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Excimer laser

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https://www.readbyqxmd.com/read/29339692/transvenous-extraction-of-a-26-year-old-accufix-atrial-lead-using-tightrail-rotating-dilator-sheath
#1
Anar Mammadli, Veysel Kutay Vurgun, Onur Yıldırım, Ali Timuçin Altın, Başar Candemir, Ömer Akyürek
With the increasing number of implanted pacemakers and implantable cardioverter defibrillators, removal is required more frequently. Presently described is the transvenous extraction of a 26-year-old Accufix atrial lead using a mechanical dilator sheath. A 50-year-old male patient was admitted to the clinic with a pacemaker pocket infection. The atrial lead was an Accufix Bipolar J-Atrial active fixation lead, a model that was recalled in 1994, after reports of 2 deaths and 2 nonfatal injuries related to protrusion of the J retention wire...
January 2018: Türk Kardiyoloji Derneği Arşivi: Türk Kardiyoloji Derneğinin Yayın Organıdır
https://www.readbyqxmd.com/read/29335096/clinically-significant-laser-in%C3%A2-situ-keratomileusis-flap-striae
#2
Avi Wallerstein, Mathieu Gauvin, Eser Adiguzel, Harmanjit Singh, Vasudha Gupta, Mona Harissi-Dagher, Mark Cohen
PURPOSE: To describe the incidence, risk factors, and outcomes before and after irrigation of clinically significant laser in situ keratomileusis (LASIK) flap striae. SETTING: Multisurgeon multicenter standardized protocol practice. DESIGN: Retrospective case-control series. METHODS: Eyes with striae necessitating flap relift and irrigation were identified. Preoperative, intraoperative, and postoperative variables were collected...
December 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29335095/vector-analysis-of-astigmatic-changes-and-optical-quality-outcomes-after-wavefront-guided-laser-in%C3%A2-situ-keratomileusis-using-a-high-resolution-aberrometer
#3
Juan A Durán, Elisa Gutiérrez, Rebeca Atienza, David P Piñero
PURPOSE: To assess the ocular optical quality results as well as the astigmatic changes after wavefront-guided laser in situ keratomileusis (LASIK) in eyes with myopic astigmatism. SETTING: Instituto Clínico-Quirúrgico Oftalmológico, Bilbao, Vizcaya, Spain. DESIGN: Prospective case series. METHODS: Thirty-three eyes having wavefront-guided LASIK with the Star S4IR excimer laser combined with the iDesign system were enrolled in the study...
December 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29332914/long-term-clinical-outcomes-after-treatment-with-excimer-laser-coronary-atherectomy-for-in-stent-restenosis-of-drug-eluting-stent
#4
Eiji Ichimoto, Tadayuki Kadohira, Takashi Nakayama, Joseph De Gregorio
Excimer laser coronary atherectomy (ELCA) has been used for the treatment of complex percutaneous coronary intervention (PCI) such as in-stent restenosis (ISR). However, little information was provided about the clinical outcomes after treatment with ELCA for ISR of drug-eluting stents (DES). This study aimed to investigate the long-term clinical outcomes after PCI with ELCA for ISR of DES.A total of 81 consecutive patients with 87 lesions who underwent PCI for ISR of DES were included. Patients were classified into a PCI with ELCA group (23 patients with 24 lesions) and a PCI without ELCA group (58 patients with 63 lesions)...
January 15, 2018: International Heart Journal
https://www.readbyqxmd.com/read/29328325/comparing-laser-induced-plasmas-formed-in-diode-and-excimer-pumped-alkali-lasers
#5
Aram H Markosyan
Lasing on the D1 transition (62P1/2 → 62S1/2) of cesium can be reached in both diode and excimer pumped alkali lasers. The first uses D2 transition (62S1/2 → 62P3/2) for pumping, whereas the second is pumped by photoexcitation of ground state Cs-Ar collisional pairs and subsequent dissociation of diatomic, electronically-excited CsAr molecules (excimers). Despite lasing on the same D1 transition, differences in pumping schemes enables chemical pathways and characteristic timescales unique for each system...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328106/polymer-thermal-optical-switch-for-a-flexible-photonic-circuit
#6
Yue Sun, Yue Cao, Qi Wang, Yunji Yi, Xiaoqiang Sun, Yuanda Wu, Fei Wang, Daming Zhang
Flexible and wearable optoelectronic devices are the new trend for an active lifestyle. These devices are polymer-based for flexibility. We demonstrated flexible polymer waveguide optical switches for a flexible photonic integrated circuit. The optical switches are composed of a single-mode inverted waveguide with dimensions of 5 μm waveguide width, 3 μm ridge height, and 3 μm slab height. A Mach-Zehnder structure was used in the device, with the Y-branch horizontal length of 0.1 cm, the distance between two heating branches of 30 μm, and the heating branch length of 1 cm...
January 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29315443/pathophysiology-of-corneal-scarring-in-persistent-epithelial-defects-after-prk-and-other-corneal-injuries
#7
Steven E Wilson, Carla S Medeiros, Marcony R Santhiago
PURPOSE: To analyze corneal persistent epithelial defects that occurred at 3 to 4 weeks after -4.50 diopter (D) photorefractive keratectomy (PRK) in rabbits and apply this pathophysiology to the treatment of persistent epithelial defects that occur after any corneal manipulations or diseases. METHODS: Two of 168 corneas that had -4.50 D PRK to study epithelial basement membrane regeneration developed spontaneous persistent epithelial defects that did not heal at 3 weeks after PRK...
January 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29302786/intraoperative-changes-in-corneal-structure-during-excimer-laser-phototherapeutic-keratectomy-ptk-assessed-by-intraoperative-optical-coherence-tomography
#8
Sebastian Siebelmann, Jens Horstmann, Paula Scholz, Björn Bachmann, Mario Matthaei, Manuel Hermann, Claus Cursiefen
PURPOSE: Excimer laser phototherapeutic keratectomy (PTK) is a safe treatment for superficial corneal opacities, e.g., in corneal dystrophies or degenerations. Nevertheless, no standardized treatment protocols are available and intraoperative monitoring was not possible, so far. Here we evaluate the potential benefits of the intraoperative assessment by microscope-integrated intraoperative optical coherence tomography (MI-OCT) of corneal optical properties during PTK. METHODS: Retrospective study of eight patients (one male, seven females; age range, 43-80 years, mean = 66...
January 4, 2018: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29299629/-the-308%C3%A2-nm-excimer-laser-for-the-treatment-of-psoriasis-and-inflammatory-skin-diseases
#9
REVIEW
K Fritz, C Salavastru
Overall, the 308 nm Excimer laser enables not only a more effective and safer UVB therapy than classical UV phototherapy, but also targeted irradiation in higher doses with a lower cumulative load, which results in faster healing of mainly circumscribed skin changes. This also applies to therapy-resistant residual lesions which, despite systemic therapy, did not diminish. Combination therapies usually improve the result and enable the dose of UVB and systemic medication to be reduced. Excimer laser therapy can be used for an increasing number of skin diseases, especially those that respond to phototherapy or photochemotherapy...
January 3, 2018: Der Hautarzt; Zeitschrift Für Dermatologie, Venerologie, und Verwandte Gebiete
https://www.readbyqxmd.com/read/29289206/pulse-stretcher-with-two-beamsplitting-elements-for-excimer-laser-pulses
#10
Qiang Wang, Yanling Han, Cunding Liu, Bincheng Li
A pulse stretcher with two beamsplitting elements and an optical ring cavity is proposed. With a two-beamsplitting-element configuration, the temporal profile of the stretched output pulse is effectively improved, and the transient peak power is significantly reduced. By optimizing the radius of curvature of the concave mirrors used in the ring cavity, the spatial profile of the stretched pulse is kept nearly unchanged. The performance of the pulse stretcher is experimentally investigated with a 193 nm excimer laser...
December 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29285963/femoropopliteal-in-stent-restenosis-gaining-ground-with-excimer-laser-and-drug-coated-balloons
#11
Nicolas W Shammas
No abstract text is available yet for this article.
December 1, 2017: Journal of Endovascular Therapy
https://www.readbyqxmd.com/read/29279546/application-of-fluoridated-hydroxyapatite-thin-film-coatings-using-krf-pulsed-laser-deposition
#12
Yoshiya Hashimoto, Mamoru Ueda, Yu Kohiga, Kazuki Imura, Shigeki Hontsu
Fluoridated hydroxyapatite (FHA) was investigated for application as an implant coating for titanium bone substitute materials in dental implants. A KrF pulsed excimer deposition technique was used for film preparation on a titanium plate. The compacts were ablated by laser irradiation at an energy density of 1 J/cm2 on an area 1×1 mm2 with the substrate at room temparature. Energydispersive spectrometric analysis of the FHA film revealed peaks of fluorine in addition to calcium and phosphorus. X-ray diffraction revealed the presence of crystalline FHA on the FHA film after a 10 h post annealing treatment at 450°C...
December 27, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29250710/a-review-of-monochromatic-light-devices-for-the-treatment-of-alopecia-areata
#13
REVIEW
Evan Darwin, Harleen Arora, Penelope A Hirt, Tongyu Cao Wikramanayake, Joaquin J Jimenez
There are many laser technologies that are being tested that claim to support hair regrowth for patients with alopecia areata (AA). In this paper, we will determine whether the body of evidence supports the use of devices using monochromatic light sources to treat AA. Articles were gathered from PubMed, Embase, and the Cochrane database using these keywords: lasers, excimer laser, low-level laser therapy (LLLT), low-level light therapy, alopecia, alopecia areata, and hair loss with a category modifier of English...
December 17, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29238735/post-keratoplasty-astigmatism-management-by-relaxing-incisions-a-systematic-review
#14
REVIEW
Gaëlle Ho Wang Yin, Louis Hoffart
Postoperative visual acuity can be limited by post-keratoplasty astigmatism, even with a clear corneal graft. Astigmatism management can be performed by selective suture removal, adjustment of sutures, optical correction, photorefractive procedures, wedge resection, intra-ocular lens implantation, intracorneal ring segments, relaxing incisions with or without compression sutures and repeated keratoplasty. Relaxing incisions can be made in the graft, graft-host interface or host cornea. Despite the unpredictability of the method because the flat and steep meridians are usually not orthogonal after penetrating keratoplasty, with asymmetric power distribution, all the studies showed an overall reduction of refractive, keratometric or topographic astigmatism, ranging from 30% to 72% with manual or femtosecond-assisted techniques...
2017: Eye and Vision (London, England)
https://www.readbyqxmd.com/read/29231940/femtosecond-excited-state-dynamics-of-fullerene-c60-nanoparticles-in-water
#15
Yukihide Ishibashi, Miya Arinishi, Tetsuro Katayama, Hiroshi Miyasaka, Tsuyoshi Asahi
Femtosecond excited-state dynamics of fullerene-C60 nanoparticles (nC60) having a mean size of 50 nm dispersed in pure water was studied by means of femtosecond transient absorption spectroscopy. The intermolecular charge-transfer (CT) excited state in solid C60 was directly and firstly observed by femtosecond 350 nm and 420 nm excitations, and its intrinsic lifetime of 0.35 ps was found. The CT excited state relaxed to the locally excited S1 state and excimers or directly to the ground state through geminate charge recombination...
December 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29227515/a-novel-corneal-remodeling-technique-for-the-management-of-keratoconus
#16
Cesar Carriazo, Maria Jose Cosentino
PURPOSE: To describe a novel technique to reshape the ectatic cornea by means of crescent keratectomy performed with an excimer laser using a mask. METHODS: A crescent-shaped perforation at the base of the mask allowed the laser ablation to be directed only to the intended region, shielding the remaining cornea. This technique was performed in 3 eyes of 3 patients with keratoconus grade 2 to 3. Arcs of 180° and 360° had been performed depending on the severity of the keratoconus...
December 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29223234/corneal-remodeling-after-implantation-of-a-shape-changing-inlay-concurrent-with-myopic-or-hyperopic-laser-in%C3%A2-situ-keratomileusis
#17
Roger F Steinert, Douglas D Koch, Beatrice Cochener, Alan Lang, Enrique Barragán-Garza, Arturo Chayet, Luis G Vargas
PURPOSE: To compare the induced addition (add)-power profile and epithelial remodeling between patients receiving hyperopic and myopic laser in situ keratomileusis (LASIK) concurrently with implantation of a corneal shape-changing inlay. SETTING: Specialty clinics in Monterrey and Tijuana, Mexico. DESIGN: Retrospective case series. METHODS: Preoperative hyperopic patients (mean spherical equivalent [SE] treatment +1...
November 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29214983/insight-on-agglomerates-of-gold-nanoparticles-in-glass-based-on-surface-plasmon-resonance-spectrum-study-by-multi-spheres-t%C3%A2-matrix-method
#18
Leon Avakyan, Maximilian Heinz, Anna Skidanenko, Kirill A Yablunovskiy, Jürgen Ihlemann, Jörg Meinertz, Christian Patzig, Manfred Dubiel, Lusegen Bugaev
Formation of localized surface plasmon resonance (SPR) spectrum of the randomly distributed gold nanoparticles in the surface layer of silicate float glass, generated and implanted by UV ArF-excimer laser irradiation of thin gold layer sputter coated on the glass surface, was studied by the T-matrix method, which enables taking into account particles agglomerates. The used experimental technique is promising to produce submicron patterns of plasmonic nanoparticles (given by laser masks or gratings) without damaging of the glass surface...
December 7, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29167808/small-incision-lenticule-extraction-smile-in-the-correction-of-myopic-astigmatism-outcomes-and-limitations-an-update
#19
REVIEW
Jorge L Alió Del Barrio, Verónica Vargas, Olena Al-Shymali, Jorge L Alió
Small Incision Lenticule Extraction (SMILE) is a flap-free intrastromal technique for the correction of myopia and myopic astigmatism. To date, this technique lacks automated centration and cyclotorsion control, so several concerns have been raised regarding its capability to correct moderate or high levels of astigmatism. The objective of this paper is to review the reported SMILE outcomes for the correction of myopic astigmatism associated with a cylinder over 0.75 D, and its comparison with the outcomes reported with the excimer laser-based corneal refractive surgery techniques...
2017: Eye and Vision (London, England)
https://www.readbyqxmd.com/read/29134403/femtosecond-lenticule-extraction-performed-on-a-wrong-meridian-and-effectively-reversed-by-excimer-laser-ablation
#20
Alper Agca, Yusuf Yildirim, Burçin Kepez Yildiz, Dilek Yasa, Ali Demircan, Ahmet Demirok
No abstract text is available yet for this article.
November 13, 2017: Lasers in Medical Science
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