EP0193681A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Joint prostheses
Assignee: SSL CC Services Ltd
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Filing: 1985-12-20
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Granted: —
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Expires: 2005-12-20
Abstract
Abstract A joint prothesis comprises a first component (11), a second component (17) and a plastics sleeve (13) lying between the first and second components. The second component (17), together with the sleeve (13) is an interference fit within a blind bore in the first component (11), to key the first and second components together.
Inventors
- 👤 Martin Arthur Elloy
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 21:06
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3609; A61F2/30721; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30107; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30354; A61F2002/30474; A61F2002/365; A61F2210/00; A61F2210/0009; A61F2220/00; A61F2220/0025; A61F2220/0033
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
139 words
A prosthesis for replacing part of a natural j.o.int, said prosthesis comprising a first component (1) having a bearing surface for mating with a corresponding bearing surface of another part of the joint, a second component having at one end an elongated portion for fixing within a natural bone and having at the opposite end a substantially cylindrical (17) head for location within a substantially cylindrical blind bore (3) in the first component, and a third component comprising a plastics sleeve located within the bore to separate said first and second portions, characterised in that the prosthesis is arranged so that the three portions are held together, and relative rotation therebetween prevented, solely by deformation of the third component between said first and second components, said deformation acting to key the third component to the first and second components.
Claim 2
Dependent Claim
139 words
A prosthesis for replacing part of a natural j.o.int, said prosthesis comprising a first component (1) having a bearing surface for mating with a corresponding bearing surface of another part of the joint, a second component having at one end an elongated portion for fixing within a natural bone and having at the opposite end a substantially cylindrical (17) head for location within a substantially cylindrical blind bore (3) in the first component, and a third component comprising a plastics sleeve located within the bore to separate said first and second portions, characterised in that the prosthesis is arranged so that the three portions are held together, and relative rotation therebetween prevented, solely by deformation of the third component between said first and second components, said deformation acting to key the third component to the first and second components.
Claim 3
Dependent Claim
19 words
A prosthesis according to Claim 1 characterised in that the plastics sleeve (13) is less than 1000 microns thick.
Claim 4
Dependent Claim
62 words
A prosthesis according to Claim 1 or Claim 2 characterised in that the external diameter of the cylindrical head of the second component including the thickness of the plastics sleeve (13) is greater than the internal diameter of the blind bore (3) in the first component to provide an interference fit, the difference between the diameters being between 50 and 250 microns.
Claim 5
Dependent Claim
56 words
A prosthesis according to any of the preceding claims characterised in that the blind bore in the first component (1) is made only just deep enough to give an appropriate relationship with the line or lines of action of the applied load so as to give the maximum continuous section of material in the first component.
Claim 6
Dependent Claim
30 words
A prosthesis according to any of the preceding claims, characterised in that the third component (13) does not occupy the whole of the bore (3) in the first component (1).
Claim 7
Dependent Claim
37 words
A prosthesis according to Claim 5 characterised in that it is arranged so that the hydrostatic pressure generated during loading thereof is transmitted only to the deeper part of the internal surface of the first component (1).
Claim 8
Dependent Claim
27 words
A prosthesis according to claim 5 or Claim 6 characterised in that the plastics sleeve (13) terminates some distance short of the entrance to the bore (3).
Claim 9
Dependent Claim
19 words
A prosthesis according to Claim 5 or Claim 6 characterised in that the plastics sleeve is provided with recesses.
Claim 10
Dependent Claim
34 words
A prosthesis according to Claim 5 or Claim 6 characterised in that either or both of the first and second components have recesses (19) formed therein, said recesses opening out into the bore (3).
Claim 11
Dependent Claim
24 words
A prosthesis according to any of the preceding claims characterised in that the plastics sleeve (13) is made of ultra high molecular weight polyethelene.
Claim 12
Dependent Claim
24 words
A prosthesis according to any of the preceding claims characterised in that the plastics sleeve (13) is made of a cross-linked high density polyethelene.
References Cited (Backward Citations)
No citation records indexed.
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