Long-term reliability of Al₂O₃and Parylene C bilayer encapsulated Utah electrode array based neural interfaces for chronic implantation

The trends of increasing electrode impedance of wired devices and performance stability of wireless and active devices support the significantly greater encapsulation performance of this bilayer encapsulation compared with Parylene-only encapsulation. The bilayer encapsulation should significantly improve the in vivo lifetime of neural interfaces for chronic implantation.