CALCIUM PHOSPHATE COATING FOR TITANIUM AND ITS ALLOYS, METHOD FOR FORMING SUCH COATING Russian patent published in 2007 - IPC C25D11/26 A61F2/02 

FIELD: medical devices, namely processes for forming coatings on surfaces of implants made of titanium in recrystallized or nano-structure state.

SUBSTANCE: coating contains, mass %: calcium titanate, 7 - 9; titanium pyrophosphate, 16 - 28; calcium phosphate compounds, the balance. Method comprises steps of anodizing implant by pulse electric current at condition of electric-spark discharge in phosphoric acid solution containing hydroxyapatite and calcium carbonate. Anodizing is realized by means of pulse current with next parameters: pulse time period, 50 - 200 ms; pulse repetition frequency 50 - 100 Hz; initial electric current density, 0.2 - 0.25 A/mm²; final voltage 100 -300 V. Invention allows to receive coating with thickness 40 - 80 micrometers.

EFFECT: possibility for forming coating whose composition is similar to that of osseous tissue with high content of calcium, improved osteoinductive and mechanical properties of coating.

7 cl, 3 ex