Process for the preparation of a biomimetic bone substitute and its uses
First Claim
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1. A process for the preparation of a biomimetic bone substitute comprising:
- (a) providing a preformed solid three-dimensional porous scaffold comprising hydroxyapatite or carbonate-hydroxyapatite;
(b) contacting extracorporeally said scaffold with a saline aqueous solution containing an effective concentration of Mg2+ ions at a pressure greater than or equal to 1 bar, whereby during said contacting step Ca2+ ions in the scaffold are substituted with Mg2+ ions and the concentration of Mg2+ ions in the scaffold is increased; and
(c) obtaining a biomimetic bone substitute comprising magnesium-hydroxyapatite or magnesium-carbonate-hydroxyapatite having a content of Mg2+ ions in the range of 0.2% to 1.5% by weight and a total porosity of 50% to 90% by volume, with respect to the total volume of the bone substitute, wherein both the total porosity and the porosity distribution of the bone substitute is the same as the total porosity and the porosity distribution of said three-dimensional porous scaffold.
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Abstract
The object of the present invention is a process for obtaining a bone substitute of given chemical and physical characteristics and entirely similar to those of the mineral portion of natural bone tissue. The process substitutes Ca ions with Mg ions in a porous matrix; the process comprises a phase of contacting the matrix with a saline aqueous solution containing an effective quantity of Mg ions at a pressure greater than or equal to 1 bar.
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Citations
16 Claims
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1. A process for the preparation of a biomimetic bone substitute comprising:
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(a) providing a preformed solid three-dimensional porous scaffold comprising hydroxyapatite or carbonate-hydroxyapatite; (b) contacting extracorporeally said scaffold with a saline aqueous solution containing an effective concentration of Mg2+ ions at a pressure greater than or equal to 1 bar, whereby during said contacting step Ca2+ ions in the scaffold are substituted with Mg2+ ions and the concentration of Mg2+ ions in the scaffold is increased; and (c) obtaining a biomimetic bone substitute comprising magnesium-hydroxyapatite or magnesium-carbonate-hydroxyapatite having a content of Mg2+ ions in the range of 0.2% to 1.5% by weight and a total porosity of 50% to 90% by volume, with respect to the total volume of the bone substitute, wherein both the total porosity and the porosity distribution of the bone substitute is the same as the total porosity and the porosity distribution of said three-dimensional porous scaffold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification