US3918100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sputtering of bone on prostheses
Assignee: United States Department of the Navy
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Filing: 1974-05-13
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Granted: 1975-11-11
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Expires: 1994-05-13
Abstract
Abstract A system of coating prostheses with ground bone particles is presented. Prostheses made of various metals and other substances are coated using rf sputtering techniques to form a film which adheres to the device, stimulates living bone attachment thereto and which is ultimately replaced by new bone. Beef cattle bone material, some ground to 125 mesh and the remainder in chunks, has been successfully used in one embodiment as the coating applied by the rf sputtering process.
Inventors
- 👤 Bevil J Shaw
- 👤 Richard P Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:58
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/36; A61L27/3641; A61L27/3645; A61L27/365; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61L27/3604; A61L27/3608; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017; A61F2310/00023; A61F2310/00029; A61F2310/00389; A61F2310/00958; Y; Y10; Y10S; Y10S623/00; Y10S623/92; Y10S623/923
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
59 words
A prosthesis for use as a bone implant comprising: a metallic base conforming to the shape of the bone to be replaced; and a coating of bone material impinged upon and adhered to said prosthesis by rf sputtering, whereby said bone material will induce living bone growth around the implant and, additionally, will eliminate the necessity for bone grafting.
Claim 2
Dependent Claim
59 words
A prosthesis for use as a bone implant comprising: a metallic base conforming to the shape of the bone to be replaced; and a coating of bone material impinged upon and adhered to said prosthesis by rf sputtering, whereby said bone material will induce living bone growth around the implant and, additionally, will eliminate the necessity for bone grafting.
Claim 3
Dependent Claim
40 words
The prosthesis as defined in claim 1 wherein the material of said metallic base is selected from the non-toxic group consisting of stainless steel, cobalt-chromium-molybdenum alloy, titanium and titanium alloys and said coating is formed by an rf sputtering process.
Claim 4
Dependent Claim
29 words
The prosthesis as defined in claim 2 wherein the bone implant is presputtered for substantially 40 minutes at a power density on the order of 1.63 watts per cm2.
Claim 5
Dependent Claim
39 words
The prosthesis as defined in claim 3 wherein sputtering is conducted at power densities to the target in the range of from 0.19 watts per cm2 to 0.81 watts per cm2 to avoid thermal decomposition of the bone particles.
Claim 6
Dependent Claim
62 words
The prosthesis as defined in claim 4 wherein said bone material forming said coating is animal bone ground in part to a 125 mesh and in part in pieces of substantially greater size, said bone material baked at substantially 125*C for substantially 18 hours prior to presputtering to evaporate moisture from the bone, said coating having a thickness of substantially 1 micron.
Claim 7
Independent Claim
22 words
A method of forming a bone replacement or bone repair prosthesis comprising adhering bone particles to a prosthetic form by rf sputtering.
Claim 8
Independent Claim
22 words
A method of forming a bone replacement or bone repair prosthesis comprising adhering bone particles to a prosthetic form by rf sputtering.
Claim 9
Dependent Claim
30 words
The method of claim 6 wherein the prosthetic form is positioned at the cathode of the rf sputtering means at a distance of substantially 2 inches from the anode thereof.
Claim 10
Dependent Claim
38 words
The method of claim 7 wherein the sputtering is conducted at power densities to the target in the range of from 0.19 watts per cm2 to 0.81 watts per cm2 to avoid thermal decomposition of the bone particles.
Claim 11
Dependent Claim
25 words
The method of claim 8 wherein the prosthetic form is presputtered for substantially 40 minutes at a power density of substantially 1.63 watts per cm2.
Claim 12
Dependent Claim
35 words
The method of claim 9 wherein sputtering is performed at an operating pressure of substantially 3.5 X 10 3 mm Hg and said bone particles are applied to a coating thickness of substantially 1 micron.
Claim 13
Dependent Claim
46 words
The method of claim 10 wherein the bone particles are derived from ground animal bone having a consistency in part of substantially 125 mesh and in part of substantially larger pieces, said bone particles baked at substantially 125*C for substantially 18 hours to evaporate moisture therefrom.
Claim 14
Dependent Claim
36 words
The method of claim 10 wherein the bone particles are obtained by machining bone chips to a powder form and heating the powder to substantially 120*C for substantially 60 hours to remove moisture and gases therefrom.
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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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |