Patent US5133759A successfully refreshed from Google Patents.
US5133759A
Expired / Lapsed
US
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Asymmetrical femoral condye total knee arthroplasty prosthesis
Assignee: Individual
•
Filing: 1991-05-24
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Granted: 1992-07-28
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Expires: 2011-05-24
Abstract
Abstract A total knee arthroplasty prosthesis wherein the lateral femoral condyle is recessed more into the femur and is sloped cephalod and posterior when implanted on the femur when compared with the medial femoral condyle.
Inventors
- 👤 Richard H. Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:32
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3877
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
55 words
An asymmetrical femoral condyle knee arthroplasty prosthesis comprising a lateral femoral condyle and a connected medial femoral condyle, said lateral femoral condyle being displaced vertically above said medial femoral condyle whereby said lateral femoral condyle is adapted to be recessed further into the femur than is said medial femoral condyle when implanted in the femur.
Claim 2
Dependent Claim
55 words
An asymmetrical femoral condyle knee arthroplasty prosthesis comprising a lateral femoral condyle and a connected medial femoral condyle, said lateral femoral condyle being displaced vertically above said medial femoral condyle whereby said lateral femoral condyle is adapted to be recessed further into the femur than is said medial femoral condyle when implanted in the femur.
Claim 3
Dependent Claim
28 words
The prosthesis of claim 1 wherein said lateral femoral condyle is also sloped cephalad and posterior when implanted on the femur as compared with said medial femoral condyle.
Claim 4
Dependent Claim
27 words
The prosthesis of claim 2 wherein said sloped cephalad and posterior portion of said lateral femoral condyle is in the mid portion of said lateral femoral condyle.
Claim 5
Dependent Claim
60 words
The prosthesis of claim 1 wherein the difference between the amount that said lateral femoral condyle is adapted to be recessed further into the femur when compared with the amount that said medial femoral condyle is adapted to be recessed into the femur is sufficient to permit the patella to minimize patellar femoral force when flexing or extending the knee.
Claim 6
Dependent Claim
37 words
The prosthesis of claim 2 wherein the amount that said lateral femoral condyle is sloped cephalad and posterior when implanted on the femur as compared with said medial patellar femoral force when flexing or extending the knee.
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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) | 1995-07-28 | 1996-01-27 | 1996-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-28 | 2000-01-27 | 2000-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-28 | 2004-01-27 | 2004-07-28 | $7700.00 | Window Closed / Lapsed |