Plasma Surface Modification of Nickel Titanium Shape Memory Alloys
Pp. 45-68 (24)
Kelvin Wai-Kwok Yeung, Kenneth MC Cheung, Keith Dip-Kei Luk, Shuilin Wu, Xuanyong Liu, Chenglin Chu, Chi Yuan Chung and Paul Kim-Ho Chu
Nickel-titanium (NiTi) shape memory alloys are very potential for surgical implantation due
to two unique properties: super-elasticity and shape memory effect. These advantages cannot be seen
in current biomedical metallic materials such as medical grade titanium alloys and stainless steels.
However, nickel ion release remains a major concern particularly for large implants placed on the
spine or joints, as fretting is always expected at such implant junctions. Therefore, an advanced surface
treatment using plasma immersion ion implantation (PIII) technology to tackle this issue
Division of Spine Surgery, Department of Orthopedics & Traumatology, The University of Hong Kong, Hong Kong.