scholarly journals Holmium: yttrium-aluminum-garnet (Ho:YAG) laser for resection of bladder tumor in a pediatric patient

2015 ◽  
Vol 2 (5) ◽  
pp. 10-10
Author(s):  
Suleyman Cakmakci Cakmakci ◽  
Necmettin Penbegul ◽  
Mehmet Mazhar Utangac ◽  
Mansur Daggulli ◽  
Onur Dede ◽  
...  
Keyword(s):  
Pediatric Patient ◽  
Bladder Tumor ◽  
Yttrium Aluminum Garnet ◽  
Ho:Yag Laser ◽  
Yttrium Aluminum

scholarly journals Feasibility and long-term safety of Ho:YAG laser lithotripsy in broncholithiasis patients

2020 ◽  
Author(s):  
Yuan Cheng ◽  
Guangfa Wang ◽  
Wei Zhang ◽  
Hong Zhang ◽  
Xi Wang
Keyword(s):  
Pulse Energy ◽  
Yttrium Aluminum Garnet ◽  
Pulse Frequency ◽  
Laser Lithotripsy ◽  
Rigid Bronchoscopy ◽  
Ho:Yag Laser ◽  
Yttrium Aluminum ◽  
Long Term Follow Up

Abstract Background: Treatment of broncholithiasis is complex, especially in the case of a large or transbronchial broncholith. Holmium-yttrium aluminum garnet (Ho:YAG) laser lithotripsy may be a useful treatment in broncholithiasis; however, as it is not yet common practice, the optimal parameters are unknown. Methods: We performed a single-center retrospective analysis of the clinical data of 13 broncholithiasis patients who underwent Ho:YAG laser lithotripsy from May 2012 to October 2018. Results: For the 13 patients (2 males and 11 females), Ho:YAG laser lithotripsy was performed 17 times, in total. All procedures were performed under general anesthesia with rigid bronchoscopy. We initially set the Ho:YAG laser to a pulse frequency of 5 Hz and a pulse energy of 0.8 J, gradually increasing these as required. The pulse frequency range we employed was 5-15 Hz, and the pulse energy range was 0.8-1.6 J. All broncholiths were successfully extracted after lithotripsy, and all symptoms improved. Hemoptysis, bronchial esophageal fistula, and pneumonia were the most common complications; however, there were no long-term complications. Conclusions: Ho:YAG laser lithotripsy is an effective and safe treatment for broncholithiasis, over a long-term follow up.

scholarly journals Minimally Invasive Management of Iatrogenic Ureteral Injuries with Ureteroscope Facilitated by Holmium Yttrium-Aluminum-Garnet Laser

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Zongyao Hao ◽  
Li Zhang ◽  
Jun Zhou ◽  
Xiansheng Zhang ◽  
Haoqiang Shi ◽  
...  
Keyword(s):  
Yttrium Aluminum Garnet ◽  
High Rate ◽  
Surgical Approaches ◽  
Ho:Yag Laser ◽  
Minimal Scarring ◽  
Novel Approach ◽  
Ureteral Injuries ◽  
Yttrium Aluminum ◽  
Invasive Management

The ureter is vulnerable during general, gynecologic, and urologic surgeries. The traditional open surgical approaches to treating the iatrogenic ureteral injuries have shown several disadvantages such as relatively high rate of severe complications. Although the applications of endourological techniques for management of lower ureteral strictures have been routinely introduced over the last 10 years, most of the different modalities were based on the utilization of hydrophilic instruments that can facilitate the traversal of strictures surrounded by the sutures with gradually increasing force. Interestingly, we have revealed the Ho:YAG laser as the outstanding auxiliary approach to incising the sutures during the ureteroscopy for its well-controlled penetration depth, minimal scarring, and precise cutting. As far as we know, the combined utilization of Ho:YAG laser to incise the sutures responsible for the strictures and double J ureteral stent for drainage has not been extensively reported. Normal ureters of the patients managed by this novel approach were shown by the follow-up 3-4 months later, which demonstrated that the available technique was promising to effectively treat the iatrogenic ureteral injuries.

scholarly journals Feasibility and Long-Term Safety of Ho:YAG Laser Lithotripsy in Broncholithiasis Patients

2020 ◽  
Author(s):  
Yuan Cheng ◽  
Guangfa Wang ◽  
Wei Zhang ◽  
Hong Zhang ◽  
Xi Wang
Keyword(s):  
Pulse Energy ◽  
Yttrium Aluminum Garnet ◽  
Pulse Frequency ◽  
Laser Lithotripsy ◽  
Rigid Bronchoscopy ◽  
Ho:Yag Laser ◽  
Yttrium Aluminum ◽  
Long Term Follow Up

Abstract Background Treatment of broncholithiasis is complex, especially in the case of a large or transbronchial broncholith. Holmium-yttrium aluminum garnet (Ho:YAG) laser lithotripsy may be a useful treatment in broncholithiasis; however, as it is not yet common practice, the optimal parameters are unknown.Objectives We investigated the feasibility and long-term safety of Ho:YAG lithotripsy in broncholithiasis patients.Method We performed a single-center retrospective analysis of the clinical data of 13 broncholithiasis patients who underwent Ho:YAG laser lithotripsy from May 2012 to October 2018.Result For the 13 patients (2 males and 11 females), Ho:YAG laser lithotripsy was performed 17 times, in total. All procedures were performed under general anesthesia with rigid bronchoscopy. We initially set the Ho:YAG laser to a pulse frequency of 5 Hz and a pulse energy of 0.8 J, gradually increasing these as required. The pulse frequency range we employed was 5-15 Hz, and the pulse energy range was 0.8-1.6 J. All broncholiths were successfully extracted after lithotripsy, and all symptoms improved. Hemoptysis, bronchial esophageal fistula, and pneumonia were the most common complications; however, there were no long-term complications.Conclusions Ho:YAG laser lithotripsy is an effective and safe treatment for broncholithiasis, over a long-term follow up.

scholarly journals Feasibility and long-term safety of Ho:YAG laser lithotripsy in broncholithiasis patients

2020 ◽  
Author(s):  
Yuan Cheng ◽  
Guangfa Wang ◽  
Wei Zhang ◽  
Hong Zhang ◽  
Xi Wang
Keyword(s):  
Pulse Energy ◽  
Yttrium Aluminum Garnet ◽  
Pulse Frequency ◽  
Laser Lithotripsy ◽  
Rigid Bronchoscopy ◽  
Ho:Yag Laser ◽  
Yttrium Aluminum ◽  
Long Term Follow Up

Abstract BackgroundTreatment of broncholithiasis is complex, especially in the case of a large or transbronchial broncholith. Holmium-yttrium aluminum garnet (Ho:YAG) laser lithotripsy may be a useful treatment in broncholithiasis; however, as it is not yet common practice, the optimal parameters are unknown. MethodsWe performed a single-center retrospective analysis of the clinical data of 13 broncholithiasis patients who underwent Ho:YAG laser lithotripsy from May 2012 to October 2018.ResultsFor the 13 patients (2 males and 11 females), Ho:YAG laser lithotripsy was performed 17 times, in total. All procedures were performed under general anesthesia with rigid bronchoscopy. We initially set the Ho:YAG laser to a pulse frequency of 5 Hz and a pulse energy of 0.8 J, gradually increasing these as required. The pulse frequency range we employed was 5-15 Hz, and the pulse energy range was 0.8-1.6 J. All broncholiths were successfully extracted after lithotripsy, and all symptoms improved. Hemoptysis, bronchial esophageal fistula, and pneumonia were the most common complications; however, there were no long-term complications.ConclusionsHo:YAG laser lithotripsy is an effective and safe treatment for broncholithiasis, over a long-term follow up.

scholarly journals Feasibility and long-term safety of Ho:YAG laser lithotripsy in broncholithiasis patients

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yuan Cheng ◽  
Guangfa Wang ◽  
Wei Zhang ◽  
Hong Zhang ◽  
Xi Wang
Keyword(s):  
Pulse Energy ◽  
Yttrium Aluminum Garnet ◽  
Pulse Frequency ◽  
Laser Lithotripsy ◽  
Rigid Bronchoscopy ◽  
Ho:Yag Laser ◽  
Yttrium Aluminum ◽  
Long Term Follow Up

Abstract Background Treatment of broncholithiasis is complex, especially in the case of a large or transbronchial broncholith. Holmium-yttrium aluminum garnet (Ho:YAG) laser lithotripsy may be a useful treatment in broncholithiasis; however, as it is not yet common practice, the optimal parameters are unknown. Methods We performed a single-center retrospective analysis of the clinical data of 13 broncholithiasis patients who underwent Ho:YAG laser lithotripsy from May 2012 to October 2018. Results For the 13 patients (2 males and 11 females), Ho:YAG laser lithotripsy was performed 17 times, in total. All procedures were performed under general anesthesia with rigid bronchoscopy. We initially set the Ho:YAG laser to a pulse frequency of 5 Hz and a pulse energy of 0.8 J, gradually increasing these as required. The pulse frequency range we employed was 5–15 Hz, and the pulse energy range was 0.8–1.6 J. All broncholiths were successfully extracted after lithotripsy, and all symptoms improved. Hemoptysis, bronchial esophageal fistula, and pneumonia were the most common complications; however, there were no long-term complications. Conclusions Ho:YAG laser lithotripsy is an effective and safe treatment for broncholithiasis, over a long-term follow up.

Yag Single Crystals for Scintillators of Stem

1990 ◽  
Vol 48 (1) ◽  
pp. 166-167
Author(s):  
M. Hibino ◽  
K. Irie ◽  
R. Autrata ◽  
P. schauer
Keyword(s):  
Single Crystals ◽  
Yttrium Aluminum Garnet ◽  
Light Guide ◽  
Detection System ◽  
Polished Surface ◽  
Detective Quantum Efficiency ◽  
Backscattered Electrons ◽  
Electron Detection ◽  
Yttrium Aluminum ◽  
Phosphor Screens

Although powdered phosphor screens are usually used for scintillators of STEM, it has been found that the phosphor screen of appropriate thickness should be used depending on the accelerating voltage, in order to keep high detective quantum efficiency. 1 It has been also found that the variation in sensitivity, due to granularity of phosphor screens, makes the measurement of fine electron probe difficult and that the sensitivity reduces with electron irradiation specially at high voltages.In order to find out a preferable scintillator for STEM, single crystals of YAG (yttrium aluminum garnet), which are used for detecting secondary and backscattered electrons in SEM were investigated and compared with powdered phosphor screens, at the accelerating voltages of 100kV and 1 MV. A conventional electron detection system, consisting of scintillator, light guide and PMT (Hamamatsu Photonics R268) was used for measurements. Scintillators used are YAG single crystals of 1.0 to 3.2mm thicknesses (with surfaces matted for good interface to the light guide) and of 0.8mm thickness (with polished surface), and powdered P-46 phosphor screens of 0.07mm and 1.0mm thicknesses for 100kV and 1MV, respectively. Surfaces on electron-incidence side of all scintillators are coated with reflecting layers.

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