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Artificial hip joints with VPS Ti-HA coating

Shanghai Institute of Ceramics, Chinese Academy of Sciences has long been engaged in the research and development of biomedical coatings for orthopedic prosthesis. Since the late 1970’s, the SICCAS has fabricated biocompatible Al2O3, TiO2 and ZrO2 coatings by atmospheric plasma spraying (APS), and successfully developed titanium (Ti) coating and hydroxyapatite (HA) coating using vacuum plasma spraying (VPS). The researches have been rewarded by the National Technology Invention Award of China (1983) and the Shanghai Science and Technology Award (2002, 2009). More than 100 research papers have been published in scientific journals such as Biomaterials, JBMR, Acta Biomaterialia, etc. About 30 invention patents have been developed as well.

Ti coating manufactured by VPS possesses high bonding strength, high roughness, low oxygen content as well as excellent biocompatibility, The Ti coating could enhance the long-term connection between the implant and the bone tissue, and hence prolong the service life of the implant in human body. VPS HA coating has high crystallinity and can meet the clinical requirement without thermal treatment. Excellent bioactivity has been achieved for the HA coating, which could promote the early integration between the implant and the bone tissue, consequently, the healing time after surgery could be shortened and biological fixation of the implant could be significantly improved. The properties of the Ti and HA coatings fabricated in SICCAS could rank the top level among world-wide thermal spray factories. More than 100,000 artificial hip joints with VPS Ti coating or/and HA coating have been manufactured and applied clinically in these years.

The properties of the Ti and HA coatings

 
Powder standard
Thickness
mm
Bonding strength
MPa
Crystallinity%
Roughness
Rmax, mm
Ti coating
ASTM F1580 or ISO 5832-2
150-350
57.6
110-190
HA coating
ISO 13779-2
30-100
33.3
75
VCSA_43Cb0s1T/