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CO2 laser

Markus M Hess, Susanne Fleischer, Marcel Ernstberger
BACKGROUND: Photoangiolytic lasers have broadened the surgical armamentarium for many phonosurgical interventions. However, the pulse dye laser and potassium titanyl phosphate (KTP) laser have technical drawbacks and a smaller spectrum of indications. METHODS AND RESULTS: The new 445 nm wavelength laser, the so-called 'blue laser', proves to show tissue effects comparable to the KTP laser and is also capable of treating subepithelial vessels due to its photoangiolytic properties, it can coagulate and carbonize at higher energy levels, and can be used via glass fibers in non-contact and contact mode for in-office procedures...
April 19, 2018: European Archives of Oto-rhino-laryngology
Serguei Koulikov, Sergey Assonov, Ales Fajgelj, Pieter Tans
The manuscript explores some advantages and limitations of laser based optical spectroscopy, aimed at achieving robust, high-reproducibility 13 C16 O2 and 12 C16 O2 ratio determinations on the VPDB-CO2 δ13 C scale by measuring the absorbance of line pairs of 13 C16 O2 and 12 C16 O2 . In particular, the sensitivities of spectroscopic lines to both pressure (P) and temperature (T) are discussed. Based on the considerations and estimations presented, a level of reproducibility of the 13 C16 O2 /12 C16 O2 ratio determinations may be achieved of about 10-6 ...
July 1, 2018: Talanta
Mohammad A Halim, Christian Clavier, Xavier Dagany, Michel Kerleroux, Philippe Dugourd, Robert C Dunbar, Rodolphe Antoine
In this study, we report the unimolecular dissociation mechanism of megadalton SO3-containing poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS) polymer cations and anions with the aid of infrared multiphoton dissociation coupled to charge detection ion trap mass spectrometry. A gated electrostatic ion trap ("Benner trap") is used to store and detect single gaseous polymer ions generated by positive and negative polarity in an electrospray ionization source. The trapped ions are then fragmented due to the sequential absorption of multiple infrared photons produced from a continuous-wave CO2 laser...
April 19, 2018: Physical Chemistry Chemical Physics: PCCP
Yang Wang, Qi Liu, Qin Zhang, Bosi Peng, Hexiang Deng
We report a new approach to create metal-binding site in a series of metal-organic frameworks (MOFs), where tetra-topic carboxylate linker, 4',4'',4''',4''''-methanetetrayltetrabiphenyl-4-carboxylic acid, is partially replaced by a tri-topic carbox-ylate linker, tris(4-carboxybiphenyl)amine, in combination with mono-topic linkers, formic acid, trifluoroacetic acid, ben-zoic acid, isonicotinic acid, 4-chlorobenzoic acid, and 4-nitrobenzoic acid, respectively. The distance between these paired-up linkers can be precisely controlled, ranging from 5...
April 18, 2018: Angewandte Chemie
P J Thomson, M L Goodson, D R Smith
BACKGROUND: Clinically identifiable potentially malignant disorders (PMD) precede oral squamous cell carcinoma development. Oral lichenoid lesions (OLL) and proliferative verrucous leukoplakia (PVL) are specific precursor lesions believed to exhibit both treatment resistance and a high risk of malignant transformation (MT). METHODS: A retrospective review of 590 PMD patients treated in Northern England by CO2 laser surgery between 1996 and 2014 was carried out. Lesions exhibiting lichenoid or proliferative verrucous features were identified from the patient database and their clinico-pathological features and outcome post-treatment determined at the study census date of 31 December 2014...
April 16, 2018: Journal of Oral Pathology & Medicine
Shawn M Stevens, Andrew Redmann, Kayla Whitaker, Alyson Ruotanen, Lisa Houston, Theresa Hammer, Ravi N Samy
OBJECTIVE: Report on the safety/efficacy of a novel, carbon dioxide (CO2) laser-assisted protocol for hearing-preservation cochlear implantation (HPCI) and electric-acoustic stimulation (EAS). STUDY DESIGN: Retrospective case review. SETTING: Tertiary referral center. PATIENTS: Adult patients meeting established criteria for HPCI and EAS. INTERVENTION: Therapeutic/rehabilitative. A standardized protocol used CO2 laser to achieve meticulous hemostasis and perform cochleostomy was evaluated...
April 11, 2018: Otology & Neurotology
Dianailys Nunez-Reyes, Kevin M Hickson
The kinetics of the reactions of CO2 with atomic oxygen and atomic carbon in their first excited singlet states have been studied at room temperature and below using the Laval nozzle reactor method. O(1D) and C(1D) atoms were created in-situ by the 266 nm pulsed laser photolysis of O3 and CBr4 precursor molecules respectively. While O(1D) atoms were detected directly by vacuum ultra violet laser induced fluorescence at 115 nm, C(1D) atoms were followed indirectly through a chemical tracer method. The measured rate constants for the O(1D) + CO2 reaction are found to be in excellent agreement with earlier work and extend the available kinetic data for this process down to 50 K...
April 5, 2018: Journal of Physical Chemistry. A
Jonathan P Robson, Pavlo Kokhanenko, Jean K Marshall, Anthony R Phillips, Jan van der Linden
Tissue perfusion during surgery is important in reducing surgical site infections and promoting healing. This study aimed to determine if insufflation of the open abdomen with heated, humidified (HH) carbon dioxide (CO2) increased visceral tissue perfusion and core body temperature during open abdominal surgery in a rodent model. Using two different rodent models of open abdominal surgery, visceral perfusion and core temperature were measured. Visceral perfusion was investigated using a repeated measures crossover experiment with rodents receiving the same sequence of two alternating treatments: exposure to ambient air (no insufflation) and insufflation with HH CO2...
2018: PloS One
Tawfiq Alqurashi, Abdulla Alhosani, Mahmoud Dauleh, Ali K Yetisen, Haider Butt
Optical diffusers provide a solution for a variety of applications requiring a Gaussian intensity distribution including imaging systems, biomedical optics, and aerospace. Advances in laser ablation processes have allowed the rapid production of efficient optical diffusers. Here, we demonstrate a novel technique to fabricate high-quality glass optical diffusers with cost-efficiency using a continuous CO2 laser. Surface relief pseudorandom microstructures were patterned on both sides of the glass substrates...
April 4, 2018: Nanoscale
Stefano Siboni, Alberto Aiolfi, Chiara Ceriani, Gian Eugenio Tontini, Luigi Bonavina
Background and study aims : Endoscopic treatment of Zenker's diverticulum has proven feasible, but electrocautery and CO 2 laser technology carry the risk of collateral thermal injury. Thulium laser septum incision may overcome this limitation. We describe for the first time the use of thulium laser through flexible endoscopy in a small cohort of patients with Zenker diverticulum. Patients and methods : Thulium laser septum division was performed via flexible endoscopy under general anesthesia in consecutive symptomatic patients with primary or recurrent Zenker diverticulum...
April 2018: Endoscopy International Open
Denny Lang, Jonathan Döring, Tobias Nörenberg, Ádám Butykai, István Kézsmárki, Harald Schneider, Stephan Winnerl, Manfred Helm, Susanne C Kehr, Lukas M Eng
We introduce a scattering-type scanning near-field infrared microscope (s-SNIM) for the local scale near-field sample analysis and spectroscopy from room temperature down to liquid helium (LHe) temperature. The extension of s-SNIM down to T = 5 K is in particular crucial for low-temperature phase transitions, e.g., for the examination of superconductors, as well as low energy excitations. The low temperature (LT) s-SNIM performance is tested with CO2 -IR excitation at T = 7 K using a bare Au reference and a structured Si/SiO2 -sample...
March 2018: Review of Scientific Instruments
Kishore Sandu, Marie Helene Perez, David Longchamp, Madeleine Chollet, Francois Gorostidi
Supraglottic stenosis (SPGS) after supraglottoplasty (SGP) for laryngomalacia (LM) is rare, has debilitating consequences in very small patients, and there is no clear mention of its treatment in the current literature. We describe our technique of treating SPGS using the CO2 laser and endoscopic suturing aimed at achieving maximum mucosalisation of the supraglottis. Additional epiglottopexy using Lichtenberger's needle carrier is important to prevent backward tilt of the epiglottis during healing process. Our modification of the laser-assisted SGP technique would lower the chances of developing this complication...
March 30, 2018: Clinical Otolaryngology
Ryota Asahara, Kanji Matsukawa
Our laboratory reported using near-infrared spectroscopy that feedback from limb mechanoafferents may decrease prefrontal oxygenated-hemoglobin concentration (Oxy-Hb) during the late period of voluntary and passive cycling. To test the hypothesis that the decreased Oxy-Hb of the prefrontal cortex would be augmented depending on the extent of limb mechanoafferent input, the prefrontal Oxy-Hb response was measured during motor-driven one- and two-legged passive cycling for 1 min at various revolutions of pedal movement in 19 subjects...
March 28, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
Jiaxi Liu, Gang He, Nan Lu, Xiaoyu Li, Jianqiang Li, Jiangtao Li
The SrAl2O4-Sr3Al2O6 eutectic glass was prepared by using the aerodynamic levitator equipped with CO2 laser device. Bulk transparent amorphous sample was obtained by Spark Plasma Sintering (SPS) of the prepared eutectic glass. XRD, UV-VIS-NIR spectrophotometer and FT-IR were employed to characterize the phase evolution and optical properties. The results showed that the bulk SrAl2O4-Sr3Al2O6 samples fabricated by containerless process and SPS between 852-857℃ were fully amorphous. Amorphous sample has a wide transparent window between 270nm and 6...
March 26, 2018: Nanotechnology
Joanna Jackowska, Elisabeth V Sjogren, Anna Bartochowska, Hanna Czerniejewska-Wolska, Krzysztof Piersiala, Malgorzata Wierzbicka
The purpose of the study was to assess the role of laser-assisted posterior cordectomy in the management of patients with bilateral vocal cord paralysis. We aimed an analysis of 132 consecutive patients treated by CO2 laser posterior cordectomy, aged 38-91, 31% tracheotomized on admission. Cordectomy was performed under microlaryngoscopy using CO2 laser (Lumenis AcuPulse 40 CO2 laser, wavelength 10.6 μm, Lumenis Ltd., Yokneam, Israel). We looked at the number of laser glottic procedures necessary to achieve decannulation in tracheotomized patients and to achieve respiratory comfort in non-tracheotomized subjects and we evaluated the two groups for differences in patient characteristics...
March 20, 2018: Lasers in Medical Science
Won Seon Koh, Jeong Eun Kim, Young Suck Ro, Joo Yeon Ko
BACKGROUND: Despite various treatments attempts, no prospective studies have compared the different therapeutic modalities for treatment of idiopathic guttate hypomelanosis (IGH). This study aimed to compare the efficacy of CO2 fractional laser (CO₂FL), Er:YAG fractional laser (EYFL), and 0.025% topical tretinoin for treating IGH. MATERIALS AND METHODS: A total of 122 lesions were analyzed from 18 patients (mean age, 70.00 ± 20.00 years). Treatment outcome evaluations included the visual analog scale (VAS) to assess lesion severity, investigator's global assessment (IGA) to assess the extent of improvement, and patient's satisfaction score (PSS)...
March 16, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Yan Qu, Ying Wang, Yan Zhang, Chunyu Han, Dong Gao, Waishu Jin, Jinning Liang, Xiujuan Xia
BACKGROUND: Because of long-term exposure of skin, skin aging is an unavoidable natural law with age. Traditional Vitamin A and novel ablative fractional laser technique both have the effects of skin rejuvenation, and studies have demonstrated both of them have apparent clinical efficacy and histology-improving effects on photo-aging skin. MATERIALS AND METHODS: 45 female healthy Wistar rats were selected and the depilation areas of every rat were divided into four regions: control region(Region A), Vitamin A acid region(Region B), combination treatment region(Region C), and fractional laser region(Region D)...
March 15, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Cheng-Chieh Hsu, Wing-Yin Li, Pen-Yuan Chu
RATIONALE: Salivary duct carcinoma (SDC) is a rare and aggressive subtype of salivary gland carcinoma that histologically resembles in situ and invasive ductal carcinoma of the breast. We present the first case of advanced SDC of the minor salivary gland arising from the supraglottis and review the literature on the clinicopathologic characteristics and prognosis of SDC. PATIENT CONCERNS: A 59-year-old male patient with progressive difficulty in swallowing and a muffled voice for 2 months...
March 2018: Medicine (Baltimore)
Tarick J El-Baba, Daniel R Fuller, Daniel W Woodall, Shannon A Raab, Christopher R Conant, Jonathan M Dilger, Yoni Toker, Evan R Williams, David H Russell, David E Clemmer
Ubiquitin confined within nanodroplets was irradiated with a variable-power CO2 laser. Mass spectrometry analysis shows evidence for a protein "melting"-like transition within droplets prior to solvent evaporation and ion formation. Ion mobility spectrometry reveals that structures associated with early steps of denaturation are trapped because of short droplet lifetimes.
March 14, 2018: Chemical Communications: Chem Comm
Lukas Nejdl, Andrea Moravanska, Kristyna Smerkova, Filip Mravec, Sona Krizkova, Adam Pomorski, Artur Krężel, Mirek Macka, Vojtech Adam, Marketa Vaculovicova
A capillary electrophoretic (CE) method using a short-sweep approach and laser-induced fluorescence (LIF) detection (ShortSweepCE-LIF) was developed for determination of Zn2+ and Cd2+ as complexes with highly selective and sensitive fluorescent probe FluoZin-3. The ShortSweepCE-LIF method, established in this work, can be used for examining competitive Zn2+ and Cd2+ binding properties of metalloproteins or peptides. The parameters including background electrolyte composition, injection pressure and time as well as separation voltage were investigated...
August 9, 2018: Analytica Chimica Acta
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