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

The core of EMC design for an electrocardiograph (ECG) lies in protecting the high input impedance analog front-end. Before each lead enters the analog switch, a small-value resistor should be connected in series and a low-leakage-current TVS (e.g., SMF series) should be connected in parallel, or an integrated multi-path protection ESD array (e.g., ESDSV05-4H) should be used to discharge static electricity and limit overvoltage. To suppress power supply common-mode noise picked up by the leads, a right-leg drive circuit should be used, with high-precision resistors and capacitors on its feedback path. The metal parts of the device casing must be properly grounded, and all I/O ports (e.g., USB, Bluetooth module power supplies) should be equipped with ferrite beads (PBZ1005 series) and ESD protection (ESDLC5V0D3B) to prevent interference from coupling in through the ports, ensuring clear ECG recording even in electromagnetic environments.