I think if you look around hospitals and science labs you will find there is some old electrical equipment that is still used because of how reliable it is.
Other examples include bakelite Telephones from the 30s and Radios from even earlier still being fully operational.
Incorporating electrical equipment in implant and prosthesis should be just fine, but it should come ready out of the box with no need for updates whatsoever and the software that is prevalent open source so you don’t need to rely on a for profit company to maintain your health post surgery.