Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Reexamination Certificate
1999-10-26
2001-04-17
Willse, David H. (Department: 3738)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
C623S020290
Reexamination Certificate
active
06217618
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an orthopaedic implant, and, more particularly, to a tibial knee component.
2. Description of the Related Art
A tibial knee component is implanted within a proximal tibia and engages with a femoral component implanted within a distal femur. The tibial knee component typically includes a bearing which is immovably affixed to a tibial tray. The tibial tray includes a stem which is implanted within the intramedullary (IM) canal in the proximal tibia. The bearing may be in the form of a wear resistant and low friction material such as ultra high molecular weight polyethylene (UHMWPE) which is immovably attached to the tibial tray. Pivotal movement between the femoral component and the bearing surface of the bearing occurs with relatively low friction and low wear characteristics.
It is also known to provide a mobile bearing which moves relative to the tibial tray. During deep flexion between the femur and tibia, the bearing rotates about a longitudinal axis associated with a pivot point at the attachment location between the bearing and tibial tray. While some designs allow for 360 degrees of rotation between the mobile bearing and the tibial tray, most designs have a rotational limit provided. Although known designs are adequate to allow limited rotation between the bearing and tibial tray, they may be relatively complex and thus expensive to manufacture.
What is needed in the art is a tibial knee component with a mobile bearing which is easier to manufacture and still allows adequate movement between the bearing and tibial tray during deep flexion of the knee joint.
SUMMARY OF THE INVENTION
The present invention provides a tibial knee component with a tibial tray, intermediate carrier and bearing which interconnect together and allow pivotal movement between the bearing and tibial tray.
The invention comprises, in one form thereof, an orthopaedic knee component for implanting within a proximal tibia. A tibial tray includes a distally extending stem, a proximal tibial plateau and a post extending from the tibial plateau. The post defines an axis of rotation. An intermediate carrier has an opening in which the post is disposed. The carrier is pivotal about the axis of rotation. A bearing carried by the tibial tray has an articular bearing surface for engagement with a femoral component. The bearing has a recess in which the intermediate carrier is disposed. The projection, carrier and recess allow pivotal movement of the bearing relative to the tibial plateau about the axis of rotation.
An advantage of the present invention is that the bearing is free to pivot relative to the tibial tray about an axis of rotation.
Another advantage is that the bearing is inhibited from moving in an axial direction relative to the axis of rotation.
Yet another advantage is that the keeper block inhibits radial movement of the carrier relative to the post.
A further advantage is that the carrier includes a deflectable ramp which inhibits radial movement of the bearing relative to the post.
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Bristol--Myers Squibb Company
Dawson Todd A.
Pellegrino Brian E
Willse David H.
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