US4722870A
Expired / Lapsed
US
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Metal-ceramic composite material useful for implant devices
Assignee: Interpore International Inc
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Filing: 1985-01-22
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Granted: 1988-02-02
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Expires: 2005-01-22
Abstract
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.
Inventors
- 👤 Eugene W. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:32
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/50; A61L27/56; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61L27/02; A61L27/04; A61L27/12; A61L27/54; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
46 words
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.
Claim 2
Dependent Claim
46 words
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.
Claim 3
Dependent Claim
14 words
A material in accordance with claim 1 in which said calcium phosphate is hydroxyapatite.
Claim 4
Dependent Claim
19 words
A material is accordance with claim 1 in which said calcium phosphate is a mixture of hydroxyapatite and whitlockite.
Claim 5
Dependent Claim
14 words
A material in accordance with claim 1 in which said calcium phosphate is whitelockite.
Claim 6
Dependent Claim
25 words
A material in accordance with claim 1 in which said metal is an alloy comprising about 56% cobalt, about 35% chromium, and about 5% molybdenum.
Claim 7
Dependent Claim
14 words
A material in accordance with claim 1 in which said metal is stainless steel.
Claim 8
Dependent Claim
15 words
A material in accordance with claim 1 in which said metal is a cobalt alloy.
Claim 9
Dependent Claim
15 words
A material in accordance with claim 1 in which said metal is a titanium alloy.
Claim 10
Dependent Claim
15 words
A material in accordance with claim 1 in which said metal is a silver alloy.
Claim 11
Dependent Claim
15 words
A material in accordance with claim 1 in which said metal is a gold alloy.
Claim 12
Dependent Claim
49 words
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.
Claim 13
Dependent Claim
49 words
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.
Claim 14
Dependent Claim
40 words
A material in accordance with claim 11 in which said metal is selected from the group stainless steel, titanium alloy, cobalt alloy, an alloy comprising abut 65% cobalt, about 35% chromium, and about 5% molybdenum, silver alloy and gold alloy.
Claim 15
Dependent Claim
54 words
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.
Claim 16
Dependent Claim
54 words
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.
Claim 17
Dependent Claim
39 words
The material according to claim 13 in which said metal is selected from the group stainless steel, titanium alloy, cobalt alloy, an alloy comprising abut 65% cobalt, about 35% chromium, and about 5% molybdenum, silver alloy and gold alloy.
Claim 18
Dependent Claim
49 words
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.
Claim 19
Dependent Claim
49 words
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.
Claim 20
Dependent Claim
39 words
The material according to claim 15 in which said metal is selected from the group stainless steel, titanium alloy, cobalt alloy, an alloy comprising about 65% cobalt, about 35% chromium, and about 5% molybdenum, silver alloy and gold alloy.
Claim 21
Dependent Claim
39 words
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.
Claim 22
Dependent Claim
39 words
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.
Claim 23
Dependent Claim
51 words
A material in accordance with claim 17 in which the calcium phosphate of said calcium phosphate investment is hydroxyapatite and said metal is selected from the group stainless steel, titanium alloy, cobalt alloy, an alloy comprising about 65% cobalt, about 35% chromium, and about 5% molybdenum, silver alloy and gold alloy.
Claim 24
Dependent Claim
53 words
A material in accordance with claim 17 in which the calcium phosphate of said calcium phosphate investment is a hydroxyapatite/whitlockite mixture and said metal is selected from the group stainless steel, titanium alloy, cobalt alloy, an alloy comprising about 65% cobalt, about 35% chromium, and about 5% molybdenum, silver alloy and gold alloy.
Claim 25
Dependent Claim
46 words
A material in accordance with claim 17 in which the calcium phosphate investment is whitlockite and said metal is selected from the group stainless steel, titanium alloy, cobalt alloy, an alloy comprising 65% cobalt, about 35% chromium, and about 5% molybdenum, silver alloy and gold alloy.
Claim 26
Dependent Claim
51 words
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.
Claim 27
Dependent Claim
51 words
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.
Claim 28
Dependent Claim
49 words
An implantable surgical or dental prosthesis in accordance with claim 21 in which said calcium phosphate is hydroxyapatite and said metal is selected from the group stainless steel, titanium alloy, cobalt alloy, an alloy comprising 65% cobalt, about 35% chromium, and about 5% molybdenum, silver alloy and gold alloy.
Claim 29
Dependent Claim
45 words
An implantable surgical or dental prosthesis according to claim 22, in which said composite material forms only part of said prosthesis and is present at locations where bone fixation is desired, said composite material being exposed at the surface of said prosthesis at said locations.
Claim 30
Dependent Claim
53 words
An implantable surgical or dental prosthesis in accordance with claim 21 in which said calcium phosphate is a hydroxyapatite/whitlockite mixture and said metal is selected from the group stainless steel, titanium alloy, cobalt alloy, an alloy comprising about 65% of cobalt, about 35% chromium, and about 5% molybdenum, silver alloy and gold alloy.
Claim 31
Dependent Claim
45 words
An implantable surgical or dental prosthesis according to claim 24, in which said composite material forms only part of said prosthesis and is present at locations where bone fixation is desired, said composite material being exposed at the surface of said prosthesis at said locations.
Claim 32
Dependent Claim
49 words
An implantable surgical or dental prosthesis in accordance with claim 21 in which said calcium phosphate is whitlockite and said metal is selected from the group stainless steel, titanium alloy, cobalt alloy, an alloy comprising about 65% cobalt, 35% chromium, and about 5% molybdenum, silver alloy and gold alloy.
Claim 33
Dependent Claim
45 words
An implantable surgical or dental prosthesis according to claim 21, in which said composite material forms only part of said prosthesis and is present at locations where bone fixation is desired, said composite material being exposed at the surface of said prosthesis at said locations.
Claim 34
Dependent Claim
45 words
An implantable surgical or dental prosthesis according to claim 27, in which said composite material forms only part of said prosthesis and is present at locations where bone fixation is desired, said composite material being exposed at the surface of said prosthesis at said locations.
Claim 35
Dependent Claim
36 words
An implantable surgical or dental prosthesis according to claim 27 in which the surface of said composite material, exposed at said locations where bone fixation is desired, is pitted through selective removal of said calcium phosphate.
Claim 36
Dependent Claim
36 words
An implantable surgical or dental prosthesis according to claim 21 in which the surface of said composite material, exposed at said locations were bond fixation is desired, is pitted through selected removal of said calcium phosphate.
Claim 37
Dependent Claim
72 words
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.
Claim 38
Dependent Claim
72 words
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.
Claim 39
Dependent Claim
59 words
The process according to claim 31 in which the step of finishing comprises the steps of placing, prior to casting, a fine powder resistant to the heat of casting in said porosity of said calcium phosphate investment at a selected surface thereof, to a selected depth from said surface and removing said powder after the solidification of said metal.
Claim 40
Dependent Claim
15 words
The process according to claim 32 in which said fine powder is calcium oxide powder.
Claim 41
Dependent Claim
83 words
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.
Claim 42
Dependent Claim
83 words
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.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |