US3774244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knee-joint prosthesis
Assignee: RELIEF RUPTURED AND CRIPPLED S
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Filing: 1972-02-08
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Granted: 1973-11-27
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Expires: 1992-02-08
Abstract
Abstract A knee-joint prosthesis comprises a femoral condyle component and a tibial condyle component secured, respectively, to the femoral and tibial condyles by a cement in resected areas of the bones. The femoral component is an elongated, doubly-curved member that extends from the anterior to the posterior of the femoral condyle and has an external surface shaped to match closely the anatomical shape of the femoral condyle. The tibial component is an elongated member extending from adjacent the anterior extremity to adjacent the posterior extremity of the tibial condylar plateau and positioned for engagement by and support of the fmoral component. The external surface of the tibial component closely matches in transverse cross-sections along its length the transverse shape of the external surface of the femoral component and is generated by a generally straight, anterior-posterior line moved along said transverse curvature. The prosthesis may be duo-condylar, or it may be made unicondylar by provision of the components on only one pair of condyles.
Inventors
- 👤 P Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:05
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2002/3895
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
194 words
A knee-joint prosthesis comprising a femoraL condyle component adapted to be secured to one of the femoral condyles, and a tibial condyle component adapted to be secured to the tibial condyle corresponding to said femoral condyle, the femoral condyle component being an elongated, doubly curved member shaped and dimensioned to extend from the anterior to the posterior of the femoral condyle and having a varying curvature in the anterior-posterior direction closely matching the anatomical shape of the femoral condyle and having in transverse crosssections along its length a laterally outwardly located essentially flat zone and a laterally inwardly located curved zone that is externally convex, the tibial condyle component being an elongated member shaped and dimensioned to extend from adjacent the anterior extremity to adjacent the posterior extremity of the femoral-engaging surface of the tibial condylar plateau and adapted to be positioned for engagement by and support of the femoral component, and the tibial component having an external surface closely matching in transverse cross-sections along its length the transverse shape of the external surface of the femoral component and being a surface generated by a substantially straight anterior-posterior line moved along said transverse shape.
Claim 2
Dependent Claim
194 words
A knee-joint prosthesis comprising a femoraL condyle component adapted to be secured to one of the femoral condyles, and a tibial condyle component adapted to be secured to the tibial condyle corresponding to said femoral condyle, the femoral condyle component being an elongated, doubly curved member shaped and dimensioned to extend from the anterior to the posterior of the femoral condyle and having a varying curvature in the anterior-posterior direction closely matching the anatomical shape of the femoral condyle and having in transverse crosssections along its length a laterally outwardly located essentially flat zone and a laterally inwardly located curved zone that is externally convex, the tibial condyle component being an elongated member shaped and dimensioned to extend from adjacent the anterior extremity to adjacent the posterior extremity of the femoral-engaging surface of the tibial condylar plateau and adapted to be positioned for engagement by and support of the femoral component, and the tibial component having an external surface closely matching in transverse cross-sections along its length the transverse shape of the external surface of the femoral component and being a surface generated by a substantially straight anterior-posterior line moved along said transverse shape.
Claim 3
Dependent Claim
28 words
A knee-joint prosthesis according to claim 1 and further comprising a cement bonding medium adapted to secure the femoral and tibial components to the femoral and tibial condyles.
Claim 4
Dependent Claim
43 words
A knee-joint prosthesis according to claim 1 wherein he femoral condyle component further includes a multiplicity of projections extending from its internal surface and adapted to be received in a resected area of the condyles to anchor the femoral component in place thereon.
Claim 5
Dependent Claim
60 words
A knee-joint prosthesis according to claim 3 wherein the projections include an elongated relatively massive main post projecting from the internal surface of the femoral component and positioned on the component to have its major axis in the direction of elongation aligned generally with the line of load transfer that obtains at the knee joint when the leg is straight.
Claim 6
Dependent Claim
28 words
A knee-joint prosthesis according to claim 4 wherein the surface of the massive post has a multiplicity of concavities disposed in zones generally transverse to its longitudinal axis.
Claim 7
Dependent Claim
17 words
A knee-joint prosthesis according to claim 3 wherein the projections include a multiplicity of spaced-apart small pins.
Claim 8
Dependent Claim
53 words
A knee-joint prosthesis according to claim 1 wherein there are two femoral condyle components positioned in spaced relation to be secured to the lower extremity of each femoral condyle and two tibial condyle components adapted to be secured to each tibial condyle opposite the respective femoral components for engagement thereby and support thereof.
Claim 9
Dependent Claim
22 words
A knee-joint prosthesis according to claim 7 wherein the two femoral condyle components are inter-connected by a crossbar to form a unit.
Claim 10
Dependent Claim
49 words
A knee-joint prosthesis according to claim 8 wherein the crossbar is integral with the said condyle components and has a curvature in the lateral direction, relative to the condyle components generally matching the anatomical shape of and adapted to be received in the anterior intercondylar notch of the femur.
Claim 11
Dependent Claim
40 words
A knee-joint prosthesis according to claim 1 wherein the tibial component has undercut grooves formed in its internal surface and adapted to receive a cement to enhance by mechanical locking the connection of the tibial component to the tibial condyle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |