*Wesley Seche, Shahram Amini, Pulse Technologies, Quakertown PA 
During the past few decades, cardiac rhythm management (CRM) and neurostimulation devices have been invented and used in clinical practice to achieve electrical stimulation, sensing, recording and pacing. These devices apply artificial stimulation to living tissue through transfer of an external electrical signal from a platinum-iridium alloy implantable electrode across to the membrane of the neural cells or muscular tissue. The performance of such devices is characterized to a large degree by the electrochemical properties at the electrode-tissue interface, that has been shown to significantly improve by the presence of coatings with ultra-high surface area, low-impedance, and enhanced charge exchange capacity such as Titanium Nitride (TiN) for its use in CRM devices. Often, the TiN coatings are deposited on complex geometries such as fixation lead electrodes, therefore, the challenge is to synthesize homogenous coatings over three-dimensional and complex surfaces while maintaining the desired microstructural and electrochemical properties of the coating. Inverted cylindrical magnetron cathodes, which sputter inwards from the surface of cylindrical targets, are ideal for coating cylindrical parts or helix structures that are difficult or impossible to maintain uniform line of sight with planar sputtering techniques. In this work, we will report on the reactive sputtering of TiN coatings using an inverted cylindrical magnetron and their characterization via microstructural and electrochemical techniques.