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Excimer laser

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https://www.readbyqxmd.com/read/29769164/the-effectiveness-of-excimer-laser-angioplasty-to-treat-coronary-in-stent-restenosis-with-peri-stent-calcium-as-assessed-by-optical-coherence-tomography
#1
Tetsumin Lee, Richard A Shlofmitz, Lei Song, Theofanis Tsiamtsiouris, Thomas Pappas, Antonio Madrid, Allen Jeremias, Elizabeth S Haag, Ziad A Ali, Jeffery W Moses, Mitsuaki Matsumura, Gary S Mintz, Akiko Maehara
AIMS: We evaluated the effectiveness of excimer laser coronary angioplasty (ELCA) to treat in-stent restenosis (ISR) due to peri-stent calcium-related stent under-expansion as assessed by optical coherence tomography (OCT). METHODS AND RESULTS: We studied 81 patients (81 lesions with ISR, stent under-expansion, and peri-stent calcium >90°) who underwent OCT imaging both pre- and post-percutaneous coronary intervention and compared lesions treated with ELCA (n=23) vs without ELCA (n=58)...
May 15, 2018: EuroIntervention
https://www.readbyqxmd.com/read/29762579/surface-plasmon-resonance-sensing-in-gaseous-media-with-optical-fiber-gratings
#2
Álvaro González-Vila, Andreas Ioannou, Médéric Loyez, Marc Debliquy, Driss Lahem, Christophe Caucheteur
Surface plasmon resonance excitation with optical fiber gratings has been typically studied in aqueous solutions. This work describes the procedure to excite a plasmon wave in gaseous media and perform refractive index measurements in these environments. Grating photo-inscription with 193 nm excimer laser radiation allows us to obtain slightly tilted fiber Bragg gratings exhibiting a cladding mode resonance comb along several hundreds of nanometers. Their refractive index sensitive range extends from gases to liquids, so operation in both media is compared...
May 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29738585/circle-enhancement-after-myopic-smile
#3
Jakob Siedlecki, Nikolaus Luft, Wolfgang J Mayer, Martin Siedlecki, Daniel Kook, Bertram Meyer, Martin Bechmann, Rainer Wiltfang, Siegfried G Priglinger, Martin Dirisamer
PURPOSE: To report the outcomes of enhancement after small incision lenticule extraction (SMILE) using the VisuMax CIRCLE option (Carl Zeiss Meditec AG, Jena, Germany), which converts the SMILE cap into a femtosecond LASIK flap for secondary excimer laser application. METHODS: Of 2,065 SMILE procedures, 22 eyes (1.1%) re-treated with CIRCLE with a follow-up of 3 months were included in the analysis. SMILE was performed in the usual manner. For re-treatment, the CIRCLE procedure was performed with pattern D flap creation on the VisuMax system and subsequent excimer laser ablation with a Zeiss MEL 90 laser (Carl Zeiss Meditec) with plano target in all cases...
May 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29734734/investigating-the-strain-temperature-and-humidity-sensitivity-of-a-multimode-graded-index-perfluorinated-polymer-optical-fiber-with-bragg-grating
#4
Yulong Zheng, Kort Bremer, Bernhard Roth
In this work we investigate the strain, temperature and humidity sensitivity of a Fiber Bragg Grating (FBG) inscribed in a near infrared low-loss multimode perfluorinated polymer optical fiber based on cyclic transparent optical polymer (CYTOP). For this purpose, FBGs were inscribed into the multimode CYTOP fiber with a core diameter of 50 µm by using a krypton fluoride (KrF) excimer laser and the phase mask method. The evolution of the reflection spectrum of the FBG detected with a multimode interrogation technique revealed a single reflection peak with a full width at half maximum (FHWM) bandwidth of about 9 nm...
May 5, 2018: Sensors
https://www.readbyqxmd.com/read/29708931/recent-advances-in-wavefront-guided-lasik
#5
Edward Manche, Joshua Roe
PURPOSE OF REVIEW: Laser vision correction remains an active area of research, and there have been many recent advances in the field. The purpose of this review is to provide an update on the recent advances for one of the most common methods of laser vision correction, wavefront-guided laser in-situ keratomileusis (LASIK). RECENT FINDINGS: Recent technological advancements in wavefront aberrometry are largely responsible for the improved visual outcomes that have been recently reported...
April 27, 2018: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/29705008/repeatability-of-automatic-measurements-by-a-new-anterior-segment-optical-coherence-tomographer-combined-with-placido-topography-and-agreement-with-2-scheimpflug-cameras
#6
Giacomo Savini, Domenico Schiano-Lomoriello, Kenneth J Hoffer
PURPOSE: To evaluate the repeatability of automatic measurements by a new anterior segment optical coherence tomographer (AS-OCT) combined with Placido topography and their agreement with those provided by 2 rotating Scheimpflug cameras. SETTING: G.B. Bietti Foundation IRCCS, Rome, Italy. DESIGN: Evaluation of a diagnostic test instrument. METHODS: Unoperated eyes and eyes with previous myopic excimer laser surgery were analyzed...
April 25, 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29702600/long-period-gratings-in-highly-germanium-doped-single-mode-optical-fibers-for-sensing-applications
#7
Sebastian Schlangen, Kort Bremer, Yulong Zheng, Sebastian Böhm, Michael Steinke, Felix Wellmann, Jörg Neumann, Bernhard Roth, Ludger Overmeyer
Long-period fiber gratings (LPGs) are well known for their sensitivity to external influences, which make them interesting for a large number of sensing applications. For these applications, fibers with a high numerical aperture (i.e., fibers with highly germanium (Ge)-doped fused silica fiber cores) are more attractive since they are intrinsically photosensitive, as well as less sensitive to bend- and microbend-induced light attenuations. In this work, we introduce a novel method to inscribe LPGs into highly Ge-doped, single-mode fibers...
April 27, 2018: Sensors
https://www.readbyqxmd.com/read/29679477/generation-of-8-oxo-7-8-dihydroguanine-in-g-quadruplexes-models-of-human-telomer-sequences-by-one-electron-oxidation
#8
Tomasz J Merta, Nicholas E Geacintov, Vladimir Shafirovich
The mechanistic aspects of one-electron oxidation of G-quadruplexes in the basket (Na+ ions) and hybrid (K+ ions) conformations were investigated by transient absorption laser kinetic spectroscopy and HPLC detection of the 8-oxo-7,8-dihydroguanine (8-oxoG) oxidation product. The photo-induced one-electron abstraction from G-quadruplexes was initiated by sulfate radical anions (SO4 •- ) derived from the photolysis of persulfate ions by 308 nm excimer laser pulses. In neutral aqueous solutions (pH 7.0), the transient absorbance of neutral guanine radicals, G(-H)• is observed following the complete decay of SO4 •- radicals (~10 μs after the actinic laser flash)...
April 21, 2018: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29677788/angle-dependent-3-d-directional-patterning-of-flexible-films-by-infrared-laser
#9
Jinhwan Kim, Jae-Hoon Ji, Gae-Hun Jo, Sung-Wook Min, Jung-Hyuk Koh
Laser direct patterning (LDP) technology has attracted great attention due to its process simplification and environmental friendliness. It is replacing the existing photo-lithography technology. Infrared (IR) laser equipment also has advantages such as low cost and long duration, although it is difficult to implement fine line width compared to ultraviolet (UV) or excimer laser. Therefore, it is very important to realize 3-D patterning system based on cheap infrared laser system. In this paper, 3-D infrared laser direct patterning system was designed by introducing an etching process on Ag paste/ITO/PET flexible film...
September 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29675388/consistent-comparison-of-angle-kappa-adjustment-between-oculyzer-and-topolyzer-vario-topography-guided-lasik-for-myopia-by-ex500-excimer-laser
#10
Ming-Shen Sun, Li Zhang, Ning Guo, Yan-Zheng Song, Feng-Ju Zhang
AIM: To evaluate and compare the uniformity of angle Kappa adjustment between Oculyzer and Topolyzer Vario topography guided ablation of laser in situ keratomileusis (LASIK) by EX500 excimer laser for myopia. METHODS: Totally 145 cases (290 consecutive eyes )with myopia received LASIK with a target of emmetropia. The ablation for 86 cases (172 eyes) was guided manually based on Oculyzer topography (study group), while the ablation for 59 cases (118 eyes) was guided automatically by Topolyzer Vario topography (control group)...
2018: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/29675379/photorefractive-keratectomy-after-cataract-surgery-in-uncommon-cases-long-term-results
#11
Anna Maria Roszkowska, Mario Urso, Giuseppe Alberto Signorino, Leopoldo Spadea, Pasquale Aragona
AIM: To evaluate the efficacy and safety of the excimer laser correction of the residual refractive errors after cataract extraction with intraocular lens (IOL) implantation in uncommon cases. METHODS: Totally 24 patients with high residual refractive error after cataract surgery with IOL implantation were examined. Twenty-two patients had a history of phacoemulsification and IOL implantation, and two had extra-capsular cataract extraction with IOL implantation...
2018: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/29621929/laser-synthesized-nanocrystalline-ferroelectric-bioactive-batio-3-pt-fs-for-bone-implants
#12
Miroslav Jelínek, Elena Buixaderas, Jan Drahokoupil, Tomáš Kocourek, Jan Remsa, Přemysl Vaněk, Marta Vandrovcová, Martina Doubková, Lucie Bačáková
The goal of our study is to design BaTiO3 ferroelectric layers that will cover metal implants and provide improved osseointegration. We synthesized ferroelectric BaTiO3 layers on Pt/fused silica substrates, and we studied their physical and bio-properties. BaTiO3 and Pt layers were prepared using KrF excimer laser ablation at substrate temperature Ts in the range from 200°C to 750°C in vacuum or under oxygen pressure of 10 Pa, 15 Pa, and 20 Pa. The BaTiO3 /Pt and Pt layers adhered well to the substrates. BaTiO3 films of crystallite size 60-140 nm were fabricated...
January 1, 2018: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/29617993/navigation-of-lead-extraction-is-it-possible-impact-of-preprocedural-electrocardiogram-triggered-computed-tomography-on-navigation-of-lead-extraction
#13
Julia Vogler, Simon Pecha, Ryan Azarrafiy, Liesa Castro, Florian Deuschl, Clemens Spink, Matthias Linder, Ulrike von Hehn, Stephan Willems, Hermann Reichenspurner, Nils Gosau, Samer Hakmi
OBJECTIVES: As the number of transvenous lead extractions continues to increase, preprocedural protocols for this procedure must be assessed. The objective of this study was to determine whether an electrocardiogram (ECG)-triggered computed tomography (Et-CT) with three-dimensional (3D) reconstructions could aid lead extractors in choosing the optimal tools to improve procedural success and avoid complications. METHODS: In this study, 31 patients scheduled for transvenous lead extraction underwent a preprocedural Et-CT between January 2016 and May 2017...
March 30, 2018: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/29610024/topography-guided-transepithelial-photorefractive-keratectomy-to-correct-irregular-refractive-errors-after-radial-keratotomy
#14
Mohammad Ghoreishi, Alireza Peyman, Nima Koosha, Khodayar Golabchi, Mohsen Pourazizi
PURPOSE: To evaluate the efficacy and safety of topography-guided transepithelial photorefractive keratectomy (PRK) in a group of patients with post-radial keratotomy (RK) showing irregular corneas. SETTING: Feiz University Hospital, Isfahan, Iran. DESIGN: Prospective case series. METHODS: Consecutive patients who had irregular astigmatism after RK with stable refraction and topography for at least 1 year were recruited...
March 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29581746/utility-of-dermoscopy-for-evaluating-the-therapeutic-efficacy-of-tacrolimus-ointment-plus-308-nm-excimer-laser-combination-therapy-in-localized-vitiligo-patients
#15
Lu-Mei Wang, Wan-Jiao Lu, Jing-Tao Yuan, Bi-Bing Zeng, Dan Li, Feng Zhang, Jun-Jie Li
The aim of the present study was to assess the function of dermoscopy in evaluating the therapeutic efficacy of tacrolimus ointment plus 308-nm excimer laser combination therapy in patients with localized vitiligo. A total of 147 patients with localized vitiligo (progressive disease, n=92; stable period, n=55) were enrolled and received combination therapy for 12 weeks. The condition of the skin lesions was monitored by dermoscopy and visual observation. At the initial visit, skin lesions were observed in 61 progressive and 19 stable patients...
April 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29575296/modifications-generated-by-fast-photochemical-oxidation-of-proteins-reflect-the-native-conformations-of-proteins
#16
Emily E Chea, Lisa M Jones
Hydroxyl radical footprinting (HRF) is a nonspecific protein footprinting method that has been increasingly used in recent years to analyze protein structure. The method oxidatively modifies solvent accessible sites in proteins, which changes upon alterations in the protein such as ligand binding or a change in conformation. For HRF to provide accurate structural information, the method must probe the native structure of proteins. This requires careful experimental controls since an abundance of oxidative modifications can induce protein unfolding...
March 25, 2018: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/29574089/trends-in-phototherapy-utilization-among-medicare-beneficiaries-in-the-united-states-2000-2015
#17
Sally Tan, Elizabeth Buzney, Arash Mostaghimi
BACKGROUND: Phototherapy is a cost-effective treatment for many dermatoses, yet emerging alternative therapies such as biologics led many to think that phototherapy utilization was declining. OBJECTIVE: To characterize national, historical phototherapy utilization and costs among Medicare beneficiaries. METHODS: Longitudinal analysis of Medicare Part B National Summary Data File from 2000-2015 for phototherapy billing codes. Geographic distribution of clinics and provider type obtained from Medicare Provider Utilization and Payment Data for 2012-2015...
March 21, 2018: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/29543185/contemporary-use-of-laser-during-percutaneous-coronary-interventions-insights-from-the-laser-veterans-affairs-lava-multicenter-registry
#18
Judit Karacsonyi, Ehrin J Armstrong, Huu Tam D Truong, Ryan Tsuda, Damianos G Kokkinidis, Jose Roberto Martinez-Parachini, Aya J Alame, Barbara A Danek, Aris Karatasakis, Michele Roesle, Houman Khalili, Imre Ungi, Subhash Banerjee, Emmanouil S Brilakis, Bavana V Rangan
BACKGROUND: The contemporary use and outcomes of excimer laser coronary atherectomy (ELCA) in percutaneous coronary intervention (PCI) are not well described. METHODS: We examined the baseline clinical and angiographic characteristics and procedural outcomes of 130 target lesions in 121 consecutive PCIs (n = 116 patients) in which ELCA was performed at three United States Department of Veterans Affairs (VA) medical centers between 2008 and 2016. RESULTS: Mean age was 68...
March 15, 2018: Journal of Invasive Cardiology
https://www.readbyqxmd.com/read/29521479/robotically-performed-excimer-laser-coronary-atherectomy-proof-of-feasibility
#19
Abdullah Almasoud, Daniel Walters, Ehtisham Mahmud
The feasibility, safety, and high technical success of robotically assisted percutaneous coronary intervention (PCI) for the treatment of both simple and complex coronary disease has been demonstrated. As the current generation robotic platform is limited to a rapid exchange system, orbital or rotational atherectomy cannot be performed robotically. However, excimer laser coronary atherectomy is performed with a rapid exchange catheter but its feasibility during robotically assisted PCI is unknown. We report the successful use of laser atherectomy during two complex robotically assisted PCI procedures using the CorPath GRX robotic system...
March 9, 2018: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/29516199/keratoconus-like-tomographic-changes-in-a-case-of-recurrent-interstitial-keratitis
#20
Marie-Sophie Hanet, Annette Zimpfer, Sabine Lepper, Berthold Seitz
BACKGROUND: The purpose of this report was to describe a single case of recurrent interstitial keratitis in a young patient leading to keratoconus-like corneal changes. RESULTS: Over the 2 years follow-up, the patient developed clinical signs of keratoconus with Vogt's striae, Fleischer Ring and paracentral stromal thinning in the affected eye only. The tomographic measurements revealed a rapid reduction of corneal thickness from 581 to 303 μm and an irregular steepening of the pathological cornea...
March 7, 2018: Journal of Ophthalmic Inflammation and Infection
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