METHOD FOR OBTAINING A BIORESORBABLE MATERIAL BASED ON MAGNESIUM AND HYDROXYAPATITE WITH A PROTECTIVE MULTICOMPONENT COATING Russian patent published in 2021 - IPC A61L27/00 A61L27/04 A61L27/40 A61L27/42 A61L27/54 A61L27/56 A61F2/02 C25D11/30 

FIELD: medical materials science.

SUBSTANCE: invention relates to the field of medical materials science and relates to bioresorbable materials. A method for producing a bioresorbable composite material with a low corrosion rate based on magnesium and hydroxyapatite is proposed. Powders of magnesium and hydroxyapatite when mixing are additionally dispersed by ultrasound, plasma electrolytic oxidation is carried out in an electrolyte containing Na₂SiO₃⋅5H₂O - 15 g/l, NaF - 5 g/l, with a frequency of polarizing pulses of 300 Hz, first for 200 s at a current density of 0.35 A/cm² on the anode component up to a voltage of 300-350 V, with a constant voltage on the cathode phase of -30 V, then within 600 s the anode component is changed to 200 V, and the cathodic component to -10 V. Next, a layer of polycaprolactone is applied either by drop centrifugation in two stages at a rotation speed of 400 rpm for 50 seconds, then at a speed of 4000 rpm for 60 seconds, or by impregnation with continuous stirring of the mixture in a vacuum at 0.7 atm.

EFFECT: obtaining a composite bioresorbable material of high density from magnesium and hydroxyapatite with a uniform distribution of the latter in the metal matrix, as well as with improved resistance to dissolution in physiological media due to the impregnation of the porous part of the PEO coating with polycaprolactone.

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