2Zorcher T,Hochberger J,Schrott KM,et al.In vitro study concerning the effiency of the frequency-double-pulse Neodymium YAG laser(FRED-DY)for lithotripsy of calculi in the urinary tract.Laser Surg Med,1999,25(1):38~42.
4Lam JS,Greene TD, Gupa M. Treatment of proximal ureteral calculi: holmium: YAG laser ureterolithotripsy versus extracoporeal shock wave lithotripsy[J]. J Urol, 2002, 167(5): 1972-1976.
5Sofer M, Watterson JD, Wollin TA, et al. Holmium: YAG laser lithotripsy for upper urinary tract calculi in 598 patients[J]. J Urol, 2004, 167(1): 31-34.
6Thomas Z ,Juergen H ,Kari M S ,et al . In vitro study concerning the efficiency of the Frequency-Doubled Double-pulse Neodymium :YAG laser (FREDDY) for lithotripsy of calculi in the urinary tract. Lasers Surg Med .1999.25:38-42.
7Brande H ,Rather P .Endoscopic urinary stone lithotripsy with the U100 laser [ FREDDY Technology ] first cninical trials on 104 patients . 48th annual meeting of urology in North Rhine West Phalia Germany. Cologne ,2002,18.