Source: http://www.google.com/patents/US4865606?dq=7751826
Timestamp: 2014-11-27 02:55:31
Document Index: 397626364

Matched Legal Cases: ['art 6', 'art 8', 'art 6', 'art 18', 'art 18', 'art 8', 'art 8', 'art 32']

Patent US4865606 - Endoprosthesis for a knee-joint - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn endoprosthesis for a knee joint comprising a femur part (6), a tibia part (8), and a middle part (18) which is articulated on the femur part (6) by a pin (14). The middle part (18) is pivotable with respect to the tibia part (8) about a centering pin (20), and a stop is pivoted which is dependent...http://www.google.com/patents/US4865606?utm_source=gb-gplus-sharePatent US4865606 - Endoprosthesis for a knee-jointAdvanced Patent SearchPublication numberUS4865606 APublication typeGrantApplication numberUS 07/230,883Publication dateSep 12, 1989Filing dateAug 11, 1988Priority dateAug 13, 1987Fee statusLapsedAlso published asDE3726969C1, EP0303195A1, EP0303195B1Publication number07230883, 230883, US 4865606 A, US 4865606A, US-A-4865606, US4865606 A, US4865606AInventorsGunther RehderOriginal AssigneeFriedrichsfeld Gmbh Keramik Und KunststoffwerkeExport CitationBiBTeX, EndNote, RefManPatent Citations (12), Non-Patent Citations (2), Referenced by (50), Classifications (8), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetEndoprosthesis for a knee-jointUS 4865606 AAbstract An endoprosthesis for a knee joint comprising a femur part (6), a tibia part (8), and a middle part (18) which is articulated on the femur part (6) by a pin (14). The middle part (18) is pivotable with respect to the tibia part (8) about a centering pin (20), and a stop is pivoted which is dependent on the flexion angle. A bearing part (54), acting as artificial meniscus, is arranged between the femur part (6) and the middle part (18), and has a first guide element (56) coaxial to the flexion axis and in engagement with the bearing member (58) of the femur part (6). The bearing part (54) is displaceable with respect to the middle part (18) and also comprises a second guide element (60) in engagement with a guide track (62) of the middle part (18); the pin (14) is arranged eccentric to the bearing member (58), and movement of the flexion axis is forced along an evolute curve. The invention avoids localized load peaks while accomplishing the physiological functions of the knee joint during movement and load.
What is claimed is: 1. An endoprosthesis for a knee joint, comprising a femur part (6), a tibia part (8), a middle part (18) movably connected to the femur part (6) via a pin (14), a centering pin (20) arranged between the middle part (18) and the tibia part (8) about which the middle part (18) is pivotably mounted with respect to the tibia part (8), and a stop for the femur part (6) whose pivoting movement with respect to the centering pin (20) is limited in the extended position, said stop being dependent on the. flexion angle, said femur part (6) being pivotable with respect to the tibia part (8) about an essentially horizontal flexion axis and having a curved bearing element (58); wherein a bearing part (54), which acts as an artificial meniscus, is arranged between the femur part (6) and the middle part (18), said bearing part (54) being displaceable with respect to the middle part (18) in a plane orthogonal to the centering pin (20) and having a first guide element (56) engaging the bearing element (58) of the femur part (6) and a second guide element (60) engaging a guide track (62) of the middle part (18), and wherein said pin (14) is arranged eccentric to the center axis (23) of the bearing member (58) of the femur part in such a way that, upon flexing, the flexion axis is movable along an evolute curve.
BACKGROUND OF THE INVENTION The present invention relates to an endoprosthesis for a knee joint having a femur part, a tibia part and a middle part which is movably connected to the femur part via a preferably horizontally arranged pin, wherein the femur part is pivotable with respect to the tibia part about an essentially horizontal flexion axis and has a curved bearing member and also a centering pin is arranged between the middle part and the tibia part, about which centering pin the middle part is pivotably mounted with respect to the tibia part, and furthermore having a stop, which is dependent on the flexion angle, for the femur part whose pivoting movement with respect to the centering pin is limited in the extended position.
U.S. Pat. No. 4,112,522 discloses an endoprosthesis of the foregoing general type having a femur part, an intermediate part and a tibia part which has a range of movement about the flexion axis of -5� to +145�. The rotation of the lower leg is controllable by means of the flexion axis pin whose middle area forms a stop, which is dependent on the flexion angle, for the pivoting movement of the centering pin which is rotationally fixedly connected to the tibia part. In addition, the middle part is designed as an eccentric rotational element which bears in a recess of the centering pin, the pin axis being spaced a distance from the flexion axis and being arranged essentially at a right angle to the latter. The middle part has bearing surfaces, coaxial to the flexion axis, for similarly coaxial bearing bushes on the femur part. The defined specification of the flexion axis independent of the flexion angle does not correspond to physiological kinematics. There is a risk of very high and unacceptable peak loads occurring as a result of the contact of the bearing surfaces between femur part and tibia part being only in line-form and, in extreme cases, even in point-form. Such peak loads are disadvantageous with respect to durability and operational capacity.
SUMMARY OF THE INVENTION It is the object of the present invention to provide an improved endoprosthesis for a knee joint.
BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained in further detail with reference to illustrative embodiments shown in the accompanying drawings, in which:
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS FIG. 1 shows part of the femur 2 and tibia 4 into which the femur part 6 and the tibia part 8 are anchored respectively by means of connecting rods 10 and 12. The femur part 6 comprises a pin 14 which is guided in a recess 16 formed as an elongated slot in a middle part 18. The middle part 18 has a centering pin 20 engaging in the tibia part 8, the rotation of the tibia part 8 and thus of the lower leg about this centering pin 20 being controlled in dependence on the flexion. In this respect, the illustrated design of the guide of the pin 14 in the recess 16, which is formed as an elongated slot, is not to be construed as limiting. Within the scope of the invention a straight elongated slot, a straight groove or even an elongated slot provided with a different curvature can be provided for guiding pin 14.
FIG. 7 shows a view of the tibial cage 32 in viewing direction VII according to FIG. 5, with the two control paths 106 for the pins of the respective bearing parts now also being clearly seen. The ball bearings 86 are also shown for the purpose of illustrating the interrelationships. In the extended position the two ball bearings 86 in the respective control path 106 assume the end position toward the left of the drawing and, by means of the stop thus formed, a pivoting of the tibial cage 32 about the axis vertical to the plant of projection is blocked. According to the invention, during flexion the two bearing parts and, consequently, also the pin 64 with the bearings 86 execute in each case a translational movement perpendicular to the centering pin, as is indicated by the arrow 108. In the maximum flexion position the two pins have assumed the position indicated by the broken line 64 and now permit the rotation of the tibia part about an angle of approximately 15�. The two control pats 106 are cut out of the tibia part 32 from above, with the outer edges 110 lying coaxial to the bore 34.
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