Flexible circuit electrode array and method of manufacturing the same

A method for manufacturing a flexible circuit electrode array adapted to electrically communicate with organic tissue, comprising:

• a) providing a flexible insulator polymer base layer;
• b) curing said insulator polymer base layer;
• c) depositing a metal trace layer containing a base metal coating layer, a metal conducting layer and a metal top coating layer on a surface of said cured insulator polymer base layer;
• d) patterning said metal trace layer by photolithography and forming metal traces on said insulator polymer base layer;
• e) deimidizing said surface of said insulator polymer base layer to improve adhesion of an insulator polymer top layer;
• f) depositing said insulator polymer top layer;
• g) curing said insulator polymer top layer thereby forming one single insulating polymer combined layer with said base insulator polymer base layer and said insulator polymer top layer;
• and
• h) patterning said insulator top polymer layer by photolithography to obtain at least one via adapted to electrically communicate with organic tissue.