RalfBrinkmann, Ansgar Knipper*, Gent Droge,

thermo-mechanical mechanism of tissue ablation was evaluated by fast flash photography showing agrowing influence ofthe cavitation bubble towards shorter pulse lengths.In a first clinical study 14 patients underwent the laser therapy. We used the Holmium laser in thefree running mode at a pulse repetition rate of 1 0 Hz and with an average power of 3 W at the end of a300 .tm fiber. The reopening of the stenoses took about 19 mm. with an average laser energy of 8 1 9 J