Patient-Specific Pelvic Implants For Acetabular Reconstruction

• US 20140088724A1
• Filed: 11/27/2013
• Published: 03/27/2014
• Est. Priority Date: 08/04/2011
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: MERIDEW, Jason
• Granted Patent: US 9,427,320 B2
• Time in Patent Office: Days
• US Class Current: 623/22.35
• 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 2/30942 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 2002/30131 horseshoe- or crescent- or C-shaped or U-shaped
• CPC Class Codes: A61F 2002/30156 triangular
• CPC Class Codes: A61F 2002/30176 V-shaped
• CPC Class Codes: A61F 2002/30281 wedge-shaped
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30576 with extending fixation tabs
• CPC Class Codes: A61F 2002/30578 having apertures, e.g. for receiving fixation screws
• CPC Class Codes: A61F 2002/30736 Augments or augmentation pieces, e.g. wedges or blocks for bridging a bone defect
• CPC Class Codes: A61F 2002/30948 using computerized tomography, i.e. CT scans
• 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: B33Y 80/00 Products made by additive manufacturing

Abstract

A pelvic implant includes a first surface including a recess configured for receiving a portion of a flange of an acetabular cage and a patient-specific second surface opposite to the first surface. The patient-specific second surface is preoperatively configured from a three-dimensional digital image of a pelvis of a patient to mate and closely conform to a corresponding surface of the pelvis under the flange in only one position.

Claims

1. A pelvic implant system comprising:

an acetabular cage implantable into a pelvis of a patient;

the acetabular cage including an acetabular cup and a plurality of flanges coupled to an upper portion of the acetabular cup; and

a plurality of spacers, wherein each spacer comprises first and second opposing surfaces, a peripheral surface located between and to space apart the first and second surfaces, wherein the first surface has a recess configured to receive a complementary-shaped portion of a corresponding flange of at least one flange of the plurality of flanges, wherein the second surface defines a patient-specific bone-engaging surface preoperatively configured to complementary mate and closely conform to a surface of the pelvis under the flange in one position,

wherein at least one flange of the plurality of flanges includes an iliac flange and at least one spacer of the plurality of spacers includes an iliac spacer couplable to said iliac flange.

2. The pelvic implant system of claim 1, wherein the peripheral surface includes a ridge surrounding the recess that is elevated relative to the first surface,

3. The pelvic implant system of claim 2, wherein the patient-specific bone-engaging surface is preoperatively configured to complementary mate and closely conform to a surface of the pelvis under the flange in only one position.

4. The pelvic implant system of claim 3, wherein the patient-specific bone-engaging surface is preoperatively configured from a three-dimensional digital image of the pelvis.

5. The pelvic implant system of claim 3, wherein at least the iliac flange includes a substantially square shape or square-like shape.

6. The pelvic implant system of claim 5, wherein the recess of the iliac spacer has an elongated rectangular shape.

7. The pelvic implant system of claim 5, wherein the recess of the iliac spacer has a square shape.

8. The pelvic implant system of claim 4, wherein another flange of the plurality of flanges is an ischial flange and the patient-specific spacer is an ischial spacer, wherein the recess of the ischial spacer has a triangular shape.

9. The pelvic implant system of claim 1, wherein at least one flange of the plurality of flanges is removably coupled to the acetabular cup.

10. The pelvic implant system of claim 9, wherein the at least one flange of the plurality of flanges that is removably coupled to the acetabular cup is an ischial blade modularly coupled to the acetabular cup.

11. The pelvic implant system of claim 1, further comprising:

an obturator foramen hook modularly coupled to the acetabular cup.

12. The pelvic implant system of claim 1, wherein the iliac spacer includes a plurality of iliac spacers, wherein each iliac spacer of the plurality of iliac spacers includes a height different from the other iliac spacers such that the plurality of iliac spacers has a variable height.

13. A pelvic implant system comprising:

a patient-specific spacer having a first surface with a recess configured for receiving at least a portion of a flange of an acetabular cage, wherein the acetabular cage is configured to be placed in an acetabular socket of a pelvis; and

wherein the patient-specific spacer has a patient-specific second surface opposite to and spaced apart from the first surface, the patient-specific second surface preoperatively configured from a three-dimensional digital image of the pelvis to mate and closely conform to a surface of the pelvis under the flange in only one position on the pelvis.

14. The pelvic implant system of claim 13, wherein the patient-specific spacer includes a plurality of patient specific spacers, wherein each of the patient-specific spacers includes a peripheral surface has a height;

wherein the height of each patient-specific spacer is different from each of the other patient-specific spacers, such that the plurality of patient-specific spacers has a variable height.

15. The pelvic implant system of claim 13, wherein the recess is at least one of triangle-shaped, elongated rectangle-shaped, substantially square-shaped, or square-shaped.

16. The pelvic implant system of claim 15, wherein the recess is configured for at least one of an ischial flange or an iliac flange.

17. A pelvic implant system comprising:

an acetabular cage implantable into a pelvis of a patient;

the acetabular cage including an acetabular cup and a plurality of flanges coupled to the acetabular cup; and

a plurality of patient-specific spacers, wherein each spacer has an elevated ridge that are least partially surrounds a recess surface that is recessed relative to an upper edge of the elevated ridge for receiving a portion of one corresponding flange of the plurality of flanges, wherein each patient specific spacer further has a patient-specific surface that is designed and preoperatively configured based on a three-dimensional digital image of at least a portion of the pelvis of the patient to mate and closely conform to a corresponding surface of the pelvis under one flange of the plurality of flanges in only one position;

wherein at least one flange of the plurality of flanges, at least one spacer of the plurality of spacers, or a combination thereof is designed and preoperatively configured based on the of the three-dimensional digital image of at least the portion of the pelvis of the patient to mate and closely conform to the corresponding surface of the pelvis under the flange in only one position.

18. The pelvic implant system of claim 17, wherein at least one flange of the plurality of flange is a patient-specific flange modularly coupled to the acetabular cup and having a patient-specific surface preoperatively configured from a three-dimensional digital image of the pelvis of the patient to mate and closely conform as a negative to a corresponding surface of the pelvis under the flange in only one position.

19. The pelvic implant system of claim 17, wherein at least one flange is removably coupled to the acetabular cup.

20. The pelvic implant system of claim 17, wherein the plurality of flanges includes an iliac flange and an ischial flange;

wherein the plurality of patient-specific spacers includes an iliac spacer and an ischial spacer.

21. The pelvic implant system of claim 17, wherein each patient-specific spacer of the plurality of patient-specific spacers includes a differently shaped perimeter.

22. The pelvic implant system of claim 17, wherein each patient-specific spacer of the plurality of patient-specific spacers includes a different height.