Method and apparatus for segmental bone replacement

• US 6,508,841 B2
• Filed: 02/02/2001
• Issued: 01/21/2003
• Est. Priority Date: 11/01/1993
• Status: Expired due to Fees

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Martin, Daniel L., White, John Robert
• Primary Examiner(s): SNOW, BRUCE EDWARD
• Application Number:
  US09/776,584
• Publication Number:
  US 20010007957A1
• Time in Patent Office: 718 Days
• Field of Search: 623/23.17, 623/23.25, 623/23.26, 623/23.33, 623/23.35, 623/23.41, 623/23.12, 623/23.13, 623/23.14
• US Class Current: 623/23.12
• CPC Class Codes: A61B 17/164 intramedullary
• CPC Class Codes: A61B 17/1668 for the upper femur A61B17/164 takes precedence
• CPC Class Codes: A61B 17/1717 for applying intramedullary nails or pins
• CPC Class Codes: A61B 17/1725 for applying transverse screws or pins through intramedullary nails or pins
• CPC Class Codes: A61B 17/72 Intramedullary pins, nails or other devices A61B17/744 takes precedence
• CPC Class Codes: A61B 17/7233 with special means of locking the nail to the bone
• CPC Class Codes: A61B 2017/1602 Mills
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/3601 for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices non-prosthetic internal fixation devices for the femoral head or neck A61B17/74
• CPC Class Codes: A61F 2/3607 including proximal or total replacement of the femur
• CPC Class Codes: A61F 2002/30535 Special structural features of bone or joint prostheses not otherwise provided for
• CPC Class Codes: A61F 2250/0058 Additional features; Implant or prostheses properties not otherwise provided for

Abstract

A bone attachment assembly for a remaining portion of a long bone diaphysis following resection is provided. The assembly includes a main body, means for anchoring the device with respect to the remaining bone portion, such as an anchor body, and means for attaching the main body to the means for anchoring. The means for attaching the main body may preferably be in the form of one or more washer springs retained upon a connecting rod attached to the means for anchoring. The assembly may be connected to an orthopedic appliance, an interposed orthopedic appliance connected to a second bone attachment assembly, or a transcutaneous bar for attaching an external appliance. A reaming device for creating an intramedullary cavity, a guide device for guiding an aperture-forming procedure in a remaining bone portion, and a milling device for shaping an interface surface of the bone in a preselected geometry are also provided. In the method of the present invention, a cavity is created within a remaining bone portion using the reaming device. At least one aperture is created using the guide device, and the bone surface is milled to a preselected geometry using the milling device. The above components are then assembled together within the cavity to form the device of the present invention. The device may then be connected to other devices as stated above. A bone attachment assembly may also be provided having a compliant section integrally disposed that is operable for being converted to a preselected condition of expansion prior to or following implantation.

Claims

1. A hip attachment assembly for attaching within a cavity formed in a femur, said hip attachment assembly comprising:

a main body having an articular portion and an interface surface operable to engage a surface of the femur, said articular portion has a generally convex cross-section with said interface surface being complimentary shaped, whereby said interface surface is operable to be applied directly upon a surface of a proximal femoral head that has been shaped to a generally convex configuration;

an anchor operable to be fully retained within the cavity formed in the femur to anchor said hip attachment assembly to the femur, said anchor including an attachment mechanism located within the cavity and operable to fixedly attach said anchor within the cavity formed within the femur;

a sleeve defining a recess;

complaint portion operable to be expanded and contracted, said compliant portion disposed and contained within said recess of said sleeve and operatively associated with said main body and said anchor; and

a mating member operable to be slidably engaged with said sleeve to substantially inhibit non-axial deflection of said compliant portion.

2. The hip attachment assembly as defined in claim 1 wherein said sleeve is integrally formed with said main body.

3. The hip attachment assembly as defined in claim 2 wherein said sleeve extends from said interface surface of said main body.

4. The hip attachment assembly as defined in claim 3 wherein said sleeve is substantially cylindrically shaped to define a substantially cylindrical recess.

5. The hip attachment assembly as defined in claim 1 wherein said mating member is integral with said anchor.

6. The hip attachment assembly as defined in claim 5 wherein said mating member defines a stepped shoulder on said anchor.

7. The hip attachment assembly as defined in claim 1 wherein said mating portion is spherically shaped.

8. The hip attachment assembly as defined in claim 1 wherein said attachment mechanism is operable to anchor said hip attachment assembly to the femur by use of at least one cross pin passing through said anchor.

9. The hip attachment as defined in claim 1 wherein said compliant portion is integral with said anchor.

10. The hip attachment assembly as defined in claim 9 wherein said compliant portion is shaped as a helical spring.

11. The hip attachment assembly as defined in claim 9 further comprising a connection rod extending from said compliant portion operable for engaging said main body.

12. The hip attachment assembly as defined in claim 1 further comprising a traction rod operable to adjust a force applied to said compliant portion.

13. A hip attachment assembly for attaching within a cavity formed in a femur, said hip attachment assembly comprising:

a main body having a convex articular portion and a substantially concave interface surface operable to engage a surface of a proximal femoral head that has been shaped to a generally convex configuration, said main body further having a sleeve extending from said interface surface, said main body being formed from a single member;

an anchor operable to be fully retained within the cavity formed in the femur to anchor said hip attachment assembly to the femur, said anchor including a mating member operable to be slidably engaged with said sleeve and an attachment mechanism located within the cavity and operable to fixedly attach said anchor within the cavity formed within the femur; and

a compliant portion operable to be expanded and contracted, said compliant portion disposed and contained within said sleeve and operatively associated with said main body and said anchor, wherein upon slidably engaging said sleeve with said mating member, said sleeve substantially inhibits non-axial deflection of said compliant portion.

14. The hip attachment assembly as defined in claim 13 wherein said sleeve is substantially cylindrically shaped and defines a substantially cylindrical recess.

15. The hip attachment assembly as defined in claim 13 wherein said mating member is integral with said anchor and defines a stepped shoulder about said anchor.

16. The hip attachment assembly as defined in claim 13 wherein said attachment mechanism is operable to anchor said hip attachment assembly to the femur by use of at least one cross pin passing through said anchor.

17. A hip attachment assembly for attaching within a cavity formed in a femur, said hip attachment assembly comprising:

a main body having a convex articular portion and a substantially concave interface surface operable to engage a surface of a proximal femoral head that has been shaped to a generally convex configuration, said main body further having a sleeve extending from said interface surface;

an anchor operable to be fully retained within the cavity formed in the femur to anchor said hip attachment assembly to the femur, said anchor including a mating member operable to be slidably engaged with said sleeve and an attachment mechanism located within the cavity and operable to fixedly attach said anchor within the cavity formed within the femur; and

a compliant portion operable to be expanded and contracted, said compliant portion disposed and contained within said sleeve and operatively associated with said main body and said anchor, wherein upon slidably engaging said mating member with said sleeve, said sleeve substantially inhibits non-axial deflection of said compliant portion.

18. The hip attachment assembly as defined in claim 17 wherein said compliant portion is integral with said anchor.

19. The hip attachment assembly as defined in claim 18 wherein said compliant portion is shaped as a helical spring.