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Dependence of calculus retropulsion on pulse duration during Ho: YAG laser lithotripsy.
Lasers Surg Med. 2006 Sep; 38(8):762-72.LS

Abstract

BACKGROUND AND OBJECTIVES

The purpose of this study was to investigate the effect of optical pulse duration on stone retropulsion during Ho:YAG (lambda = 2.12 microm) laser lithotripsy.

STUDY DESIGN/MATERIALS AND METHODS

A clinical Ho:YAG laser with pulse durations was employed to fragment calculus phantoms and to evaluate stone phantom retropulsion. At a given pulse energy, optical pulse durations were divided into two discrete conditions: short pulse (tau(p): 120 to approximately 190 microseconds at FWHM) and long pulse (tau(p): 210 to approximately 350 microseconds at FWHM). Plaster of Paris calculus phantoms were ablated at different energy levels using optical fibers of varying diameters (273, 365, and 550 microm in core size). The dynamics of the recoil action of a calculus phantom was monitored using a high-speed camera; the laser-induced craters were evaluated with optical coherent tomography (OCT). Bubble formation and collapse were recorded with a fast flash photography setup, and acoustic transients were measured with a hydrophone.

RESULTS

Shorter pulse durations produced more stone retropulsion than longer pulses at any given pulse energy. Regardless of pulse duration, higher pulse energy and larger fibers resulted in larger ablation volume and retropulsion (P<0.05). For shorter pulse durations, more rapid bubble expansion was observed and higher amplitudes of the collapse pressure wave were measured (P<0.05).

CONCLUSION

Less retropulsion and equivalent fragmentation occurred when Ho:YAG pulse duration increased.

Authors+Show Affiliations

Department of Biomedical Engineering, The University of Texas at Austin, 1 University Station, Austin, Texas 78712, USA. wookiedokie@mail.utexas.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16868932

Citation

Kang, Hyun Wook, et al. "Dependence of Calculus Retropulsion On Pulse Duration During Ho: YAG Laser Lithotripsy." Lasers in Surgery and Medicine, vol. 38, no. 8, 2006, pp. 762-72.
Kang HW, Lee H, Teichman JM, et al. Dependence of calculus retropulsion on pulse duration during Ho: YAG laser lithotripsy. Lasers Surg Med. 2006;38(8):762-72.
Kang, H. W., Lee, H., Teichman, J. M., Oh, J., Kim, J., & Welch, A. J. (2006). Dependence of calculus retropulsion on pulse duration during Ho: YAG laser lithotripsy. Lasers in Surgery and Medicine, 38(8), 762-72.
Kang HW, et al. Dependence of Calculus Retropulsion On Pulse Duration During Ho: YAG Laser Lithotripsy. Lasers Surg Med. 2006;38(8):762-72. PubMed PMID: 16868932.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dependence of calculus retropulsion on pulse duration during Ho: YAG laser lithotripsy. AU - Kang,Hyun Wook, AU - Lee,Ho, AU - Teichman,Joel M H, AU - Oh,Junghwan, AU - Kim,Jihoon, AU - Welch,Ashley J, PY - 2006/7/27/pubmed PY - 2007/1/31/medline PY - 2006/7/27/entrez SP - 762 EP - 72 JF - Lasers in surgery and medicine JO - Lasers Surg Med VL - 38 IS - 8 N2 - BACKGROUND AND OBJECTIVES: The purpose of this study was to investigate the effect of optical pulse duration on stone retropulsion during Ho:YAG (lambda = 2.12 microm) laser lithotripsy. STUDY DESIGN/MATERIALS AND METHODS: A clinical Ho:YAG laser with pulse durations was employed to fragment calculus phantoms and to evaluate stone phantom retropulsion. At a given pulse energy, optical pulse durations were divided into two discrete conditions: short pulse (tau(p): 120 to approximately 190 microseconds at FWHM) and long pulse (tau(p): 210 to approximately 350 microseconds at FWHM). Plaster of Paris calculus phantoms were ablated at different energy levels using optical fibers of varying diameters (273, 365, and 550 microm in core size). The dynamics of the recoil action of a calculus phantom was monitored using a high-speed camera; the laser-induced craters were evaluated with optical coherent tomography (OCT). Bubble formation and collapse were recorded with a fast flash photography setup, and acoustic transients were measured with a hydrophone. RESULTS: Shorter pulse durations produced more stone retropulsion than longer pulses at any given pulse energy. Regardless of pulse duration, higher pulse energy and larger fibers resulted in larger ablation volume and retropulsion (P<0.05). For shorter pulse durations, more rapid bubble expansion was observed and higher amplitudes of the collapse pressure wave were measured (P<0.05). CONCLUSION: Less retropulsion and equivalent fragmentation occurred when Ho:YAG pulse duration increased. SN - 0196-8092 UR - https://www.unboundmedicine.com/medline/citation/16868932/Dependence_of_calculus_retropulsion_on_pulse_duration_during_Ho:_YAG_laser_lithotripsy_ L2 - https://doi.org/10.1002/lsm.20376 DB - PRIME DP - Unbound Medicine ER -