Chemical decomposition of urinary stones during Holmium laser lithotripsy - Part I: Lack of a photomechanical effect

Kin Foong Chan, George J. Vassar, Joshua Pfefer, Joel M H Teichman, Randolph D. Glickman, Susan E. Weintraub, Ashley J. Welch

Producción científica: Chapter

1 Cita (Scopus)

Resumen

The Ho:YAG laser commonly used for clinical lithotripsy of urinary stones typically emits 250-μs pulses at a wavelength of 2.12 μm and repetition rates of up to 10 Hz. This pulse duration is longer than the time required for a pressure wave to propagate beyond the optical penetration depth of this wavelength in water. Fast-flash photography was used to study the dynamics of urinary stone fragmentation by the Ho:YAG laser. Stone ablation began approximately 50 μs after the onset of the laser pulse, long before the collapse of the cavitation bubble at about 350 μs. Pressure measurements, made with a PVDF needle-hydrophone and correlated with the fast-flash images, indicated that the peak acoustical transient was less than 2 bars. Regardless of fiber orientation to the stone, no shockwaves were recorded at the beginning of the bubble, and the maximum pressure waves recorded at bubble collapse were approximately 20 bars. However, no fragmentation occurred during or subsequent to the bubble collapse. These measurements indicated that stone ablation was not due to a photomechanical effect.

Idioma originalEnglish (US)
Título de la publicación alojadaProceedings of SPIE - The International Society for Optical Engineering
EditorialSociety of Photo-Optical Instrumentation Engineers
Páginas377-386
Número de páginas10
Volumen3601
EstadoPublished - 1999
EventoProceedings of the 1999 Laser-Tissue Interaction X: Photochemical, Photothermal, and Photomechanical - San Jose, CA, USA
Duración: ene 24 1999ene 27 1999

Other

OtherProceedings of the 1999 Laser-Tissue Interaction X: Photochemical, Photothermal, and Photomechanical
CiudadSan Jose, CA, USA
Período1/24/991/27/99

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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