Support particles coated with or particles of precursors for or of biologically active glass
AssigneeE. I. Du Pont de Nemours and Company
InventorEdward G. Howard, Jr.
Life of this patent
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Abstract
An aqueous solution of precursors for biologically active glass, support particles coated with the solution, support particles coated with the glass, spheroidal particles of biologically active glass, processes for making the solution, coating the support, and for making the coated support and the spheroidal glass particles. The materials that comprise the biologically active glass are useful in prosthetic devices and implants for the human body.
Claims6
A method for making particles of biologically active glass comprising spray-drying an aqueous acid solution showing no substantial amount of precipitation in one hour consisting essentially of precursors that correspond to components of the glass and firing the spray-dried particles to convert the glass precursors to glass, the glass consisting essentially of the components:
- SiO.sub.2, 40 to 62 weight percent;
- Na.sub.2 O, 10 to 32 weight percent;
- CaO, 10 to 32 weight percent;
- CaF.sub.2, 0 to 18 weight percent;
- P.sub.2 O.sub.5, 0.1 to 12 weight percent;
- and
- B.sub.2 O.sub.3, 0 to 20 weight percent;
- wherein Na.sub.2 O and CaO taken together, are at least about 30 weight percent.
A spray-dried particle made from an aqueous acid solution showing no substantial amount of precipitation in one hour consisting essentially of biologically active glass precursors that correspond to components of a biologically active glass, the glass consisting essentially of the components:
- SiO.sub.2, 40 to 62 weight percent;
- Na.sub.2 O, 10 to 32 weight percent;
- CaO, 10 to 32 weight percent;
- CaF.sub.2, 0 to 18 weight percent;
- P.sub.2 O.sub.5, 0.1 to 12 weight percent;
- and
- B.sub.2 O.sub.3, 0 to 20 weight percent;
- wherein Na.sub.2 O and CaO taken together, are at least about 30 weight percent.
Dependencies are inferred from the claim text.