Knee joint prosthesis

• US 20060142867A1
• Filed: 02/21/2006
• Published: 06/29/2006
• Est. Priority Date: 02/23/2001
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Robert G Metzger
• Inventors: Hoeppner, Jacy C., Metzger, Robert G.
• Granted Patent: US 7,445,639 B2
• Time in Patent Office: Days
• US Class Current: 623/20.150
• 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 component for a knee joint prosthesis is disclosed. The modular component includes a tray, a stem and an adapter assembly. The tray includes a support surface and downwardly extending extension having a generally circular shape. The stem includes a main body portion and an upwardly extending extension. The adapter assembly connects the tray and the stem. The adapter assembly includes a first generally cylindrical cavity receiving the downwardly extending extension of the tray and a second generally cylindrical cavity receiving the upwardly extension of the stem.

Claims

1. A modular tibial component for a knee joint prosthesis, the modular tibial component comprising:

a tray having a support surface and a first extension;

a stem having a main body portion and a second extension;

an adapter body connecting the tray and the stem and establishing a relative offset between the first extension of the tray and the second extension of the stem, the adapter body defining a first cavity to receive the first extension of the tray and a second cavity to receive the second extension of the stem, the adapter body further including a sidewall defining an opening; and

a locking mechanism for coupling the tray to the stem, the locking mechanism including a first locking element passing through the opening and coupling the tray and the stem.

2. The modular tibial component for a knee joint prosthesis of claim 1, wherein the first cavity is generally cylindrical and includes a first central axis and the second cavity is generally cylindrical and includes a second central axis, the first and second central axes being parallel to one another and spaced apart.

3. The modular tibial component for a knee joint prosthesis of claim 1, wherein the locking element rotatably receives a fastener extending through the tray.

4. The modular tibial component for a knee joint prosthesis of claim 1, wherein the locking element includes a slot for receiving a portion of the stem as the locking element is inserted through the opening.

5. The modular tibial component for a knee joint prosthesis of claim 4, wherein the portion of the stem received in the slot is integrally formed with the stem.

6. The modular tibial component for a knee joint prosthesis of claim 1, wherein the stem includes a reduced diameter portion, the locking element engaging the reduced diameter portion.

7. The modular tibial component for a knee joint prosthesis of claim 1, wherein the locking element includes an open end and a bottom surface having a slot intersecting the open end and wherein the stem includes a head received in the open end and having a diameter greater than a width of the slot.

8. The modular tibial component of claim 1,

wherein the locking mechanism includes a second locking element;

wherein the second locking element is operable to pass through at least a portion of one of the first cavity, the second cavity, or combinations thereof to engage the first locking element.

9. The modular tibial component of claim 8, wherein the first locking element is operable to interact with the second locking element to draw the tibial tray toward the second locking element.

10. The modular tibial component of claim 9, wherein the first locking element includes a first thread and the second locking element includes a second thread wherein the first thread and the second thread are operable to interact.

14. The modular component of claim 8, wherein the first portion of the cavity includes a first central axis and the second portion of the cavity includes a second central axis, the first central axis is at least one of parallel to, spaced apart from, or combinations thereof relative to the second central axis.

11. A modular component for implanting in a portion of an anatomy, comprising:

a tray having a support surface and a first extension;

a stem having a body portion and a second extension;

an adapter operable to connect the tray and the stem, the adapter defining an internal cavity having a first portion to receive the first extension and a second position to receive the second extension, a passage defined by an outer wall of the adapter; and

a locking member operable to pass through at least a portion of the passage defined by the adapter to operably interconnect the tray and the stem.

12. The modular component of claim 11, further comprising:

a second locking member operable to interconnect the tray and the locking member.

13. The modular component of claim 12, wherein the locking member threadably receives the second locking member.

15. The modular component of claim 11, wherein the outer wall is a side wall.

16. The modular component of claim 15, wherein the locking component is operable to pass through the passage substantially orthogonal to an axis of at least one of the first extension, the second extension, or combinations thereof.

17. The modular component of claim 11, wherein the joint component is a tibial tray.

19. The modular component of claim 17, further comprising:

a second locking element operable to interconnect the tray and the locking element.

20. The modular component of claim 17, wherein the joint component is a tibial tray and the stem is an intramedullary stem operable to extend form the tibial tray.

21. The modular component of claim 20, further comprising:

a femoral component comprising;

a joint component having a male extension;

a stem for engaging a canal of a bone, the stem having a main body portion and a male extension;

an adapter body for establishing a relative offset between the male extension of the joint component and the male extension of the stem, the adapter body including a first cavity receiving the male extension of the joint component and a second cavity receiving the male extension of the stem, the first cavity intersecting the second cavity; and

a locking arrangement for coupling the tray to the stem, the locking arrangement extending between the first and second cavities, the locking arrangement including a first member removably engaging the tray and a second member removably engaging the stem, the first and second members rotatably coupled to one another within the adapter body.

22. The modular component of claim 19, wherein the locking element threadably receives the second locking element extending through the joint component.

23. The modular component of claim 19, wherein second locking element is at least one of a screw, a bolt, a quick connect lock, or combinations thereof operable to extend relative to the tray, the system, or the adapter body.

18. A modular component for a joint prosthesis comprising:

a joint component;

a stem having an extension;

an adapter defining a first void extending relative to a first axis and a second void extending relative to a second axis;

wherein the first void and the second void are defined by a side wall;

a passage defined by the side wall;

a locking member operable to pass through the passage and relative to the first axis, the second axis, or combinations thereof;

wherein the locking element is operable to engage at least one of the tray, the first extension, or combinations thereof to assist in compressing the tray relative to the stem.

24. The modular component of claim 18, wherein the first axis and the second axis are spaced apart.

25. The modular component of claim 18, wherein the first axis and the second axis are spaced apart by about 0 mm to about 5 mm.

26. The modular component of claim 18, wherein the first axis and the second axis are parallel.