RESUMO
Objective To design an electrical system of extracorporeal shock wave lithotripter for children and adults uses.Methods The shock wave kernel parameters of child energy section of Dornier Delta Ⅱ lithotripter were tested such as peak sound pressure,pressure pulse width and pressure pulse rise time,and then energy calibration was executed for HK.ESWL008 child extracorporeal shock wave lithotripter to make the kernel parameters of the two lithotripters the same or similar to each other.An electrical system was designed with PLC system as the core control unit,involving in wave source 3D motion,large and small C-arms motion,water circulation system,B-type ultrasound positioning system,high-frequency X-ray imaging system,high-voltage condenser charging and discharging system,console and bedside-box-controlled display system as well as electromagnetic compatibility.Results Within A,B,C,1 and 2 energy sections for child lithotripsy the maximum and average differences between the kernel parameters of the two lithotripters were 7.1％ and 3.8％ respectively.There was no difference between the clinical experience by the two lithotripters,and HK.ESWL-008 child extracorporeal shock wave lithotripter passed EMC and safety detections by Guangdong Medical Devices Quality Surveillance and Test Institute of CFDA.Conclusion HK.ESWL-008 child extracorporeal shock wave lithotripter can be used for children lithotripsy clinically.