Which EMC (electromagnetic compatibility) devices are helpful for the design and modification of surgical electrosurgical units?

The EMC design goals of an electrosurgical unit are to suppress output noise and purify the power supply. The output cables (pen, board) should use high-shielding coaxial cables with continuous shielding at the connectors. A low-pass filter network can be designed at the output of the power amplifier to attenuate harmonics above the operating frequency. The switching power supply section of the electrosurgical unit must use a fully shielded transformer and high-performance EMI filters at both the input and output ends. Electromagnetic shielding gaskets should be installed in all gaps in the unit (e.g., vents). Surge protection devices (e.g., 14D series varistors or gas discharge tubes) must be installed at the power input.