Knee joint prosthesis

• US 7,497,874 B1
• Filed: 09/03/2004
• Issued: 03/03/2009
• Est. Priority Date: 02/23/2001
• Status: Expired due to Fees

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Metzger, Robert, Hoeppner, Jacy C
• Primary Examiner(s): Pellegrino; Brian E.
• Application Number:
  US10/934,282
• Time in Patent Office: 1,642 Days
• Field of Search: 62/201.5, 62/203.6, 62/203.5, 62/202.5, 62/202.8, 62/202.7, 62/203.1, 62/224.5, 62/234.2
• US Class Current: 623/20.15
• CPC Class Codes: A61F 2/30721 Accessories
• CPC Class Codes: A61F 2/38 for elbows or knees
• CPC Class Codes: A61F 2002/30133 kidney-shaped or bean-shaped
• CPC Class Codes: A61F 2002/30143 hexagonal
• CPC Class Codes: A61F 2002/30154 square
• CPC Class Codes: A61F 2002/30329 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2002/30336 Stepped cones, i.e. having discrete diameter changes
• CPC Class Codes: A61F 2002/30339 Double cones, i.e. connecting element having two conical connections, one at each of its opposite ends
• CPC Class Codes: A61F 2002/30354 Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
• CPC Class Codes: A61F 2002/30357 Stepped cylinders, i.e. having discrete diameter changes
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30476 locked by an additional locking mechanism
• CPC Class Codes: A61F 2002/30538 for adjusting angular orientation
• CPC Class Codes: A61F 2002/30574 with an integral complete or partial collar or flange
• CPC Class Codes: A61F 2002/30594 slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30774 internally-threaded
• CPC Class Codes: A61F 2002/3079 Stepped or enlarged apertures, e.g. having discrete diameter changes
• CPC Class Codes: A61F 2002/30797 : internally-threaded
• CPC Class Codes: A61F 2002/30878 : with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/4638 : Tools for performing screwing, e.g. nut or screwdrivers, or particular adaptations therefor
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 : made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2220/0041 : using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2230/0015 : Kidney-shaped, e.g. bean-shaped
• CPC Class Codes: A61F 2230/0017 : Angular shapes
• CPC Class Codes: A61F 2230/0021 : square
• CPC Class Codes: A61F 2250/0006 : for adjusting angular orientation

Abstract

A modular knee prosthesis includes a femoral stem having a proximal end portion. A femoral component includes a first engagement portion defined thereon wherein the femoral stem is selectively attachable to the first engagement portion of the femoral component. A connecting member includes a first end selectively attachable to the first engagement portion of the femoral component and includes a second engagement portion defined on a second end wherein the femoral stem is selectively attachable to the second engagement portion of the connecting member.

Claims

1. A modular knee prosthesis comprising:

a femoral stem having a proximal end portion defining a first tapered male insertion portion;

a femoral component having a first tapered female receiving portion defined thereon;

an adapter body including a first end defining a second tapered male insertion portion and a second end defining a second tapered female receiving portion, the adapter body connecting said femoral stem and said femoral component and establishing a relative offset between said femoral stem and said first tapered female receiving portion, wherein said first tapered male insertion portion cooperatively mates with said second tapered female receiving portion, and wherein said first tapered female receiving portion cooperatively mates with said second tapered male insertion portion, said adapter body further including a sidewall defining an opening; and

a locking arrangement for coupling said femoral stem to said adapter body, said locking arrangement including a locking element passing through said opening and coupling said femoral stem to said adapter body.

2. The modular knee prosthesis of claim 1 wherein said locking element further couples said femoral stem to said femoral component.

3. The modular knee prosthesis of claim 2 wherein said locking element threadably receives a fastener extending through said femoral component.

4. The modular knee prosthesis of claim 2 wherein said second male tapered insertion portion defines a first axis, and said second female tapered receiving portion defines second axis, said first and second axes being parallel to one another and spaced apart.

5. The modular knee prosthesis of claim 1 wherein said first male tapered insertion portion defines a first Morse taper connection with said second female tapered receiving portion and wherein said second male tapered insertion portion defines a second Morse taper connection with said first female tapered receiving portion.

6. The modular knee prosthesis of claim 1, further comprising a stem insert extending from said proximal end portion of said stem and wherein said locking element engages said stem insert.

7. The modular knee prosthesis of claim 6 wherein said stem insert is threadably received by said proximal end portion of said stem.

8. A modular knee prosthesis comprising:

a femoral stem having a proximal end portion defining a first tapered male insertion portion;

a femoral component having a first tapered female receiving portion defined thereon;

an adapter body including a first end defining a second tapered male insertion portion and a second end defining a second tapered female receiving portion, said second tapered male insertion portion defining a first axis and said second tapered female receiving portion defining a second axis, said first and second axes being parallel to one another and spaced apart, wherein said first tapered male insertion portion cooperatively mates with said second tapered female receiving portion, and wherein said first tapered female receiving portion cooperatively mates with said second tapered male insertion portion, thereby establishing a relative offset between said first tapered male insertion portion and said first tapered female receiving portion, said adapter body further including a sidewall defining an opening; and

a locking arrangement that couples said femoral stem to said femoral component, said locking arrangement including a locking element that passes through said opening and receives a first fastener extending from said femoral component and a second fastener extending from said stem thereby coupling said femoral stem to said femoral component.

9. The modular knee prosthesis of claim 8 wherein said first fastener is a threaded screw that threadably engages said locking element to tighten said femoral stem and said femoral component to said adapter body.