Patent US5226916A successfully refreshed from Google Patents.
US5226916A
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US
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Prosthetic femoral components
Assignee: BTG International Ltd
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Filing: 1991-08-28
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Granted: 1993-07-13
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Expires: 2011-08-28
Abstract
Abstract A prosthetic femoral component of tricompartmental form has tibial facet surfaces (21) of like spherical shape and a patellar facet groove (31) of circular arcuate longitudinal shape, the latter having a slightly larger radius of curvature than the former, by about 1.2:R, and with the center of curvature (34) of the latter being respectively off-set by about 0.4 R and 0.6 R superiorly and anteriorly relative to those (26) of the former as seen in a lateral aspect.
Inventors
- 👤 John W. Goodfellow
- 👤 John J. O'Connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:01
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3859
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
A prosthetic femoral component of tricompartmental form comprising an integrated body defining two articulation surfaces of spherical shape in spaced side-by-side disposition to assume the roles of respective tibial facets, and a further articulation surface in the form of a groove extending longitudinally in off-set manner sagittally between said two articulation surfaces to assume the role of patellar facet, said groove having circular arcuate longitudinal shape.
Claim 2
Dependent Claim
66 words
A prosthetic femoral component of tricompartmental form comprising an integrated body defining two articulation surfaces of spherical shape in spaced side-by-side disposition to assume the roles of respective tibial facets, and a further articulation surface in the form of a groove extending longitudinally in off-set manner sagittally between said two articulation surfaces to assume the role of patellar facet, said groove having circular arcuate longitudinal shape.
Claim 3
Dependent Claim
30 words
A component according to claim 1 wherein said two articulation surfaces are of the same radius of curvature and said circular arcuate shape is of the same order of radius.
Claim 4
Dependent Claim
28 words
A component according to claim 2 wherein said circular arcuate shape radius is larger than that of said two articulation surfaces by a small proportion of the latter.
Claim 5
Dependent Claim
16 words
A component according to claim 3 wherein said radii are in a ratio of about 1.2:1.
Claim 6
Dependent Claim
24 words
A component according to any one of claims 1 to 4 wherein said two articulation surfaces are coincident as seen in a lateral aspect.
Claim 7
Dependent Claim
19 words
A component according to claim 5 wherein said further articulation surface is disposed centrally between said two articulation surfaces.
Claim 8
Dependent Claim
58 words
A component according to claim 5 wherein the centre of curvature of said further articulation surface is respectively off-set by about 0.4 R and 0.6 R superiorly and anteriorly relative to the centres of curvature of said two articulation surfaces as seen in a lateral aspect, where R is the radius of curvature of said two articulation surfaces.
Claim 9
Dependent Claim
27 words
A component according to claim 5 wherein the centres of curvature of said two articulation surfaces are spaced by about 2.3 times the related radius of curvature.
Claim 10
Dependent Claim
18 words
A component according to claim 1 wherein said further articulation surface groove has a circular arcuate cross-sectional shape.
References Cited (Backward Citations)
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FR2172104A1
Cited
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US4085466A
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Cited
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FR2465470A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |