Battery powered device, likely isolated output channels, and designed to be current limited,
Unless it is safe under all conditions, It is not safe, So the easiest solution is to build it to be that safe, make things by design unable to hurt the person,
Because the company gets no say in how you use there chip, they will never agree to its use in that application, it is left to the designer to meet existing medical safety standards
I literally have built similar devices for dishes filled with nuerons, and you would be suprised how much harder things get when the channel count goes up. Is there anything preventing someone from fitting out my device with scalp electrodes and sticking it to themself? None, but I as a designer am never signing off on it unless I built and tested it for that application. something kills a trained nueron culture, people are pissed as hell, something kills a person, lawsuits are just the beginning.