In search of optimal settings for Ho:YAG laser-lithotripsy to maximize the ablation rate, while minimizing the retropulsion

2020 ◽  
Author(s):  
Jian J. Zhang ◽  
Dongyul Chai ◽  
Jason R. Xuan ◽  
Aditi Ray ◽  
Thomas C. Hasenberg ◽  
...  
Keyword(s):  
Ablation Rate ◽  
Laser Lithotripsy ◽  
Ho:Yag Laser ◽  
Optimal Settings

scholarly journals Impact of pulse duration on Ho:YAG laser lithotripsy: fragmentation and dusting performance

2014 ◽  
Vol 33 (4) ◽  
pp. 471-477 ◽  
Author(s):  
Markus J. Bader ◽  
Thomas Pongratz ◽  
Wael Khoder ◽  
Christian G. Stief ◽  
Thomas Herrmann ◽  
...  
Keyword(s):  
Pulse Duration ◽  
Laser Lithotripsy ◽  
Ho:Yag Laser

scholarly journals Numerical Response Surfaces of Volume of Ablation and Retropulsion Amplitude by Settings of Ho:YAG Laser Lithotripter

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Jian J. Zhang ◽  
Jonathan Rutherford ◽  
Metasebya Solomon ◽  
Brian Cheng ◽  
Jason R. Xuan ◽  
...  
Keyword(s):  
Pulse Energy ◽  
Pulse Width ◽  
High Speed ◽  
Operation Time ◽  
Laser Lithotripsy ◽  
Pulse Number ◽  
Response Surfaces ◽  
Ho:Yag Laser ◽  
Energy Pulse ◽  
Best Fit

Objectives.Although laser lithotripsy is now the preferred treatment option for urolithiasis due to shorter operation time and a better stone-free rate, the optimal laser settings for URS (ureteroscopic lithotripsy) for less operation time remain unclear. The aim of this study was to look for quantitative responses of calculus ablation and retropulsion by performing operator-independent experiments to determine the best fit versus the pulse energy, pulse width, and the number of pulses.Methods.A lab-built Ho:YAG laser was used as the laser pulse source, with a pulse energy from 0.2 J up to 3.0 J and a pulse width of 150 μs up to 1000 μs. The retropulsion was monitored using a high-speed camera, and the laser-induced craters were evaluated with a 3-D digital microscope. The best fit to the experimental data is done by a design of experiment software.Results.The numerical formulas for the response surfaces of ablation speed and retropulsion amplitude are generated.Conclusions.The longer the pulse, the less the ablation or retropulsion, while the longer pulse makes the ablation decrease faster than the retropulsion. The best quadratic fit of the response surface for the volume of ablation varied nonlinearly with pulse duration and pulse number.

The study of laser pulse width on efficiency of Ho:YAG laser lithotripsy

2017 ◽  
Author(s):  
Jian J. Zhang ◽  
Jonathan Rutherford ◽  
Metasebya Solomon ◽  
Brian Cheng ◽  
Jason R. Xuan ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Pulse Width ◽  
Laser Lithotripsy ◽  
Ho:Yag Laser ◽  
Laser Pulse Width

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.

Successful removal of an encrusted metallic ureteral stent using a disposable ureteroscope and Ho:YAG laser lithotripsy

Urolithiasis ◽  
2019 ◽  
Vol 48 (3) ◽  
pp. 281-282 ◽  
Author(s):  
Takashi Kawahara ◽  
Kota Kobayashi ◽  
Shinnosuke Kurora ◽  
Masahiro Yao ◽  
Hiroji Uemura
Keyword(s):  
Laser Lithotripsy ◽  
Ureteral Stent ◽  
Ho:Yag Laser ◽  
Successful Removal

The optimal dusting mode for Ho:YAG laser lithotripsy

2021 ◽  
Author(s):  
Jian J. Zhang ◽  
Dongyul Chai ◽  
Rongwei J. Xuan ◽  
Aditi Ray ◽  
Thomas Hasenberg ◽  
...  
Keyword(s):  
Laser Lithotripsy ◽  
Ho:Yag Laser
Sign in / Sign up

Export Citation Format

Share Document