In vitro comparison of shock wave lithotripsy machines

Purpose: We tested the hypothesis that shock wave lithotripsy machines vary in the ability to fragment stones to small size.Materials and Methods: Calcium oxalate monohydrate, calcium hydrogen phosphate dihydrate, cystine and magnesium ammonium phosphate hexahydrate calculi were fragmented in vitro with the 22 kV. Dornier HM3, § §Dornier Medical Systems, Inc., Marietta, Georgia. 20 kV. Storz Modulith SLX, ∥ ∥Storz Medical, Kreuzlingen, Switzerland., 15.6 kV. Siemens Lithostar C, ¶ ¶Siemens Medical Systems, Inc., Iselin, New Jersey. 24 kV. Medstone STS-T, ** **Medstone International, Inc., Aliso Viejo, California. 26 kV. HealthTronics LithoTron 160, †† ††HealthTronics, Inc., Atlanta, Georgia. 20 kV. Dornier Doli § and 22.5 kV. Medispec Econolith ‡‡ ‡‡Medispec, Montgomery Village, Maryland. lithotriptors. Stones were given 500 or 2,000 shocks, or the Food and Drug Administration limit. Post-lithotripsy fragment size was characterized using sequential sieves and compared.Results: Stone mass was statistically...