Adherent metal oxide coating forming a high surface area electrode

摘要

An implantable electrode and method for manufacturing the electrode wherein the electrode has a strong, adherent surface inert coating on a conductive coating on the electrode surface, which demonstrates an increase in surface area of at least five times when compared to smooth platinum of the same geometry. An iridium oxide coating may be formed on a platinum coating by a physical deposition process, such as sputtering. The process of electroplating the iridium oxide surface coating is accomplished by voltage control processes. A gradient coating of iridium oxide ranging in composition from essentially pure platinum to essentially pure iridium oxide is produced by sputtering.

主权项

1. An implantable electrode comprising:
a platinum conductive substrate having a basic geometric shape; a fractal platinum adhesion layer conductive coating over the platinum conductive substrate having a surface area greater than five times the basic geometric shape, but less than 500 times the basic geometric shape and contains no lead; a surface coating of inert material over the conductive coating having a capacitance of more than 200 times the capacitance of the conductive substrate.