Metal-ceramic composite material useful for implant devices
First Claim
1. A synthetic composite material, the structure of which is characterized by two interpenetrating three-dimensional regions, each of said regions being a single, multiply interconnected domain, one of said regions being composed of a metal and the other of said regions being composed of a calcium phosphate.
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Abstract
A material useful as a biomaterial for the manufacture of prosthetic devices and the like is provided by casting a suitable metal, such a Vitallium, into a hydroxyapatite and/or whitlockite investment with three-dimensional interconnected porosity. The resulting composite is finished to expose the investment in order to provide a superior surface for attachment to bone. The composite may be cast as part of the casting of metal prostheses such as hip joints or artificial teeth, in such a way that the investment is present in a thin layer at the desired bone attachment locations.
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Citations
34 Claims
- 1. A synthetic composite material, the structure of which is characterized by two interpenetrating three-dimensional regions, each of said regions being a single, multiply interconnected domain, one of said regions being composed of a metal and the other of said regions being composed of a calcium phosphate.
- 11. A synthetic composite material useful as a biomaterial, the structure of which is characterized by two interpenetrating three-dimensional regions, each of said regions being a single multiple interconnected domain, one of said regions being composed of hydroxyapatite and the other of said regions being composed of a biocompatible metal.
- 13. A synthetic composite material useful as a biomaterial, the structure of which is characterized by two interpenetrating three-dimensional regions, each of said regions being a single multiply interconnected domain, one of said regions being composed of a mixture of hydroxyapatite and whitlockite, and the other of said regions being composed of a biocompatible metal.
- 15. A synthetic composite material useful as a biomaterial, the structure of which is characterized by two interpenetrating three-dimensional regions, each of said regions being a single multiply interconnected domain, one of said regions being composed of whitlockite, and the other of said regions being composed of a biocompatible metal.
- 17. A synthetic composite material useful as a biomaterial formed by the casting of a metal into a calcium phosphate investment, said calcium phosphate investment being characterized by a three-dimensional interconnected porosity and by being a single multiply interconnected domain.
- 21. An implantable surgical or dental prosthesis composed of a synthetic composite material, the structure of said composite material being characterized by two interpenetrating three-dimensional regions, each of said regions being a single multiple interconnected domain, one of said regions being composed of a calcium phosphate and the other of a metal.
- 31. The process which comprises the steps of preparing a calcium phosphate investment for casting, said calcium phosphate investment having a three-dimensional, interconnected porosity and comprising a single multiply interconnected domain, casting molten metal into said investment, and allowing said metal to solidify so that a metal/calcium phosphate composite material results, and finishing a surface of said resulting metal/calcium phosphate composite material so that said calcium phosphate investment is exposed at said surface.
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34. The process which comprises the steps of preparing a calcium phosphate investment for casting, said calcium phosphate investment having a three-dimensional interconnected porosity and comprising a single multiply interconnected domain, casting molten metal into said investment, allowing said metal to solidify so that a metal/calcium phosphate composite material results, finishing a surface of the resulting metal/calcium phosphate composite material so that said calcium phosphate investment is exposed at said surface, and pitting said surface through selective removal of said exposed calcium phosphate investment.
Specification