Method for fabrication of highly porous, calcium phosphate bioactive implant material

摘要

The present invention solves the problem of manufacturing bioactive implant material showing particular properties.;In the method according to the invention, the suspension of gelatinous amorphous calcium phosphate synthesized previously by the wet method at Ca/P molar ratio within the range 1.45-1.75 with optional addition of ionic modifiers, preferably CO₃^2-, Mg²⁺, Mn²⁺, is subjected to aging and sedimentation processes, after which it is decanted and concentrated to the precipitate containing 75-82% of water. The filter cake thus obtained is dried at the temperature of 70-100°C until constant mass, then subjected to mechanical working followed by calcination of the semi-final product obtained at 400-1000°C for 1-5 hours which results in a microporous, mono- or two-phase material of unimodal pore size distribution in the range of 0.05-0.5 µm in the form of granules or shaped articles. In order to obtain granules, the filter cake after drying is crushed into fractions of grain sizes within 0.1-2 mm using appropriate sieves and calcined, whereas in order to obtain shaped implant articles the cake after drying is processed appropriately to get the desired shape and calcined.