hermetic package
Beginner
A sealed metal or ceramic case that keeps body fluids away from the electronics.
Novice
A sealed case, often titanium or ceramic, that keeps moisture and body fluids away from an implant’s electronics. Wires leave it through sealed pass-throughs called feedthroughs.
Expert
Qualified by leak and internal water-vapor tests, corrosion soak tests and environmental stress. The number of feedthroughs limits how many electrodes the chip inside can drive.
Explained in Medical devices (Industries).