PATIENT-SPECIFIC GUIDE FOR PARTIAL ACETABULAR SOCKET REPLACEMENT

• US 20120078259A1
• Filed: 04/18/2011
• Published: 03/29/2012
• Est. Priority Date: 09/29/2010
• 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.
• Granted Patent: US 9,271,744 B2
• Time in Patent Office: Days
• US Class Current: 606/87
• CPC Class Codes: A61B 17/1746 for the acetabulum
• CPC Class Codes: A61B 2017/00526 Methods of manufacturing
• CPC Class Codes: A61B 2017/568 produced with shape and dimensions specific for an individual patient
• CPC Class Codes: A61B 2034/108 Computer aided selection or customisation of medical implants or cutting guides
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61F 2/30756 Cartilage endoprostheses A61F2/3603 takes precedence
• 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 2/34 Acetabular cups
• 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 2002/3487 Partial acetabular cups, e.g. strips replacing only partially the natural acetabular cartilage
• CPC Class Codes: A61F 2310/00029 Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61F 2310/00161 Carbon; Graphite
• CPC Class Codes: A61F 2310/00371 Collagen

Abstract

A device for partial acetabular replacement includes a patient-specific acetabular guide. The acetabular guide has a first surface configured to nestingly mate in only one position to the patient'"'"'s acetabulum. The acetabular guide includes a patient-specific guiding formation configured to guide a cutting tool to remove damaged tissue from a defect of the patient'"'"'s acetabulum and prepare a patient-specific implantation slot corresponding to the defect after removal of the damaged tissue. A patient-specific partial acetabular implant can be configured to nestingly mate with the patient-specific implantation slot.

Claims

1. A device for partial acetabular replacement comprising:

a patient-specific acetabular guide having a first curved three-dimensional surface configured to nestingly mate in only one position to the patient'"'"'s acetabulum including the acetabulum'"'"'s articular cartilage and acetabular fossa, the acetabular guide having a patient-specific guiding formation configured to guide a cutting tool to remove a cartilage defect of the patient'"'"'s acetabulum and prepare the acetabulum for a patient-specific partial acetabular implant.

2. The device of claim 1, wherein the guiding formation is a bore through the acetabular guide.

3. The device of claim 1, wherein the acetabular guide includes a second planar outer surface and the guiding formation is an open bore extending from the second surface and through the first surface.

4. The device of claim 1 in combination with a patient-specific partial acetabular implant configured to be received in a patient-specific implantation slot formed by removing the cartilage defect using the acetabular guide.

5. The combination of claim 4, wherein the partial acetabular implant has a three-dimensional peripheral surface configured to mate with a wall of the patient-specific implantation slot.

6. The combination of claim 5, wherein the partial acetabular implant has an outer surface configured to be continuous with a surrounding cartilage after implantation for femoral joint articulation.

7. The combination of claim 5, wherein the partial acetabular implant includes an anchoring element for engaging the acetabulum of the patient.

8. The combination of claim 4, wherein the partial implant is an allograft implant.

9. The combination of claim 4, further including an inverse acetabular guide configured during the preoperative plan of the patient for extracting the partial acetabular implant from allograft tissue.

10. The device of claim 1, wherein the patient-specific acetabular guide includes a depth control surface configured to mate with a distal portion of a handle of a cutting tool for controlling a cutting depth through the guiding formation.

11. A method for a partial socket replacement comprising:

mounting a patient-specific acetabular guide on an acetabulum of a patient, wherein the acetabular guide is configured to mate to the patient'"'"'s acetabulum in only one position;

guiding a cutting tool through a patient-specific bore of the acetabular guide, wherein the patient-specific bore of the acetabular guide is configured to overlay a defect in the acetabulum of the patient;

removing damaged tissue of the defect; and

forming a patient-specific implantation slot by removing the damaged tissue.

12. The method of claim 11, further comprising implanting a patient-specific partial acetabular implant in the patient-specific slot.

13. The method of claim 12, wherein the partial acetabular implant has a peripheral surface configured to mate with a wall of the patient-specific implantation slot.

14. The method of claim 13, wherein the partial acetabular implant has an outer surface configured to be continuous with a surrounding cartilage after implantation.

15. The method of claim 12, further comprising anchoring the patient-specific partial acetabular implant in the acetabulum using an anchoring element.

16. The method of claim 12, further comprising

engaging a patient-specific inverse acetabular guide to allograft tissue;

guiding a cutting tool along a guiding slot of the patient-specific inverse acetabular guide, the guiding slot configured during the preoperative plan to mate with a wall of the patient-specific implantation slot; and

extracting the patient-specific partial acetabular implant from the allograft tissue.

17. A device for partial acetabular replacement comprising:

a patient-specific acetabular guide having a first surface configured to nestingly mate in only one position to the patient'"'"'s acetabulum and a patient-specific guiding formation configured to guide a cutting tool to remove damaged tissue from a defect of the patient'"'"'s acetabulum and prepare a patient-specific implantation slot corresponding to the defect after removal of the damaged tissue; and

a patient-specific partial acetabular implant configured to nestingly mate with the patient-specific implantation slot.

18. The device of claim 17, wherein the first surface is a curved three-dimensional surface configured to mate with portions of an articular cartilage and an acetabular fossa of the acetabulum.

19. The device of claim 17, wherein the guiding formation is a bore through the acetabular guide.

20. The device of claim 17, wherein the acetabular guide includes a second planar outer surface and the guiding formation is an open bore extending from the second surface and through the first surface.

21. The device of claim 17, wherein the partial acetabular implant has a three-dimensional peripheral surface configured to mate with a wall of the patient-specific implantation slot.

22. The device of claim 21, wherein the partial acetabular implant has an outer surface configured to be continuous with a surrounding cartilage after implantation for femoral joint articulation.

23. The device of claim 21, wherein the wall of the patient-specific implantation slot is configured as an envelope of the defect.

24. The device of claim 20, wherein the partial acetabular implant includes an anchoring element for engaging the acetabulum of the patient.

25. The device of claim 17, further comprising an inverse acetabular guide configured during a preoperative plan of the patient for extracting the patient-specific partial acetabular implant from allograft tissue.