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https://www.readbyqxmd.com/read/28449323/in-vitro-comparison-of-renal-stone-laser-treatment-using-fragmentation-and-popcorn-technique
#1
Paul Klaver, Tjeerd de Boorder, Alex I Rem, Tycho M T W Lock, Herke Jan Noordmans
OBJECTIVE: To study the effectiveness of two laser techniques clinically used to fragment renal stones: fragmenting technique (FT) and popcorn technique (PT). METHODS: Phantom stones were placed in a test tube filled with water, mimicking a renal calyx model. A Holmium:YAG laser was used for fragmentation using both techniques. Four series of experiments were performed with two parameters: the technique (FT or PT) and the number of stones in the test tube (one or four)...
April 27, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28442384/the-optimal-settings-for-non-contact-holmium-yag-stone-fragmentation-pop-corn-technique
#2
Esteban Emiliani, Michele Talso, Sung-Yong Cho, Mohammed Baghdadi, Sadam Ghanem, Hugo Pinheiro, Olivier Traxer
PURPOSE: The purpose of this study was to evaluate the "pop-corn" technique with a wide range of holmium laser settings and fiber sizes in a systematic in-vitro assessment. MATERIALS AND METHODS: The evaluations were done with 4 artificial stones in a Vacutaner. A fixed ureteroscope was inserted through a ureteral access sheath providing constant irrigation flow and the laser was placed 1 mm from the bottom. Combinations of 0.5-1.5 Joules, 10-20 and 40Hz, and long and short pulses were tested for 2 and 4 minutes...
April 22, 2017: Journal of Urology
https://www.readbyqxmd.com/read/28437959/high-average-power-2-%C3%AE-m-femtosecond-optical-parametric-oscillator-synchronously-pumped-by-a-thin-disk-mode-locked-laser
#3
T Petersen, J D Zuegel, J Bromage
A high-energy, extended-cavity femtosecond BiBO optical parametric oscillator synchronously pumped by a 1.0-ps, 1030-nm Yb:YAG, thin-disk pump laser is presented. The oscillator operated near degeneracy in a noncollinear interaction geometry, producing signal wavelength tunability from 1.99 to 2.20 μm. The signal pulses have an average power exceeding 2 W, producing 455-fs pulses at 7.08 MHz with energies up to 350 nJ, showing increased potential for tunable sources of scalable ultrafast pulses in the infrared...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28432681/retrospective-single-center-study-of-the-efficacy-of-large-spot-532%C3%A2-nm-laser-for-the-treatment-of-facial-capillary-malformations-in-44-patients-with-the-use-of-three-dimensional-image-analysis
#4
Bartłomiej Kwiek, Michał Rożalski, Cezary Kowalewski, Marcin Ambroziak
OBJECTIVE: We wanted to asses the efficacy of large spot 532 nm laser for the treatment of facial capillary malformations with the use of three-dimensional (3D) image analysis. STUDY DESIGN AND METHODS: Retrospective single center study on previously non-treated patients with facial capillary malformations (CM) was performed. A total of 44 consecutive Caucasian patients aged 5-66 were included. Patients had 3D photography performed before and after and had at least one single session of treatment with 532 nm neodymium-doped yttrium aluminum garnet (Nd:YAG) laser with contact cooling, fluencies ranging from 8 to 11...
April 22, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28430245/operation-of-ho-yag-ultrafast-laser-inscribed-waveguide-lasers
#5
Sean McDaniel, Fiona Thorburn, Adam Lancaster, Ronald Stites, Gary Cook, Ajoy Kar
We report fabrication and operation of multi-watt level waveguide lasers utilizing holmium-doped yttrium aluminum garnet (Ho:YAG). The waveguides were fabricated using ultrafast laser inscription, which relies on a chirped pulse ytterbium fiber laser to create depressed cladding structures inside the material. A variety of waveguides were created inside the Ho:YAG samples. We demonstrate output powers of ∼2  W from both a single-mode 50 μm waveguide laser and a multimode 80 μm waveguide laser. In addition, laser action from a co-doped Yb:Ho:YAG sample under in-band pumping conditions was demonstrated...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28430211/compact-high-power-high-beam-quality-quasi-cw-microsecond-five-pass-zigzag-slab-1319%C3%A2-%C3%A2-nm-amplifier
#6
Chuan Guo, Junwei Zuo, Qi Bian, Chang Xu, Qinshuang Zong, Yong Bo, Yu Shen, Nan Zong, Hongwei Gao, Yanyong Lin, Lei Yuan, Yang Liu, Dafu Cui, Qinjun Peng, Zuyan Xu
We demonstrate a compact, high-power, quasi-continuous-wave (QCW) end-pumped 1319 nm Nd:YAG slab amplifier laser with good beam quality. The laser is based on a QCW pulse Nd:YAG master oscillator and Nd:YAG slab amplifier with multi-pass zigzag architecture. The amplifier operates at a pulse repetition frequency of 500 Hz and pulse width of ∼105  μs, delivering a maximum output power of 51.5 W under absorbed pump power of 217.8 W and corresponding to an extraction efficiency of 14.2%. The beam quality factor is measured to be Mx2=1...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28428923/the-long-term-outcome-of-the-management-of-the-posterior-capsule-in-pseudophakic-children
#7
Malcolm R Ing
This is a long term study of the treatment of the posterior lens capsule in the management of bilateral cataract extraction and insertion of 42 intraocular lenses in 21 children. The purpose of the current study was to compare the long-term outcome of eyes treated by the two different methods of surgery of the posterior lens capsule in bilateral cataract and intraocular lens implantation in children. The author performed an independent ocular exam on the children selected from a consecutive series at 4 different institutions, followed for a minimum of 5 years...
April 2017: Hawai'i Journal of Medicine & Public Health: a Journal of Asia Pacific Medicine & Public Health
https://www.readbyqxmd.com/read/28428827/fundamental-research-on-the-action-mechanism-of-the-800-nm-semiconductor-laser-on-skin-blackheads-and-coarse-pores
#8
Jie Lin, Li Jing, Hao Zhu, Fu-Sheng Dong
The aim of the study was to determine the mechanism of action of the 800 nm semiconductor laser on skin blackheads and coarse pores. A total of 24 healthy purebred short-haired male guinea pigs, weighing 350-400 g, were selected and smeared with 0.5 ml coal tar suspension evenly by injector once daily. Treatment was continued for 14 days to form an experimental area of 8×3 cm on the back of the guinea pigs. The animals were divided into the following groups: Normal control group (NC), low-dose laser treatment group (L-LS), high-dose laser treatment group (H-LS), and Q-switched Nd:YAG treatment group (QC)...
January 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28426336/effect-of-laser-energy-and-tip-insertion-depth-on-the-pressure-generated-outside-the-apical-foramen-during-er-yag-laser-activated-root-canal-irrigation
#9
Kanako Yao, Kazuhisa Satake, Satoshi Watanabe, Arata Ebihara, Chihiro Kobayashi, Takashi Okiji
OBJECTIVE: The risk of extrusion of irritative irrigants into the extraradicular tissue should be minimized during root canal irrigation. This study aimed to examine the pressure generated outside the apex during Er:YAG laser-activated irrigation (LAI) in comparison with passive ultrasonic irrigation (PUI) and conventional syringe irrigation (SI). BACKGROUND DATA: LAI is reported to be efficient for root canal debridement, whereas the apical pressure generated during LAI has not been investigated in detail...
April 20, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28426292/efficacy-of-three-different-lasers-on-eradication-of-enterococcus-faecalis-and-candida-albicans-biofilms-in-root-canal-system
#10
Silvija Kasić, Marita Knezović, Nataša Beader, Dragana Gabrić, Ana Ivanišević Malčić, Anja Baraba
OBJECTIVE: The objective was to compare the efficacy of three different lasers in disinfection of root canals inoculated with Enterococcus faecalis and Candida albicans biofilms. BACKGROUND: Endodontic space disinfection depends on the type of root canal irrigant used and the way it is delivered and agitated because irrigants have limited ability to reach all parts of root canal system. MATERIALS AND METHODS: Thirty single-rooted human teeth were selected...
April 20, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28424926/erratum-to-co2-erbium-yag-dye-laser-combination-an-effective-and-successful-treatment-for-angiofibromas-in-tuberous-sclerosis
#11
Paolo Fioramonti, Liliana De Santo, Martina Ruggieri, Sara Carella, Federico Lo Torto, Maria Giuseppina Onesti, Nicolò Scuderi
No abstract text is available yet for this article.
April 19, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28422595/microleakage-of-sealants-after-phosphoric-acid-er-yag-laser-and-air-abrasion-enamel-conditioning-systematic-review-and-meta-analysis
#12
Ana Caroline Fumes, Daniele Lucca Longo, Andiara De Rossi, Tatiana Kelly da Silva Fidalgo, Francisco Wanderley Garcia de Paula E Silva, Maria Cristina Borsatto, Erika Calvano Küchler
PURPOSE: The aim of this systematic review and meta-analysis is to answer the focused question: Does the application of phosphoric acid, Er:YAG laser and air abrasion enamel conditioning methods previous to the oclusal sealant application in human permanent molars influence the microleakage? STUDY DESIGN: A literature research was carried out in the Pubmed Medline, Web of Science, Scopus and Cochrane databases using with the MeSH terms and keyword search strategy...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28418076/ultrasonic-modulation-of-tissue-optical-properties-in-ex-vivo-porcine-skin-to-improve-transmitted-transdermal-laser-intensity
#13
Paul J D Whiteside, Chenxi Qian, Nicholas Golda, Heather K Hunt
BACKGROUND AND OBJECTIVE: Applications of light-based energy devices involving optical targets within the dermis frequently experience negative side-effects resultant from surface scattering and excess optical absorption by epidermal melanin. As a broadband optical absorber, melanin decreases the efficacy of light-based treatments throughout the ultraviolet, visible, and near-infrared spectra while also generating additional heat within the surface tissue that can lead to inflammation or tissue damage...
April 18, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28414351/phase-matching-properties-of-baga-sub-4-sub-se-sub-7-sub-for-shg-and-sfg-in-the-0-901-10-5910%C3%A2-%C3%A2-%C3%AE-m-range
#14
Kiyoshi Kato, Kentaro Miyata, Valentin Petrov
We report new experimental results on the phase-matching properties of a BaGa<sub>4</sub>Se<sub>7</sub> crystal for harmonic generation of a Nd:YAG laser-pumped AgGaS<sub>2</sub> optical parametric oscillator (OPO) and a CO<sub>2</sub> laser in the 0.901-10.5910 μm range. In addition, we present new Sellmeier equations that provide a good reproduction of the present experimental results as well as the published data points for a Nd:YAG laser-pumped OPO and an optical parametric amplifier (OPA) in the 3...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28414343/effect-of-hydrocarbon-molecular-decomposition-on-palladium-assisted-laser-induced-plasma-ablation
#15
Alireza Moosakhani, Parviz Parvin, Seyedeh Zahra Mortazavi, Ali Reyhani, Shariar Abachi
The Q-switched Nd:YAG laser is focused on a palladium target in the control chamber filled with various hydrocarbon atmospheres (C1-C4) to investigate their effect on the palladium ablated mass, gas reaction products, and corresponding plasma parameters (such as electron density N<sub>e</sub> and plasma temperature T<sub>e</sub>) during molecular decomposition. The plasma parameters arise mainly from the Pd nanocatalytic activity during the laser-induced plasma process. We compare synthetic air atmosphere to hydrocarbon media to understand how the latter generates excess heat via oxygen-free exothermic (recombination) reactions...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28409778/linewidth-enhancement-factor-measurement-based-on-fm-modulated-optical-injection-application-to-rare-earth-doped-active-medium
#16
Aurélien Thorette, Marco Romanelli, Marc Vallet
A new method for measuring the linewidth enhancement factor of a laser is proposed. It is based on frequency-modulated optical injection, combined with dual-frequency laser operation. The linewidth enhancement factor α is deduced from the experimental data using a theoretical analysis based on a standard rate equation model. As the intracavity power is kept constant, the method frees the process from the thermal effects that are usually present in AM/FM techniques. Measurement of α=0.28±0.04 in a diode-pumped Nd:YAG laser demonstrates that the method is well-suited for characterizing small values of α...
April 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28405537/vascular-air-embolism-during-bronchoscopy-procedures-incidence-pathophysiology-diagnosis-management-and-outcomes
#17
REVIEW
Venkatkiran Kanchustambham, Swetha Saladi, Kris Mehta, John Mwangi, Zafar Jamkhana, Setu Patolia
Vascular air embolism (VAE) is a rare, but potentially fatal complication of invasive medical or surgical procedures. It is a very rare complication of bronchoscopy and is most frequently reported with therapeutic bronchoscopy with Argon plasma coagulation (APC) or neodymium-doped yttrium aluminum garnet (Nd-YAG) laser. Despite being rare, as a result of its high chance of mortality and morbidity, it is imperative that physicians have high clinical suspicion to allow for early recognition and treatment. In this article, we provide a concise review of the incidence, pathophysiology, diagnosis management and outcomes of air embolism during bronchoscopy procedures...
March 9, 2017: Curēus
https://www.readbyqxmd.com/read/28401347/calculus-migration-characterization-during-ho-yag-laser-lithotripsy-by-high-speed-camera-using-suspended-pendulum-method
#18
Jian James Zhang, Danop Rajabhandharaks, Jason Rongwei Xuan, Ray W J Chia, Thomas Hasenberg
Calculus migration is a common problem during ureteroscopic laser lithotripsy procedure to treat urolithiasis. A conventional experimental method to characterize calculus migration utilized a hosting container (e.g., a "V" grove or a test tube). These methods, however, demonstrated large variation and poor detectability, possibly attributed to the friction between the calculus and the container on which the calculus was situated. In this study, calculus migration was investigated using a pendulum model suspended underwater to eliminate the aforementioned friction...
April 12, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28394958/-electrocautery-and-bronchoscopy-as-a-first-step-for-the-management-of-central-airway-obstruction-and-associated-hemoptysis
#19
Alfredo Jalilie, Juan Carlos Carvajal, Rodrigo Aparicio, Manuel Meneses
BACKGROUND: Central airway obstruction caused by malignant or benign lesions, associated in some cases with hemoptysis, is a condition with high morbidity and mortality. The use of electrocautery by flexible bronchoscopy is an initial treatment option with immediate improvement of obstruction symptoms. It is as effective as Nd: YAG laser. AIM: To describe the usefulness of electrocautery in the management of central obstruction of the airway and hemoptysis. MATERIAL AND METHODS: A retrospective, descriptive study of patients referred for management of central airway obstruction or associated hemoptysis...
November 2016: Revista Médica de Chile
https://www.readbyqxmd.com/read/28394665/comparison-of-q-switched-nd-yag-laser-alone-versus-its-combination-with-ultra-pulse-co2-laser-for-the-treatment-of-black-tattoo
#20
Mithila Vanarase, Ram Krishan Gautam, Pooja Arora, Sonali Bajaj, Neha Meena, Ananta Khurana
BACKGROUND: Q-switched lasers are conventionally used for the treatment of black tattoo. However they require multiple sittings and the response may be slow due to competing epidermal pigment in dark skin. OBJECTIVE: To compare the efficacy of Q Switched Nd:YAG laser alone with its combination with ultrapulse CO2 in black tattoo removal. MATERIALS AND METHODS: Sixty patients of black tattoo were randomized into two groups. Group A was treated with QS Nd:YAG laser (1064 nm) alone and group B received combination of ablative ultrapulse CO2 followed by fixed dose QS Nd:YAG laser (1064 nm), at 6 weeks interval for a maximum of 6 sittings...
April 10, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
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