Compliant fixation for pelvis

• US 7,476,254 B2
• Filed: 01/05/2006
• Issued: 01/13/2009
• Est. Priority Date: 11/01/1993
• Status: Expired due to Fees

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: White, John R, Brown, David R
• Primary Examiner(s): Snow; Bruce E
• Application Number:
  US11/326,561
• Publication Number:
  US 20060116775A1
• Time in Patent Office: 1,104 Days
• Field of Search: 623 2221- 224, 623/23.21, 623/23.22, 623/23.24, 623/23.25, 623/23.26, 623/23.35, 623/22.15
• US Class Current: 623/22.32
• CPC Class Codes: A61B 17/68 Internal fixation devices , including fasteners and spinal fixators, even if a part thereof projects from the skin bone staples A61B17/0642
• CPC Class Codes: A61B 17/8066 for pelvic reconstruction
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/30721 Accessories
• CPC Class Codes: A61F 2/30749 Fixation appliances for connecting prostheses to the body
• CPC Class Codes: A61F 2/30942 for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
• 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 2/3662 Femoral shafts
• CPC Class Codes: A61F 2002/30329 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• 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 2002/30372 with additional means for limiting said translation
• 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 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30525 Worm gears
• CPC Class Codes: A61F 2002/30538 for adjusting angular orientation
• CPC Class Codes: A61F 2002/3055 : for adjusting length
• CPC Class Codes: A61F 2002/30566 : Helical springs
• 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 2002/3069 : Revision endoprostheses
• CPC Class Codes: A61F 2002/30787 : inclined obliquely with respect to each other
• 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 2002/3611 : Heads or epiphyseal parts of femur
• 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 2250/0006 : for adjusting angular orientation

Abstract

A pelvic implant assembly and associated methods. The implant assembly includes an acetabular component, and a compliant fixator coupling the acetabular component to the pelvis.

Claims

1. A pelvic implant assembly comprising:

an acetabular cup at least partially attachable to an acetabulum of the pelvis;

an acetabular bearing coupled to an inner surface of the acetabular cup; and

a compliant fixator implantable into the pelvis, the compliant fixator coupled to an outer surface of the acetabular cup, the compliant fixator including;

a sleeve;

a biasing element received and contained within the sleeve; and

a biasing mechanism operable to expand and contract the biasing element and provide a dynamic load to the pelvis, wherein the biasing element includes a plurality of Belleville washers, and the biasing mechanism includes a nut threadable on a portion of a traction rod axially passing through the sleeve and engageable to the pelvis;

a connector coupling the compliant fixator and the acetabular cup; and

a plate coupled to the connector.

2. The pelvic implant assembly of claim 1, further comprising a curved surface coupling the connector and the compliant fixator.

3. The pelvic implant assembly of claim 1, further comprising a conical surface coupling the connector and the compliant fixator.

4. The pelvic implant assembly of claim 1, further comprising a prosthetic femoral head articulating with the acetabular bearing.

5. The pelvic implant assembly of claim 4, further comprising a prosthetic femoral stem coupled to the femoral head.

6. The pelvic implant assembly of claim 1, further comprising a pubic implant for coupling the acetabular cup to an opposing pubic bone.

7. The pelvic implant assembly of claim 6, wherein the pubic implant comprises a clamping device for clamping a portion of the pubic bone.

8. A pelvic implant assembly comprising:

an acetabular cup at least partially attachable to an acetabulum of the pelvis;

an acetabular bearing coupled to an inner surface of the acetabular cup;

a compliant fixator implantable into the pelvis, the compliant fixator coupled to an outer surface of the acetabular cup, the compliant fixator including;

a sleeve;

a biasing element received and contained within the sleeve; and

a biasing mechanism operable to expand and contract the biasing element and provide a dynamic load to the pelvis, wherein the biasing element is a helical spring, and the biasing mechanism includes a nut threadable on a portion of a traction rod axially passing through the sleeve and engageable to the pelvis;

a connector coupling the compliant fixator and the acetabular cup; and

a plate coupled to the connector.

9. The pelvic implant assembly of claim 8, further comprising at least one bone fixator for coupling the connector to the pelvis.

10. The pelvic implant assembly of claim 8, further comprising a prosthetic femoral head articulating with the acetabular bearing.

11. A pelvic implant assembly comprising:

an acetabular cup having an outer bone-engaging surface and an inner bearing-engaging surface, the outer surface at least partially attachable to an acetabulum of the pelvis;

an acetabular bearing coupled to the inner surface of the acetabular cup;

a prosthetic femoral head articulating with the acetabular bearing;

a prosthetic femoral stem coupled to the prosthetic femoral head; and

a compliant fixator implantable into the pelvis and providing dynamic load to the pelvis, the compliant fixator including;

a sleeve;

a traction rod axially passing through the sleeve and engageable to the pelvis;

a helical spring coupled to the traction rod and received and contained within the sleeve; and

a nut threadably movable on a portion of the traction rod for compressing the helical spring;

a connector coupling the compliant fixator to an outer surface of the acetabular cup; and

a plate coupled to the connector.