What are the domestic and international EMC (electromagnetic compatibility) standards for extracorporeal shock wave lithotripsy (ESWL) machines?

Extracorporeal shock wave lithotripsy (ESWL) machines must meet the EMC standards of GB 9706.1, YY 0505 (domestic), and IEC 60601-1-2 (international). They generate shock waves in water through high-voltage discharge (hydraulic-electrohydraulic) or electromagnetic coils (electromagnetic). The high-voltage discharge instantaneously generates an extremely strong electromagnetic pulse (similar to a lightning strike), while the electromagnetic coil's drive circuit produces high-current switching noise. The standards require that these transient interferences be effectively confined within the device, not affecting its own positioning system (e.g., X-ray or ultrasound) and trigger control circuitry, while ensuring the safety of other equipment within the treatment room.