Implant fixation device

• US 8,968,415 B2
• Filed: 02/07/2013
• Issued: 03/03/2015
• Est. Priority Date: 02/07/2012
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Meridew, Jason D., White, John R., Bollinger, Mark A., Slone, W. Jason, Serbousek, Jon C., Bailey, Kirk J.
• Primary Examiner(s): STEWART, JASON-DENNIS NEILKEN
• Application Number:
  US13/761,345
• Publication Number:
  US 20130204387A1
• Time in Patent Office: 754 Days
• Field of Search: 623/16.11, 623/18.11, 623 224- 2338
• US Class Current: 623/22.4
• CPC Class Codes: A61F 2/30734 Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
• CPC Class Codes: A61F 2/30749 Fixation appliances for connecting prostheses to the body
• CPC Class Codes: A61F 2/34 Acetabular cups
• 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 2/367 Proximal or metaphyseal parts of shafts trochanteric devices connected to said proximal parts A61F2/30739
• CPC Class Codes: A61F 2/4609 of acetabular cups
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30378 Spherically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30565 having spring elements
• CPC Class Codes: A61F 2002/30579 with mechanically expandable devices, e.g. fixation devices
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30884 Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• CPC Class Codes: A61F 2002/3241 having a ring, e.g. for locking the femoral head into the acetabular cup
• CPC Class Codes: A61F 2002/3403 Polar aperture
• CPC Class Codes: A61F 2002/3429 with an integral peripheral collar or flange, e.g. oriented away from the shell centre line
• CPC Class Codes: A61F 2002/3631 with an integral complete or partial peripheral collar or bearing shoulder at its base
• CPC Class Codes: A61F 2002/4629 connected to the endoprosthesis or implant via a threaded connection

Abstract

Disclosed is an orthopedic implant that includes an anchor, a bore, and a compressible and expandable mesh. The anchor is configured to secure the implant at an implantation site and defines a longitudinal axis. The bore is defined by the anchor and extends along the longitudinal axis. The compressible and expandable mesh is aligned along the longitudinal axis and defines a plurality of openings. The mesh is configured to compress along the longitudinal axis and expand from the longitudinal axis to engage surrounding bone or tissue at the implantation site to secure the implant at the implantation site.

Claims

1. An orthopedic implant comprising:

a tray including a superior side and an inferior side opposite to the superior side;

a connector extending from the superior side of the tray, the connector configured to couple with a femoral head implant including an articulation surface;

an anchor extending from the inferior side of the tray and configured to secure the implant at an implantation site, the anchor defining a longitudinal axis thereof;

a bore defined by the anchor, the bore extending along the longitudinal axis; and

a compressible and expandable mesh aligned along the longitudinal axis and defining a plurality of openings, the mesh is configured to compress along the longitudinal axis and expand from the longitudinal axis to engage surrounding bone or tissue at the implantation site to secure the implant at the implantation site;

wherein the tray has a tray diameter that is greater than a diameter of each of the connector and the anchor.

2. The implant of claim 1, wherein the mesh is included in the anchor and arranged between a first solid anchor portion and a second solid anchor portion.

3. The implant of claim 1, wherein the mesh extends across substantially an entire length of the anchor along the longitudinal axis.

4. The implant of claim 1, wherein the mesh is included in an anchor cap mounted to a distal tip end of the anchor.

5. The implant of claim 1, wherein a distal tip end of the anchor includes anchor threads configured to cooperate with fastener threads of a fastener;

wherein rotation of the fastener when the fastener threads are in cooperation with the anchor threads and a head of the fastener is seated in a counterbore of the implant, compresses the anchor along the longitudinal axis, compresses the mesh along the longitudinal axis, and expands the mesh radially outward from the longitudinal axis.

6. The implant of claim 1, wherein a distal tip end of the anchor includes anchor threads configured to cooperate with tool threads of a compression tool;

wherein rotation of the compression tool when the tool threads are in cooperation with the anchor threads and a flange or the compression tool is seated in a counterbore of the implant, compresses the anchor along the longitudinal axis, compresses the mesh along the longitudinal axis, and expands the mesh radially outward from the longitudinal axis.

7. The implant of claim 1, wherein the mesh is included in an anchor cap, the anchor cap comprises an anchor head and an anchor tip;

wherein the mesh is between the anchor head and the anchor tip;

wherein the anchor head, anchor tip, and the mesh define an anchor bore;

wherein the anchor cap is configured to be mounted along the longitudinal axis to a distal tip end of the anchor through cooperation between first threads of the anchor tip and second threads of a fastener or a compression tool extending through the bore.

8. The implant of claim 1, wherein the anchor includes dampers within the bore.

9. The implant of claim 1, wherein the anchor is a stem.

10. The implant of claim 9, wherein the implant is a femoral neck implant.

11. The implant of claim 1, wherein the anchor is a sleeve.

12. The implant of claim 11, wherein the implant is a femoral long bone implant configured to be implanted in an intramedullary canal of the femur at a position that is any one of proximal to, distal to, or at an isthmus of the intramedullary canal.

13. The implant of claim 11, wherein the sleeve includes a solid portion between a first mesh portion and a second mesh portion.

14. An orthopedic implant comprising:

a plate including a first side and a second side opposite to the first side;

an anchor extending from the first side of the plate;

a connector extending from the second side of the plate, the connector configured to couple with a femoral head implant; and

a resiliently compressible mesh component included in the plate or attached to the anchor, the mesh component is configured to retain the implant at an implant site;

wherein the plate has a plate diameter that is greater than a diameter of each of the connector and the anchor.

15. The orthopedic implant of claim 14, wherein the implant is a femoral neck implant and the connector includes resilient components that apply compressive force to surrounding bone.

16. The orthopedic implant of claim 14, wherein the implant is a distal femoral implant.

17. An orthopedic implant comprising:

a base plate including a superior side and an inferior side opposite to the superior side;

a connector extending from the superior side of the base plate;

a femoral head implant including a coupling member configured to couple with the connector to secure the femoral head implant to the connector;

an anchor extending from the inferior side of the base plate along a longitudinal axis of the base plate, the anchor configured to secure the implant at an implantation site within a femur;

a bore defined by the anchor, the bore extending along the longitudinal axis; and

a compressible and expandable mesh aligned along the longitudinal axis, arranged between a first solid anchor portion and a second solid anchor portion, and defining a plurality of openings, the mesh configured to expand from the longitudinal axis to engage surrounding bone or tissue at the implantation site to secure the implant at the implantation site;

wherein the base plate has a base plate diameter that is greater than a diameter of each of the connector and the anchor.

18. The implant of claim 17, wherein a distal end of the anchor includes a coupling surface configured to cooperate with a retractor;

and

wherein when the retractor is in contact with the coupling surface, rotation of the retractor draws the distal end of the anchor towards the base plate to compress the anchor along the longitudinal axis, thereby expanding the mesh radially outward from the longitudinal axis.

19. The implant of claim 17, wherein a distal tip end of the anchor includes anchor threads configured to cooperate with fastener threads of a fastener;

and

wherein rotation of the fastener when the fastener threads are in cooperation with the anchor threads and a head of the fastener is seated in a counterbore of the base plate, compresses the anchor along the longitudinal axis, compresses the mesh along the longitudinal axis, and expands the mesh radially outward from the longitudinal axis.

20. The implant of claim 17, wherein a distal tip end of the anchor includes anchor threads configured to cooperate with tool threads of a compression tool;

wherein rotation of the compression tool when the tool threads are in cooperation with the anchor threads and a flange of the compression tool is seated in a counterbore of the implant, compresses the anchor along the longitudinal axis, compresses the mesh along the longitudinal axis, and expands the mesh radially outward from the longitudinal axis.