
EMC of a hysteroscopic system requires additional attention to fluid circuit control compared to a laparoscopic system. The motor driver for the irrigation pump (typically a peristaltic or plunger pump) should be low-noise, its pressure sensor signal line must be shielded, and differential transmission or isolation amplifiers should be used for signal conditioning. The heater for the distending fluid (e.g., present) should be stably controlled using a PID algorithm and a solid-state relay (with RC absorption). The system should be designed with redundant pressure safety monitoring mechanisms, ensuring overpressure protection through independent hardware loops even if the main control circuit is subjected to transient disturbances. All fluid circuit-related electronic units should be partitioned within the chassis along with the camera unit.