Hello, I have decided to use old ECG to adapt their inner circuit to the one of "my" phantom (able to recreate leakage currents).

I am now looking for ecg refruibished, but in order to understand if I can use them, I want before to check their technical specification, and in particoular their circuits specifications.
Do you know where is it possible to find the patents? I would like to find the electronic design of ECGs.


thank you