 4, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28653808/a-novel-technique-for-reference-point-generation-to-aid-in-intraoral-scan-alignment
#13
Walter G Renne, Zachary P Evans, Anthony Mennito, Mark Ludlow
OBJECTIVE: When using a completely digital workflow on larger prosthetic cases it is often difficult to communicate to the laboratory or chairside Computer Aided Design and Computer Aided Manufacturing system the provisional prosthetic information. The problem arises when common hard tissue data points are limited or non-existent such as in complete arch cases in which the 3D model of the complete arch provisional restorations must be aligned perfectly with the 3D model of the complete arch preparations...
June 27, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28630937/high-precision-neural-decoding-of-complex-movement-trajectories-using-recursive-bayesian-estimation-with-dynamic-movement-primitives
#14
Guy Hotson, Ryan J Smith, Adam G Rouse, Marc H Schieber, Nitish V Thakor, Brock A Wester
Brain-machine interfaces (BMIs) are a rapidly progressing technology with the potential to restore function to victims of severe paralysis via neural control of robotic systems. Great strides have been made in directly mapping a user's cortical activity to control of the individual degrees of freedom of robotic end-effectors. While BMIs have yet to achieve the level of reliability desired for widespread clinical use, environmental sensors (e.g. RGB-D cameras for object detection) and prior knowledge of common movement trajectories hold great potential for improving system performance...
July 2016: IEEE Robotics and Automation Letters
https://www.readbyqxmd.com/read/28613063/-application-and-outlook-of-three-dimensional-printing-in-prosthetic-dentistry
#15
Y C Sun, R Li, Y S Zhou, Y Wang
At present, three-dimensional (3D) printing has been applied in many aspects in the field of prosthodontics, such as dental models, wax patterns, guide plates, dental restoration and customized implants. The common forming principles include light curing, sintering and melting-condensation, the materials include pure wax, resin, metal and ceramics. However, the printing precision and the strength of multi-material integrated forming, remains to be improved. In addition, as a technology by which the internal structure of a material can be customized manufacturing, further advantage of 3D printing used in the manufacture of dental restoration lies in the customization functional bionic micro-structures, but the related research is still in its infancy...
June 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28581710/biotransformation-of-silver-released-from-nanoparticle-coated-titanium-implants-revealed-in-regenerating-bone
#16
Hua Geng, Gowsihan Poologasundarampillai, Naomi Todd, Aine Devlin-Mullin, Katie L Moore, Zahra Golrokhi, James B Gilchrist, Eric Jones, Richard J Potter, Chris Sutcliffe, Marie O'Brien, David W L Hukins, Sarah Cartmell, Christopher A Mitchell, Peter D Lee
Antimicrobial silver nanoparticle coatings have attracted interest for reducing prosthetic joint infection. However, few studies report in vivo investigations of the biotransformation of silver nanoparticles within the regenerating tissue and its impact on bone formation. We present a longitudinal investigation of the osseointegration of silver nanoparticle-coated additive manufactured titanium implants in rat tibial defects. Correlative imaging at different time points using nanoscale secondary ion mass spectrometry, transmission electron microscopy (TEM), histomorphometry, and 3D X-ray microcomputed tomography provided quantitative insight from the nano- to macroscales...
June 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28578800/geometric-analysis-of-the-talus-and-development-of-a-generic-talar-prosthetic
#17
Alexandra Trovato, Marwan El-Rich, Samer Adeeb, Suki Dhillon, Nadr Jomha
BACKGROUND: Trauma to the talus can result in fracture, avascular necrosis and structural collapse. Treatment has been limited to surgical fusion and total ankle arthroplasty. Total ankle arthroplasty may not be an appropriate treatment for avascular necrosis while surgical fusion of the joint limits mobility. Custom-made implants have recently been used to address these limitations but have lengthy delays between injury and surgery and higher associated costs. A generic talar prosthesis available in various sizes may serve as a suitable alternative...
June 2017: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28576006/the-role-of-welding-techniques-in-the-biomechanical-behavior-of-implant-supported-prostheses
#18
Sabrina Alessandra Rodrigues, Anna Gabriella Camacho Presotto, Valentim Adelino Ricardo Barão, Rafael Leonardo Xediek Consani, Mauro Antônio Arruda Nóbilo, Marcelo Ferraz Mesquita
This in vitro study investigated the role of welding techniques of implant-supported prostheses in the 2D and 3D marginal misfits of prosthetic frameworks, strain induced on the mini abutment, and detorque of prosthetic screws. The correlations between the analyzed variables were also investigated. Frameworks were cast in commercially pure titanium (cp-Ti). A marginal misfit of 200μm was simulated in the working models (control group) (n=20). The 2D marginal misfit was analyzed according to the single-screw test protocol using a precision optical microscope...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28552791/three-dimensional-printing-technologies-applications-and-limitations-in-neurosurgery
#19
REVIEW
Josephine U Pucci, Brandon R Christophe, Jonathan A Sisti, Edward S Connolly
Three-dimensional (3D) printers are a developing technology penetrating a variety of markets, including the medical sector. Since its introduction to the medical field in the late 1980s, 3D printers have constructed a range of devices, such as dentures, hearing aids, and prosthetics. With the ultimate goals of decreasing healthcare costs and improving patient care and outcomes, neurosurgeons are utilizing this dynamic technology, as well. Digital Imaging and Communication in Medicine (DICOM) can be translated into Stereolithography (STL) files, which are then read and methodically built by 3D Printers...
May 24, 2017: Biotechnology Advances
https://www.readbyqxmd.com/read/28510720/effects-of-a-3d-segmental-prosthetic-system-for-tricuspid-valve-annulus-remodelling-on-the-right-coronary-artery-a-human-cadaveric-coronary-angiography-study
#20
Mohsen Riki-Marishani, Arash Gholoobi, Ghasem Sazegar, Mathias H Aazami, Aria Hedjazi, Maryam Sajjadian, Mahmoud Ebrahimi, Ahmad Aghaii-Zade Torabi
OBJECTIVES: A prosthetic system to repair secondary tricuspid valve regurgitation was developed. The conceptual engineering of the current device is based on 3D segmental remodelling of the tricuspid valve annulus in lieu of reductive annuloplasty. This study was designed to investigate the operational safety of the current prosthetic system with regard to the anatomical integrity of the right coronary artery (RCA) in fresh cadaveric human hearts. METHODS: During the study period, from January to April 2016, the current prosthetic system was implanted on the tricuspid valve annulus in fresh cadaveric human hearts that met the study's inclusion criteria...
May 16, 2017: Interactive Cardiovascular and Thoracic Surgery
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