Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Reexamination Certificate
1999-10-26
2001-04-03
Mancene, Gene (Department: 3732)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
C623S020240, C623S020140
Reexamination Certificate
active
06210444
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 having a post and keyhole shaped recess, and a bearing having a projection positioned within the recess and an opening receiving the post.
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 and a distally extending stem. The tibial tray also includes a recess extending into the tibial plateau. The recess is configured to define a first rotational stop and a second rotational stop. The tibial tray further includes a generally cylindrical post positioned within the recess. The post extends generally orthogonal to the tibial plateau and defines an axis of rotation. A bearing is carried by the tibial tray and has an articular bearing surface for engagement with a femoral component. The bearing has an opening in which the post is disposed. The opening and the post allow pivotal movement of the bearing relative to the tibial plateau about the axis of rotation. The bearing further has a projection extending into the recess of the tibial tray. The projection is configured to abut the first rotational stop when the bearing is at a first rotational limit and is configured to abut the second rotational stop when the bearing is at a second rotational limit.
An advantage of the present invention is that the keyhole shaped recess and projection allow rotation of the bearing between first and second rotational limits.
Another advantage is that the post and opening allow rotational movement of the bearing while not allowing radial movement of the bearing relative to the axis of rotation.
Yet another advantage is that substantially all of the bearing backing is supported by the tibial plateau at any pivotal position.
REFERENCES:
patent: 4085466 (1978-04-01), Goodfellow et al.
patent: 4094017 (1978-06-01), Matthews et al.
patent: 4136405 (1979-01-01), Pastrick et al.
patent: 4216549 (1980-08-01), Hillberry et al.
patent: 4219893 (1980-09-01), Noiles
patent: 4224696 (1980-09-01), Murray et al.
patent: 4224697 (1980-09-01), Murray et al.
patent: 4257129 (1981-03-01), Volz
patent: 4262368 (1981-04-01), Lacey
patent: 4301553 (1981-11-01), Noiles
patent: 4309778 (1982-01-01), Buechel et al.
patent: 4470158 (1984-09-01), Pappas et al.
patent: 4586933 (1986-05-01), Shoji et al.
patent: 4634444 (1987-01-01), Noiles
patent: 4728332 (1988-03-01), Albrektsson
patent: 4888021 (1989-12-01), Forte et al.
patent: 4950297 (1990-08-01), Elloy et al.
patent: 5011496 (1991-04-01), Forte et al.
patent: 5080675 (1992-01-01), Lawes et al.
patent: 5171283 (1992-12-01), Pappas et al.
patent: 5271737 (1993-12-01), Baldwin et al.
patent: 5271747 (1993-12-01), Wagner et al.
patent: 5282868 (1994-02-01), Bahler
patent: 5314481 (1994-05-01), Bianco
patent: 5314483 (1994-05-01), Wehrli et al.
patent: 5330533 (1994-07-01), Walker
patent: 5344460 (1994-09-01), Turanyi et al.
patent: 5358527 (1994-10-01), Forte
patent: 5358530 (1994-10-01), Hodorek
patent: 5358531 (1994-10-01), Goodfellow et al.
patent: 5370701 (1994-12-01), Finn
patent: 5387240 (1995-02-01), Pottenger et al.
patent: 5395401 (1995-03-01), Bahler
patent: 5413604 (1995-05-01), Hodge
patent: 5413608 (1995-05-01), Keller
patent: 5458644 (1995-10-01), Grundei
patent: 5480446 (1996-01-01), Goodfellow et al.
patent: 5549689 (1996-08-01), Epstein et al.
patent: 5556432 (1996-09-01), Kubein-Meesenburg et al.
patent: 5609639 (1997-03-01), Walker
patent: 5609644 (1997-03-01), Ashby et al.
patent: 5658342 (1997-08-01), Draganich et al.
patent: 5683468 (1997-11-01), Pappas
patent: 5702466 (1997-12-01), Pappas et al.
patent: 5725584 (1998-03-01), Walker et al.
patent: 5755804 (1998-05-01), Schmotzer et al.
patent: 5879394 (1999-03-01), Ashby et al.
patent: 5951603 (1999-09-01), O'Neil et al.
patent: 5954770 (1999-09-01), Schmotzer et al.
patent: 6090144 (2000-07-01), Letot et al.
patent: 0 472 475 A2 (1991-07-01), None
patent: 0 498 586 A1 (1992-01-01), None
patent: 0 519 872 A1 (1992-06-01), None
patent: 0 592 750 B1 (1992-12-01), None
patent: 0 670 151 A2 (1995-01-01), None
patent: 0 636 353 A1 (1995-02-01), None
patent: 0 674 887 A1 (1995-03-01), None
patent: 79 20563 (1979-08-01), None
patent: 2 277 034 (1994-10-01), None
patent: 2 278 782 (1994-12-01), None
patent: 2 280 375 (1995-02-01), None
patent: 2 291 355 (1995-07-01), None
patent: 2 291 355 (1996-01-01), None
patent: 2 293 109 (1996-03-01), None
patent: 2 304 051 (1997-03-01), None
patent: 2 312 168 (1997-10-01), None
patent: 2 312 167 (1997-10-01), None
patent: 2 312 166 (1997-10-01), None
patent: 2 312 377 (1997-10-01), None
patent: 2 313 314 (1997-11-01), None
patent: WO 95/22303 (1995-08-01), None
patent: WO 95/25484 (1995-09-01), None
patent: WO 95/27450 (1995-10-01), None
patent: WO 95/30390 (1995-11-01), None
patent: WO 96/01087 (1996-01-01), None
patent: WO 96/03097 (1996-02-01), None
The Mechanical Testing of a Sliding Meniscus Knee Prosthesis; R. J. Minns, B.Eng., M.Sc., Ph.D., J. Campbell, CH.B., M.Ch. (Ortho), FRCS, Clinical Orthopaedics; Nov.-Dec. 1978, vol. 137, pp. 268-275.
S-ROM® Modular Total Knee System; Joint Medical Products Corp; 1993.
TRA™ Knee System Design Rationale; Nov. 1996, pp. 1-23.
New Jersey LCS® Total Knee System; DePuy; 1994.
SAL Self-Aligning Total Knee Replacement; Protek.
Difficulties With Bearing Dislocation and Breakage Using a Movable Bearing Total Knee Replacement System; James K. Weaver, M.D., Robert S. Kerkash, M.D., A. Seth Greenwald D. Phil. (Oxon); Clincal Orthopaedics and Related Research. No. 290: pp 244-252: 1993 J. B. Lippincott Company.
The Sliding Meniscus Knee Prosthesis: Design Concepts; R. J. Minns, J. Campbell.
The Design and BioMechanics of a Sliding Menisucs Knee Prosthesis; R. J. Minns; pp 306-309.
The Oxford Meniscal Knee Phase II; Biomet Ltd.; British JBJS, May 1988.
New Jersey Tricompartmental Total Knee System with Porocoat Surgical Procedure; Frederick F. Buechel, M.D.; DePuy.
New Jersey LCS™Total Knee System with Porocoat; DePuy; JBJS vol. 67-A, No. 8; Oct. 1985.
AGC Total Knee System; Biomet Ltd., British JBJS; No. 1985.
Minns Meniscal Knee—A Total Prosthesis for Early Joint Degeneration; Zimmer (Swindon).
Gliding Meniscal Knee—A Major Development in Cruciate-Retaining Arthroplasty; Zimmer (Swindon).
Longer Implant Life in Three Easy Lessons; JBJS—Jul. 1998; DePuy.
SAL Self-Aligning, An
Miller Clayton R.
Webster Vincent A.
Bristol--Myers Squibb Company
Dawson Todd A.
Mancene Gene
Priddy Michael B.
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