The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 29, 1989
Filed:
Feb. 13, 1987
Eugene W White, Rossiter, PA (US);
Interpore International, Irvine, CA (US);
Abstract
Calcium phosphates useful as bone substitute material or for the manufacture of prosthetic devices have been prepared from calcium hydroxyapatite material which has a uniformly permeable microporous structure characterized by a substantially uniform pore volume in the range from about 10 to about 90% and by a pronounced three-dimensional fenestrate structure corresponding to the microstructure of the porous carbonate echinoderm or scleractinian coral skeletal material of marine life by reacting said calcium hydroxyapatite material which has a calcium to phosphorus atomic ratio of about 1.66 with a phosphate-contributing or phosphorus-contributing moiety or with a calcium-contributing or calcium oxide-contributing moiety so as to alter the calcium to phosphorus Ca/P atomic ratio to yield a calcium phosphate material retaining the above-described microstructure of the porous carbonate echinoderm or scleractinian coral skeletal material but having a calcium to phosphorus Ca/P atomic ratio less than or greater than 1.6, such as a calcium phosphate material comprising dicalcium phosphate and/or tricalcium phosphate and having a calcium to phosphorus Ca/P atomic ratio in the range 1.0-1.5 when the calcium hydroxyapatite material is reacted with said phosphate-contributing or phosphorus-contributing moiety or a calcium phosphate material having a calcium to phosphorus Ca/P atomic ratio greater than 1.66 up to 2.0 when the calcium hydroxyapatite material is reacted with said calcium-contributing or calcium oxide-contributing moiety and comprising tetracalcium phosphate.