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US 2007/0022912 A1Published application
Magnesium Ammonium Phosphate Cement Composition
AssigneeKyphon Inc.
InventorMichael Zimmermann
Life of this patent
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Abstract
This invention relates to a cement, which comprises in its main phase of microcrystalline magnesium ammonium phosphate and nanoapatite after hardening and thus at the same time has considerable strength. The material is biologically degradable and is suitable for application in tooth cements, as bone replacement, as bone filler, as bone cement or as bone adhesive.
Claims42
A magnesium ammonium phosphate cement preparation comprising:
- a powder mixture having calcium (Ca), molar quantities of the components magnesium (Mg) and phosphate (P) in the mixture in the range Mg/P<1.0;
- and an ammonium salt.
A porous magnesium ammonium phosphate cement preparation comprising:
- a powder mixture having the components calcium (Ca), magnesium (Mg), phosphate (P), an ammonium salt and granular particles, wherein the granular particles are configured to leach from a hardened cement structure formed from the cement preparation, leaving the hardened cement structure porous.
A magnesium ammonium phosphate cement preparation comprising:
- a powder mixture having molar quantities of the components calcium (Ca), magnesium (Mg) and phosphate (P) in the mixture in the ranges 1<Ca/P<1.5 and Mg/P<1.0;
- and an ammonium and/or a strontium salt, wherein the cement preparation when hardened forms a bone replacement material that stimulates endogenous bone transformation processes and allows for active resorption of the bone replacement material.
Dependencies are inferred from the claim text.