Source: http://www.google.es/patents/US9204967
Timestamp: 2017-10-23 06:32:48
Document Index: 424360783

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

Patente US9204967 - Fixed-bearing knee prosthesis having interchangeable components - Google Patentes
A fixed-bearing prosthesis includes a femoral component having a medial condyle surface and a lateral condyle surface. The knee prosthesis also includes a bearing having a medial bearing surface configured to articulate with the medial condyle surface of the femoral component, and a lateral bearing surface...http://www.google.es/patents/US9204967?utm_source=gb-gplus-sharePatente US9204967 - Fixed-bearing knee prosthesis having interchangeable components
Número de publicación US9204967 B2
Número de solicitud US 13/788,921
También publicado como US20130184829
Número de publicación 13788921, 788921, US 9204967 B2, US 9204967B2, US-B2-9204967, US9204967 B2, US9204967B2
Inventores Joseph G. Wyss, Stephen A. Hazebrouck, Daren L. Deffenbaugh, Mark A. Heldreth
Citas de patentes (555), Otras citas (26), Citada por (2), Clasificaciones (19), Eventos legales (2)
US 9204967 B2
a bearing having (i) a medial bearing surface configured to articulate with the medial condyle surface of the femoral component, (ii) a lateral bearing surface configured to articulate with the lateral condyle surface of the femoral component, and (iii) a reinforcing pin extending downwardly from a lower surface of the bearing, the reinforcing pin having a substantially smooth cylindrical surface extending from the lower surface to a distal tip, 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, the reinforcing pin of the bearing being positioned in the elongated bore,
4. The knee prosthesis of claim 1, wherein the superior end of the elongated bore opens into the third arm of the posterior buttress such that the reinforcing pin extends through the third arm.
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 into the stem such that the reinforcing pin is positioned in the stem.
a first flexible posterior tab positioned in the first undercut defined in the first arm of the posterior buttress,
a second flexible posterior tab positioned in the second undercut defined in the second arm of the posterior buttress, and
a flexible anterior tab positioned in the undercut defined in the anterior buttress.
the bearing includes a posterior-stabilizing spine extending from an upper surface of the bearing,
both the medial bearing surface and the lateral bearing surface are defined in the upper surface of the bearing, and
the posterior-stabilizing spine is positioned between the medial bearing surface and the lateral bearing surface.
the lower surface of the platform has a posterior recess and an anterior recess formed therein,
the reinforcing pin extends out of the posterior recess, and
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.
11. The knee prosthesis of claim 10, wherein the superior end of the elongated bore opens into the third arm of the posterior buttress such that the reinforcing pin extends through the third arm.
12. The knee prosthesis of claim 10, wherein:
16. The knee prosthesis of claim 10, wherein the posterior buttress is discontiguous with the anterior buttress.
17. The knee prosthesis of claim 10, wherein the anterior locking tab and the pair of posterior locking tabs of each of the plurality of revision bearings comprise a flexible, deflectable tab.
18. A fixed-bearing knee prosthesis, comprising:
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,
a plurality of revision bearings configured to be separately secured to the tibial tray, wherein each of the plurality of revision bearings has (i) a width that is different from at least some of the other of the plurality of revision 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 reinforcing pin extending out of the posterior recess, the reinforcing pin having a substantially smooth cylindrical surface extending from a base surface of the revision bearing to a distal tip, (v) 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 (vi) an anterior locking tab arranged to be received in the undercut defined in the anterior buttress, and
a plurality of primary bearings configured to be separately secured to the tibial tray, wherein each of the plurality of primary bearings has (i) a width that is different from at least some of the other of the plurality of primary 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, the lower surface being devoid of a reinforcing pin, (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.
19. The knee prosthesis of claim 18, wherein:
the elongated bore extends into the stem such that the reinforcing pin is positioned in the stem when one of the plurality of revision bearings is secured to the tibial tray.
This application is a continuation-in-part of copending U.S. patent application Ser. No. 12/904,614 filed Oct. 14, 2010, which is a continuation-in-part of U.S. Pat. No. 8,128,703 filed on Nov. 17, 2009, which is a continuation-in-part of U.S. Pat. No. 7,628,818 filed on Sep. 28, 2007. The entirety of each of those applications is expressly incorporated herein by reference.
According to one aspect, a fixed-bearing knee prosthesis includes a femoral component having a medial condyle surface and a lateral condyle surface. The prosthesis also includes a bearing 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. A tibial tray is secured to the bearing. The tibial tray has a platform with an elongated stem extending downwardly from a lower surface thereof. The platform has a posterior buttress extending along a posterior section of a perimeter of the platform and extending upwardly from an upper surface of the platform. An anterior buttress extends along an anterior section of the perimeter of the platform and upwardly from the upper surface of the platform. The tibial tray also has an elongated bore that opens into the upper surface of the posterior buttress.
According to another aspect, a fixed-bearing knee prosthesis includes a femoral component having a medial condyle surface and a lateral condyle surface. The prosthesis also includes a bearing 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. The bearing also has a reinforcement pin. A tibial tray is secured to the bearing. The tibial tray has a platform with an elongated stem extending downwardly from a lower surface thereof. The platform has a posterior buttress extending along a posterior section of a perimeter of the platform and extending upwardly from an upper surface of the platform. An anterior buttress extends along an anterior section of the perimeter of the platform and upwardly from the upper surface of the platform. The tibial tray also has an elongated bore that opens into the upper surface of the posterior buttress.
According to another aspect, a fixed-bearing knee prosthesis includes a femoral component having a medial condyle surface and a lateral condyle surface, and a tibial tray having a platform with an elongated stem extending downwardly from a lower surface thereof. The platform has a generally Y-shaped posterior buttress extending upwardly from an upper surface of the platform. A pair of arms of the posterior buttress extend along a posterior section of a perimeter of the platform. Each of the pair of arms has an undercut defined therein. The platform also has 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 knee prosthesis also includes a plurality of bearings configured to be secured to the tibial tray. Each of the plurality of bearings has a width that is different from at least some of the other of the plurality of bearings. Each of the plurality of bearings also has 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. A lower surface of each of the plurality of bearings has at least one recess defined therein to receive the posterior buttress and the anterior buttress. Each of the plurality of bearings also includes a pair of posterior tabs arranged to be respectively received in the undercuts defined in the pair of arms of the posterior buttress. The tibial tray also has an elongated bore that opens into the upper surface of the posterior buttress.
FIGS. 6-9 are similar to FIG. 4, but showing different embodiments of the tibial tray;
FIGS. 10-14 are similar to FIGS. 1-5, respectively, but showing another embodiment of a fixed-bearing knee prosthesis;
FIGS. 15 and 16 are bottom perspective views of a revision bearing;
FIG. 17 is a side view showing the angled installation of pin-less primary bearing to the tibial tray;
FIG. 18 is a side view showing the vertical installation of a revision bearing configured with a reinforcement pin to the tibial tray; and
FIG. 19 is an exploded perspective view showing that either a pin-less primary bearing or a revision bearing configured with a reinforcement pin may be secured to the tibial tray.
As can be seen in FIGS. 1, 3-10, and 12-14, the tibial tray 14 has an elongated bore 58 formed therein. A superior end 60 of the elongated bore 58 opens into the upper surface 62 of the posterior buttress 44. In the illustrative embodiments shown in FIGS. 9, 10, and 12-14, the superior end 60 of the elongated bore 58 opens into the third arm 52 of the posterior buttress 44. More particularly, in such illustrative embodiments, the superior end 60 of the elongated bore 58 opens into the anterior end of the third arm 52 of the posterior buttress 44. This is shown geometrically in FIGS. 9 and 13 in which an imaginary line 114 extending in the medial/lateral direction bisects the third arm 52 into an anterior half 116 and a posterior half 118. The superior end 60 of the elongated bore 58 opens into the anterior end of the third arm 52 of the posterior buttress 44 at a location in its anterior half 116.
As can be seen best in FIG. 12, the elongated bore 58 extends in the superior/inferior direction. As a result, the elongated bore 58 extends away from its superior end 60 in the direction toward the distal end 120 of the tibial tray's elongated stem 20.
As shown in FIGS. 15 and 16, the design and interchangeability of the bearing 16 may be utilized in the design of a revision bearing. In the illustrative embodiment described herein, such a revision bearing 16 may include a reinforcing pin 130 that extends downwardly from the bearing's lower surface 36. The reinforcement pin 130 may be of solid construction or may have a bore (not shown) formed therein to accommodate a stiffening pin (not shown) that may be press fit or otherwise inserted into such a bore. The stiffening pin in such an embodiment may be constructed with a metal such as a cobalt chrome alloy.
As can be seen in, for example, FIGS. 18 and 19, the reinforcing pin 130 is received into the elongated bore 58 of the tibial tray. The elongated bore 58 extends through the thickness of the platform 18 and into the stem 20. Since, as described above, the superior end 60 of the elongated bore 58 opens into the anterior end of the third arm 52 of the posterior buttress 44, the reinforcing pin 130 extends through the third arm 52 of the posterior buttress, the platform 18 and into the stem 20. In such a manner, the reinforcing pin 130 is arranged in the superior/inferior direction when the bearing 16 is secured to the tibial tray 14.
Like the other embodiments described herein, the posterior recess 78 of the revision bearing 16 of FIGS. 15, 16, 18, and 19 is configured to compliment the shape of the posterior buttress 44 of the tibial tray 14. That is, when the revision bearing 16 is secured to the tibial tray 14, the sidewalls of the pedestals 34, 38 which define the posterior recess 78 contact the edges of the posterior buttress 44. Because the superior end 60 of the tibial tray's elongated bore 58 opens into the third arm 52 of the posterior buttress 44, the reinforcing pin 130 extends out of the posterior recess 78 of the revision bearing 16 of FIGS. 15, 16, 18, and 19. Specifically, as can be seen in FIGS. 15 and 16, the reinforcing pin 130 extends out of the posterior recess 78 at a location slightly posterior to the anterior-most sidewall that defines the posterior recess 78. In such a way, the reinforcing pin 130 can be advanced into the elongated bore 58 which is similarly positioned slightly posterior to the anterior-most edge of the third arm 52 of the posterior buttress 44 of the tibial tray 14.
As can be seen in FIG. 18, the revision bearing 16 has a posterior-stabilizing spine 132 formed therein. The posterior-stabilizing spine 36 extends upwardly from the bearing's upper surface and is located between the lateral bearing surface 26 and a medial bearing surface 28. The surfaces of the posterior-stabilizing spine 132 define an anterior cam and a posterior cam that engage corresponding cam surfaces defined in the femoral component 12 to provide stability during flexion and extension of the knee prosthesis 10. As shown in FIG. 17, a primary bearing 16 may also be configured with a posterior-stabilizing spine 132. The primary bearing 16 of FIG. 17, like many of the other bearings described herein, is devoid of a reinforcing pin (i.e., it lacks a pin).
As described above and shown in FIG. 17, the pin-less primary bearings 16 described herein may be installed at an angle relative to the platform 18 of the tibial tray 14. In particular, as described above, to secure one of the pin-less primary bearings 16 to the tibial tray 14, the posterior tabs 40 of the bearing 16 are positioned in the posterior undercuts 54, 56 of the tibial tray 14. Thereafter, the anterior portion of the tibial bearing 16 is advanced downwardly toward the tibial tray 14 such that the anterior tab 42 of the tibial bearing 16 is deflected by the anterior buttress 64 and thereafter snapped into the anterior undercut 74 of the anterior buttress thereby securing the bearing 16 to the tray 14. However, in the case of the revision bearing 16 configured with a reinforcing pin 130, the reinforcing pin 130 engages the tibial tray 14 first during such an angled installation thereby preventing the bearing 16 from being installed in a similar manner.
As a result, the revision bearings 16 configured with a reinforcing pin 130 are vertically installed on the tibial tray 14, as shown in FIG. 18. To accommodate such vertical installation, the posterior tabs 40 are configured in a manner similar to the flexible, deflectable anterior tabs 42, as shown in FIGS. 15 and 16. As such, to secure one of the revision bearings 16 configured with a reinforcing pin 130 to the tibial tray 14, the distal tip of the reinforcing pin 130 is aligned with, and inserted into, the superior end 60 of the tibial tray's elongated bore 58. Thereafter, the tibial bearing 16 is advanced downwardly toward the tibial tray 14 such that the bearing's anterior tab 42 and posterior tabs 40 are deflected by the anterior buttress 64 and the posterior buttress 44, respectively, and thereafter snapped into the anterior undercut 74 of the anterior buttress 64 and the posterior undercuts 54, 56 of posterior buttress 44, respectively, thereby securing the bearing 16 to the tray 14.
Like the other embodiments described herein, the general configuration of the recesses 78, 80 and tabs 40, 42 of the revision bearings 16, remain the same across a range of differently-sized bearings 16 to accommodate the interchangeability of various sizes of trays and bearings in a similar manner to as described above in regard to FIGS. 5 and 14. Moreover, as shown in FIG. 19, such a configuration also allows for interchangeability between primary and revision bearings. In other words, both pin-less primary bearings of various sizes and various sizes of revision bearings configured with reinforcement pins can be used with various sizes of the same configuration of the tibial tray 14.
As described herein, the various designs of the knee prosthesis 10 allow for the enhanced interchangeability of differently-sized components. In particular, any one of a plurality of differently-sized bearings may be secured to any one of a plurality of differently-sized tibial trays. In some embodiments, any one of a plurality of differently-sized primary bearings or any one of a plurality of differently-sized revision bearings may be secured to any one of a plurality of differently-sized tibial trays. As a result, articulation surface geometries and other features of the bearing may be enhanced for each size of femoral component. Such interchangeability also allows for smaller size increments in the design of a range of femoral components.
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Clasificación cooperativa A61F2/38, A61F2/389, A61F2002/30604, A61F2002/30968, A61F2250/0024, A61F2002/30332, A61F2002/3092, A61F2002/30013, A61F2002/30878, A61F2002/30957, A61F2310/00796, A61F2220/0025, A61F2/3859, A61F2002/30143, A61F2002/305, A61F2220/0033, A61F2230/0017
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