US4336618A
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
•
Filing: 1980-12-31
•
Granted: 1982-06-29
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Expires: 2000-12-31
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 20:34
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: 58
Claim 1
Independent Claim
91 words
A prosthesis comprising a prosthetic element and a polymethylmethacrylate film fixedly adhered to at least a portion of the surface of said prosthetic element; said prosthesis comprising a surface adapted to be fixedly attached to bone by means of bone cement; said prosthetic element bearing said polymethylmethacrylate film at least upon said attachment surface; said polymethylmethacrylate film being adhered to said prosthetic element by a process which comprises: treating said prosthetic element surface to eliminate any weak boundary layer; applying polymethylmethacrylate to said treated surface; and thereafter annealing said polymethylmethacrylate film.
Claim 2
Dependent Claim
91 words
A prosthesis comprising a prosthetic element and a polymethylmethacrylate film fixedly adhered to at least a portion of the surface of said prosthetic element; said prosthesis comprising a surface adapted to be fixedly attached to bone by means of bone cement; said prosthetic element bearing said polymethylmethacrylate film at least upon said attachment surface; said polymethylmethacrylate film being adhered to said prosthetic element by a process which comprises: treating said prosthetic element surface to eliminate any weak boundary layer; applying polymethylmethacrylate to said treated surface; and thereafter annealing said polymethylmethacrylate film.
Claim 3
Dependent Claim
15 words
A prosthesis in accordance with claim 1, wherein said prosthetic element is composed of metal.
Claim 4
Dependent Claim
36 words
A prosthesis 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 prosthesis 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 prosthesis 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 prosthesis 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 prosthesis in accordance with claim 6, wherein said alkaline compound comprises sodium hydroxide.
Claim 9
Dependent Claim
23 words
A prosthesis in accordance with claim 7, wherein said acid treatment comprises an acid etching treatment followed by a desmutting and passivation treatment.
Claim 10
Dependent Claim
41 words
A prosthesis 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
16 words
A prosthesis in accordance with claim 3, wherein said prosthetic element is composed of stainless steel.
Claim 12
Dependent Claim
16 words
A prosthesis in accordance with claim 3, wherein said prosthetic element is composed of cobalt-chromium-molybdenum alloy.
Claim 13
Dependent Claim
17 words
A prosthesis in accordance with claim 3, wherein said prosthetic element is composed of a titanium alloy.
Claim 14
Dependent Claim
19 words
A prosthesis in accordance with claim 1, wherein said prosthetic element is composed of ultra high molecular weight polyethylene.
Claim 15
Dependent Claim
20 words
A prosthesis in accordance with claim 13, wherein said treatment to eliminate said weak boundary layer comprises oxidizing said surface.
Claim 16
Dependent Claim
15 words
A prosthesis in accordance with claim 14, wherein said surface oxidation treatment comprises acid treatment.
Claim 17
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 18
Dependent Claim
15 words
A prosthesis in accordance with claim 16, wherein the solvent for said polymethylmethacrylate comprises dichloromethane.
Claim 19
Dependent Claim
14 words
A prosthesis in accordance with claim 17, wherein said solution additionally comprises barium sulfate.
Claim 20
Dependent Claim
29 words
A prosthesis in accordance with claim 16, wherein said annealing treatment comprises heating said prosthetic element bearing said film of polymethylmethacrylate to a temperature of greater than 80° C.
Claim 21
Dependent Claim
28 words
A prosthesis 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 22
Dependent Claim
15 words
A prosthesis in accordance with claim 20, wherein said prosthetic element is composed of metal.
Claim 23
Dependent Claim
19 words
A prosthesis in accordance with claim 20, wherein said prosthetic element is composed of ultra high molecular weight polyethylene.
Claim 24
Dependent Claim
12 words
A prosthesis in accordance with claim 1, comprising a bone implant prosthesis.
Claim 25
Dependent Claim
23 words
A prosthesis in accordance with claim 1 which has a structure adapted to be fixedly attached to an articular surface of a bone.
Claim 26
Dependent Claim
24 words
A prosthesis in accordance with claim 24, wherein said articular surface of said bone comprises the ball portion of a ball and socket joint.
Claim 27
Dependent Claim
19 words
A prosthesis in accordance with claim 1, wherein said polymethylmethacrylate layer has a thickness greater than about 0.0001 inch.
Claim 28
Dependent Claim
20 words
A prosthesis in accordance with claim 1 wherein said treatment to eliminate any weak boundary layer comprises a mechanical treatment.
Claim 29
Dependent Claim
16 words
A prosthesis in accordance with claim 27 wherein said mechanical treatment comprises blasting with alumina grit.
Claim 30
Dependent Claim
19 words
In combination, a prosthesis as defined in claim 1 fixedly adhered to a bone by bone cement comprising polymethylmethacrylate.
Claim 31
Dependent Claim
13 words
The combination of claim 29 wherein said prosthesis is a bone implant prosthesis.
Claim 32
Dependent Claim
17 words
The combination of claim 29 wherein said prosthesis is attached to an articular surface of said bone.
Claim 33
Dependent Claim
45 words
A process for preparing an improved prosthesis adapted to be joined to bone by means of bone cement which comprises: treating said prosthetic element surface to eliminate any weak boundary layer; applying a polymethylmethacrylate film to said treated surface; and thereafter annealing said polymethylmethacrylate film.
Claim 34
Dependent Claim
45 words
A process for preparing an improved prosthesis adapted to be joined to bone by means of bone cement which comprises: treating said prosthetic element surface to eliminate any weak boundary layer; applying a polymethylmethacrylate film to said treated surface; and thereafter annealing said polymethylmethacrylate film.
Claim 35
Dependent Claim
15 words
A process in accordance with claim 32, wherein said prosthetic element is composed of metal.
Claim 36
Dependent Claim
36 words
A process in accordance with claim 33 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 37
Dependent Claim
31 words
A process in accordance with claim 34, 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 38
Dependent Claim
24 words
A process in accordance with claim 35, wherein said degreasing treatment is carried out at a temperature of from about 200° to 220° F.
Claim 39
Dependent Claim
18 words
A process in accordance with claim 35, wherein said metal prosthetic element consists essentially of a cobalt-chromium-molybdenum alloy.
Claim 40
Dependent Claim
14 words
A process in accordance with claim 35, wherein said alkaline compound comprises sodium hydroxide.
Claim 41
Dependent Claim
23 words
A process in accordance with claim 35, wherein said acid treatment comprises an acid etching treatment followed by a desmutting and passivation treatment.
Claim 42
Dependent Claim
41 words
A process in accordance with claim 39, 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 43
Dependent Claim
19 words
A process in accordance with claim 32, wherein said prosthetic element is composed of ultra high molecular weight polyethylene.
Claim 44
Dependent Claim
20 words
A process in accordance with claim 41, wherein said treatment to eliminate said weak boundary layer comprises oxidizing said surface.
Claim 45
Dependent Claim
15 words
A process in accordance with claim 42 wherein said surface oxidation treatment comprises acid treatment.
Claim 46
Dependent Claim
32 words
A process in accordance with claim 32, 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 47
Dependent Claim
15 words
A process in accordance with claim 44, wherein the solvent for said polymethylmethacrylate comprises dichloromethane.
Claim 48
Dependent Claim
29 words
A process in accordance with claim 44, wherein said annealing treatment comprises heating said prosthetic element bearing said film of polymethylmethacrylate to a temperature of greater than 80° C.
Claim 49
Dependent Claim
28 words
A process in accordance with claim 32, wherein said annealing treatment comprises heating said prosthetic element bearing said polymethylmethacrylate film to a temperature of greater than 80° C.
Claim 50
Dependent Claim
15 words
A process in accordance with claim 32, wherein said prosthesis is a bone implant prosthesis.
Claim 51
Dependent Claim
25 words
A process in accordance with claim 32 wherein said prosthesis has a structure adapted to be fixedly attached to an articular surface of a bone.
Claim 52
Dependent Claim
19 words
A process in accordance with claim 32, wherein said polymethylmethacrylate layer has a thickness greater than about 0.0001 inch.
Claim 53
Dependent Claim
20 words
A process in accordance with claim 32, wherein said treatment to eliminate any weak boundary layer comprises a mechanical treatment.
Claim 54
Dependent Claim
16 words
A process in accordance with claim 51, wherein said mechanical treatment comprises blasting with alumina grit.
Claim 55
Dependent Claim
15 words
A prosthesis in accordance with claim 14 wherein said surface oxidation treatment comprises flame treatment.
Claim 56
Dependent Claim
16 words
A prosthesis in accordance with claim 14 wherein said surface oxidation comprises treatment by corona discharge.
Claim 57
Dependent Claim
15 words
A prosthesis in accordance with claim 42 wherein said surface oxidation treatment comprises flame treatment.
Claim 58
Dependent Claim
16 words
A prosthesis in accordance with claim 42 wherein said surface oxidation 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) | 1985-06-28 | 1985-12-28 | 1986-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-28 | 1989-12-28 | 1990-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-28 | 1993-12-28 | 1994-06-29 | $7700.00 | Window Closed / Lapsed |