Source: https://patents.google.com/patent/USRE44476E1/en
Timestamp: 2018-06-18 10:03:26
Document Index: 405415808

Matched Legal Cases: ['Application No. 02250512', 'Application No. 10012582', 'Application No. 10012581', 'Application No. 2', 'Application No. 10', 'Application No. 2']

USRE44476E1 - Constrained prosthetic knee with rotating bearing - Google Patents
USRE44476E1
USRE44476E1 US12776224 US77622410A USRE44476E1 US RE44476 E1 USRE44476 E1 US RE44476E1 US 12776224 US12776224 US 12776224 US 77622410 A US77622410 A US 77622410A US RE44476 E1 USRE44476 E1 US RE44476E1
US12776224
FIGS. 13 and 14 illustrate an alternative embodiment of the knee prosthesis of the current invention. This alternative embodiment utilizes hinge post extension 42a having locking taper 46a, cylindrical extension 48a, and flange 106. In this embodiment, a locking instrument may be utilized to apply force atop hinge post extension 42a so that locking taper 46a is seated in elongate hinge post extension aperture 112 and locked therein. Flange 106 may be utilized to facilitate removal of hinge post extension 42a. As illustrated in FIG. 13, set screw 108 may be utilized as a secondary lock for hinge post extension 42a. In all other respects, the knee prosthesis illustrated in FIGS. 13 and 14 is constructed as described above with respect to the first embodiment of the knee prosthesis in accordance with the present invention.
FIGS. 15, 16 and 17 illustrate an alternative embodiment of the hinge post extension and tibial bushing of the present invention. In this embodiment, tibial component 24a includes annular tibial bushing expansion groove 122 formed in hinge post extension aperture 110. Tibial bushing 64a includes retaining flange 130 positioned within annular tibial bushing expansion groove 122. FIG. 15 illustrates insertion of cylindrical extension 48b of the hinge post extension into tibial bushing 64a positioned within tibial component 24a. As cylindrical extension 48b proceeds into tibial bushing 64a, bevel 126 contacts annular locking protrusion 128 of tibial bushing 64a and causes outward movement of retaining flange 130 to allow cylindrical extension 48b to proceed to its seated position as illustrated in FIG. 17. Annular tibial bushing expansion groove 122 is sized to allow radial expansion of retaining flange 130 to accommodate placement of cylindrical extension 48b within tibial bushing 64a. In the fully seated position (FIG. 17) cylindrical extension 48b is locked in place by the engagement of annular locking protrusion 128 in annular locking groove 124. Furthermore, retaining flange 130 cooperates with annular tibial bushing expansion groove 122 to prohibit axial displacement of tibial bushing 64a and, consequently, cylindrical extension 48b. In this embodiment, the femoral component is retained in abutting relationship to the meniscal component and lift off of the femoral component is substantially prohibited. Tibial bushing 64a is, in one exemplary embodiment, formed of UHMWPE
FIGS. 18 and 19 illustrate another alternative embodiment of the knee prosthesis of the current invention. In this embodiment, locking clip 134 is utilized to retain the position of hinge post 40b within hinge post aperture 114 of meniscal component 26a. Hinge post 40b is rotatably attached to femoral component 22 utilizing hinge pin 34 as described above. In this embodiment, hinge post 40b includes locking clip grooves 132, and meniscal component 26a includes locking clip apertures 136. Upon positioning of hinge post 40b within hinge post aperture 114, locking clip 134 is positioned as illustrated in FIG. 19 with each prong of locking clip 134 being inserted into locking clip apertures 136 of meniscal component 26a. As illustrated in FIG. 19, locking clip 134 engages locking clip grooves 132 to retain hinge post 40b within hinge post aperture 114 of meniscal component 26a. In this embodiment, lift off of femoral component 22 is prohibited by the engagement of hinge post 40b with meniscal component 26a. This embodiment of the knee prosthesis of the current invention may further utilize a meniscal component cutout together with a rotation protrusion on the tibial component to resist lifting of the meniscal component from the tibial tray as described above.
FIG. 20 illustrates a further alternative embodiment of the hinge post of the present invention. Hinge post 40c illustrated in FIG. 20 includes reinforcing material 138 to strengthen hinge post 40c.
2. The prosthetic femoral component of claim 1, further comprising: A prosthetic knee assembly, comprising:
a hinge post positioned between the first internal side wall and the second internal side wall of the femoral component body and having a longitudinal hinge post axis, said hinge pin fixed to said femoral component body and passing through a hinge pin aperture in said hinge post for rotatably, hingedly connecting said hinge post to said femoral component body so that rotation of said hinge post relative to said femoral component body is defined about the longitudinal hinge pin axis, said hinge post including an elongate hinge post extension aperture along said longitudinal hinge post axis, said elongate hinge post extension aperture transverse to said longitudinal hinge pin axis; and
a hinge post extension removeably locked to said hinge post, said elongate hinge post extension aperture of said hinge post sized for placement of said hinge post extension therein, whereby said hinge post extension traverses a first end of said elongate hinge post extension aperture of said hinge post and protrudes from a second end of said elongate hinge post extension aperture of said hinge post.
3. The prosthetic femoral component knee assembly of claim 2, further comprising:
securing means for securing said hinge post extension to said hinge post further comprising a tibial component into which the hinge post extension can be received, wherein, when the femoral component is attached to a femur and the tibial component is attached to a tibia opposite the femur, said hinge post extension can be separated from said hinge post to allow rotation of said hinge post about said longitudinal hinge pin axis without having to rotate the femur or tibia about said longitudinal hinge pin axis.
4. The prosthetic femoral component knee assembly of claim 3, wherein said securing means comprises:
a female taper positioned in said elongate aperture, said male taper engageable in said female taper to secure said hinge post extension to said hinge post 2 including cooperating locking tapers removeably locking the hinge post extension to the hinge post.
5. The prosthetic femoral component knee assembly of claim 1 2, further comprising:
6. The prosthetic femoral component knee assembly of claim 5, wherein said predetermined point of hyperextension comprises four degrees of hyperextension of the prosthetic knee femoral component body.
7. The prosthetic femoral component knee assembly of claim 5, wherein said hyperextension stop comprises a convex protrusion.
8. The prosthetic femoral component knee assembly of claim 5, wherein said hinge post includes an internal wall, said hyperextension stop surface comprising said internal wall of said hinge post.
10. The prosthetic femoral component of claim 9, further comprising: A prosthetic knee assembly, comprising:
a hinge post rotatably connected to said femoral component body about a rotational axis;
a bearing box connected to said femoral component body, said bearing box interposed between said hinge post and said femoral component body, said bearing box including a hyperextension stop, said hinge post including a hyperextension stop surface, said hyperextension stop contacting said hyperextension stop surface to prevent further hyperextension of the prosthetic femoral component body beyond a predetermined point of hyperextension; and
a hinge post extension having a longitudinal axis and being removeably locked to said hinge post, an elongate aperture of said hinge post sized for placement of said hinge post extension therein, whereby said hinge post extension traverses a first end of said elongate aperture of said post and protrudes from a second end of said elongate aperture of said hinge post, wherein the longitudinal axis of said hinge post extension is non-intersecting with said rotational axis.
11. The prosthetic femoral component knee assembly of claim 10, further comprising:
12. The prosthetic femoral component knee assembly of claim 11, wherein said securing means comprises:
13. The prosthetic femoral component knee assembly of claim 9 10, wherein said predetermined point of hyperextension comprises four degrees of hyperextension of the prosthetic femoral component body.
14. The prosthetic femoral component knee assembly of claim 9 10, wherein said hyperextension stop comprises a convex protrusion.
15. The prosthetic femoral component knee assembly of claim 9 10, wherein said hinge post includes an internal wall, said hyperextension stop surface comprising said internal wall of said hinge post.
a meniscal component positioned between said femoral component and said tibial component, said femoral component including a condylar bearing surface, said meniscal component including a cooperative bearing surface facing said condylar bearing surface of said femoral component for contacting said condylar bearing surface, said femoral component rotatably connected to said tibial component;
a hinge post rotatably connected to said femoral component which includes said hinge pin passing through a hinge pin aperture in said hinge post for rotatably, hingedly connecting said hinge post to said femoral component so that rotation of said hinge post relative to said femoral component is defined about the longitudinal hinge pin axis, said meniscal component including an a hinge post aperture with a longitudinal hinge post aperture axis that is non-intersecting with said longitudinal hinge pin axis, said hinge post positioned within said hinge post aperture; and
a femoral component having a hinge post rotatably connected thereto about a rotational axis;
a meniscal component positioned between said femoral component and said tibial component, said femoral component including a condylar bearing surface, said meniscal component including a cooperative bearing surface facing said condylar bearing surface of said femoral component for contacting said condylar bearing surface, said meniscal component including an a hinge post aperture having a longitudinal axis that is non-intersecting with said rotational axis, whereby said hinge post is positioned within said hinge post aperture when the prosthetic knee is operably assembled; and
19. The prosthetic femoral component of claim 2, wherein said first end of said elongate aperture of said hinge post is positioned closer to said hinge pin than said second end of said elongate aperture so that said hinge post extension protrudes from said second end of said elongate aperture of said hinge post in a direction away from said hinge pin.
20. The prosthetic femoral component of claim 10, wherein said first end of said elongate aperture of said hinge post is positioned closer to said femoral component body than said second end of said elongate aperture of said hinge post so that said hinge post extension protrudes from said second end of said elongate aperture of said hinge post in a direction away from said femoral component body.
21. The prosthetic femoral component of claim 2, wherein said hinge pin includes a hexagonal indentation on a first end thereof, said first end being flush with said femoral component, said prosthetic femoral component further comprising a hinge pin plug positioned within said hexagonal indentation and being flush with said first end of said hinge pin.
22. The prosthetic femoral component of claim 2, wherein said longitudinal hinge post axis is non-intersecting with said longitudinal hinge pin axis.
US12776224 2001-01-29 2010-05-07 Constrained prosthetic knee with rotating bearing Active USRE44476E1 (en)
US10234362 Reissue US6773461B2 (en) 2001-01-29 2002-09-04 Constrained prosthetic knee with rotating bearing
USRE44476E1 true USRE44476E1 (en) 2013-09-03
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