Cavitation bubble dynamics during thulium fiber laser lithotripsy

Luke A. Hardy, Joshua D. Kennedy, Christopher R. Wilson, Pierce B. Irby, Nathaniel M. Fried

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The Thulium fiber laser (TFL) is being explored for lithotripsy. TFL parameters differ from standard Holmium:YAG laser in several ways, including smaller fiber delivery, more strongly absorbed wavelength, low pulse energy/high pulse rate operation, and more uniform temporal pulse structure. High speed imaging of cavitation bubbles was performed at 105,000 fps and 10 μm spatial resolution to determine influence of these laser parameters on bubble formation. TFL was operated at 1908 nm with pulse energies of 5-75 mJ, and pulse durations of 200-1000 μs, delivered through 100-μm-core fiber. Cavitation bubble dynamics using Holmium laser at 2100 nm with pulse energies of 200-1000 mJ and pulse duration of 350 μs was studied, for comparison. A single, 500 μs TFL pulse produced a bubble stream extending 1090 ± 110 μm from fiber tip, and maximum bubble diameters averaged 590 ± 20 μm (n=4). These observations are consistent with previous studies which reported TFL ablation stallout at working distances <1.0 mm. TFL bubble dimensions were five times smaller than for Holmium laser due to lower pulse energy, higher water absorption coefficient, and smaller fiber diameter used.

Original languageEnglish (US)
Title of host publicationPhotonic Therapeutics and Diagnostics XII
PublisherSPIE
Volume9689
ISBN (Electronic)9781628419245
DOIs
StatePublished - 2016
Externally publishedYes
EventPhotonic Therapeutics and Diagnostics XII - San Francisco, United States
Duration: Feb 13 2016Feb 14 2016

Other

OtherPhotonic Therapeutics and Diagnostics XII
CountryUnited States
CitySan Francisco
Period2/13/162/14/16

Keywords

  • ablation
  • cavitation bubbles
  • holmium
  • kidney stones
  • laser
  • lithotripsy
  • thulium

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Radiology Nuclear Medicine and imaging

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  • Cite this

    Hardy, L. A., Kennedy, J. D., Wilson, C. R., Irby, P. B., & Fried, N. M. (2016). Cavitation bubble dynamics during thulium fiber laser lithotripsy. In Photonic Therapeutics and Diagnostics XII (Vol. 9689). [96891B] SPIE. https://doi.org/10.1117/12.2208168