Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Reexamination Certificate
1999-07-02
2001-11-20
Isabella, David J. (Department: 3738)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
C623S020240, C623S020290, C623S020320
Reexamination Certificate
active
06319283
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 fixed to a tibial tray. The tibial tray may include a stem which is implanted within the intramedullary (IM) canal in the proximal tibia. The bearing may be in the form of a low friction material highly resistant to wear such as ultra high molecular weight polyethylene (UHMWPE) which is fixed to the tibial tray. Articular movement between the femoral component and the bearing surface of the bearing occurs with relatively low friction and wear characteristics.
It is also known to provide a mobile bearing which moves to a limited extent relative to the tibial tray. During deep flexion between the femur and tibia, the bearing rotates to a limited extent about a longitudinal axis associated with a pivot point at the attachment location between the bearing and tibial tray. 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 having a cylindrical projection which is received within a cylindrical opening of a bearing. The bearing may be further attached to the tibial tray using a bolt to inhibit axial movement thereof, and may include a vent hole in fluid communication with the opening for allowing a fluid to escape from the opening. The bearing has a backing surface which is substantially entirely supported by the tibial tray, regardless of the relative positioning 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 proximal tibial plateau with a projection extending generally orthogonal to the tibial plateau. The tibial tray also includes a distally extending stem. A bearing is coupled with the tibial plateau and has an articular bearing surface for engagement with a femoral component. The bearing is rotationally movable between a first rotational limit and a second rotational limit about an axis extending generally orthogonal to the tibial plateau. The bearing has a backing surface engaging the tibial plateau which is sized and shaped such that the backing surface is substantially entirely supported by the tibial plateau at any position during rotational movement between the first rotation limit and the second rotational limit.
The invention comprises, in another form thereof, an orthopaedic knee component for implanting within a proximal tibia. A tibial tray includes a proximal tibial plateau, a projection extending generally orthogonal from the tibial plateau and defining an axis of rotation, and a distally extending stem. A bearing is carried by the tibial tray and has an opening in which the projection is disposed. The opening and the projection allow rotational movement of the bearing relative to the tibial plateau about the axis. The bearing has an articular bearing surface for engagement with a femoral component. The bearing further has a vent hole in fluid communication with the opening.
An advantage of the present invention is that substantially all of the bearing backing surface is supported by the tibial plateau at any rotational position.
Another advantage is that the bearing is provided with a vent hole which allows air to escape from the opening when the projection is inserted therein during assembly, and allows bodily fluid to escape from the opening after implantation.
Yet another advantage is that a fastener such as a bolt may be used to further fasten the bearing to the tibial tray, effectively extending the length of the projection and preventing lift off of the bearing during deep flexion of the knee.
A further advantage is that the tibial tray and bearing are provided with a post and notch configuration, respectively, to limit the rotational movement of the bearing relative to the tibial tray.
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The Sliding Menisc
Insall John
McLean Christopher
Miller Clayton R.
Patmore Audrey
Tanamal Linggawati
Bristol--Myers Squibb Company
Chattopadhyay Urmi
Dawson Todd A.
Isabella David J.
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