Just re-read this.
Regulators of implanted medical technology should be demanding that all source code, design docs and other technical material be lodged in escrow.
If the company ceases to make support available, make it all public.
It's one thing for movies or TV shows or video games to disappear "into the vault", but prioritising protection of completely unused IP rights over the the health and wellbeing of patients is criminal.

IEEE Spectrum
Their Bionic Eyes Are Now Obsolete and UnsupportedThese early adopters found out what happened when a cutting-edge marvel became an obsolete gadget... inside their bodies.