Fragmentation process induced by microsecond laser pulses during lithotripsy

A fiber optic stress sensing technique is applied to evaluate the fragmentation mechanism for pulsed dye‐laser lithotripsy. We demonstrate for the first time that the fragmentation process with microsecond laser pulses originates from the shock wave induced by the cavitation bubble collapse. This shock occurs some hundreds of microseconds after the laser pulse. The shock induced by the plasma expansion, which occurs during laser irradiation, has a minor effect.

[1]  W. Lauterborn,et al.  Experimental investigations of cavitation-bubble collapse in the neighbourhood of a solid boundary , 1975, Journal of Fluid Mechanics.

[2]  Ralf Brinkmann,et al.  Laser-induced shockwave lithotripsy by use of a 1-μs Alexandrite laser , 1990, Photonics West - Lasers and Applications in Science and Engineering.

[3]  Werner Lauterborn,et al.  Acoustic transient generation by laser‐produced cavitation bubbles near solid boundaries , 1988 .

[4]  R. Anderson,et al.  Acoustic studies of the role of immersion in plasma-mediated laser ablation , 1987 .

[5]  E. Bartoli,et al.  Letter: Drug-induced asthma. , 1976, Lancet.

[6]  J. A. Landt,et al.  LASER‐INDUCED HIGH‐PRESSURE SHOCK WAVES IN WATER , 1967 .

[7]  J. Wickham,et al.  Lasertripsy for ureteric stones in 120 cases: lessons learned. , 1988, British journal of urology.

[8]  J. Parrish,et al.  The pulsed dye laser for fragmenting urinary calculi. , 1987, The Journal of urology.

[9]  L. Rayleigh.  VIII. On the pressure developed in a liquid during the collapse of a spherical cavity , 1917 .

[10]  N. C. Anderholm.  LASER‐GENERATED STRESS WAVES , 1970 .

[11]  J. Wickham,et al.  INITIAL EXPERIENCE WITH A PULSED DYE LASER FOR URETERIC CALCULI , 1986, The Lancet.

[12]  A. D. Zweig,et al.  Non-invasive determination of shock wave pressure generated by optical breakdown , 1991 .

[13]  H. Schmidt-Kloiber,et al.  Laserinduced Shock-Wave Lithotripsy (LISL) - Die Laserinduzierte Stoßwellenlithotripsie (LISL) , 1985 .

[14]  R. Anderson,et al.  Microsecond‐long flash photography of laser‐induced ablation of biliary and urinary calculi , 1987, Lasers in surgery and medicine.

[15]  S. Dretler,et al.  An evaluation of ureteral laser lithotripsy: 225 consecutive patients. , 1990, The Journal of urology.

[16]  R. Anderson,et al.  Optical studies of pulsed-laser fragmentation of biliary calculi , 1987 .