US4281420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bone connective prostheses adapted to maximize strength and durability of prostheses-bone cement interface; and methods of forming same
Assignee: SIRDAN RESEARCH Ltd Inc
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Filing: 1979-06-05
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Granted: 1981-08-04
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Expires: 1999-06-05
Abstract
Abstract There is disclosed a prosthesis comprising a prosthetic element and a polymethylmethacrylate film fixedly adhered thereto. The prosthesis comprises a surface adapted to be fixedly attached to bone and bears a polymethylmethacrylate film upon the attachment surface. The polymethylmethacrylate film is adhered to the prosthetic element by a process which comprises treating the prosthetic element surface to eliminate any weak boundary layer, applying polymethylmethacrylate to the treated surface, and thereafter annealing the polymethylmethacrylate film.
Inventors
- 👤 Simon Raab
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:29
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/3094; A61F2/30965; A61F2/30767; A61F2/32; A61F2/36; A61F2/3601; A61F2/3603; A61F2/38; A61F2/389; A61L; A61L27/00; A61L27/28; A61L27/34; A61F2/34; A61F2/3662; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30011; A61F2002/30014; A61F2002/30906; A61F2002/30925; A61F2002/30929; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2/46; A61F2002/4631; A61F2250/00; A61F2250/0014; A61F2250/0018; A61F2250/0023; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017; A61F2310/00023; A61F2310/00029; A61F2310/00389; A61F2310/00952; Y; Y10; Y10S; Y10S623/00; Y10S623/92; Y10S623/923; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24595; Y10T428/24942; Y10T428/24992; Y10T428/249921; Y10T428/249953; Y10T428/249955
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
58 words
A process comprising joining a prosthesis to bone by applying bone cement to a polymethylmethacrylate film fixedly adhered to a prosthetic element, said prosthesis having been prepared by the steps of: treating said prosthetic element to eliminate any weak boundary layer; applying polymethylmethacrylate to said treated surface to form a film thereon; and thereafter annealing said polymethylmethacrylate film.
Claim 2
Dependent Claim
58 words
A process comprising joining a prosthesis to bone by applying bone cement to a polymethylmethacrylate film fixedly adhered to a prosthetic element, said prosthesis having been prepared by the steps of: treating said prosthetic element to eliminate any weak boundary layer; applying polymethylmethacrylate to said treated surface to form a film thereon; and thereafter annealing said polymethylmethacrylate film.
Claim 3
Dependent Claim
15 words
A process in accordance with claim 1, wherein said prosthetic element is composed of metal.
Claim 4
Dependent Claim
36 words
A process in accordance with claim 2 wherein said treatment to eliminate said weak boundary layer comprises degreasing said metal prosthetic element with an alkaline reagent and thereafter treating said prosthetic element with an acidic reagent.
Claim 5
Dependent Claim
31 words
A process in accordance with claim 3, wherein said alkaline reagent comprises an aqueous solution of an alkaline compound and said acidic reagent comprises an aqueous solution of an acidic compound.
Claim 6
Dependent Claim
24 words
A process in accordance with claim 4, wherein said degreasing treatment is carried out at a temperature of from about 200° to 220° F.
Claim 7
Dependent Claim
18 words
A process in accordance with claim 4, wherein said metal prosthetic element consists essentially of a cobalt-chromium-molybdenum alloy.
Claim 8
Dependent Claim
14 words
A process in accordance with claim 4, wherein said alkaline compound comprises sodium hydroxide.
Claim 9
Dependent Claim
23 words
A process in accordance with claim 4, wherein said acid treatment comprises an acid etching treatment followed by a desmutting and passivation treatment.
Claim 10
Dependent Claim
41 words
A process in accordance with claim 8, wherein said acid etching treatment comprises treating said prosthetic element with sulfuric acid and wherein desmutting and passivation treatment comprises treating said prosthetic element with an aqueous admixture of hydrofluoric acid and nitric acid.
Claim 11
Dependent Claim
19 words
A process in accordance with claim 1, wherein said prosthetic element is composed of ultra high molecular weight polyethylene.
Claim 12
Dependent Claim
20 words
A process in accordance with claim 10, wherein said treatment to eliminate said weak boundary layer comprises oxidizing said surface.
Claim 13
Dependent Claim
15 words
A process in accordance with claim 11, wherein said surface oxidation treatment comprises acid treatment.
Claim 14
Dependent Claim
32 words
A process in accordance with claim 1, wherein said application of said polymethylmethacrylate film to said treated surface comprises providing a solution of polymethylmethacrylate and applying said solution to said treated surface.
Claim 15
Dependent Claim
15 words
A process in accordance with claim 13, wherein the solvent for said polymethylmethacrylate comprises dichloromethane.
Claim 16
Dependent Claim
29 words
A process in accordance with claim 13, wherein said annealing treatment comprises heating said prosthetic element bearing said film of polymethylmethacrylate to a temperature of greater than 80° C.
Claim 17
Dependent Claim
28 words
A process in accordance with claim 1, wherein said annealing treatment comprises heating said prosthetic element bearing said polymethylmethacrylate film to a temperature of greater than 80° C.
Claim 18
Dependent Claim
15 words
A process in accordance with claim 1, wherein said prosthesis is a bone implant prosthesis.
Claim 19
Dependent Claim
23 words
A process in accordance with claim 1, wherein said prosthesis is adapted to be fixedly attached to an articular surface of a bone.
Claim 20
Dependent Claim
19 words
A process in accordance with claim 1, wherein said polymethylmethacrylate layer has a thickness greater than about 0.0001 inch.
Claim 21
Dependent Claim
20 words
A process in accordance with claim 1, wherein said treatment to eliminate any weak boundary layer comprises a mechanical treatment.
Claim 22
Dependent Claim
16 words
A process in accordance with claim 20, wherein said mechanical treatment comprises blasting with alumina grit.
Claim 23
Dependent Claim
15 words
A process in accordance with claim 11 wherein said surface oxidation treatment comprises flame treatment.
Claim 24
Dependent Claim
17 words
A process in accordance with claim 11 wherein said surface oxidation treatment comprises treatment by corona discharge.
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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) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |