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https://www.readbyqxmd.com/read/27932851/computational-fluid-dynamic-modeling-of-a-medium-sized-surface-mine-blasthole-drill-shroud
#1
Y Zheng, W R Reed, L Zhou, J P Rider
The Pittsburgh Mining Research Division of the U.S. National Institute for Occupational Safety and Health (NIOSH) recently developed a series of models using computational fluid dynamics (CFD) to study airflows and respirable dust distribution associated with a medium-sized surface blasthole drill shroud with a dry dust collector system. Previously run experiments conducted in NIOSH's full-scale drill shroud laboratory were used to validate the models. The setup values in the CFD models were calculated from experimental data obtained from the drill shroud laboratory and measurements of test material particle size...
November 2016: Mining Engineering
https://www.readbyqxmd.com/read/27932001/shale-gas-development-and-cancer-incidence-in-southwest-pennsylvania
#2
M L Finkel
OBJECTIVE: To what extent does unconventional gas development lead to an increase in cancer incidence in heavily drilled Southwest Pennsylvania? STUDY DESIGN: Ecological study. METHODS: Data for urinary bladder, thyroid and leukaemia were abstracted from the Pennsylvania Cancer Registry (PCR). Cancer incidence among counties with high, moderate and minimal number of producing wells is compared before drilling activity and thereafter. Observed vs expected cases, standardized incidence ratio and 95% confidence intervals are presented...
December 2016: Public Health
https://www.readbyqxmd.com/read/27931773/protective-effect-of-propofol-on-noise-induced-hearing-loss
#3
Jian Wen, Na Duan, Qiang Wang, Gui-Xia Jing, Ying Xiao
PURPOSE: Iatrogenic noise produced by mastoid or craniotomy drills may cause hearing damage, which is induced by the generation of reactive oxygen species (ROS) and the reduction of cochlear blood flow (CoBF). This study investigated whether propofol could reduce noise-induced hearing loss (NIHL) in a guinea pig model. METHODS: Sixty-four male pigmented guinea pigs were randomly and equally divided into 4 groups: control, noise, propofol and propofol+noise. Propofol was infused intravenously for 20 min prior to noise exposure with a loading dose of 5 mg·kg(-1) for 5 min and a maintenance infusion of 20 mg·kg(-1)·h(-1) for 135 min...
December 5, 2016: Brain Research
https://www.readbyqxmd.com/read/27930877/short-term-results-from-seventy-six-patients-receiving-a-bone-anchored-hearing-implant-installed-with-a-novel-minimally-invasive-surgery-technique
#4
M L Johansson, R J Stokroos, R Banga, M K Hol, E A Mylanus, H Savage Jones, J R Tysome, P Vannucchi, J R Hof, J W Brunings, J van Tongeren, R W Lutgert, A Banerjee, J P Windfuhr, A Caruso, A L Giannuzzi, S Bordin, J Hanif, N Schart-Morén, S Singam, S Jonhede, M Holmberg, C W Cremers, M Hultcrantz
The surgical installation of bone anchored hearing systems (BAHS) has after decades finally undergone changes towards more minimally invasive techniques without soft tissue thinning. Some surgeons are also performing the surgery and installation, using the classical drilling system, through a single punch entry. This article is protected by copyright. All rights reserved.
December 8, 2016: Clinical Otolaryngology
https://www.readbyqxmd.com/read/27930520/is-retrograde-drilling-really-useful-for-osteochondral-lesion-of-talus-with-subchondral-cyst-a-case-report
#5
Seong-Yup Jeong, Jong-Kil Kim, Kwang-Bok Lee
RATIONALE: Retrograde drilling is a well accepted procedure for osteochondral lesion of the talus and subchondral cyst with intact overlying cartilage. It has good results in most reports. Compared to anterograde drilling, retrograde drilling can protect the integrity of the articular cartilage. The purpose of this study was to evaluate the suitability of using retrograde drilling for osteochondral lesion with subchondral cyst and discuss the mechanism involved in the development of subchondral cyst...
December 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27930463/navigation-system-approach-in-zygomatic-implant-technique
#6
Giulio Gasparini, Roberto Boniello, Andreina Laforì, Paolo De Angelis, Vito Del Deo, Alessandro Moro, Gianmarco Saponaro, Sandro Pelo
In some patients, the resolution of severe maxillary atrophies can be hardly achieved without the use of zygomatic implants. Although many scientific studies have already demonstrated the excellent immediate stability in long term, the use of zygomatic implants is not yet widespread. Among the complications of this technique, the most threatening is the risk of damaging the eyeball or the maxillary nerve.The use of the navigator system as a surgical aid for implant placement allows to control, at any time, the position of the drill in the bone, avoiding any injury to ocular and nervous structures...
December 7, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27930456/effects-of-a-modified-vitrectomy-probe-in-small-gauge-vitrectomy-an-experimental-study-on-the-flow-and-on-the-traction-exerted-on-the-retina
#7
Stanislao Rizzo, Gualtiero Fantoni, Giovanni de Santis, Jaw-Chyng Lormen Lue, Jonathan Ciampi, Michele Palla, Federica Genovesi Ebert, Alfonso Savastano, Carmelo De Maria, Giovanni Vozzi, Rodrigo A Brant Fernandes, Francesco Faraldi, Giuseppe Criscenti
PURPOSE: Thorough this experimental study, the physic features of a modified 23-gauge vitrectomy probe were evaluated in vitro. METHODS: A modified vitrectomy probe to increase vitreous outflow rate with a small-diameter probe, that also minimized tractional forces on the retina, was created and tested. The "new" probe was created by drilling an opening into the inner duct of a traditional 23-gauge probe with electrochemical or electrodischarge micromachining. Both vitreous outflow and tractional forces on the retina were examined using experimental models of vitreous surgery...
December 7, 2016: Retina
https://www.readbyqxmd.com/read/27929142/an-experimental-investigation-of-the-risk-of-triggering-geological-disasters-by-injection-under-shear-stress
#8
Yixin Liu, Jiang Xu, Shoujian Peng
Fluid injection has been applied in many fields, such as hazardous waste deep well injection, forced circulation in geothermal fields, hydraulic fracturing, and CO2 geological storage. However, current research mainly focuses on geological data statistics and the dominating effects of pore pressure. There are only a few laboratory-conditioned studies on the role of drilling boreholes and the effect of injection pressure on the borehole wall. Through experimental phenomenology, this study examines the risk of triggering geological disasters by fluid injection under shear stress...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27928496/bioactive-mesoporous-wollastonite-particles-for-bone-tissue-engineering
#9
S Saravanan, Nagarajan Selvamurugan
The current investigation was aimed at identifying the role of mesoporous wollastonite particles on the healing of rat tibial bone defect. The bone defect was created with a 3-mm-diameter dental drill, and it was filled with mesoporous wollastonite particles. After second and fourth weeks of filling treatments, it was found that mesoporous wollastonite particles promoted bone formation as evidenced by X-ray, histological, scanning electron microscope, and energy-dispersive spectra studies. X-ray study showed the closure of drill hole as seen by high-dense radio-opacity image...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27928203/accelerometer-load-profiles-for-basketball-specific-drills-in-elite-players
#10
Xavi Schelling, Lorena Torres
The purpose of this study was to quantify the workload during basketball-specific drills measured through microtechnology. Twelve professional male basketball players from the Spanish 1(st) Division were monitored over a 4-week period. Data were collected from 16 sessions, for a total of 95 ± 33 drills per player. Workload data (Acceleration load; AL) were obtained from a tri-axial accelerometer at 100Hz sampling frequency, and were expressed over time (AL(.)min(-1)). Comparisons among training drills (i.e...
December 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27927616/safety-of-hip-anchor-insertion-from-the-midanterior-and-distal-anterolateral-portals-with-a-straight-drill-guide-a-cadaveric-study
#11
Ryan M Degen, Lazaros Poultsides, Stephanie W Mayer, Angela E Li, Struan H Coleman, Anil S Ranawat, Danyal H Nawabi, Bryan T Kelly
BACKGROUND: During arthroscopic labral refixation, suture anchors are typically inserted from either the midanterior (MA) portal or the distal anterolateral (DALA) portal; however, no studies have previously compared these techniques. PURPOSE/HYPOTHESIS: The purpose of this study was to compare acetabular rim accessibility and associated complication rates of anchor insertion from these portals. We hypothesized that rim access would be better from the DALA portal...
December 7, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27927567/probing-and-tapping-are-we-inserting-pedicle-screws-correctly
#12
Vishal Prasad, Addisu Mesfin, Robert Lee, Julie Reigrut, John Schmidt
PURPOSE: Although there are a significant number of research publications on the topic of bone morphology and the strength of bone, the clinical significance of a failed pedicle screw is often revision surgery and the potential for further postoperative complications; especially in elderly patients with osteoporotic bone. The purpose of this report is to quantify the mechanical strength of the foam-screw interface by assessing probe/pilot hole diameter and tap sizes using statistically relevant sample sizes under highly controlled test conditions...
November 2016: Spine Deformity
https://www.readbyqxmd.com/read/27919119/-osteochondritis-dissecans-of-the-talus-a-critical-review
#13
J Bruns, C R Habermann, J P Petersen
The etiology remains unclear. Mechanical factors seem to play an important role. Most histologies report clefts between the cartilage and bone and necrotic areas. Several classifications have been published based on observations from imaging techniques or on intraoperative findings. Clinical symptoms are unspecific. Imaging techniques are of great importance: X-rays of the ankle joint enable a quick diagnostic overview. MRT is the imaging-technique of choice for diagnosing OCDT-lesions. Regarding treatment, a tremendous number of retrospective publications exist...
April 2016: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/27918313/a-comparison-of-the-mechanical-measures-used-for-assessing-orthodontic-mini-implant-stability
#14
Yara K Hosein, S Jeffrey Dixon, Amin S Rizkalla, Ali Tassi
PURPOSE: Mechanical loosening remains a common complication associated with mini-implant failure. The purpose of this study was to compare common mechanical measures of mini-implant stability to determine their association and reliability. MATERIALS AND METHODS: Ninety self-drilling orthodontic mini-implants from 6 manufacturers were inserted into artificial bone blocks. Insertion torques (ITs) and Periotest values (PVs) were measured. Subsequently, mini-implants underwent pull-out testing for measures of pull-out load (POL) and screw displacement (ScrD)...
December 1, 2016: Implant Dentistry
https://www.readbyqxmd.com/read/27914777/polonium-210-accumulates-in-a-lake-receiving-coal-mine-discharges-anthropogenic-or-natural
#15
A W Nelson, E S Eitrheim, A W Knight, D May, M D Wichman, T Z Forbes, M K Schultz
Coal is an integral part of global energy production; however, coal mining is associated with numerous environmental health impacts. It is well documented that coal-mine waste can contaminate the environment with naturally-occurring radionuclides from the uranium-238 ((238)U) decay series. However, the behavior of the final radionuclide in the (238)U-series, i.e., polonium-210 ((210)Po) arising from coal-mine waste-water discharge is largely unexplored. Here, results of a year-long (2014-2015) field study, in which the concentrations of (210)Po in sediments and surface water of a lake that receives coal-mine waste-water discharge in West Virginia are presented...
November 30, 2016: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/27913339/a-parametric-study-for-the-design-of-an-optimized-ultrasonic-percussive-planetary-drill-tool
#16
Xuan Li, Patrick Harkness, Kevin Worrall, Ryan Timoney, Margaret Lucas
Traditional rotary drilling for planetary rock sampling, in-situ analysis and sample return, is challenging because the axial force and holding torque requirements are not necessarily compatible with lightweight spacecraft architectures in low-gravity environments. This article seeks to optimize an ultrasonic-percussive drill tool to achieve rock penetration with lower reacted force requirements, with a strategic view towards building an Ultrasonic Planetary Core Drill (UPCD) device. The UPCD is a descendant of the Ultrasonic/Sonic Driller/Corer (USDC) technique...
November 29, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27913176/rotary-ultrasonic-bone-drilling-improved-pullout-strength-and-reduced-damage
#17
Vishal Gupta, Pulak M Pandey, Vadim V Silberschmidt
Bone drilling is one of the most common operations used to repair fractured parts of bones. During a bone drilling process, microcracks are generated on the inner surface of the drilled holes that can detrimentally affect osteosynthesis and healing. This study focuses on the investigation of microcracks and pullout strength of cortical-bone screws in drilled holes. It compares conventional surgical bone drilling (CSBD) with rotary ultrasonic bone drilling (RUBD), a novel approach employing ultrasonic vibration with a diamond-coated hollow tool...
November 29, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27911234/ventriculostomy-associated-hemorrhage-a-risk-assessment-by-radiographic-simulation
#18
Faith C Robertson, Muhammad M Abd-El-Barr, Srinivasan Mukundan, William B Gormley
OBJECTIVE Ventriculostomy entry sites are commonly selected by freehand estimation of Kocher's point or approximations from skull landmarks and a trajectory toward the ipsilateral frontal horn of the lateral ventricles. A recognized ventriculostomy complication is intracranial hemorrhage from cortical vessel damage; reported rates range from 1% to 41%. In this report, the authors assess hemorrhagic risk by simulating traditional ventriculostomy trajectories and using CT angiography (CTA) with venography (CTV) data to identify potential complications, specifically from cortical draining veins...
December 2, 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27910205/neurosurgical-robotic-arm-drilling-navigation-system
#19
Chung-Chih Lin, Hsin-Cheng Lin, Wen-Yo Lee, Shih-Tseng Lee, Chieh-Tsai Wu
BACKGROUND: The aim of this work was to develop a neurosurgical robotic arm drilling navigation system that provides assistance throughout the complete bone drilling process. METHODS: The system comprised neurosurgical robotic arm navigation combining robotic and surgical navigation, 3D medical imaging based surgical planning that could identify lesion location and plan the surgical path on 3D images, and automatic bone drilling control that would stop drilling when the bone was to be drilled-through...
December 2, 2016: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/27909681/double-bundle-all-inside-posterior-cruciate-ligament-reconstruction-a-technique-using-2%C3%A2-separate-autologous-grafts
#20
Roy A G Hoogeslag, Bart W Oudelaar, Rianne Huis In't Veld, Reinoud W Brouwer
In a double-bundle posterior cruciate ligament reconstruction, several surgical techniques are available. Compared with other techniques, the advantages of the all-inside technique and cortical suspension devices with variable loop length are that shorter grafts can be used, tendons can be quadrupled, and a double-bundle posterior cruciate ligament reconstruction can be performed with autologous grafts. Furthermore, the all-inside technique provides independent outside-in socket reaming and is soft tissue, cortex, and bone sparing because no full diameter tunnels but sockets are created with a small diameter guide pin, which can transform into a retrograde drill...
October 2016: Arthroscopy Techniques
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