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https://www.readbyqxmd.com/read/28097935/finite-element-simulations-of-the-head-brain-responses-to-the-top-impacts-of-a-construction-helmet-effects-of-the-neck-and-body-mass
#1
John Z Wu, Christopher S Pan, Bryan M Wimer, Charles L Rosen
Traumatic brain injuries are among the most common severely disabling injuries in the United States. Construction helmets are considered essential personal protective equipment for reducing traumatic brain injury risks at work sites. In this study, we proposed a practical finite element modeling approach that would be suitable for engineers to optimize construction helmet design. The finite element model includes all essential anatomical structures of a human head (i.e. skin, scalp, skull, cerebrospinal fluid, brain, medulla, spinal cord, cervical vertebrae, and discs) and all major engineering components of a construction helmet (i...
January 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28097687/requirements-for-accurate-estimation-of-anisotropic-material-parameters-by-magnetic-resonance-elastography-a-computational-study
#2
D J Tweten, R J Okamoto, P V Bayly
PURPOSE: To establish the essential requirements for characterization of a transversely isotropic material by magnetic resonance elastography (MRE). THEORY AND METHODS: Three methods for characterizing nearly incompressible, transversely isotropic (ITI) materials were used to analyze data from closed-form expressions for traveling waves, finite-element (FE) simulations of waves in homogeneous ITI material, and FE simulations of waves in heterogeneous material. Key properties are the complex shear modulus μ2 , shear anisotropy ϕ=μ1/μ2-1, and tensile anisotropy ζ=E1/E2-1...
January 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28097526/improved-measurement-of-elastic-properties-of-cells-by-micropipette-aspiration-and-its-application-to-lymphocytes
#3
Gustavo Esteban-Manzanares, Blanca González-Bermúdez, Julia Cruces, Mónica De la Fuente, Qingxuan Li, Gustavo V Guinea, José Pérez-Rigueiro, Manuel Elices, Gustavo R Plaza
Mechanical deformability of cells is an important property for their function and development, as well as a useful marker of cell state. The classical technique of micropipette aspiration allows single-cell studies and we provide here a method to measure the two basic mechanical parameters, elastic modulus and Poisson's ratio. The proposed method, developed from finite-element analysis of micropipette aspiration experiments, may be implemented in future technologies for the automated measurement of mechanical properties of cells, based on the micropipette aspiration technique or on the cell transit through flow constrictions...
January 17, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28097524/pubovisceralis-muscle-fiber-architecture-determination-comparison-between-biomechanical-modeling-and-diffusion-tensor-imaging
#4
Sofia Brandão, Marco Parente, Elisabete Silva, Thuane Da Roza, Teresa Mascarenhas, João Leitão, João Cunha, Renato Natal Jorge, Rita Gouveia Nunes
Biomechanical analysis of pelvic floor dysfunction requires knowledge of certain biomechanical parameters, such as muscle fiber direction, in order to adequately model function. Magnetic resonance (MR) diffusion tensor imaging (DTI) provides an estimate of overall muscle fiber directionality based on the mathematical description of water diffusivity. This work aimed at evaluating the concurrence between pubovisceralis muscle fiber representations obtained from DTI, and the maximum principal stress lines obtained through the finite element method...
January 17, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28097386/biomechanical-analysis-of-clavicle-hook-plate-implantation-with-different-hook-angles-in-the-acromioclavicular-joint
#5
Li-Kun Hung, Kuo-Chih Su, Wen-Hsien Lu, Cheng-Hung Lee
PURPOSE: A clavicle hook plate is a simple and effective method for treating acromioclavicular dislocation and distal clavicle fractures. However, subacromial osteolysis and peri-implant fractures are complicated for surgeons to manage. This study uses finite element analysis (FEA) to investigate the post-implantation biomechanics of clavicle hook plates with different hook angles. METHODS: This FEA study constructed a model with a clavicle, acromion, clavicle hook plate, and screws to simulate the implantation of clavicle hook plates at different hook angles (90°, 95°, 100°, 105°, and 110°) for treating acromioclavicular joint dislocations...
January 18, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28096941/transport-of-biomolecules-to-binding-partners-displayed-on-the-surface-of-microbeads-arrayed-in-traps-in-a-microfluidic-cell
#6
Xiaoxiao Chen, Thomas F Leary, Charles Maldarelli
Arrays of probe molecules integrated into a microfluidic cell are utilized as analytical tools to screen the binding interactions of the displayed probes against a target molecule. These assay platforms are useful in enzyme or antibody discovery, clinical diagnostics, and biosensing, as their ultraminiaturized design allows for high sensitivity and reduced consumption of reagents and target. We study here a platform in which the probes are first grafted to microbeads which are then arrayed in the microfluidic cell by capture in a trapping course...
January 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28095766/clamping-of-fine-kirschner-wires-in-external-fixators
#7
Ahmad R Zamani, S Olutunde Oyadiji
In Ilizarov circular (ring) external fixators, fine Kirschner wires are used to fix the bone to the fixator. Clamping of the wires to the rings with different bolt torques has been studied. However, the relation between the bolt torque and the fixation load applied to the wire was not investigated. In this work, finite element method is used to address this problem. Here, a fully three-dimensional model of the wire fixation assembly was built, with geometric details like threads on the bolt to produce a realistic simulation of the clamping of the wire...
November 2016: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28095035/validation-of-a-parametric-finite-element-human-femur-model
#8
Katelyn F Klein, Jingwen Hu, Matthew P Reed, Lawrence W Schneider, Jonathan D Rupp
Objective Finite element (FE) models with geometry and material properties that are parametric with subject descriptors, such as age and body shape/size, are being developed to incorporate population variability into crash simulations. However, the validation methods currently being used with these parametric models do not assess whether model predictions are reasonable in the space over which the model is intended to be used. This study presents a parametric model of the femur and applies a unique validation paradigm to this parametric femur model that characterizes whether model predictions reproduce experimentally observed trends...
January 17, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28095025/the-influence-of-personal-protection-equipment-occupant-body-size-and-restraint-system-on-the-frontal-impact-responses-of-hybrid-iii-atds-in-tactical-vehicles
#9
Lauren Wood Zaseck, Nichole Ritchie Orton, Rebekah Gruber, Jonathan Rupp, Risa Scherer, Matthew Reed, Jingwen Hu
OBJECTIVE: Although advanced restraint systems, such as seatbelt pretensioners, and load limiters, can provide improved occupant protection in crashes, such technologies are currently not utilized in military vehicles. The design and use of military vehicles presents unique challenges to occupant safety - including differences in compartment geometry and occupant clothing and gear - that make direct application of optimal civilian restraint systems to military vehicles inappropriate. For military vehicle environments, finite element (FE) modeling can be used to assess various configurations of restraint systems and determine the optimal configuration that minimizes injury risk to the occupant...
January 17, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28094763/measuring-the-effect-of-femoral-malrotation-on-knee-joint-biomechanics-for-total-knee-arthroplasty-using-computational-simulation
#10
K-T Kang, Y-G Koh, J Son, O-R Kwon, C Baek, S H Jung, K K Park
OBJECTIVES: Malrotation of the femoral component can result in post-operative complications in total knee arthroplasty (TKA), including patellar maltracking. Therefore, we used computational simulation to investigate the influence of femoral malrotation on contact stresses on the polyethylene (PE) insert and on the patellar button as well as on the forces on the collateral ligaments. MATERIALS AND METHODS: Validated finite element (FE) models, for internal and external malrotations from 0° to 10° with regard to the neutral position, were developed to evaluate the effect of malrotation on the femoral component in TKA...
November 2016: Bone & Joint Research
https://www.readbyqxmd.com/read/28093648/predicting-cell-viability-within-tissue-scaffolds-under-equiaxial-strain-multi-scale-finite-element-model-of-collagen-cardiomyocytes-constructs
#11
Mostafa Elsaadany, Karen Chang Yan, Eda Yildirim-Ayan
Successful tissue engineering and regenerative therapy necessitate having extensive knowledge about mechanical milieu in engineered tissues and the resident cells. In this study, we have merged two powerful analysis tools, namely finite element analysis and stochastic analysis, to understand the mechanical strain within the tissue scaffold and residing cells and to predict the cell viability upon applying mechanical strains. A continuum-based multi-length scale finite element model (FEM) was created to simulate the physiologically relevant equiaxial strain exposure on cell-embedded tissue scaffold and to calculate strain transferred to the tissue scaffold (macro-scale) and residing cells (micro-scale) upon various equiaxial strains...
January 16, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28092094/comparison-and-evaluation-of-stresses-generated-by-rapid-maxillary-expansion-and-the-implant-supported-rapid-maxillary-expansion-on-the-craniofacial-structures-using-finite-element-method-of-stress-analysis
#12
Varun Jain, Tarulatha R Shyagali, Prabhuraj Kambalyal, Yagnesh Rajpara, Jigar Doshi
BACKGROUND: The study aimed to evaluate and compare the stress distribution and 3-dimensional displacements along the craniofacial sutures in between the Rapid maxillary Expansion (RME) and Implant supported RME (I-RME). METHODS: Finite element model of the skull and the implants were created using ANSYS software. The finite element model thus built composed of 537692 elements and 115694 nodes in RME model & 543078 elements and 117948 nodes with implants model. The forces were applied on the palatal surface of the posterior teeth to cause 5mm of transverse displacement on either side of the palatal halves, making it a total of 10mm...
December 2017: Progress in Orthodontics
https://www.readbyqxmd.com/read/28091724/automatic-ct-based-finite-element-model-generation-for-temperature-based-death-time-estimation-feasibility-study-and-sensitivity-analysis
#13
Sebastian Schenkl, Holger Muggenthaler, Michael Hubig, Bodo Erdmann, Martin Weiser, Stefan Zachow, Andreas Heinrich, Felix Victor Güttler, Ulf Teichgräber, Gita Mall
Temperature-based death time estimation is based either on simple phenomenological models of corpse cooling or on detailed physical heat transfer models. The latter are much more complex but allow a higher accuracy of death time estimation, as in principle, all relevant cooling mechanisms can be taken into account.Here, a complete workflow for finite element-based cooling simulation is presented. The following steps are demonstrated on a CT phantom: Computer tomography (CT) scan Segmentation of the CT images for thermodynamically relevant features of individual geometries and compilation in a geometric computer-aided design (CAD) model Conversion of the segmentation result into a finite element (FE) simulation model Computation of the model cooling curve (MOD) Calculation of the cooling time (CTE) For the first time in FE-based cooling time estimation, the steps from the CT image over segmentation to FE model generation are performed semi-automatically...
January 14, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28091721/influence-of-tooth-dimension-on-the-initial-mobility-based-on-plaster-casts-and-x-ray-images-a-numerical-study
#14
Martin Hartmann, Cornelius Dirk, Susanne Reimann, Ludger Keilig, Anna Konermann, Andreas Jäger, Christoph Bourauel
AIMS: The goal was to determine the influence of different geometric parameters of the tooth on the initial tooth mobility and the position of the center of resistance employing numerical models based on scaled X-ray images and plaster casts. METHODS: The dimensions of tooth 21 were measured in 21 patients, using radiographs and dental casts. Length and mesiodistal width of the tooth were obtained from the X-ray image and the orovestibular diameter from the plaster cast...
January 13, 2017: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/28090746/development-of-an-in-vivo-visual-robot-system-with-a-magnetic-anchoring-mechanism-and-a-lens-cleaning-mechanism-for-laparoendoscopic-single-site-surgery-less
#15
Haibo Feng, Dinghui Dong, Tengfei Ma, Jinlei Zhuang, Yili Fu, Yi Lv, Liyi Li
BACKGROUND: Surgical robot systems which can significantly improve surgical procedures have been widely used in laparoendoscopic single-site surgery (LESS). For a relative complex surgical procedure, the development of an in vivo visual robot system for LESS can effectively improve the visualization for surgical robot systems. METHODS: In this work, an in vivo visual robot system with a new mechanism for LESS was investigated. A finite element method (FEM) analysis was carried out to ensure the safety of the in vivo visual robot during the movement, which was the most important concern for surgical purposes...
January 16, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28090133/impacts-of-changes-of-indoor-air-pressure-and-air-exchange-rate-in-vapor-intrusion-scenarios
#16
Rui Shen, Eric M Suuberg
There has, in recent years, been increasing interest in understanding the transport processes of relevance in vapor intrusion of volatile organic compounds (VOCs) into buildings on contaminated sites. These studies have included fate and transport modeling. Most such models have simplified the prediction of indoor air contaminant vapor concentrations by employing a steady state assumption, which often results in difficulties in reconciling these results with field measurements. This paper focuses on two major factors that may be subject to significant transients in vapor intrusion situations, including the indoor air pressure and the air exchange rate in the subject building...
February 1, 2016: Building and Environment
https://www.readbyqxmd.com/read/28090032/the-influence-of-elastic-moduli-of-core-materials-on-shear-stress-distributions-at-the-adhesive-interface-in-resin-built-up-teeth
#17
Ayaka Chiba, Takashi Hatayama, Kimisuke Kainose, Masatoshi Nakajima, David H Pashley, Noriyuki Wakabayashi, Junji Tagami
This study aimed to investigate shear stress distributions in resin built-up teeth using resin composites of varying elastic moduli (E), with or without fiber posts. Three-dimensional mathematical models of a root-filled mandibular premolar tooth were constructed. Resin post and cores were built-up with resin composites of three different E: 12,000, 18,000 and 24,000 MPa, with or without fiber posts. Finite element linear analysis was performed to calculate shear stress distributions at bonding interface between resin core and dentin...
January 13, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28089389/three-dimensional-finite-element-model-to-predict-patterns-of-pterygomaxillary-dysjunction-during-le-fort-i-osteotomy
#18
H Fujii, N Kuroyanagi, T Kanazawa, S Yamamoto, H Miyachi, K Shimozato
The aim of this study was to determine whether non-linear three-dimensional finite element analysis (3D-FEA) can be applied to simulate pterygomaxillary dysjunction during Le Fort I osteotomy (LFI) not involving a curved osteotome (LFI-non-COSep), and to predict potential changes in the fracture pattern associated with extending the cutting line. Computed tomography (CT) image data (100 snapshots) after LFI were converted to 3D-CT images. 3D-FEA models were built using preoperative CT matrix data and used to simulate pterygomaxillary dysjunction...
January 12, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28089330/finite-element-analysis-of-implant-assisted-removable-partial-dentures-framework-design-considerations
#19
Reza Shahmiri, Raj Das
STATEMENT OF PROBLEM: Connecting an acrylic resin base to both a metal framework and a rigidly fixed implant may affect the rotational displacement of the prosthesis during loading. PURPOSE: The purpose of this finite element analysis study was to analyze the effect of connecting a denture base metal framework to an implant with the aim of decreasing the rotational movement of an implant-assisted removable partial denture. MATERIAL AND METHODS: A mesial occlusal rest direct retainer and a distal occlusal rest direct retainer were modeled and adapted to incorporate a modified denture base metal framework in the connection area for each model...
January 12, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28089326/mechanical-response-of-common-millet-panicum-miliaceum-seeds-under-quasi-static-compression-experiments-and-modeling
#20
Benjamin P J Hasseldine, Chao Gao, Joseph M Collins, Hyun-Do Jung, Tae-Sik Jang, Juha Song, Yaning Li
The common millet (Panicum miliaceum) seedcoat has a fascinating complex microstructure, with jigsaw puzzle-like epidermis cells articulated via wavy intercellular sutures to form a compact layer to protect the kernel inside. However, little research has been conducted on linking the microstructure details with the overall mechanical response of this interesting biological composite. To this end, an integrated experimental-numerical-analytical investigation was conducted to both characterize the microstructure and ascertain the microscale mechanical properties and to test the overall response of kernels and full seeds under macroscale quasi-static compression...
January 6, 2017: Journal of the Mechanical Behavior of Biomedical Materials
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