EP0144209A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Endoprosthetic bone joint components
Assignee: National Research Development Corp UK
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Filing: 1984-11-28
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Granted: —
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Expires: 2004-11-28
Abstract
Abstract An endoprosthetic bone component is produced from parts (10, 20) respectively having a projection (12) and cavity (21) engageable in a mutual clearance fit, and a third part (30) of plastics material located in the space of such fit, the space and third part being dimensioned to inhibit ejection of the latter and to lock the two parts against mutual articulation during post-operative use. Normally the space and third part will be of generally uniform thickness overall which is small compared to that of the projection. Also the projection and cavity are preferably of uniform cross-sectional shape over at least major portions thereof. Typically the two parts will be of different materials, such as ceramic and metal, suited rescectively to articulation and bone fixation roles.
Inventors
- 👤 Barry Oliver Weightman
- 👤 Robert Alan Wordsworth
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 03:54
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3609; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30113; A61F2002/30121; A61F2002/30125; A61F2002/30138; A61F2002/30153; A61F2002/30156; A61F2002/30182; A61F2002/30187; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30354; A61F2002/30355; A61F2002/30362; A61F2002/30364; A61F2002/30367; A61F2002/30474; A61F2/30767; A61F2/30771; A61F2002/30795; A61F2002/308; A61F2002/3625; A61F2002/3631; A61F2002/3647; A61F2002/365; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0006; A61F2230/0008; A61F2230/0017; A61F2230/0019; A61F2230/0023; A61F2230/0028; A61F2230/0034
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
A method of producing an endoprosthetic bone component, comprising: providing two parts of material substantially non-deformable under body load; forming one of said parts with a cavity, and the other of said parts with a projection, said cavity and projection being engageable with a space therebetween in a mutual clearance fit; providing a third part of plastics material to fill said space; and assembling said component by engaging said cavity and projection and locating said third part in said space; said cavity and third part being dimensioned to inhibit ejection of the material of the latter from the former, and also to lock said two parts against mutal articulation, during post-operative use of said component.
Claim 2
Independent Claim
115 words
A method of producing an endoprosthetic bone component, comprising: providing two parts of material substantially non-deformable under body load; forming one of said parts with a cavity, and the other of said parts with a projection, said cavity and projection being engageable with a space therebetween in a mutual clearance fit; providing a third part of plastics material to fill said space; and assembling said component by engaging said cavity and projection and locating said third part in said space; said cavity and third part being dimensioned to inhibit ejection of the material of the latter from the former, and also to lock said two parts against mutal articulation, during post-operative use of said component.
Claim 3
Dependent Claim
23 words
A method according to Claim 1 wherein said third part is preformed, and assembly of said component is by push-fitting all said parts.
Claim 4
Dependent Claim
17 words
A method according to Claim 1 wherein said third part is formed in situ in said space.
Claim 5
Dependent Claim
32 words
An endoprosthetic bone component produced in accordance with Claim 1 wherein said space and third part are of generally uniform thickness overall, which thickness is small relative to that of said projection.
Claim 6
Dependent Claim
32 words
A component according to Claim 4 wherein said cavity and projection are of similar shapes having substantially uniform transverse cross-section respectively along at least corresponding major portions of their depth and length.
Claim 7
Dependent Claim
11 words
A component according to Claim 5 wherein said cross-section is non-circular.
Claim 8
Dependent Claim
47 words
A component according to Claim 4, 5 or 6 wherein said two parts are respectively adapted for fixation in said bone and formed to define an articulation surface for said bone, said parts being of respectively different materials selected to suit the associated fixation and articulation roles.
Claim 9
Dependent Claim
26 words
A component according to any one of Claims 4 to 7 wherein said one part is of ceramic, the surface of said cavity being as fired.
Claim 10
Dependent Claim
46 words
A component according to any one of Claims 4 to 8 wherein said third part thickness is about 0.5 mm for a projection thickness of about 15 mm, with the former thickness being respectively decreased and increased generally proportionately with the latter for a different size.
Claim 11
Dependent Claim
52 words
A component according to any one of Claims 4 to 9 wherein said one part is of ball form defining an articulation surface for said bone, and said second part is of generally elongate tapered form adapted for fixation in said bone and having said projection from the wider end portion thereof.
Claim 12
Dependent Claim
21 words
A set pf parts for producing a component in accordance with Claim 2 and any one of Claims 4 to 10.
References Cited (Backward Citations)
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