EP0522822B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Knee joint prosthesis articular surface
Assignee: Smith and Nephew Inc
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Filing: 1992-07-06
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Granted: 1995-12-13
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Expires: 2012-07-06
Abstract
Abstract There is disclosed a knee replacement prosthesis (10) includes a tibial component (10-A) and a femoral component (10-B) with improved articular surface geometries. The improved geometries allow substantial internal rotation of the tibial component (10-A) with respect to the femoral component (10-B) during at least the first twenty degrees (20 DEG ) of flexion. The tibial and femoral components (10-A, 10-B) are capable of flexing about an axis that reaches an inclination of from about ten degrees (10 DEG ) to about fifty degrees (50 DEG ) to the horizontal. <IMAGE>
Inventors
- 👤 David L. Evans
- 👤 Mark S. Gosney
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 20:58
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
76 words
A knee replacement prosthesis (10) comprising: a) a tibial component (10-A); b) a femoral component (10-B) that articulates against the tibial component (10-A); characterized in that c) the tibial (10-A) and femoral (10-B) components are capable of flexing about a flexion axis that reaches an inclination of from ten degrees (10°) to fifty degrees (50°) with respect to a line that is tangent to the distal femoral condyles in the frontal plane, while maintaining congruent contact.
Claim 2
Dependent Claim
39 words
A prosthesis as claimed in claim 1 wherein the femoral component (10-B) is capable of external rotation with respect to the tibial component (10-A), at least during the first few degrees of flexion from a beginning fully extending position.
Claim 3
Dependent Claim
33 words
A prosthesis as claimed in claim 1 or 2, wherein the flexion axis is higher toward the middle portion of the users body and lower toward the side portion of the users body.
Claim 4
Dependent Claim
22 words
A prosthesis as claimed in any one of the preceding claims, wherein the tibial component (10-A) includes a single condylar articulating surface.
Claim 5
Dependent Claim
22 words
A prosthesis as claimed in any one of the preceding claims, wherein the femoral component (10-B) includes a single condylar articulating surface.
Claim 6
Dependent Claim
26 words
A prosthesis as claimed in any one of claims 1 to 4, wherein the tibial component (10-A) has a pair of spaced apart condylar articulating surfaces.
Claim 7
Dependent Claim
28 words
A prosthesis as claimed in any one of claims 1 to 4 or 6, wherein the femoral component (10-B) has a pair of spaced apart condylar articulating surfaces.
Claim 8
Dependent Claim
43 words
A prosthesis as claimed in any one of the preceding claims, wherein the condylar articulating surface can be generated by rotating a curved line profile about an inclined axis that is inclined between ten (10) and fifty (50) degrees with respect to horizontal.
Claim 9
Dependent Claim
28 words
A prosthesis as claimed in claim 8, wherein the curved profile is rotated about the inclined axis by a measure between one and one hundred twenty degrees (1°-120°).
Claim 10
Dependent Claim
136 words
A knee joint prosthesis comprising: a) a tibial component (10-A) with a tibial articulating surface (11); b) a femoral component (10-B) with a femoral articulating surface (21); c) a means for attaching the tibial component to the patient's tibia; d) means for attaching the femoral component to the patient's femur; characterized in that e) the tibial and femoral components (10-A, 10-B) being capable of flexing about a flexion axis that reaches an inclination of from ten degrees (10°) to fifty degrees (50°) with respect to a line that is tangent to the distal femoral condyles in the frontal plane; and f) wherein substantial internal rotation of the tibial component (10-A) is enabled with respect to the femoral component (10-B) during flexion, and with substantial congruent area contact maintained between the tibial and femoral articulating surfaces (11,21).
References Cited (Backward Citations)
No citation records indexed.
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