Pseudoporous surface of implantable materials and methods of making the same

Abstract

An implantable medical device can include an electrode substrate electrically connected to at least one electrode. The device can have a pseudoporous surface across the electrode substrate and electrode. This surface can result in a real surface area (RSA) greater than the geometric surface area (GSA) of the device. The pseudoporous surface can be a macroporous surface enabling a charge injection capacity greater than 1 mC/cm2 while minimizing rejection of the device by surrounding tissue in chronic implant applications. The electrode can be a thin layer of conductive material, such as platinum or another metal, conformally deposited on the pseudoporous surface of the electrode substrate. A method of making the implantable device can include forming the device having an electrode substrate and at least one electrode electrically coupled to the electrode substrate, and forming a pseudoporous surface on the electrode substrate and electrode.

Dependencies are inferred from the claim text.