
Cryotherapy devices (e.g., for dermatology, oncology) must comply with GB 9706.1, YY 0505 (domestic), and IEC 60601-1-2 (international) EMC standards. They utilize throttling cooling via a compressor or high-pressure gas (e.g., liquid nitrogen, nitrous oxide) and may include solenoid valve control, temperature sensors, and timing control units. The standards require that transient noise generated by the solenoid valve operation and conducted emissions from the compressor (e.g., if present) motor be controlled, while ensuring that the temperature monitoring circuit readings are unaffected by these disturbances, guaranteeing the accuracy of treatment time and depth.