Method for preparing a calcium phosphate pasty material for...

A - Human Necessities – 61 – L

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A61L 27/46 (2006.01) A61L 24/00 (2006.01) A61L 27/12 (2006.01)

Patent

CA 2401573

The invention concerns a method for preparing a calcium phosphate pasty material for injection which after, setting, is designed to form an apatite material. Said method consists in: producing from water and calcium phosphates pasty mixture capable of developing, hardening and forming a hydroxyapatite. Said method is characterised in that it consists in adding to the calcic phosphates or to the pasty mixture before it is injected a methicone having relative to the mixture more than 0.30 wt. % and less than 10 wt. %. The resulting material can be injected, that is it can be transported in pasty form into a conduit under moderate pressure levels. Said material sets on the site of implantation and hardens to form an apatite biomaterial in a manner similar to known methicone-free calcium phosphate mixtures.

L'invention concerne un procédé de préparation d'un matériau pâteux phosphocalcique injectable appelé, après durcissement, à former un matériau apatitique. Ce procédé, du type dans lequel on réalise à partir d'eau et de phospates calciques un mélange pâteux apte à évoluer, durcir et former une hydroxyapatite, se caractérisé en ce qu'on ajoute aux phosphates calciques ou au mélange pâteux avant son injection un méthicone en proportion pondérale par rapport au mélange supérieure à 0,30% et inférieure à 10%. Le matériau pâteux obtenu est injectable, c'est à dire qu'il peut être transporté sous forme pâteuse dans un conduit sous des pressions modérées. Ce matériau fait prise sur le site d'implantation et durcit pour former un biomatériau apatitique de façon similaire aux mélanges phosphocalciques connus ne contenant pas de méthicone.

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