Source: http://www.google.se/patents/US8192498?hl=sv
Timestamp: 2013-05-25 21:32:59
Document Index: 564642949

Matched Legal Cases: ['Application No. 06739287', 'Application No. 08164944', 'Application No. 08253140', 'Application No. 09164160', 'Application No. 09164168', 'Application No. 09164228', 'Application No. 09164235', 'Application No. 09164245', 'Application No. 09164478', 'Application No. 09164478', 'Application No. 10162138', 'Application No. 11150648', 'Application No. 11150648', 'Application No. 10174439', 'Application No. 09164235', 'Application No. 10174439', 'Application No. 10174440', 'Application No. 2009']

Patent US8192498 - Posterior cructiate-retaining orthopaedic knee prosthesis having controlled ... - Google PatentS�k Bilder Kartor Play YouTube Nyheter Gmail Drive Mer » Avancerad patents�kning | Webbhistorik | Logga in Avancerad patents�kning PatentAn orthopaedic knee prosthesis includes a tibial bearing and a femoral component configured to articulate with the tibial bearing. The femoral component includes a condyle surface curved in the sagittal plane. The radius of curvature of the condyle surface decreases gradually between early-flexion and...http://www.google.se/patents/US8192498?utm_source=gb-gplus-sharePatent US8192498 - Posterior cructiate-retaining orthopaedic knee prosthesis having controlled condylar curvature PublikationsnummerUS8192498 B2Typ av kung�relseBeviljande Ans�kningsnummer12/165,574 Publiceringsdatum5 jun 2012 Registreringsdatum30 jun 2008�ven publicerat somCN101669844AEP2147660A1EP2275053A1EP2275054A1US20090326664US20120239158 UppfinnareJohn M. ArmacostSaid T. GomaaJordan S. LeeDimitri SokolovChristel M. WagnerJohn L. Williams Ursprunglig innehavareDepuy Products, Inc. USA-klassificering623/20.21623/20.31 Internationell klassificeringA61F2/38 Kooperativ klassningA61F2220/0033A61F2002/30332A61F2/3868A61F2230/0006A61F2002/30116A61F2310/00179A61F2/38 Europeisk klassificeringA61F2/38A61F2/38KH�nvisningarCitat fr�n andra k�llor (96) H�nvisningar finns i f�ljande patent (3)Externa l�nkarUSPTO �verl�telse av �gander�tt till patent som har registrerats av USPTO EspacenetPosterior cructiate-retaining orthopaedic knee prosthesis having controlled condylar curvatureUS 8192498 B2 Sammanfattning An orthopaedic knee prosthesis includes a tibial bearing and a femoral component configured to articulate with the tibial bearing. The femoral component includes a condyle surface curved in the sagittal plane. The radius of curvature of the condyle surface decreases gradually between early-flexion and mid-flexion. Additionally, in some embodiments, the radius of curvature may be increased during mid-flexion.
CROSS-REFERENCE TO RELATED U.S. PATENT APPLICATION Cross-reference is made to U.S. Utility patent application Ser. No. 12/165,575 entitled �Posterior Stabilized Orthopaedic Knee Prosthesis Having Controlled Condylar Curvature� by Joseph G. Wyss, which was filed on Jun. 30, 2008; to U.S. Utility patent application Ser. No. 12/165,579 entitled �Orthopaedic Femoral Component Having Controlled Condylar Curvature� by John L. Williams, which was filed on Jun. 30, 2008; to U.S. Utility patent application Ser. No. 12/165,582 entitled �Posterior Stabilized Orthopaedic Prosthesis� by Joseph G. Wyss, which was filed on Jun. 30, 2008; and to U.S. Utility patent application Ser. No. 12/488,107 entitled �Orthopaedic Knee Prosthesis Having Controlled Condylar Curvature� by Mark A. Heldreth which was filed on Jun. 19, 2009; the entirety of each of which is incorporated herein by reference.
SUMMARY According to one aspect, an orthopaedic knee prosthesis may include a femoral component and a tibial bearing. In some embodiments, the femoral component may be embodied as a posterior cruciate-retaining femoral component. The femoral component may include a condyle surface curved in the sagittal plane. The tibial bearing may include a bearing surface configured to articulate with the condyle surface of the femoral component. In some embodiments, the condyle surface of the femoral component may contact the bearing surface at a first contact point on the condyle surface at a first degree of flexion and contact the bearing surface at a second contact point on the condyle surface at a second degree of flexion. The first degree of flexion may be less than about 30 degrees. For example, the first degree of flexion may be in the range of 0 degrees to 10 degrees. The second degree of flexion may be in the range of 45 degrees to 90 degrees. For example, the second degree of flexion may be in the range of 60 degrees to 90 degrees. In one particular embodiment, the first degree of flexion is about 5 degrees and the second degree of flexion is about 65 degrees.
The amount of increase between the radius of curvature R2 and the radius of curvature R3, as well as, the degree of flexion on the condyle surface 100 at which such increase occurs has been determined to affect the occurrence of paradoxical anterior translation. As discussed in more detail in the U.S. patent application Ser. No. 12/165,579, entitled �Orthopaedic Femoral Component Having Controlled Condylar Curvature�, which was filed concurrently herewith and is hereby incorporated by reference, multiple simulations of various femoral component designs were performed using the LifeMOD/Knee Sim, version 2007. 1.0 Beta 16 software program, which is commercially available from LifeModeler, Inc. of San Clemente, Calif., to analyze the effect of increasing the radius of curvature of the condyle surface of the femoral components in early and mid flexion. Based on such analysis, it has been determined that paradoxical anterior sliding of the femoral component relative to the tibial bearing may be reduced or otherwise delayed by increasing the radius of curvature of the condyle surface by an amount in the range of about 0.5 millimeters to about 5 millimeters at a degree of flexion in the range of about 30 degrees of flexion to about 90 degrees of flexion.
Similarly, the positioning and size of the curved surface sections 106 and 108 are determined, at least in part, on the positioning and size of the curved surface section 104. Additionally, the positioning and size of the curved surface sections 106 and 108 are based on or otherwise limited by the anatomical restraints of the joint space of the knee. That is, the overall size and configuration of the posterior side of the condyle surface 100 of the femoral component 12 is designed such that the femoral component 12 �fits� into the joint space of a knee and allows the femoral component 12 to be properly secured to a patient's surgically-prepared distal femur. As such, in one embodiment, the curved surface section 106 extends from a first degree of flexion in the range of about 45 degrees to about 90 degrees to a second degree of flexion in the range of about 80 degrees to about 110 degrees. In one particular embodiment, the curved surface section 106 extends from about 65 degrees of flexion to about 90 degrees of flexion. Similarly, in one embodiment, the curved surface section 108 extends from a first degree of flexion in the range of about 80 degrees to about 110 degrees to a second degree of flexion in the range of about 90 degrees to about 120 degrees. In one particular embodiment, the curved surface section 106 extends from about 90 degrees of flexion to about 105 degrees of flexion.
−0.30<b<0.00,0.00<b<0.30, orb=0 (4)
0.00<c<0.012, and−0.00015<d<0.00. (5)
−0.010<c<0.00, and−0.00015<d<0.00. (6)
−0.0020<c<0.00, or0.00<c<0.0025, and−0.00015<d<0.00. (7)
It should be appreciated that ranges of values for the scalar �a� and coefficients �b�, �c�, and �d� are a subset of an infinite number of possible solutions for the polynomial equation (3). That is, the particular set of ranges provided above have been determined from an infinite number of possibilities to generate a family of curves (i.e., the curved surface section 104) that provide a gradual transitioning of the condyle surface 100 from the radius of curvature R1 to the radius of curvature R2 such that anterior translation of the femoral component 12 relative to the tibial bearing 14 is reduced or delayed. Additionally, it should be appreciated that the range of values for each coefficient �a�, �b�, �c�, and �d� are provided above in regard to embodiments designed using the metric system of units. However, such range of coefficient values may be converted for use in embodiments using other systems of units such as the English system of units.
It should be appreciated that the distance 124 between the common origin O and the origin 122 of the radius of curvature R1 and the particular coefficient values may be dependent upon the particular size of the femoral component 12 in some embodiments. For example, as illustrated in FIG. 12, a table 700 illustrates one particular embodiment of coefficient values for the above-defined polynomial equation (3) and values for the distance 124 defined between the common origin O and the origin 122 of the radius of curvature R1. As shown in table 700, the distance 124 between the common origin O and the origin 122 of the radius of curvature R1 and the value for the scalar �a� change across the femoral component sizes. However, in this particular embodiment, the values for the coefficients �b�, �c�, and �d� are constant across the femoral component sizes. It should be appreciated, however, that in other embodiments, the coefficient values �b�, �c�, and �d� may change across the femoral component sizes.
As such, in embodiments wherein the condyles 52, 54 are symmetrical, the curved surface sections 202, 802 extend between degrees of flexion that are substantially equal (i.e., each of the curved surface section 202, 802 may extend from a substantially equal earlier degree of flexion to a substantially equal later degree of flexion). Similarly, the curved surface sections 204, 804 extend between degrees of flexion that are substantially equal, the curved surface sections 206, 806 extend between degrees of flexion that are substantially equal, and the curved surface sections 208, 808 extend between degrees of flexion that are substantially equal. Additionally, the radius of curvature R5 is substantially equal to the radius of curvature R1, the radius of curvature R6 is substantially equal to the radius of curvature R2, the radius of curvature R7 is substantially equal to the radius of curvature R3, and the radius of curvature R8 is substantially equal to the radius of curvature R4. Further, the set of coefficient values �a�, b�, �c�, and/or �d� of the equation (4) described above are substantially similar for both condyles.
Additionally, in those embodiments wherein the condyles 52, 54 are asymmetrical, the radius of curvature R5 may be different from the radius of curvature R1, the radius of curvature R6 may be different from the radius of curvature R2, the radius of curvature R7 may be different from the radius of curvature R3, and/or the radius of curvature R8 may be different from the radius of curvature R4. Further, the set of coefficient values �a�, b�, �c�, and/or �d� of the equation (3) described above may be different between the condyle surfaces 100 and 800.
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