laser vaporization

The article presents the analysis of effectiveness of laser vaporization for treatment of pain syndrome caused by lumbar disc herniation. We treated 149patients (average age – 40years). 62(41.7%) patients had lumbodynia, 67(45.2%) patients had lumbar ischialgia. Nerve root disorders (radiculopathy, radiculoneuritis) are found in 20(13.1%)patients. 86(57.4%) patients had median hernias of intervertebral disc (disc bulging for 0.6±0.2cm), 36(24.3%) patients had intervertebral disc protrusion and 27(18.3 %) patients had lateral intervertebral hernia (disc bulging for 0.55±0.1 5cm). Satisfactory and good results of laser vaporization are registered in 140(94%) patients with circular protrusion and median hernias with disc bulging up to 7–8mm. Also the decrease in VAS scores of pain syndrome by 2–5points in comparison with initial condition is found. Unsatisfactory results are registered in 9(6%) patients with lateral hernias of more than 5mm and with disease duration more than 6months. ...

Although laser vaporization is a popular minimally invasive treatment for cervical intraepithelial neoplasia (CIN), factors influencing CIN recurrence are understudied. Moreover, the effect of surgeon volume on patients’ prognosis after laser vaporization for CIN is unknown. This single-center retrospective study evaluated the predictive value of surgeon volume and patient characteristics for laser vaporization outcomes in women with pathologically confirmed CIN2. Histologically confirmed CIN2 or higher grade after laser vaporization was defined as persistent or recurrent. Various patient characteristics were compared between women with and those without recurrence to examine the predictive factors for laser vaporization. There were 270 patients with a median age of 36 (18–60) years. The median follow-up period was 25 (6–75.5) months and the median period between treatment and persistence or recurrence was 17 (1.5–69) months. The median annual number of procedures for all seven surg...

PubIk reporting .bude for this collction of inlforrIon is estimalted to avetrae .1 hour p.response. including the time for reviewing Instructions, searching existng dat sources. gaieng and maintn the data need. and completing and reviewing t o no n. Send comets rearding this burden estimate or any other aspect of this collectin of information, including suggestions for reducing this burden, to Washington Headquarters Services. Directorate or Inormation Operations " Reports. 1215 Jefferson Davis Highway, Suite 1204. Arlington. VA 222024302. and to the Office of Management and Budget. Paperwork Reduction Project (0704-0103), Washington, DC 20S03. 1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED

The development of methods to produce nanoparticles with unique properties via the aerosol route is progressing rapidly. Typical characterization techniques extract particles from the synthesis process for subsequent offline analysis, which may alter the particle characteristics. In this work, we use laser-vaporization aerosol mass spectrometry (LV-AMS) with 70-eV electron ionization for real-time, in-situ nanoparticle characterization. The particle characteristics are examined for various aerosol synthesis methods, degrees of sintering, and for controlled condensation of organic material to simulate surface coating/functionalization. The LV-AMS is used to characterize several types of metal nanoparticles (Ag, Au, Pd, PdAg, Fe, Ni, and Cu). The degree of oxidation of the Fe and Ni nanoparticles is found to increase with increased sintering temperature, while the surface organic-impurity content of the metal particles decreases with increased sintering temperature. For aggregate metal particles, the organic-impurity content is found to be similar to that of a monolayer. By comparing different equivalent-diameter measurements, we demonstrate that the LV-AMS can be used in tandem with a differential mobility analyzer to determine the compactness of synthesized metal particles, both during sintering and during material addition for surface functionalization. Further, materials supplied to the particle production line downstream of the particle generators are found to reach the generators as contaminants. The capacity for such in-situ observations is important, as it facilitates rapid response to undesired behavior within the particle production process. This study demonstrates the utility of real-time, in-situ aerosol mass spectrometric measurements to characterize metal nanoparticles obtained directly from the synthesis process line, including their chemical composition, shape, and contamination, providing the potential for effective optimization of process operating parameters.

Background: An ingrowing toenail is an excessive lateral nail growth into the nail fold. It acts as a foreign body and exerts a local pressure sore-like effect, which may result in inflammation and granulation. Several treatment modalities exist, including chemical ablation and different surgical procedures. Here we describe and compare a simple and effective method of partial matricectomy using the CO 2 laser (group A) versus a similar method with the addition of lateral nail fold vaporization (group B). Objective: Outcome evaluation of a modified laser treatment modality for ingrowing toenails and determination of the role of lateral fold vaporization in reducing the recurrence of symptoms. Methods: Forty patients (mean age 32.45 years) were treated with CO 2 laser ablation of toenails between 1999 and 2005 by four physicians. One physician implemented a method that includes lateral nail fold vaporization and resection of the nail segment with its nail bed from 1999 to 2005. Three physicians implemented a similar technique but without lateral fold vaporization between 1999 and 2003, and added lateral fold vaporization to the performed procedure starting in 2004. Results: The recurrence rate was 37.5% in group A and 6.2% in group B. The overall average disease-free follow-up period was 42.2 months. Conclusion: The use of CO 2 laser in the treatment of ingrowing toenails offers an effective modality. We demonstrate the importance of lateral fold vaporization with the CO 2 laser both in improving efficacy and in decreasing recurrence rates over a long followup period.

The hypothesis that fullerenes grow in a carbon plasma by the addition of C 2 units (the "fullerene road") has been widely acclaimed as the most plausible mechanism for formation of larger fullerenes including C 60 and C 70. Calculations suggest that the association of C 2 with fullerenes proceeds through two classes of intermediates, "sticks" and "handles." Here we report the observation of these species using high-resolution ion-mobility measurements for C n cations generated by laser vaporization of graphite and laser desorption of C 60. Sticks with up to eight-atom chains have also been found.

A method is described for the production of large cluster ions by direct laser vaporization in a low-pressure FTMS. Production of high-mass carbon cluster ions (C,' ; 40 < n < 180) and bismuth-antimony (Bi,Sb,?) cluster ions containing up to five metal atoms are reported. The observed distributions are compared with those obtained previously by both direct laser vaporization and molecular beam sources. Details of the mechanism for formation of these larger cluster ions by direct laser vaporization are discussed. The mass selectivity and long ion residence times obtainable in the FIMS may now be utilized in the study of these cluster ions. Results are presented from a limited study of the ion/molecule reactions and collision induced dissociation of the high-mass carbon cluster ions.

Background: Benign prostatic hyperplasia (BPH) is considered one of the most common causes of lower urinary tract symptoms (LUTS), urinary obstruction and urinary retention which usually occurs above age of 40 years. Aim of the Work: to compare the short term effectiveness and complications of bipolar plasma versus laser vaporization of prostate over 6 months duration of follow up post-operative. Patients and Methods: This prospective comparative clinical study (double armed) included 128 patients with prostates less than 80 gm operated upon and followed up in the Urology Department of Ain shams University hospitals in the period from September 2015 to January 2018. The patients were divided into 2 groups: Group A 64 patients who underwent Plasma vaporization. Group B 64 Patients who underwent Quartz Laser Ablation of prostate (QLAP). Results: There were statistically significant differences between both groups as regards prostate volume reduction, PSA reduction and decrease in postvoiding residual urine more in the laser group. While IPSS and QOL reduction and uroflowmetry improvement showed higher improvement in the plasma group. Conclusion: both techniques whether laser vaporization or plasma vaporization are considered safe, effective minimally invasive procedure in managing prostatic enlargement indicated for surgery. Both techniques are similar in the outcome and both lead to improvement of all parameters of prostatic symptoms. Laser vaporization looks to be faster, has stronger power to vaporize more tissues than plasma. No serious complications occurred in both groups. Nevertheless complications are more frequent in the plasma group.

Background: Benign prostatic hyperplasia (BPH) is considered one of the most common causes of lower urinary tract symptoms (LUTS), urinary obstruction and urinary retention which usually occurs above age of 40 years. Aim of the Work: to compare the short term effectiveness and complications of bipolar plasma versus laser vaporization of prostate over 6 months duration of follow up post-operative. Patients and Methods: This prospective comparative clinical study (double armed) included 128 patients with prostates less than 80 gm operated upon and followed up in the Urology Department of Ain shams University hospitals in the period from September 2015 to January 2018. The patients were divided into 2 groups: Group A 64 patients who underwent Plasma vaporization. Group B 64 Patients who underwent Quartz Laser Ablation of prostate (QLAP). Results: There were statistically significant differences between both groups as regards prostate volume reduction, PSA reduction and decrease in postvoiding residual urine more in the laser group. While IPSS and QOL reduction and uroflowmetry improvement showed higher improvement in the plasma group. Conclusion: both techniques whether laser vaporization or plasma vaporization are considered safe, effective minimally invasive procedure in managing prostatic enlargement indicated for surgery. Both techniques are similar in the outcome and both lead to improvement of all parameters of prostatic symptoms. Laser vaporization looks to be faster, has stronger power to vaporize more tissues than plasma. No serious complications occurred in both groups. Nevertheless complications are more frequent in the plasma group.

PubIk reporting .bude for this collction of inlforrIon is estimalted to avetrae .1 hour p.response. including the time for reviewing Instructions, searching existng dat sources. gaieng and maintn the data need. and completing and reviewing t o no n. Send comets rearding this burden estimate or any other aspect of this collectin of information, including suggestions for reducing this burden, to Washington Headquarters Services. Directorate or Inormation Operations " Reports. 1215 Jefferson Davis Highway, Suite 1204. Arlington. VA 222024302. and to the Office of Management and Budget. Paperwork Reduction Project (0704-0103), Washington, DC 20S03. 1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE 17. SECURITY CLASSIFICATION 18. SECURITY CLASSIFICATION 19. SECURITY CLASSIFICATION 20. LIMITATION OF ABSTRACT OF REPORT OF THIS PAGE OF ABSTRACT Unclassified Unclassified Unclai:n1;i4i SAR NSN 7540-01-280-5500 Standard Form 298 (Rev 2-89) Prescribed by ANSI Std 139-1S 296-102

This is a prospective study to assess a complementary treatment for genital warts after laser vaporization. 62 patients were enrolled in two randomized groups: Al: laser vaporization alone. A2: laser vaporization, followed with Pidotimod plus vitamin C for 2 1/2 months. The latter treatment shortened the time of warts remission and marginally decreased the rate of the warts&#39; recurrence: 81% versus 67% (N.S.). Despite the non-significant difference, this complementary treatment seems to have some efficiency.

We report the development of a facile process for the synthesis of hydrogen-terminated graphene using the laser vaporization-controlled condensation (LVCC) method. The method allows rapid deoxygenation of bulk graphite oxide (GO) in an atmosphere of helium or a helium−hydrogen mixture to produce hydrogen-terminated graphene (HTG) nanosheets without the need for any chemical reducing agents or solvents. Direct laser vaporization/ionization (LVI) of bulk GO in a vacuum coupled with a beam expansion of a carrier gas produces the carbon cluster series C n with n in the range 4−30, in addition to hydrogenated carbon ions with a significant enhancement in the ion intensity of the n-even ions suggesting the formation of hydrogen-capped polyyne chains corresponding to the H−(C C) n −H + and H−(CC) n − formulas. In contrast, LVI of bulk graphite under identical experimental conditions generates mainly the carbon cluster series C n without any significant hydrogenation in both the positive and negative ion modes. The results confirm that the LVCC method of bulk GO produces HTG nanosheets which can be ionized and dissociated in a vacuum to produce the observed hydrogen-capped polyyne chains. These species could be deposited from the gas phase to form onedimensional conducting molecular wires for a variety of potential applications in nanoelectronics, sensors, and devices.

Introduction and Objectives: In recent years, Photoselective Vaporization of the Prostate (PVP) has emerged as a new minimally invasive treatment for the symptomatic benign prostatic hyperplasia (BPH). It has numerous peri-operative advantages compared with the traditional transurethral resection of the prostate (TURP); however, durability and long-term effects remain unknown. We report our results in a series of patients with one year follow-up or higher. Materials and Methods: From January 2005 through June 2008, 178 patients underwent PVP as treatment for symptomatic BPH at our institution. The procedure was performed with the Potassium Tytanil Phosphate (KTP) laser (Green Light, Laserscope) at 80 watts, and the purpose in all cases was to create a TURP-like cavity. Of these patients we selected 124 (mean age 64 y/o, range 47 to 84) whom had at least one year of follow-up. We evaluate complications, symptoms, flow, post void residual, and re-treatment rates. Results: At a mean follow-up of 26 months (range 41-12), mean values of max flow, post void residual, IPSS, and QoL scores were 31 ml/seg, 23 cc, 4, and 2 respectively compared with the preoperative mean values of the same parameters that were 13 ml/seg, 170 ml, 21, and 4.6. Two patients needed a second procedure eleven and twelve months later because of residual BPH. Three patients developed bladder neck stricture, two of them underwent a second laser procedure, and after 12 and 13 months of follow-up respectively they have not developed recurrence. The third patient is under surveillance. One patient developed anterior urethral stenosis. Conclusions: In this series PVP has demonstrated to maintain functional and symptomatic benefits at 26 months. Longer follow-up is required to probe if this procedure may become comparable to traditional TURP.

Introduction and Objectives: In recent years, Photoselective Vaporization of the Prostate (PVP) has emerged as a new minimally invasive treatment for the symptomatic benign prostatic hyperplasia (BPH). It has numerous peri-operative advantages compared with the traditional transurethral resection of the prostate (TURP); however, durability and long-term effects remain unknown. We report our results in a series of patients with one year follow-up or higher. Materials and Methods: From January 2005 through June 2008, 178 patients underwent PVP as treatment for symptomatic BPH at our institution. The procedure was performed with the Potassium Tytanil Phosphate (KTP) laser (Green Light, Laserscope) at 80 watts, and the purpose in all cases was to create a TURP-like cavity. Of these patients we selected 124 (mean age 64 y/o, range 47 to 84) whom had at least one year of follow-up. We evaluate complications, symptoms, flow, post void residual, and re-treatment rates. Results: At a mean follow-up of 26 months (range 41-12), mean values of max flow, post void residual, IPSS, and QoL scores were 31 ml/seg, 23 cc, 4, and 2 respectively compared with the preoperative mean values of the same parameters that were 13 ml/seg, 170 ml, 21, and 4.6. Two patients needed a second procedure eleven and twelve months later because of residual BPH. Three patients developed bladder neck stricture, two of them underwent a second laser procedure, and after 12 and 13 months of follow-up respectively they have not developed recurrence. The third patient is under surveillance. One patient developed anterior urethral stenosis. Conclusions: In this series PVP has demonstrated to maintain functional and symptomatic benefits at 26 months. Longer follow-up is required to probe if this procedure may become comparable to traditional TURP.

Multishell fullerenes are the smallest among other multishell carbon clusters such as bigger graphitic onions or multishell nanotubes. Unlike classical fullerenes which have a cage structure and are known to have been synthesized in a variety of sizes (C 60 , C 70 , C 84 , C 102 , etc.), multishel fullerenes have a cage-inside-cage concentric structure such as double-shell C 60 @C 240 or triple-shell C 60 @C 240 @C 560. We report the synthesis of multishell fullerenes by laser vaporization of C 60-containing composite carbon targets. Transmission electron microscopy, Raman scattering spectroscopy and other methods have been used for the product characterization. The yield of the process reaches up to 40%, which permits production in gram amounts even in laboratory conditions.

The experimental results on gas-phase formation of neutral and cationic phosphorus clusters are presented. The clusters have been synthesized by visible (532 nm) or UV (193 nm) laser ablation of crystalline red phosphorus under high vacuum conditions and analyzed using TOF mass spectrometry. Neutral P n clusters produced by 532-nm ablation are found to be even-numbered while P + n cations are mainly odd-numbered with P + 7 and P + 21 being the most abundant ions. For UV laser ablation, stable compound clusters, neutral P 7 H 3 and P 23 H 5 as wellas cations P 23 H + 6 , have been synthesized for the first time. Formation of P n clusters by thermal vaporization of red phosphorus into a cold He gas has also been investigated, and only the small clusters (n < 6) have been discovered. Possible structures of the observed phosporus clusters as well as their formation mechanisms under different conditions are discussed.

The growth times of single-wall carbon nanotubes ͑SWNT's͒ within a high-temperature laser-vaporization ͑LV͒ reactor were measured and adjusted through in situ imaging of the plume of laser-ablated material using Rayleigh-scattered light induced by time-delayed, 308-nm laser pulses. Short SWNT's were synthesized by restricting the growth time to less than 20 ms for ambient growth temperatures of 760-1100°C. Statistical analysis of transmission electron microscope photographs indicated most-probable lengths of 35-77 nm for these conditions. Raman spectra ͑E ex ϭ1.96 and 2.41 eV͒ of the short nanotubes indicate that they are wellformed SWNT's. The temperature of the particles in the vortex-ring-shaped plume during its thermalization to the oven temperature was estimated by collecting its blackbody emission spectra at different spatial positions inside the oven and fitting them to Planck's law. These data, along with detailed oven temperature profiles, were used to deduce a complete picture of the time spent by the plume at high growth temperatures ͑760-1100°C͒. The upper and lower limits of the growth rates of SWNT's were estimated as 0.6 and 5.1 m/s for the typical nanosecond Nd:YAG laser-vaporization conditions used in this study. These measurements permit the completion of a general picture of SWNT growth by LV based on imaging, spectroscopy, and pyrometry of ejected material at different times after ablation, which confirms our previous measurements that the majority of SWNT growth occurs at times greater than 20 ms after LV by the conversion of condensed phase carbon.

We report the development of a facile process for the synthesis of hydrogen-terminated graphene using the laser vaporization-controlled condensation (LVCC) method. The method allows rapid deoxygenation of bulk graphite oxide (GO) in an atmosphere of helium or a helium−hydrogen mixture to produce hydrogen-terminated graphene (HTG) nanosheets without the need for any chemical reducing agents or solvents. Direct laser vaporization/ionization (LVI) of bulk GO in a vacuum coupled with a beam expansion of a carrier gas produces the carbon cluster series C n with n in the range 4−30, in addition to hydrogenated carbon ions with a significant enhancement in the ion intensity of the n-even ions suggesting the formation of hydrogen-capped polyyne chains corresponding to the H−(C C) n −H + and H−(CC) n − formulas. In contrast, LVI of bulk graphite under identical experimental conditions generates mainly the carbon cluster series C n without any significant hydrogenation in both the positive and negative ion modes. The results confirm that the LVCC method of bulk GO produces HTG nanosheets which can be ionized and dissociated in a vacuum to produce the observed hydrogen-capped polyyne chains. These species could be deposited from the gas phase to form onedimensional conducting molecular wires for a variety of potential applications in nanoelectronics, sensors, and devices.

The hypothesis that fullerenes grow in a carbon plasma by the addition of C 2 units (the "fullerene road") has been widely acclaimed as the most plausible mechanism for formation of larger fullerenes including C 60 and C 70. Calculations suggest that the association of C 2 with fullerenes proceeds through two classes of intermediates, "sticks" and "handles." Here we report the observation of these species using high-resolution ion-mobility measurements for C n cations generated by laser vaporization of graphite and laser desorption of C 60. Sticks with up to eight-atom chains have also been found.

Introduction and Objectives: In recent years, Photoselective Vaporization of the Prostate (PVP) has emerged as a new minimally invasive treatment for the symptomatic benign prostatic hyperplasia (BPH). It has numerous peri-operative advantages compared with the traditional transurethral resection of the prostate (TURP); however, durability and long-term effects remain unknown. We report our results in a series of patients with one year follow-up or higher. Materials and Methods: From January 2005 through June 2008, 178 patients underwent PVP as treatment for symptomatic BPH at our institution. The procedure was performed with the Potassium Tytanil Phosphate (KTP) laser (Green Light, Laserscope) at 80 watts, and the purpose in all cases was to create a TURP-like cavity. Of these patients we selected 124 (mean age 64 y/o, range 47 to 84) whom had at least one year of follow-up. We evaluate complications, symptoms, flow, post void residual, and re-treatment rates. Results: At a mean follow-up of 26 months (range 41-12), mean values of max flow, post void residual, IPSS, and QoL scores were 31 ml/seg, 23 cc, 4, and 2 respectively compared with the preoperative mean values of the same parameters that were 13 ml/seg, 170 ml, 21, and 4.6. Two patients needed a second procedure eleven and twelve months later because of residual BPH. Three patients developed bladder neck stricture, two of them underwent a second laser procedure, and after 12 and 13 months of follow-up respectively they have not developed recurrence. The third patient is under surveillance. One patient developed anterior urethral stenosis. Conclusions: In this series PVP has demonstrated to maintain functional and symptomatic benefits at 26 months. Longer follow-up is required to probe if this procedure may become comparable to traditional TURP.

Фіброзно-кістозна мастопатія відноситься до групи дисгормональних захворювань молочних залоз з порушенням тканинної архітектоніки. Враховуючи збільшення показників онкозахворюваності серед жіночого населення, є актуальними рання діагностика та своєчасне лікування любих патологічних станів з групи відносного ризику розвитку раку молочних залоз. При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/3257

Active gold and palladium nanoparticles supported on a variety of oxides (CeO 2 , ZrO 2 , Al 2 O 3 , SiO 2 , MgO and ZnO) were synthesized using laser vaporization and microwave irradiation methods. The catalytic activities for CO oxidation on the nanoparticle catalysts were evaluated and compared among different oxide supports. The effect of shape on the catalytic activity is demonstrated by comparing the activities of the Au and Pd catalysts deposited on MgO nanocubes and ZnO nanobelts. The Au/ CeO 2 nanoparticles deposited on MgO nanocubes exhibit high catalytic activity and stability. The enhanced catalytic activity is attributed to the presence of a significant concentration of the corner and edge sites in MgO nanocubes. The Au-and Pd-doped Mn 2 O 3 nanoparticles show promising results for the low temperature CO oxidation. Several approaches for incorporating the Au and Pd nanocatalysts within mesoporous oxide supports are presented and discussed.

The objective: a study the effect of a complex of hyaluronic acid with plant extracts and a polyphenolic component on cell proliferation and the progression of cervical carcinogenesis.
Materials and methods. 74 patients with cervical pathology (average age is 29.8 years) formed the basic group and were examined in the clinic “Doctor Alex” (Kharkiv), 62 women of them had diathermoconization, 12 – laser vaporization of the cervix. Histologically, high-grade squamous intraepithelial lesions (HSIL) was detected in 20 patients, low-grade squamous intraepithelial lesions (LSIL) was found in 46 women, and epidermal endocervicosis – in 8 persons.
The patients in the basic group during the postoperative period at the stage of healing additionally used vaginal suppositories of hyaluronic acid with plant extracts and polyphenolic component (aloe vera leaf juice, chamomile flower extract, Centella asiatica extract, sea buckthorn oil, tea tree oil, calendula flower extract, epigallocatechin gallate).
The comparison group included 112 women (average age is 32.4 years), 31 of them were diagnosed HSIL, 67 – LSIL, 14 – epidermal endocervicosis; laser vaporization was performed in 21 women, diathermoconization – 91. These patients received antiviral therapy. Markers of proliferation p16 and Ki-67 and the presence of human papilloma virus (HPV) were determined in all women of both groups.
Results. 6 months after the treatment, there was a decrease in the frequency of HPV in the basic group (from 55.4% to 5.4%) and in the comparison group (from 51.8% to 6.3%), proliferation markers – from 23.0% to 2.7% and from 20.5% to 6.3%, respectively. In the basic group, a more rapid epithelialization of the cervix was established, which after laser vaporization lasted 28.7 days, after diathermoconization – 36.9 days, and in the comparison group these indicators were, respectively, 30.2 and 44.6 days.
Conclusions. The use of laser vaporization or diathermoconization of the cervix in the patients with background cervical pathology, LSIL and HSIL in combination with courses of vaginal suppositories containing hyaluronic acid with plant extracts and a polyphenolic component, can significantly reduce the incidence of HPV, leads to a faster recovery of its epithelium and can be comparable in the effectiveness to the combination of laser vaporization / diathermoconization with antiviral therapy.