Source: http://www.freepatentsonline.com/9398956.html
Timestamp: 2019-10-22 19:12:11
Document Index: 617353478

Matched Legal Cases: ['artz 623', 'artz\n5732469', 'Application No. 09170648', 'Application No. 09170648', 'Application No. 08164944', 'Application No. 08164944', 'Application No. 08253140', 'Application No. 10188962', 'Application No. 10188963', 'Application No. 10189698']

Fixed-bearing knee prosthesis having interchangeable components - DEPUY (IRELAND)
United States Patent 9398956
Deffenbaugh, Daren L. (Winona Lake, IN, US)
Bryant, Jack T. (Warsaw, IN, US)
Meier, Rusty T. (Warsaw, IN, US)
13/788935
A61F2/38; A61F2/30; A61F2/42
623/20.14, 623/20.15, 623/20, 623/20.31, 623/20.33
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1. A fixed-bearing knee prosthesis, comprising: a femoral component having a medial condyle surface and a lateral condyle surface, a bearing having (i) a medial bearing surface configured to articulate with the medial condyle surface of the femoral component, and (ii) a lateral bearing surface configured to articulate with the lateral condyle surface of the femoral component, and a tibial tray secured to the bearing, the tibial tray having a platform with a fixation member extending downwardly from a lower surface thereof, the platform having (i) a posterior buttress extending along a posterior section of a perimeter of the platform and extending upwardly from an upper surface of the platform, (ii) an anterior buttress extending along an anterior section of the perimeter of the platform and extending upwardly from the upper surface of the platform, and (iii) an elongated bore having a superior end that opens into an upper surface of the posterior buttress, wherein the anterior buttress has (i) a first arm extending along an anterior edge of the platform, (ii) a second arm extending along the anterior edge of the platform in a direction away from the first arm of the anterior buttress, the second arm being contiguous with the first arm, and (iii) an undercut defined therein, wherein the posterior buttress is generally Y-shaped and has (i) a first arm extending along a posterior edge of the platform and having a first undercut defined therein, (ii) a second arm extending along the posterior edge of the platform in a direction away from the first arm and having a second undercut defined therein, and (iii) a third arm extending anteriorly away from the first arm and the second arm, and wherein (i) a first imaginary line extends along a lateral-most edge of the first arm of the posterior buttress, (ii) a second imaginary line extends along a medial-most edge of the second arm of the posterior buttress and intersects the first imaginary line to define an angle of intersection therebetween, and (iii) the angle of intersection is between 45-145°.
5. The knee prosthesis of claim 1, wherein: the fixation member of the tibial tray comprises an elongated stem extending downwardly from the lower surface of the platform, and the elongated bore extends away from the upper surface of the posterior buttress in the direction toward a distal end of the stem.
7. The knee prosthesis of claim 1, wherein: a third imaginary line extends in a medial/lateral direction and bisects the third arm of the posterior buttress so as to divide the third arm of the posterior buttress into an anterior half and a posterior half, and the superior end of the elongated bore of the tibial tray opens into the upper surface of the posterior buttress at a location in the anterior half of the third arm of the posterior buttress.
8. The knee prosthesis of claim 1, wherein: the bearing has an upper surface and a lower surface, both the medial bearing surface and the lateral bearing surface are defined in the upper surface of the bearing, the lower surface of the bearing contacts the upper surface of the platform, the lower surface of the platform has a posterior recess and an anterior recess formed therein, and the posterior buttress is positioned in the posterior recess and the anterior buttress is positioned in the anterior recess.
10. A fixed-bearing knee prosthesis, comprising: a femoral component having a medial condyle surface and a lateral condyle surface, a bearing having (i) a medial bearing surface configured to articulate with the medial condyle surface of the femoral component, and (ii) a lateral bearing surface configured to articulate with the lateral condyle surface of the femoral component, and a tibial tray secured to the bearing, the tibial tray having a platform with a fixation member extending downwardly from a lower surface thereof, the platform having (i) a posterior buttress extending along a posterior section of a perimeter of the platform and extending upwardly from an upper surface of the platform, (ii) an anterior buttress extending along an anterior section of the perimeter of the platform and extending upwardly from the upper surface of the platform, and (iii) an elongated bore having a superior end that opens into an upper surface of the posterior buttress, wherein the posterior buttress is generally Y-shaped and has (i) a first arm extending along a posterior edge of the platform and having a first undercut defined therein, (ii) a second arm extending along the posterior edge of the platform in a direction away from the first arm and having a second undercut defined therein, and (iii) a third arm extending anteriorly away from the first arm and the second arm, wherein the anterior buttress has (i) a first arm extending along an anterior edge of the platform, (ii) a second arm extending along the anterior edge of the platform in a direction away from the first arm of the anterior buttress, and (iii) an undercut defined therein, and wherein (i) an imaginary line extends along a posterior-most edge of the first arm of the anterior buttress and a posterior-most edge of the second arm of the anterior buttress, and (ii) the imaginary line defines a curve having a constant radius.
12. The knee prosthesis of claim 10, wherein: the fixation member of the tibial tray comprises an elongated stem extending downwardly from the lower surface of the platform, and the elongated bore extends away from the upper surface of the posterior buttress in the direction toward a distal end of the stem.
14. The knee prosthesis of claim 10, wherein: a third imaginary line extends in a medial/lateral direction and bisects the third arm of the posterior buttress so as to divide the third arm of the posterior buttress into an anterior half and a posterior half, and the superior end of the elongated bore of the tibial tray opens into the upper surface of the posterior buttress at a location in the anterior half of the third arm of the posterior buttress.
15. The knee prosthesis of claim 10, wherein: the bearing has an upper surface and a lower surface, both the medial bearing surface and the lateral bearing surface are defined in the upper surface of the bearing, the lower surface of the bearing contacts the upper surface of the platform, the lower surface of the platform has a posterior recess and an anterior recess formed therein, and the posterior buttress is positioned in the posterior recess and the anterior buttress is positioned in the anterior recess.
17. A fixed-bearing knee prosthesis, comprising: a femoral component having a medial condyle surface and a lateral condyle surface, a tibial tray having a platform with a fixation member extending downwardly from a lower surface thereof, the platform having (i) a generally Y-shaped posterior buttress extending upwardly from an upper surface of the platform and having a pair of arms extending along a posterior section of a perimeter of the platform, each of the pair of arms having an undercut defined therein, and (ii) an anterior buttress extending along an anterior section of the perimeter of the platform and extending upwardly from the upper surface of the platform, the anterior buttress being discontiguous with the posterior buttress and having an undercut defined therein, and (iii) an elongated bore having a superior end that opens into an upper surface of the posterior buttress, and a plurality of bearings configured to be separately secured to the tibial tray, wherein each of the plurality of bearings has (i) a width that is different from at least some of the other of the plurality of bearings, (ii) an upper surface having a medial bearing surface configured to articulate with the medial condyle surface of the femoral component and a lateral bearing surface configured to articulate with the lateral condyle surface of the femoral component, (iii) a lower surface having a posterior recess defined therein to receive the posterior buttress and an anterior recess defined therein to receive the anterior buttress, (iv) a pair of posterior locking tabs arranged to be respectively received in the undercuts defined in each of the pair of arms of the posterior buttress, and (v) an anterior locking tab arranged to be received in the undercut defined in the anterior buttress.
18. The knee prosthesis of claim 17, wherein: the fixation member of the tibial tray comprises an elongated stem extending downwardly from the lower surface of the platform, and the elongated bore extends away from the upper surface of the posterior buttress in the direction toward a distal end of the stem.
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