Patent ID: 8778374

Claim:
A bone formation agent of porous pure-phase beta-tricalcium phosphate having an isotropic sintered structure and, between the sintered particles of the calcium phosphate, statistically distributed pores in a plurality of discrete size ranges, characterised in that the bone formation agent has a porosity composed of at least three discrete ranges of pore sizes (I) to (III), which are statistically distributed in terms of their size, and the maxima of the three discrete pore size distributions are at pore diameters in the ranges from 0.5 to 10 μm (I), 10 to 100 μm (II) and 100 to 5000 μm (III), the porosity has an irregular geometric shape, the sintered particles of the calcium phosphate have a particle size smaller than 63 μm with a d50 value in the range from 5 to 20 μm, the interconnecting pore share in the porosity is limited to pore sizes less than 10 μm, and said bone formation agent being in the form of a granulate where the maxima of the discrete pore size distributions (II) or (III) are less than half the average granulate size of a granulate fraction and are in a range between 10 and 50% of the average granulate size of the granulate fraction.