Powder mixture for resorbable calcium phosphate biocements

Details Powder mixture for resorbable calcium phosphate biocements Powder mixture for resorbable calcium phosphate biocements

2007-05-29

2007-05-29

Richter, Johann (Department: 1616)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Particulate form

C424S422000, C424S423000, C424S426000, C424S484000, C424S602000, C424S688000, C424S692000, C424S724000

Reexamination Certificate

active

10689221

ABSTRACT:
The present invention relates to a powder mixture for resorbable calcium phosphate biocements, which mixture consists of 40–99% by volume of powder having a particle size of 0.1–10 μm, 1–20% by volume of powder having a particle size of 10–43 μm and 0–59% by volume of powder having a particle size of 43–315 μm, which powder is obtained by grinding the spontaneously crystallizing melts of a material comprising crystalline and X-ray amorphous phases, which materiala) according to31P-NMR measurements, contains Q0-groups of orthophosphate and Q1-groups of diphosphate, the orthophosphates or Q0-groups making up 65 to 99.9% by weight relative to the total phosphorus content of the powder mixture and the diphosphates or Q1-groups making up 0.1 to 35% by weight relative to the total phosphorus content of the powder mixture, andb) according to X-ray diffractometric measurements and relative to the total weight of the powder mixture, contains 35 to 99.9% by weight of a main crystal phase consisting of various Ca-orthophosphates and 0.1 to 20% by weight of a secondary crystal phase consisting of various Ca-diphosphates and chain phosphates, andc) besides the main crystal phase, contains an X-ray amorphous phase which in total makes up 0.1 to 65% by weight relative to the total weight of the powder mixture.

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Derwent-Acc-No. 1999-348171 Abstracting DE 19744809C1 Jul. 1, 1999.

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