Patent US2984653A successfully refreshed from Google Patents.
Patent US4888020A successfully refreshed from Google Patents.
US4888020A
Expired / Lapsed
US
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Femur for a knee joint prosthesis
Assignee: Sulzer AG
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Filing: 1984-03-09
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Granted: 1989-12-19
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Expires: 2004-03-09
Abstract
Abstract The femur part is made for clamping to the end of a femur bone in the manner of a "clamp strap". The femur part includes a backwall having a convex outer surface facing a patella shield which is likewise provided with a facing convex surface. The vertex lines of the respective surfaces define a wedge angle which permits the femur part to be clamped to the femur bone. In addition, the vertex lines of the two surfaces are located in a common connecting plane which is perpendicular to the respective tangential planes passing through the vertex lines. The wedge angle may extend up to 30°.
Inventors
- 👤 Willi Horber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:05
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3859
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
A femur part for a knee joint prosthesis comprising a pair of condyle shells; a patella shield connecting said shells together frontally and having a rearwardly facing convex surface; a backwall connecting said shells, together dorsal and having a convex outer surface facing said patella shield and a femoral plateau connecting said patella shield to said backwall; wherein each said surface has a vertex line disposed in a common connecting plane, said lines being mutually juxtaposed near each other to define an acute wedge angle therebetween converging distally of from greater than 0° to 30°, said plane being perpendicular to a respective tangential plane passing through each said vertex line.
Claim 2
Dependent Claim
110 words
A femur part for a knee joint prosthesis comprising a pair of condyle shells; a patella shield connecting said shells together frontally and having a rearwardly facing convex surface; a backwall connecting said shells, together dorsal and having a convex outer surface facing said patella shield and a femoral plateau connecting said patella shield to said backwall; wherein each said surface has a vertex line disposed in a common connecting plane, said lines being mutually juxtaposed near each other to define an acute wedge angle therebetween converging distally of from greater than 0° to 30°, said plane being perpendicular to a respective tangential plane passing through each said vertex line.
Claim 3
Dependent Claim
42 words
A femur part as set forth in claim 1 wherein a bisector of said wedge angle forms an angle of at most one-half said wedge angle with a surface normal to a tangential plane passing through a vertex of said condyle shells.
Claim 4
Dependent Claim
28 words
A femur part as set forth in claim 1 wherein said common connecting plane is inclined to a sagittal plane in one of a medial or lateral direction.
Claim 5
Dependent Claim
24 words
A femur part as set forth in claim 1 wherein said patella shield is asymmetric relative to a sagittal plane between said condyle shells.
Claim 6
Dependent Claim
81 words
A femur part for a knee joint prosthesis comprising a pair of condyle shells; a patella shield connecting said shells together ventrally and having a rearwardly facing convex surface; a backwall connecting said shells together dorsally and having a convex outer surface facing said patella shield to engage a femur bone therebetween; and each said surface having a vertex line disposed in a common connecting plane, said plane being perpendicular to a respective tangential plane passing through each said vertex line.
Claim 7
Dependent Claim
81 words
A femur part for a knee joint prosthesis comprising a pair of condyle shells; a patella shield connecting said shells together ventrally and having a rearwardly facing convex surface; a backwall connecting said shells together dorsally and having a convex outer surface facing said patella shield to engage a femur bone therebetween; and each said surface having a vertex line disposed in a common connecting plane, said plane being perpendicular to a respective tangential plane passing through each said vertex line.
Claim 8
Dependent Claim
19 words
A femur part as set forth in claim 5 wherein said vertex lines define an acute wedge angle therebetween.
Claim 9
Dependent Claim
16 words
A femur part as set forth in claim 6 wherein said wedge angle (a) is 0<α<30°.
Claim 10
Dependent Claim
19 words
A femur part as set forth in claim 5 wherein said vertex lines are mutually juxtaposed nearest each other.
Claim 11
Dependent Claim
28 words
A femur part as set forth in claim 5 wherein said common connecting plane is inclined to a sagittal plane in one of a medial or lateral direction.
References Cited (Backward Citations)
US3798679A
Cited
US4353135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-18 | 1993-06-19 | 1993-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-18 | 1997-06-19 | 1997-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-18 | 2001-06-19 | 2001-12-19 | $7700.00 | Window Closed / Lapsed |