US4964867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Patellar prosthesis
Assignee: DePuy Orthopaedics Inc
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Filing: 1989-02-03
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Granted: 1990-10-23
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Expires: 2009-02-03
Abstract
Abstract Improved resistance to linear displacement through bone is observed in a prosthetic patellar joint when the joint is attached to the patella by a protuberance which has a concave shape.
Inventors
- 👤 John W. Boger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:31
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3877; A61F2/46; A61F2/468; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30113; A61F2002/30138; A61F2002/30153; A61F2002/30154; A61F2002/30156; A61F2002/30199; A61F2002/30224; A61F2002/30233; A61F2002/30235; A61F2002/30237; A61F2002/30299; A61F2002/30316; A61F2002/30535; A61F2002/30594; A61F2/30767; A61F2/30771; A61F2002/30878; A61F2002/30879; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0006; A61F2230/0017; A61F2230/0019; A61F2230/0021; A61F2230/0023; A61F2230/0063; A61F2230/0069; A61F2230/0093; A61F2310/00; A61F2310/00005; A61F2310/00011
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
60 words
A patellar prosthesis sized and shaped to be surgically implanted on the resected bone structure of a patella comprising a bone facing surface and a contoured surface opposite said bone facing surface; a protuberance extending from the bone facing surface for attaching the implant to said resected bone surface, the improvement characterized in that the protuberance comprises a concave shape.
Claim 2
Dependent Claim
60 words
A patellar prosthesis sized and shaped to be surgically implanted on the resected bone structure of a patella comprising a bone facing surface and a contoured surface opposite said bone facing surface; a protuberance extending from the bone facing surface for attaching the implant to said resected bone surface, the improvement characterized in that the protuberance comprises a concave shape.
Claim 3
Dependent Claim
18 words
The improvement of claim 1 wherein the protuberance has a cylindrical shape with an inner and outer diameter.
Claim 4
Dependent Claim
19 words
The improvement of claim 2 wherein at least one opening is present in the circumference of the cylindrical shape.
References Cited (Backward Citations)
US4158894A
Cited
US4281419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |