1.Application 1.1. Urological calculi 1.2. Urological operation table 2. Working condition 2.1. Environmental temperature: 15?35? 2.2. Relative humid: 45?85% 2.3. Atmospheric pressure: 86?106kPa 2.4. Power requirements: AC 220V 50/60±1Hz, PW?3kW 2.5. Water requirements: Dematerialized water 2.6. Room requirements: 2.6.1. Main room ?3m×3m×2.5m 3. Shock wave generator: Electromagnetic & Electrohydraulic 3.1. Discharging range: EM: 10~16kV EH: 5~11kV 3.2. Capacity storage: EM: 46~104J 3.3. Parameter of second focus of shock wave 3.3.1. Shock wave front ?0.5mS 3.3.2. Shock wave width ?1.0mS 3.3.3. Focal spot area: 7×7×25 mm 3.3.4. Peak value of second focus of shock wave: 20~50mPa 3.3.5. Length of second focus: ?140mm