Comparative performance of infrared solid state lasers in laser lithotripsy

摘要

Abstract: This paper describes the experimental investigation of the fragmentation processes of urinary stones by Cr,Nd:YSGG laser radiation (2.79 $mu@m). The laser operated in a pulse free-running regime with the pulse energy up to 1 J and pulse duration of 250-550 $mu@m. It was shown that about 3 kJ of total radiation energy was required in order to ablate 1 g of urinary calculus. In those conditions, the stone substance was broken in a small fibrous-like dust. The maximum size of particles did not exceed 0.2-0.4 mm. The qualitative comparison of the stone ablation efficiency for the Cr,Er:YSGG laser, Cr,Nd:YSGG laser (1.06 $mu@m), and Cr,Tm,Ho:YSGG laser (2.09 $mu@m) was carried out.!