The Effect of Electropolishing and Magnetoelectropolishing on the Biocompatibility of Porous Nitinol Implant

摘要

Porous Nitinol (PNT) prepared by self-propagating high temperature synthesis has become the focus of orthopedic applications despite concerns regarding nickel release from implant devices. The effect of electropolishing (EP) and magneto-electropolishing (MEP) on the corrosion resistance and cytotoxicity of PNT were investigated. These properties not only de-termine the effective lifetime of the device, but also provide some insight into the release of deleterious metal ions. It is recognized that the surface finish of implant materials plays a major role in bone-implant osseointegration. Zhang et al. (2008) and Hryniewicz et al. (2009) reported that MEP on titanium resulted in a nanostructured surface that is ideal for bone implant osseointegration as compared with a micro-structured EP surface. This research also focused on comparing the osseointegration of PNT subjected to EP and MEP. The morphology and depth profile of the surface treated PNT was analyzed using SEM and XPS analysis respectively.