US5021061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthetic patello-femoral joint
Assignee: Queen's University
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Filing: 1990-09-26
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Granted: 1991-06-04
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Expires: 2010-09-26
Abstract
Abstract A thin plate patello-femoral-tibial resurfacing prosthesis is described. The patellar component is a metallic shell which is designed to be as thin as possible so as to retain maximum natural bone thickness and hence strength. The metallic patellar component articulates with a plastic insert in a metallic femoral component. The tibial bearing area of the femoral component is metallic for articulation with a plastic proximal tibial prosthesis.
Inventors
- 👤 Henk W. Wevers
- 👤 John F. Rudan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:40
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3877
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
120 words
A knee joint prosthesis comprising a patellar component and a femoral component; said patellar component comprising a thin metallic shell having a shaped anterior surface adapted to be secured within a resected patella of a patient, and a convex posterior surface adapted to articulate within a resected femur of said patient between opposed condyles thereof; the femoral component including a metal shell having a shaped posterior surface portion between opposed condyles adapted to be secured within said resected femur and a concave anterior surface adapted to receive and retain an element of dissimilar material to said thin shell having a mating convex posterior surface and a concave anterior surface for articulation with said convex posterior surface of said patellar component.
Claim 2
Dependent Claim
120 words
A knee joint prosthesis comprising a patellar component and a femoral component; said patellar component comprising a thin metallic shell having a shaped anterior surface adapted to be secured within a resected patella of a patient, and a convex posterior surface adapted to articulate within a resected femur of said patient between opposed condyles thereof; the femoral component including a metal shell having a shaped posterior surface portion between opposed condyles adapted to be secured within said resected femur and a concave anterior surface adapted to receive and retain an element of dissimilar material to said thin shell having a mating convex posterior surface and a concave anterior surface for articulation with said convex posterior surface of said patellar component.
Claim 3
Dependent Claim
37 words
A knee joint prosthesis as claimed in claim 1 wherein said metallic femoral component includes a convex tibial bearing surface adjacent but separated from said patella-articulating element articulating with said convex posterior surface of said patellar component.
Claim 4
Dependent Claim
179 words
A knee joint prosthesis comprising a patellar component, a femoral component and a tibial component; said patellar component comprising a thin shell having a shaped anterior surface adapted to be secured within a resected patella of a patient, and a convex posterior surface adapted to articulate within a resected femur of said patient between opposed condyles thereof; said femoral component including a metal shell having a shaped posterior surface portion between opposed condyles adapted to be secured within said resected femur and a concave anterior surface adapted to receive and retain an element of dissimilar material to said thin shell having a mating convex posterior surface and a concave anterior surface for articulation with said convex posterior surface of said patellar component; and wherein said femoral component includes a concave posterior surface adapted to be secured on a convexly resected distal end of said femur and a convex anterior surface for articulation with said tibial component; and wherein said tibial component includes a contoured pad of dissimilar material for articulation with said convex anterior surface of said femoral component.
Claim 5
Dependent Claim
179 words
A knee joint prosthesis comprising a patellar component, a femoral component and a tibial component; said patellar component comprising a thin shell having a shaped anterior surface adapted to be secured within a resected patella of a patient, and a convex posterior surface adapted to articulate within a resected femur of said patient between opposed condyles thereof; said femoral component including a metal shell having a shaped posterior surface portion between opposed condyles adapted to be secured within said resected femur and a concave anterior surface adapted to receive and retain an element of dissimilar material to said thin shell having a mating convex posterior surface and a concave anterior surface for articulation with said convex posterior surface of said patellar component; and wherein said femoral component includes a concave posterior surface adapted to be secured on a convexly resected distal end of said femur and a convex anterior surface for articulation with said tibial component; and wherein said tibial component includes a contoured pad of dissimilar material for articulation with said convex anterior surface of said femoral component.
Claim 6
Dependent Claim
25 words
A knee joint prosthesis as claimed in claim 3 wherein said contoured pad in said tibial component is an ultra high molecular weight polyethylene pad.
Claim 7
Dependent Claim
33 words
A knee joint prosthesis as claimed in claim 4 wherein said contoured pad is contained within a metallic shell sized to conform, in cross section, to the proximal end of a resected tibia.
Claim 8
Dependent Claim
35 words
A knee joint prosthesis as claimed in claim 1 wherein said thin shell of said patellar component is a metallic shell sized such that said resected patella retains at least 80% of its natural strength.
Claim 9
Dependent Claim
35 words
A knee joint prosthesis as claimed in claim 3 wherein said thin shell of said patellar component is a metallic shell sized such that said resected patella retains at least 80% of its natural strength.
Claim 10
Dependent Claim
52 words
A knee joint prosthesis comprising a femoral resurfacing metallic component having a first bearing surface arranged for articulation with a tibial prosthesis of dissimilar materials and a second bearing surface arranged for articulation with a patellar prosthesis, said second bearing surface being formed by a dissimilar material set into said femoral component.
Claim 11
Dependent Claim
52 words
A knee joint prosthesis comprising a femoral resurfacing metallic component having a first bearing surface arranged for articulation with a tibial prosthesis of dissimilar materials and a second bearing surface arranged for articulation with a patellar prosthesis, said second bearing surface being formed by a dissimilar material set into said femoral component.
Claim 12
Dependent Claim
28 words
A knee joint prosthesis as claimed in claim 8 wherein said second bearing surface comprises an ultra high molecular weight polyethylene pad mounted in said metallic femoral component.
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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) | 1994-06-03 | 1994-12-03 | 1995-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-03 | 1998-12-03 | 1999-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-03 | 2002-12-03 | 2003-06-04 | $7700.00 | Window Closed / Lapsed |