FEMORAL ACETABULAR IMPINGEMENT GUIDE

• US 20160038160A1
• Filed: 07/14/2015
• Published: 02/11/2016
• Est. Priority Date: 02/27/2006
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Metzger, Robert, Meridew, Jason D., Susaraba, John M.
• Granted Patent: US 10,206,695 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 17/175 for preparing the femur for hip prosthesis insertion
• CPC Class Codes: A61B 17/809 with bone-penetrating elements, e.g. blades or prongs bone staples A61B17/0642; intramedullary nails with a plate at an end A61B17/7233
• CPC Class Codes: A61B 2017/00526 Methods of manufacturing
• CPC Class Codes: A61B 2017/1602 Mills
• 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

Abstract

An orthopedic device for correcting a femoral bone abnormality includes a patient-specific three-dimensional shell and a patient-specific guiding feature. The shell has an outer surface and an inner bone engagement surface customized in a pre-operating planning stage by computer imaging to closely mate and conform to and substantially cover a femoral head of a patient in only one position. The guiding feature is pre-operatively planned relative to the shell such that when the shell is fitted over the femoral head, the guiding feature can guide a removal tool for removing an abnormality portion of the proximal femur of the patient.

Claims

1. An orthopedic device for correcting a femoral bone abnormality comprising:

a patient-specific three-dimensional shell having an outer surface and an inner bone engagement surface customized in a pre-operating planning stage by computer imaging to closely mate and conform to and substantially cover a femoral head of a patient in only one position; and

a patient-specific guiding feature pre-operatively planned relative to the shell such that when the shell is fitted over the femoral head, the guiding feature can guide a removal tool for removing an abnormality portion of the proximal femur of the patient.

2. The orthopedic device of claim 1, wherein the shell mates and conforms to at least a portion of a junction between the femoral head and femoral neck.

3. The orthopedic device of claim 1, wherein the guiding feature includes a guiding window defined by the shell, the guiding window having a patient-specific inner boundary customized during the pre-operative stage to circumscribe an outer perimeter of the abnormality portion when the shell is fitted on the femoral head of the patient and such that the abnormality portion is accessible through the window by a bone removal tool.

4. The orthopedic device of claim 3, in combination with a bone removal tool having a shaft with a distal surface and a cutting portion extending from the distal surface, the distal surface defining a depth stop for the removal tool when abutting the outer surface of the shell.

5. The orthopedic device of claim 1, wherein the guiding feature includes a customized elongated arcuate slot defined by the shell for guiding a bone removal tool.

6. The orthopedic device of claim 5, in combination with a bone removal tool having a rotatable shaft, a cutting member coupled to the shaft and a connecting member slidably coupled with the arcuate slot to guide the cutting member to remove the abnormality portion.

7. The orthopedic device of claim 6, wherein the shell includes a patient-specific distal boundary surface that can reach up to a proximal portion of a boundary of the abnormality portion under the arcuate slot.

8. The orthopedic device of claim 1, wherein the guiding feature includes a customized arcuate bracket extending from the outer surface of the shell and adjacent the abnormality portion when the shell is fitted over the femoral head.

9. The orthopedic device of claim 8, in combination with a removal tool having a rotatable shaft, a cutting member coupled to the shaft and a bushing for coupling the shaft to the arcuate bracket to guide the cutting member to remove the abnormality portion.

10. The orthopedic device of claim 9, wherein the bushing has an extension defining a groove, the groove engaging a ledge of the bracket.

11. The orthopedic device of claim 10 wherein the groove and the ledge have complementary cross-sections.

12. The orthopedic device of claim 11, wherein the complementary cross-sections are T-shaped.

13. The orthopedic device of claim 11 wherein the groove and the ledge are slidably coupled.

14. The orthopedic device of claim 13, wherein the cutting member is patient-specific and sized and shaped for removing the abnormality portion without relative sliding between the groove and the ledge.

15. An orthopedic device for correcting a femoral acetabular abnormality comprising:

a patient-specific three-dimensional shell having an outer surface and an inner bone engagement surface customized in a pre-operating planning stage by computer imaging to closely mate and conform to a femoral head of a patient in a unique position;

a customized arcuate bracket extending from the outer surface of the shell, the arcuate bracket pre-operatively planned relative to the shell such that when the shell is fitted over the femoral head, the arcuate bracket is adjacent to an abnormality portion of a proximal femur of the patient and can guide a removal tool for removing the abnormality portion; and

a removal tool having a rotatable shaft, a cutting member coupled to the shaft and a bushing for coupling the shaft to the arcuate bracket to guide the cutting member to remove the abnormality portion.

16. The orthopedic device of claim 15, wherein the shell mates and conforms to at least a portion of a junction between the femoral head and femoral neck.

17. The orthopedic device of claim 15, wherein the bushing has an extension defining a groove, the groove engaging a ledge of the arcuate bracket.

18. The orthopedic device of claim 17, wherein the groove and the ledge have complementary cross-sections.

19. The orthopedic device of claim 18, wherein the complementary cross-sections are T-shaped.

20. (canceled)

21. (canceled)

22. A method for correcting a femoral bone abnormality portion comprising:

positioning a three-dimensional shell over a femoral head of a patient, the shell having an inner bone engagement surface customized in a pre-operating planning stage by computer imaging to closely mate and conform to the femoral head and at least a portion of a junction between the femoral head and a femoral neck of the patient;

coupling a bone removal tool to a patient-specific guiding feature of the shell; and

removing an abnormality portion from a proximal femur of the patient adjacent the guiding feature of the shell with a cutting member of the removal tool.

23-27. -27. (canceled)