Method and apparatus for aligning a taper lock connection

• US 20070203583A1
• Filed: 02/28/2006
• Published: 08/30/2007
• Est. Priority Date: 02/28/2006
• Status: Abandoned Application

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Slone, W. Jason
• Application Number:
  US11/365,895
• Publication Number:
  US 20070203583A1
• Time in Patent Office: Days
• US Class Current: 623/22.280
• CPC Class Codes: A61B 17/1666 for the acetabulum
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61B 17/8875 Screwdrivers, spanners or wrenches
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2/32 for the hip
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2/36 Femoral heads ; Femoral endoprostheses
• CPC Class Codes: A61F 2002/30113 circular
• CPC Class Codes: A61F 2002/30125 elliptical or oval
• CPC Class Codes: A61F 2002/30153 rectangular
• CPC Class Codes: A61F 2002/30156 triangular
• CPC Class Codes: A61F 2002/30171 rosette- or star-shaped
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30354 Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
• CPC Class Codes: A61F 2002/30355 Cylinder of elliptical or oval basis
• CPC Class Codes: A61F 2002/30367 with additional means for preventing said rotation
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/3079 Stepped or enlarged apertures, e.g. having discrete diameter changes
• CPC Class Codes: A61F 2002/3401 : with radial apertures, e.g. radial bores for receiving fixation screws
• CPC Class Codes: A61F 2002/3403 : Polar aperture
• CPC Class Codes: A61F 2002/3414 : Polar protrusion, e.g. for centering two concentric shells
• CPC Class Codes: A61F 2002/3611 : Heads or epiphyseal parts of femur
• CPC Class Codes: A61F 2002/4635 : using minimally invasive surgery
• CPC Class Codes: A61F 2002/4696 : optical
• 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 2230/0006 : circular
• CPC Class Codes: A61F 2230/0008 : elliptical or oval
• CPC Class Codes: A61F 2230/0019 : rectangular
• CPC Class Codes: A61F 2230/0023 : triangular
• CPC Class Codes: A61F 2230/005 : Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2310/00017 : Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00029 : Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61F 2310/00167 : Diamond or diamond-like carbon
• CPC Class Codes: A61F 2310/00179 : Ceramics or ceramic-like structures
• CPC Class Codes: A61F 2310/00395 : Coating or prosthesis-covering structure made of metals or of alloys
• CPC Class Codes: A61F 2310/00796 : Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

Abstract

A prosthesis for replacing a portion of the anatomy. The prosthesis can include a first body extending between a first region and a second region. The first body can define a first alignment portion near the first region and a first taper near the second region. The prosthesis can also comprise a second body extending between a third region and a fourth region. The second body can define a second alignment portion near the third region and a second taper near the fourth region. The first alignment portion can interact with the second alignment portion, and the first taper and the second taper can interact when the first alignment portion and second alignment portion interact.

Claims

1. A prosthesis for replacing a portion of the anatomy comprising:

a first body extending between a first region and a second region defining a first alignment portion near the first region and a first taper near the second region; and

a second body extending between a third region and a fourth region defining a second alignment portion near the third region and a second taper near the fourth region,

wherein the first alignment portion can interact with the second alignment portion; and

wherein the first taper and the second taper can interact when the first alignment portion and second alignment portion interact.

2. The prosthesis of claim 1, wherein the first region and the second region are a distance apart.

3. The prosthesis of claim 1, wherein the first body defines a cavity, the cavity further comprising:

a first surface defining the first alignment portion and the first taper; and

a second surface configured to couple the first body to the anatomy,

wherein the first alignment portion includes at least one recess.

4. The prosthesis of claim 3, wherein the second body defines a cavity, the cavity further comprising:

a first surface defining the second alignment portion and the second taper; and

a second surface configured to engage a second portion of the anatomy,

wherein the first surface is adapted to slideably engage the first surface of the first body until the first taper interacts with the second taper; and

wherein the second alignment portion includes at least one projection.

5. The prosthesis of claim 4, wherein the at least one projection and the at least one recess are cylindrical.

6. The prosthesis of claim 5, wherein the at least one projection is formed at a dome of the second body and the at least one recess is formed at a dome of the first body to prevent the first taper from interacting with the second taper until the at least one projection and at least one recess interact.

7. The prosthesis of claim 6, wherein the at least one projection and at least one recess axially align the second body within the first body.

8. The prosthesis of claim 4, wherein the first taper is formed near a rim of the first body on the first surface and the second taper is formed near a rim of the second body on the first surface.

9. The prosthesis of claim 1, wherein the first body is an acetabular shell and is composed of at least one material comprising:

titanium, titanium alloy, stainless steel, cobalt-chromium-molybedenum alloy or combinations thereof.

10. The prosthesis of claim 1, wherein the second body is a bearing liner and is composed of at least one bio-compatible material comprising:

metal, metal alloys, ceramic, ceramic diamond compact, polycrystalline diamond compact, ultra high molecular weight polyethylene or combinations thereof.

11. The prosthesis of claim 1, wherein the second body is adapted to be coupled to a natural or prosthetic femoral head.

12. An acetabular prosthesis for placement in an anatomy comprising:

an acetabular shell defining a first alignment portion and a first taper; and

a liner defining a second alignment portion and a second taper,

wherein the first alignment portion can interact with the second alignment portion; and

wherein the first taper and the second taper can interact when the first alignment portion and second alignment portion interact.

13. The acetabular prosthesis of claim 12, wherein the interaction of the first taper and second taper form a taper lock.

14. The acetabular prosthesis of claim 12, wherein the first alignment portion and first taper are formed on an inner surface of the acetabular shell.

15. The acetabular prosthesis of claim 14, wherein the first alignment portion is formed at a dome of the acetabular shell and first taper is formed at a rim of the acetabular shell and the first alignment portion includes at least one recess.

16. The acetabular prosthesis of claim 12, wherein the second alignment portion and second taper are formed on an exterior surface of the liner.

17. The acetabular prosthesis of claim 12, wherein the second alignment portion is formed at a dome of the liner and second taper is formed at a rim of the liner and the second alignment portion includes at least one projection.

18. The acetabular prosthesis of claim 12, wherein the acetabular shell is composed of a material selected from the group comprising:

metal, metal alloy, ceramic, polymers.

19. The acetabular prosthesis of claim 12, wherein the liner is composed of a bio-compatible material selected from the group comprising:

metal, metal alloy, ceramic, polymers.

20. A method for replacing a portion of the anatomy comprising:

preparing a surface of the anatomy;

providing a first body extending between a first region and a second region defining a first alignment portion near the first region and a first taper near the second region;

providing a second body extending between a third region and a fourth region defining a second alignment portion near the third region and a second taper near the fourth region;

inserting the first body into the anatomy;

inserting the second body into the anatomy;

aligning the first alignment portion with the second alignment portion; and

locking the second body within the first body by enabling the first taper to interact with the second taper.

21. The method of claim 20, wherein aligning the first alignment portion with the second alignment portion further comprises:

aligning the second body within the first body to engage the second alignment portion with the first alignment portion to axially align the second body within the first body,

wherein the alignment of the second body within the first body enables the first taper to interact with the second taper to lock the first body to the second body.