Iridium Oxide Coating with Cauliflower Morphology for Functional Electrical Stimulation Applications
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Jul 16, 2012
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Jul 15, 2011
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Abstract
An iridium oxide coating for application on an external surface of an electrode of a medical lead is described. The iridium coating is applied using pulse DC sputtering. The coating provides the electrode with an increased double layer capacitance and a reduced electrical impedance. The iridium oxide coating is characterized as having a dense structure with a surface morphology having the general appearance of a fractal or cauliflower shape. The pulse DC sputtered iridium oxide coating is achieved through a mixture ratio of oxygen and argon gases, a sputtering power of between 75 to 125 W, a chamber pressure ranging from about 20-30 mTorr, and a frequency ranging from 50 kHz to 150 kHz. The coated electrode may be used to facilitate the injection of electrical charge stimulation and/or monitor biorhythms of cardiac and neurological tissue.
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