US3707006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Orthopedic device for repair or replacement of bone
Assignee: Gulf Oil Corp
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Filing: 1970-08-26
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Granted: 1972-12-26
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Expires: 1990-08-26
Abstract
Abstract Prosthetic devices for repair of replacement of bone structure in a living body, and methods of orthopedic repair which employ such devices. The orthopedic devices comprise a substrate and a pyrolytic carbon coating on the substrate, which pyrolytic carbon coating is compatible with living tissue and which has a density of at least about 1.5 grams per cubic centimeter. Examples of suitable substrates are those which have a modulus of elasticity approximating that of natural bone such as polycrystalline carbon, and fiber aggregates such as carbon fiber aggregates and refractory wire metal screens. The pyrolytic carbon coating of the orthopedic devices may be polished to provide an effective wear surface, while the surface roughness of the as-deposited coating may be employed to achieve a bond with natural bone tissue. The pyrolytic carbon coating is preferably isotropic and may be doped with a suitable carbide-forming element, such as silicon, to provide additional structural strength and wear resistance.
Inventors
- 👤 Jack C Bokros
- 👤 Willard H Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:30
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/02; A61L27/08; A61C; A61C8/00; A61C8/0012; A61C8/0013; A61F; A61F2/00; A61F2/02; A61F2/28; A61F2/30; A61F2/30767; A61F2/3094; A61F2/30965; A61F2/32; A61F2/36; A61F2/3609; A61F2/38; A61F2/3662; A61F2/367; A61F2/3676; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30069; A61F2002/3007; A61F2002/30084; A61F2002/30108; A61F2002/3011; A61F2002/30138; A61F2002/30153; A61F2002/30199; A61F2002/30291; A61F2002/30293; A61F2002/30316; A61F2002/30329; A61F2002/30448; A61F2002/30474; A61F2002/30535; A61F2002/30563; A61F2002/30589; A61F2/30771; A61F2002/3082; A61F2002/30827; A61F2002/30828; A61F2002/30831; A61F2002/30878; A61F2002/30891; A61F2002/30892; A61F2002/30934; A61F2002/3241; A61F2002/3611; A61F2002/3625; A61F2002/3631; A61F2002/365; A61F2/3672; A61F2002/3674; A61F2220/00; A61F2220/0025; A61F2220/005; A61F2230/00; A61F2230/0002; A61F2230/0017; A61F2230/0019; A61F2230/0063; A61F2230/0091; A61F2310/00; A61F2310/00005; A61F2310/00161; A61F2310/00173; A61F2310/00389; A61F2310/00574
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
38 words
A prosthetic device according to claim 1 wherein the prosthesis is a framework prosthesis adapted to provide sufficient access to nutrients for the growth of living bone tissue therethrough, and wherein said substrate is a fiber aggregate form.
Claim 2
Dependent Claim
27 words
A prosthetic device according to claim 2 wherein said substrate is made of refractory metal selected from the group consisting of tungsten, tantalum, molybdenum, and alloys thereof.
Claim 3
Dependent Claim
15 words
A prosthetic device according to claim 2 wherein said substrate is made of carbon fiber.
Claim 4
Dependent Claim
29 words
A prosthetic device according to claim 1 wherein said substrate has a thermal coefficient of expansion of from about 3 X 10 6/*C. to about 8 X 10 6/*C.
Claim 5
Dependent Claim
28 words
A prosthetic device according to claim 5 wherein the substrate has a modulus of elasticity of between about 1 X 106 psi. to about 5 X 106 psi.
Claim 6
Dependent Claim
47 words
A prosthetic device according to claim 6 wherein the substrate is artificial graphite having a modulus of elasticity between about 1.7 X 106 psi. and about 4 X 106 psi. such that the pyrolytic carbon coated substrate has a modulus of elasticity approximating that of natural bone.
Claim 7
Dependent Claim
43 words
A prosthetic device according to claim 7 wherein said substrate is isotropic polycrystalline graphite having an average crystallite size of about 300 A, a density of about 1.9 grams per cubic centimeter, and a modulus of elasticity of about 1.7 X 106 psi.
Claim 8
Dependent Claim
24 words
A prosthesis according to claim 7 wherein said density of said pyrolytic carbon coating is between about 1.9 and about 2.2 grams per cm3.
Claim 9
Dependent Claim
42 words
A prosthetic device according to claim 7 wherein said device is a joint prosthesis having a bone-joining surface and an articulating wear surface, and wherein the pyrolytic carbon coating on the wear surface is polished to reduce friction and improve wear characteristics
Claim 10
Dependent Claim
28 words
A prosthetic device according to claim 10 wherein the bone-joining surface has at least one projection adapted to fit in interlocking relationship with a mating, natural bone surface.
Claim 11
Dependent Claim
69 words
A prosthetic device according to claim 7 wherein the prosthetic device is a dental prosthesis having a base portion adapted to be inserted into a jawbone, an abutment for attaching a tooth or other denture, and an intermediate portion between the abutment and base portion of sufficient length such that upon insertion the abutment protrudes the proper distance from the jawbone for attachment of the tooth or other denture.
Claim 12
Dependent Claim
27 words
A dental prosthesis according to claim 12 wherein the base portion of the prosthesis is formed with indentations penetrating through the pyrolytic carbon coating into the substrate.
Claim 13
Dependent Claim
31 words
A prosthetic device according to claim 1 wherein the surface of said pyrolytic carbon coating is provided with oxygen-bearing polar groups to enhance the attachment of bone or other tissue thereto.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |