METHOD OF MODIFYING SURFACE OF IMPLANTS FROM TITANIUM AND ITS ALLOYS Russian patent published in 2010 - IPC A61L27/06 A61L27/32 

FIELD: medicine.

SUBSTANCE: described method of modifying surface of implants from titanium and its alloys relates to electrochemical application of biocompatible hydroxyapatite-based coatings on implants from titanium and its alloys for use in traumatology, orthopedics and dentistry. Products are placed into water solution of alkali electrolyte, additionally containing hydroxyapatite within the range 0.1-1.5 wt %. Formation of coating is carried out in galvanostatic mode with current value ensuring obtaining of final value of anode voltage 370 V during 15 minutes. Duration of anode and cathode pulses - 150 mcs, repetition rate 100 Hz and pause between anode and cathode pulses 350 mcs. Ratio of average values of anode and cathode currents for a pulse 1a/1c c equals 1. Method allows to obtain 14±2 mcm thick coating with preliminarily specified microhardness within 150-300 MPa, for which purpose required concentration of hydroxyapatite in electrolyte is determined basing on the formula: T=312-117·C, where T is the value of microhardness HV_0.1 [MPa], C - hydroxyapatite concentration [wt %] in water solution of 2% KOH.

EFFECT: method allows to regulate physico-mechanical, including strength characteristics of calcium-phosphate coatings.

3 cl, 3 ex, 1 dwg