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https://www.readbyqxmd.com/read/28730109/human-eye-ocular-component-analysis-for-refractive-state-and-refractive-surgery
#1
Chao-Kai Chang, Jui-Teng Lin, Yong Zhang
AIM: To analyze the clinical factors influencing the human vision corrections via the changing of ocular components of human eye in various applications; and to analyze refractive state via a new effective axial length. METHODS: An effective eye model was introduced by the ocular components of human eye including refractive indexes, surface radius (r1, r2, R1, R2) and thickness (t, T) of the cornea and lens, the anterior chamber depth (S1) and the vitreous length (S2)...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28729643/superhydrophobic-drag-reduction-spherical-bearing-fabricated-by-laser-ablation-and-pei-regulated-zno-nanowire-growth
#2
Rui Weng, Haifeng Zhang, Yanjing Tuo, Yang Wang, Xiaowei Liu
The resistance of the bearing is a significant factor affecting the performance of the ball-disk rotor gyroscope. The micro and nano combined surface with low surface energy material modifications can be hydrophobic. This can reduce the drag when the bearing is lubricated by deionized water. Laser ablation method is utilized to form micron-scaled structures on the surface of the stainless steel rotor ball. And the nanostructures are formed by PEI (Polyetherimide) regulated ZnO nanowires growth. After low surface energy material modification, the water contact angle of processed surface was 163° and the sliding angle was less than 4°...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28727202/influence-of-the-left-atrial-contact-areas-on-fixed-low-voltage-zones-during-atrial-fibrillation-and-sinus-rhythm-in-persistent-atrial-fibrillation
#3
Shiro Nakahara, Yuichi Hori, Naoki Nishiyama, Yasuo Okumura, Reiko Fukuda, Sayuki Kobayashi, Takaaki Komatsu, Yoshihiko Sakai, Isao Taguchi
BACKGROUND: Atrial low-voltage zones (LVZ) are suggested as important factors for maintaining persistent atrial fibrillation (PsAF). The relationship between LVZs and left atrial (LA) contact areas (CoAs) is still unclear. OBJECTIVE: To assess whether CoA regions were involved in atrial substrate properties maintaining PsAF. METHODS: A total of 50 patients with PsAF (36 long-lasting) were analyzed. Three representative CoA detection areas (ascending aorta-anterior-LA, descending aorta-left pulmonary vein antrum, and vertebrae-posterior-LA) were registered on the mapping geometry...
July 20, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/28724823/topography-guided-neutralization-technique-for-the-management-of-flap-complication-in-laser-in-situ-keratomileusis
#4
Rohit Shetty, Rushad Shroff, Tushar Grover, T Roshan, Chaitra Jayadev
A 29-year-old male was referred following a flap loss after the creation of a thin, irregular flap with a visual acuity of logMAR 0.1 with -2.0 DS-2.75 DC × 175°. Corneal topography and anterior segment optical coherence tomography revealed an irregular corneal curvature and epithelial profile. Phototherapeutic keratectomy (PTK) followed by Topography - Guided Custom Ablation Treatment (TCAT), as a modification of the topographic neutralization technique protocol, was planned to regularize the corneal surface and treat the residual refractive error...
July 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28722134/location-variations-and-predictors-of-epicardial-fat-mapping-using-multi-detector-computed-tomography-to-assist-epicardial-ventricular-tachycardia-ablation
#5
Mariaileen Sourwine, Jean Jeudy, Brian Miller, Rama Vunnam, Hasan Imanli, Olurotimi Mesubi, Martine Etienne-Mesubi, Vincent See, Stephen Shorofsky, Timm Dickfeld
BACKGROUND: A significant number of ventricular tachycardia circuits are located close to the epicardial surface and are amendable to epicardial ablation. Epicardial fat often interferes with substrate mapping and ablation, though little is known regarding the distribution of fat and its fluctuation with the cardiac cycle. METHODS: We studied 40 patients who underwent a 64-slice MDCT in order to describe patterns of epicardial fat distribution, variation during cardiac cycle and clinical predictors of epicardial fat...
July 19, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28719150/can-principles-of-the-surface-potential-be-combined-with-knowledge-of-natural-products-to-reduce-atrial-rhythm-disturbances
#6
EDITORIAL
H Ni, K Narsingani, H Zhang, W R Giles
Long lasting or chronic electrophysiological abnormalities in human atria are significant contributors to morbidity during healthy aging. Although both paroxysmal (brief) and chronic atrial fibrillation (AF) were considered to be benign; the notable association between maintained AF and stroke has resulted in AF now being a target for surgical intervention (ablation) and/or drug therapy. An interesting, forward looking paper from the Elinder Group(1) in this issue of Acta Physiologica reveals novel pharmacological agents and principles that could be the basis for more effective antiarrhythmic therapies for AF...
July 18, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28718904/autologous-serum-eye-drops-and-enhanced-epithelial-healing-time-after-photorefractive-keratectomy
#7
Hanife Tuba Akcam, Metin Unlu, Emine Esra Karaca, Hulya Yazici, Bahri Aydin, Ahmet Murad Hondur
BACKGROUND: The aim of the study is to test whether use of autologous serum eye-drops can provide earlier epithelial healing following the application of photorefractive keratectomy. METHOD: Sixty patients (60 eyes) underwent photorefractive keratectomy for myopia. Thirty eyes received autologous serum drops (Study group) while 30 eyes received conventional artificial tears (Control group) after photorefractive keratectomy. An 8 mm epithelial opening was prepared with the application of 18 per cent alcohol for 20 seconds...
July 18, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/28718001/a-new-device-for-fiducial-registration-of-image-guided-navigation-system-for-liver-rfa
#8
Nobutaka Doba, Hiroyuki Fukuda, Kazushi Numata, Yoshiteru Hao, Kouji Hara, Akito Nozaki, Masaaki Kondo, Makoto Chuma, Katsuaki Tanaka, Shigeo Takebayashi, Norihiro Koizumi, Akira Kobayashi, Junichi Tokuda, Shin Maeda
PURPOSE: Radiofrequency ablation for liver tumors (liver RFA) is widely performed under ultrasound guidance. However, discriminating between the tumor and the needle is often difficult because of cavitation caused by RFA-induced coagulation. An unclear ultrasound image can lead to complications and tumor residue. Therefore, image-guided navigation systems based on fiducial registration have been developed. Fiducial points are usually set on a patient's skin. But the use of internal fiducial points can improve the accuracy of navigation...
July 17, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28715202/antifouling-biomimetic-liquid-infused-stainless-steel-application-to-dairy-industrial-processing
#9
Sawsen Zouaghi, Thierry Six, Séverine Bellayer, Sona Moradi, Savvas G Hatzikiriakos, Thomas Dargent, Vincent Thomy, Yannick Coffinier, Christophe André, Guillaume Delaplace, Maude Jimenez
Fouling is a widespread and costly issue, faced by all food-processing industries. Particularly, in the dairy sector, where thermal treatments are mandatory to ensure product safety, heat-induced fouling represents up to 80% of the total production costs. Significant environmental impacts, due the massive consumption of water and energy, are also to deplore. Fouling control solutions are thus desperately needed, as they would lead to substantial financial gains, as well as tremendous progress toward eco-responsible processes...
July 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28713063/radiofrequency-ablation-for-the-treatment-of-weight-regain-after-roux-en-y-gastric-bypass-surgery
#10
Julian A Abrams, Sri Komanduri, Nicholas J Shaheen, Zengri Wang, Richard I Rothstein
BACKGROUND AND AIMS: Roux-en-Y gastric bypass (RYGB) surgery is an established modality for the treatment of morbid obesity. However, approximately one-quarter of patients experience weight regain after initially successful weight loss. Endoscopic therapy targeting the gastric remnant pouch represents a novel potential strategy to re-induce weight loss in this population. We performed a pilot trial of radiofrequency ablation (RFA) of the gastric remnant pouch after RYGB to determine feasibility, safety and efficacy for weight loss...
July 13, 2017: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/28709036/hydroxyapatite-and-bioactive-glass-surfaces-for-fiber-reinforced-composite-implants-via-surface-ablation-by-excimer-laser
#11
Julia Kulkova, Niko Moritz, Hannu Huhtinen, Riina Mattila, Ivan Donati, Eleonora Marsich, Sergio Paoletti, Pekka K Vallittu
In skeletal reconstructions, composites, such as bisphenol-A-glycidyldimethacrylate resin reinforced with glass fibers, are potentially useful alternatives to metallic implants. Recently, we reported a novel method to prepare bioactive surfaces for these composites. Surface etching by Excimer laser was used to expose bioactive glass granules embedded in the resin. The purpose of this study was to analyze two types of bioactive surfaces created by this technique. The surfaces contained bioactive glass and hydroxyapatite granules...
July 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28708898/retreatment-strategies-following-small-incision-lenticule-extraction-smile-in-vivo-tissue-responses
#12
Andri K Riau, Yu-Chi Liu, Chris H L Lim, Nyein C Lwin, Ericia P Teo, Gary H Yam, Donald T Tan, Jodhbir S Mehta
With any refractive correction, including Small Incision Lenticule Extraction (SMILE), there may be a residual refractive error that requires a retreatment. Here, we investigated the tissue responses following various retreatment procedures in a rabbit model of SMILE. All rabbits underwent a -6.00D correction with SMILE. Two weeks later, they underwent -1.00D enhancement by: (i) VisuMax Circle, followed by excimer ablation (S+C); (ii) secondary SMILE anterior to the primary procedure (S+SE); or (iii) surface ablation (S+P), and were examined for 28 days...
2017: PloS One
https://www.readbyqxmd.com/read/28708381/microfabrication-of-monolithic-microfluidic-platforms-using-low-temperature-co-fired-ceramics-suitable-for-fluorescence-imaging
#13
Pedro Couceiro, Julián Alonso-Chamarro
In this work, the influence of laser ablation and lamination parameters in the fabrication of embedded microstructures using Low Temperature Co-Fired Ceramics, have been studied. First, the influence of laser ablation parameters in the dimensions of fabricated microchannels in Low Temperature Co-Fired Ceramics substrates was characterized and strategies for tailoring the microchannels aspect ratios are described. The influence of lamination conditions on the fabrication of monolithically embedded microstructures is presented...
July 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28708182/multi-beam-pulsed-laser-patterning-of-plasmonic-films-using-broadband-diffractive-optical-elements
#14
A A Kuchmizhak, A P Porfirev, S A Syubaev, P A Danilov, A A Ionin, O B Vitrik, Yu N Kulchin, S N Khonina, S I Kudryashov
Multi-sector broadband diffractive optical elements (DOEs) were designed and fabricated from fused silica for high-efficiency multiplexing of femtosecond and nanosecond Gaussian laser beams into multiple (up to one 100) optically tunable microbeams with increased high-numerical aperture (NA) focal depths. Various DOE-related issues, such as high-NA laser focusing, laser pulsewidth, and DOE symmetry-dependent heat conduction effects, as well as the corresponding spatial resolution, were discussed in the context of high-throughput laser patterning...
July 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28707848/frontiers-in-non-invasive-cardiac-mapping-future-implications-for-arrhythmia-treatment
#15
Antonio Frontera, Ghassen Cheniti, Claire A Martin, Masateru Takigawa, Josselin Duchateau, Stephane Puyo, Ruairidh Martin, Nathaniel Thompson, Takeshi Kitamura, Konstantinos Vlachos, Michael Wolf, Nora Al-Jefairi, Gregoire Massouille, Thomas Pambrun, Arnaud Denis, Frederic Sacher, Nicolas Derval, Remis Dubois, Pierre Jaïs, Meleze Hocini, Michel Haissaguerre
Electrocardiographic mapping (ECM) is a non invasive technique using body surface potentials and CT geometry to reconstruct epicardial maps. ECM is emerging as an important tool not only for diagnostic mapping, but also as a guide for trans-catheter ablation of complex arrhythmias such as atrial fibrillation. It provides the clinician with an immediate global view of the substrate, allowing easier pre-procedural planning, potential improving clinical outcomes. Panoramic mapping of ventricular fibrillation (VF) is helping to develop a better understanding of its physiology, with future implications for the identification of therapeutic targets in patients with structural heart disease, as well as in idiopathic VF...
July 12, 2017: Minerva Cardioangiologica
https://www.readbyqxmd.com/read/28707266/6-ohda-lesioned-adult-zebrafish-as-a-useful-parkinson-s-disease-model-for-dopaminergic-neuroregeneration
#16
Yuganthini Vijayanathan, Fei Tieng Lim, Siong Meng Lim, Chiau Ming Long, Maw Pin Tan, Abu Bakar Abdul Majeed, Kalavathy Ramasamy
Conventional mammalian models of neurodegeneration are often limited by futile axonogenesis with minimal functional recuperation of severed neurons. The emergence of zebrafish, a non-mammalian model with excellent neuroregenerative properties, may address these limitations. This study aimed to establish an adult zebrafish-based, neurotoxin-induced Parkinson's disease (PD) model and subsequently validate the regenerative capability of dopaminergic neurons (DpN). The DpN of adult male zebrafish (Danio rerio) were lesioned by microinjecting 6-hydroxydopamine (6-OHDA) neurotoxin (6...
July 13, 2017: Neurotoxicity Research
https://www.readbyqxmd.com/read/28704537/non-invasive-localization-of-atrial-ectopic-beats-by-using-simulated-body-surface-p-wave-integral-maps
#17
Ana Ferrer-Albero, Eduardo J Godoy, Miguel Lozano, Laura Martínez-Mateu, Felipe Atienza, Javier Saiz, Rafael Sebastian
Non-invasive localization of continuous atrial ectopic beats remains a cornerstone for the treatment of atrial arrhythmias. The lack of accurate tools to guide electrophysiologists leads to an increase in the recurrence rate of ablation procedures. Existing approaches are based on the analysis of the P-waves main characteristics and the forward body surface potential maps (BSPMs) or on the inverse estimation of the electric activity of the heart from those BSPMs. These methods have not provided an efficient and systematic tool to localize ectopic triggers...
2017: PloS One
https://www.readbyqxmd.com/read/28700139/oct-layered-tomography-of-the-cornea-provides-new-insights-on-remodeling-after-photorefractive-keratectomy
#18
Rachana S Chandapura, Rohit Shetty, Rushad Shroff, Neha Shilpy, Mathew Francis, Abhijit Sinha Roy
OCT topography of corneal layers was generated to analyze the remodeling of the epithelium and stroma after photorefractive keratectomy (PRK). Myopic PRK was performed in 15 patients. One eye underwent manual scraping of epithelium while the other was treated with Epi clear™. Epi clear allowed a gentler removal of the epithelium compared to manual scraping. Scheimpflug (Pentacam™, OCULUS Optikgerate Gmbh, Germany) and OCT (RTVue™, Optovue Inc., USA) scan of the cornea was performed before and after PRK (3 months)...
July 12, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28695365/influence-of-external-cooling-on-the-femtosecond-laser-ablation-of-dentin
#19
Q T Le, R Vilar, C Bertrand
In the present work, the influence of external cooling on the temperature rise in the tooth pulpal chamber during femtosecond laser ablation was investigated. The influence of the cooling method on the morphology and constitution of the laser-treated surfaces was studied as well. The ablation experiments were performed on dentin specimens using an Yb:KYW chirped-pulse-regenerative amplification laser system (560 fs, 1030 nm). Cavities were created by scanning the specimens at a velocity of 5 mm/s while pulsing the stationary laser beam at 1 kHz and with fluences in the range of 2-14 J/cm(2)...
July 11, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28690711/design-of-a-magnetic-resonance-imaging-guided-magnetically-actuated-steerable-catheter
#20
Taoming Liu, Nate Lombard Poirot, Tipakorn Greigarn, M Cenk Çavuşoğlu
This paper presents design optimization of a magnetic resonance imaging (MRI) actuated steerable catheter for atrial fibrillation ablation in the left atrium. The catheter prototype, built over polymer tubing, is embedded with current-carrying electromagnetic coils. The prototype can be deflected to a desired location by controlling the currents passing through the coils. The design objective is to develop a prototype that can successfully accomplish the ablation task. To complete the tasks, the catheter needs to be capable of reaching a set of desired targets selected by a physician on the chamber and keeping a stable contact with the chamber surface...
June 2017: Journal of Medical Devices
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