Method for producing porous calcium deficient hydroxyapatite granules
US10807869B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 4, 2018 |
| Grant date | Oct 20, 2020 |
| Priority date | — |
| Expiry date | Jan 18, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/16
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The method is for producing porous calcium deficient hydroxyapatite granules and comprises the following steps: (a) subjecting granules of calcium sulfate anhydrous (CSA), calcium sulfate dihydrate (CSD) or calcium sulfate hemihydrate (CSH) to an incubation in an alkaline aqueous solution having a pH-value of less than 10 and containing PO43− ions; whereby the granules of calcium sulfate anhydrous (CSA), calcium sulfate dihydrate (CSD) or calcium sulfate hemihydrate (CSH) comprise interconnected pores with a minimum mean diameter of 3 microns; (b) washing with water the granules obtained after incubation of step a); (c) drying the obtained porous granules of calcium deficient hydroxyapatite; whereby (d) the amount-of PO43− ions present in the incubation of step a) is at least as large as the amount of SO42− ions of the granules used for step (a). The porous calcium deficient hydroxyapatite granules obtained by the invention may be purposefully used as carriers for biologically active substances in particular for proteins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.