Source: http://www.google.com/patents/US6554866?dq=6,757,710
Timestamp: 2016-08-27 22:31:54
Document Index: 336976603

Matched Legal Cases: ['art 1', 'art 2', 'art 1', 'art 2', 'art 3', 'art 3', 'art 2', 'art 1']

Patent US6554866 - Mono-condylar knee joint prosthesis - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA mono-condylar knee joint prosthesis that includes a femur part having a convex running surface. The knee joint prosthesis further includes a tibia part having a sliding surface which faces the femur part and an intermediate part which is introduced between the femur part and the tibia part during implantation....http://www.google.com/patents/US6554866?utm_source=gb-gplus-sharePatent US6554866 - Mono-condylar knee joint prosthesisAdvanced Patent SearchPublication numberUS6554866 B1Publication typeGrantApplication numberUS 09/672,583Publication dateApr 29, 2003Filing dateSep 28, 2000Priority dateOct 29, 1999Fee statusPaidAlso published asDE50006470D1Publication number09672583, 672583, US 6554866 B1, US 6554866B1, US-B1-6554866, US6554866 B1, US6554866B1InventorsMartin Aicher, Vincent Leclercq, Bernhard G GysslerOriginal AssigneeSulzer Orthopedics Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (7), Referenced by (50), Classifications (17), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetMono-condylar knee joint prosthesis
US 6554866 B1Abstract
A mono-condylar knee joint prosthesis that includes a femur part having a convex running surface. The knee joint prosthesis further includes a tibia part having a sliding surface which faces the femur part and an intermediate part which is introduced between the femur part and the tibia part during implantation. The intermediate part has two bearing surfaces, namely a first, concave bearing surface for cooperating with the convex running surface of the femur part as well as a second bearing surface for cooperating with the sliding surface of the tibia part. A boundary surface is provided at the tibia part which bounds the sliding surface of the tibia part and projects pointing in the direction towards the femur part in order to be able to cooperate with a side surface of the intermediate part. The boundary surface which is provided at the tibia part is formed to be curved in the shape of an arch, and the intermediate part has a side surface which is curved corresponding to the boundary surface which is provided at the tibia part and which is curved in the shape of an arch.
In accordance with more recent recognitions on the kinematics of the human knee joint it is however the case that the femoro-tibial contact point describes a path which cannot be particularly well approximated by a rectilinear path—such as is described above. This means that if the actual path of the femoro-tibial contact point is approximated by a rectilinear path, as is done in the above-described guiding along the boundary surface which extends rectilinearly in the anterior/posterior direction, then the ligament apparatus is stressed more strongly than is the case in the natural, intact knee.
Here the invention wishes to provide a remedy. It is therefore an object of the invention to propose a mono-condylar knee joint prosthesis which does not have the above-described disadvantages. The prosthesis should on the one hand bring about a guided movement which corresponds as well as possible to the natural movement of the knee, and the muscles and ligaments should be stressed as naturally as possible. On the other hand the prosthesis should also be able to take up forces in the medial/lateral direction so that such forces can be taken up by the prosthesis and then ultimately by the bone, that is, by the tibia, and need not additionally be taken up by the muscles and ligaments or by the intact half of the bone bearing respectively.
FIG. 1 is a plan view of an exemplary embodiment of a tibia part of a mono-condylar knee joint prosthesis in accordance with the invention,
An exemplary embodiment of a tibia part of a mono-condylar knee joint prosthesis in accordance with the invention is illustrated in FIGS. 1-3. The tibia part 1 comprises a sliding surface 10 on which an intermediate part 2 is slidingly displaceable (see FIG. 4 and FIG. 5 respectively). A boundary wall with a boundary surface 11 which bounds the sliding surface 10 is provided at the tibia part 1. The boundary surface 11 is curved so as to be arcuate, in particular in the shape of a circular segment, and is formed in the exemplary embodiment described to be convex. The radius of curvature of this boundary surface 11 is designated by R1.
In FIG. 4 and FIG. 5 an exemplary embodiment of an intermediate part (often also designated as a “meniscus part”) is illustrated, in FIG. 4 in a perspective view and in FIG. 5 in a plan view. The intermediate part 2 has a first, concave bearing surface 20 which faces the femur part 3 (see FIG. 6, FIG. 7). The concave bearing surface is preferably designed spherically and has the same radius of curvature as the running surface 30 of the femur part 3, so that maximum congruence and thus as low a surface pressing as possible result. Furthermore, the intermediate part 2 comprises a second bearing surface 22 which cooperates with the sliding surface 11 of the tibia part 1.
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28, 2005Jan 23, 2013Arthrosurface IncSystem for articular surface replacementEP2324799A2Nov 22, 2005May 25, 2011Conformis, Inc.Patient selectable knee joint arthroplasty devicesEP2335654A1Nov 24, 2004Jun 22, 2011Conformis, Inc.Patient selectable knee joint arthoplasty devicesEP2520255A1Nov 21, 2006Nov 7, 2012Vertegen, Inc.Devices and methods for treating facet joints, uncovertebral joints, costovertebral joints and other jointsWO2006004885A2Jun 28, 2005Jan 12, 2006Arthrosurface, Inc.System for articular surface replacementWO2007062079A2Nov 21, 2006May 31, 2007Philipp LangDevices and methods for treating facet joints, uncovertebral joints, costovertebral joints and other joints* Cited by examinerClassifications U.S. Classification623/20.29, 623/20.3, 623/20.28International ClassificationA61F2/38, A61F2/30, A61F2/46, A61F2/00Cooperative ClassificationA61F2310/00407, A61F2002/30884, A61F2/3868, A61F2002/4631, A61F2002/30878, A61F2002/30892, A61F2/30767, A61F2310/00029, A61F2002/3895European ClassificationA61F2/38KLegal EventsDateCodeEventDescriptionSep 28, 2000ASAssignmentOwner name: SULZER ORTHOPEDICS LTD., SWITZERLANDFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:AICHER, MARTIN;LECLERCQ, VINCENT;GYSSLER, BERNHARD;REEL/FRAME:011226/0757;SIGNING DATES FROM 20000726 TO 20000727Oct 19, 2006FPAYFee paymentYear of fee payment: 4Nov 14, 2006ASAssignmentOwner name: ZIMMER GMBH, SWITZERLANDFree format text: TRANSFORMATION WITHOUT LIQUIDATION;ASSIGNOR:SULZER ORTHOPEDICS LTD;REEL/FRAME:018515/0289Effective date: 20040630Oct 28, 2010FPAYFee paymentYear of fee payment: 8Oct 2, 2014FPAYFee paymentYear of fee payment: 12RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services