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EP0681845A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Polymer composite implant and method of making the same

Assignee: Bristol Myers Squibb Co
•
Filing: 1995-04-10
•
Granted: —
•
Expires: 2015-04-10
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Abstract

Abstract This invention provides for an acetabular cup and the manufacturing of an acetabular cup implant formed from a composite of polymer materials such that the articulating surface of the implant is 100% ultra high molecular weight poly ethylene (UHMWPE) and the bone engaging surface of the cup contains a significant amount of poly methyl methacrylate (PMMA). The cup would consist of at least two zones. Zone 1 forming the articulating surface and zone two extending from the zone 1 to the bone engaging surface. Preferably, the zone 1 would consist of UHMWPE and would extend a predetermined thickness from the articulating surface. Zone 2 would preferably consist of a mixture of UHMWPE and PMMA dry blended before molding. A third zone may abut zone 2 and consist of PMMA. <IMAGE>

Inventors

  • 👤 Thirumalai Devanathan
  • 👤 Richard S. King

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-24 22:20
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/32; A61F2/34; A61L; A61L27/00; A61L27/14; A61L27/16; A61L27/26; B; B29; B29C; B29C43/00; B29C43/02; B29C43/20; B29C43/203; A61F2/30721; A61F2/30724; A61F2/3094; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30065; A61F2002/30316; A61F2002/30329; A61F2002/30451; A61F2002/30929; A61F2002/30934; A61F2/30942; A61F2002/30957; A61F2002/30971; A61F2002/3445; A61F2002/3448; A61F2210/00; A61F2210/0071; A61F2220/00; A61F2220/0025; A61F2220/0058; A61F2240/00; A61F2240/001; A61F2310/00; A61F2310/00389; A61F2310/00952; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/0633; B29K2033/00; B29K2033/04; B29K2033/12; B29K2105/00; B29K2105/0088

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 47 words
A non-metallic orthopaedic implant comprising: a first layer adapted for sliding contact with second component, a second outer layer, the first layer being formed from a polymer material from a family of polyethylene, the second layer being formed from a blend of polyethylene and poly methyl methacrylate.
Claim 2
Dependent Claim 18 words
The non-metallic implant of Claim 1 wherein the first layer is formed from ultra high molecular weight polyethylene.
Claim 3
Dependent Claim 25 words
The non-metallic implant of Claim 1 further including a third layer molded to the second outer layer, the third layer consisting of poly methyl methacrylate.
Claim 4
Dependent Claim 19 words
The implant of Claims 1 including a spacing member formed from poly methyl methacrylate ultrasonically welded to the implant.
Claim 5
Dependent Claim 27 words
A polymer composite implant consisting of a first layer of substantially ultra high molecular weight polyethylene and a second layer of blended poly methyl methacrylate and polyethylene.
Claim 6
Independent Claim 100 words
A method of making a polymer composite implant, the method comprising the steps of: a) placing a first layer of poly methyl methacrylate in a compression mold; b) placing a second layer of blended poly methyl methacrylate and polyethylene on the layer of poly methyl methacrylate; c) placing a third layer of polyethylene on the layer of blended poly methyl methacrylate; and d) compression molding the first, second, and third layers together using temperature and heat sufficient to cause the poly methyl methacrylate in said second layer to melt and the ultra high molecular weight poly ethylene (UHMWPE) to fuse.
Claim 7
Dependent Claim 23 words
The method of Claim 6 wherein steps a and b include the step of pre-consolidating the first and second layer within the mold.
Claim 8
Independent Claim 75 words
A method of making a polymer composite implant, the method comprising the steps of: a) placing a first layer of blended poly methyl methacrylate and polyethylene in a compression mold; b) placing a second layer of polyethylene on the layer of blended poly methyl methacrylate; and d) compression molding the first and second layers together using temperature and heat sufficient to cause the poly methyl methacrylate in said second layer to flow about the polyethylene.

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