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Patent EP0627203A2 successfully refreshed from Google Patents.
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EP0627203A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Prosthetic joint

Assignee: Joint Medical Products Corp
•
Filing: 1989-01-31
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Granted: —
•
Expires: 2009-01-31
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Abstract

Abstract A prosthetic knee joint (10,12,13) is provided having an extended position (Figure 7), an intermediate position (Figure 8), and a flexed position (Figures 9 and 10). The motion of the joint includes a minor segment from the extended position to the intermediate position, and a major segment from the intermediate position to the flexed position. The center of pressure between the femoral component (10) and the tibial component (12) moves rearward on the tibia during the minor segment. During the major segment, the joint flexes about an axis of rotation (common center of radii R3 and R4) with the bearing surfaces (20c,20d,34c,34d) on the femoral (10) and tibial (12) components being in congruent engagement. The distal surface of the femoral component (10) includes two rails (88) for engagement with a patellar prosthesis (80). <IMAGE>

Inventors

  • 👤 Mark R. Forte
  • 👤 Douglas G. Noiles

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-24 18:45
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3836; A61F2/384; A61F2/385; A61F2/3868; A61F2/3886; A61F2/3877; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00029

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 210 words
A prosthetic joint for providing flexion motion between two bones comprising: (a) a convex bearing component (10) having a first bearing area (20b) and a contiguous second bearing area (20c), the second bearing area (20c) being a surface of revolution about a first axis and having a radius of curvature (R₃) which is less than the radius of curvature (R₂) off the first bearing area (20b); and (b) a concave bearing component (13) having a third bearing area (34b) for engagement with the first bearing area (20b) and a contiguous fourth baring area (34c) for engagement with the second bearing area (20c), the fourth bearing area (34c) being a surface of revolution about a second axis and having a radius of curvature (R₃) which is less than the radius of curvature of the third bearing area (34b); wherein: the radius of curvature (R₃) of the second bearing area (20c) is substantially the same as the radius of curvature (R₃) of the fourth bearing area (34c) so that the second and fourth bearing areas (20c, 34c) may be in congruent engagement with one another; and the flexion axis of the joint is parallel to the first and second axes when the second and fourth bearing areas (20c, 34c) are in engagement.
Claim 2
Dependent Claim 47 words
The prosthetic joint of Claim 1 wherein the area of contact between the convex and concave bearing components (10, 13) is greater when the second and fourth bearing areas (20c, 34c) are in engagement the when the first and third bearing areas (20b, 34b) are in engagement.
Claim 3
Dependent Claim 33 words
The prosthetic joint of Claim 1 or 2 wherein the radius of curvature of the third bearing area (34b) is greater than the radius of curvature (R₂) of the first bearing area (20b).
Claim 4
Dependent Claim 33 words
The prosthetic joint of Claim 1, 2 or 3 wherein the joint is a knee joint, the first component (10) is a femoral component, and the second component (13) is a tibial component.

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