Patent US5246460A successfully refreshed from Google Patents.
US5246460A
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Prosthetic patellar components
Assignee: BTG International Ltd
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Filing: 1991-08-28
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Granted: 1993-09-21
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Expires: 2011-08-28
Abstract
Abstract A prosthetic patellar component is provided which has a fixation part adapted to be secured to the bone of the patella and an articulation part defining a surface for replacing the femoral facet of the natural patella, with these parts being mutually engageable in such a manner as to allow rotation between them about a medio-lateral axis relative to the surface which replaces the femoral facet.
Inventors
- 👤 John W. Goodfellow
- 👤 John J. O'Connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:34
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3877; A61F2002/3881
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
65 words
In a human knee joint, an implantable prosthetic patellar component comprising a first part sized to be fixed to the bone of the patella, and a second part defining an articulation surface which replaces the natural femoral facet of the patella, said first and second parts being mutually engaged in such a manner as to allow rotation therebetween about a medio-lateral axis of the joint.
Claim 2
Dependent Claim
65 words
In a human knee joint, an implantable prosthetic patellar component comprising a first part sized to be fixed to the bone of the patella, and a second part defining an articulation surface which replaces the natural femoral facet of the patella, said first and second parts being mutually engaged in such a manner as to allow rotation therebetween about a medio-lateral axis of the joint.
Claim 3
Dependent Claim
49 words
A component according to claim 1 wherein said first part has a first curved interface surface opposite to said bone, said second part has a second curved interface surface opposite to said articulation surface and said first and second interface surfaces are mutually slidably engaged to allow said rotation.
Claim 4
Dependent Claim
19 words
A component according to claim 1 wherein said first and second interface surfaces are respectively convexly and concavely curved.
Claim 5
Dependent Claim
17 words
A component according to claim 3 wherein said first and second interface surfaces are each spherically shaped.
Claim 6
Dependent Claim
22 words
A component according to any one of claims 1, 2, 3 or 4 wherein said articulation surface has a concave sagittal profile.
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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) | 1996-09-20 | 1997-03-22 | 1997-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-20 | 2001-03-22 | 2001-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-20 | 2005-03-22 | 2005-09-21 | $7700.00 | Window Closed / Lapsed |