Patient-specific hip joint devices

• US 9,662,216 B2
• Filed: 10/28/2013
• Issued: 05/30/2017
• 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: Meridew, Jason D., Hershberger, Troy W., Witt, Tyler D., White, John R., Metzger, Robert
• Primary Examiner(s): Sharma, Yashita
• Application Number:
  US14/064,970
• Publication Number:
  US 20140052270A1
• Time in Patent Office: 1,310 Days
• Field of Search: 623 2311- 2314, 623 224- 2246, 623 2211, 623 2212, 623 2215- 2218, 623 2221, 623 2223- 2225, 623 2227, 623 2231- 2238, 606 91, 606 99
• CPC Class Codes: A61B 17/151 for corrective osteotomy
• CPC Class Codes: A61B 17/152 for removing a wedge-shaped piece of bone
• CPC Class Codes: A61B 2034/105 Modelling of the patient, e.g. for ligaments or bones
• CPC Class Codes: A61B 2034/108 Computer aided selection or customisation of medical implants or cutting guides
• CPC Class Codes: A61B 2034/252 indicating steps of a surgical procedure
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61F 2/30771 applied in original prostheses, e.g. holes or grooves
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2/3603 implanted without ablation of the whole natural femoral head endoprosthetic cartilage A61F2/30756
• CPC Class Codes: A61F 2/3609 Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts A61F2/3601 takes precedence
• CPC Class Codes: A61F 2/4609 of acetabular cups
• CPC Class Codes: A61F 2002/302 toroidal, e.g. rings
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30617 Visible markings for adjusting, locating or measuring
• CPC Class Codes: A61F 2002/30736 Augments or augmentation pieces, e.g. wedges or blocks for bridging a bone defect
• CPC Class Codes: A61F 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30934 Special articulating surfaces
• CPC Class Codes: A61F 2002/30952 using CAD-CAM techniques or NC-techniques
• CPC Class Codes: A61F 2002/30962 using stereolithography
• CPC Class Codes: A61F 2002/4633 for selection of endoprosthetic joints or for pre-operative planning
• CPC Class Codes: A61F 2002/4662 : for measuring penetration depth
• CPC Class Codes: A61F 2002/4668 : for measuring angles
• CPC Class Codes: A61F 2002/4687 : Mechanical guides for implantation instruments
• CPC Class Codes: B33Y 80/00 : Products made by additive manufacturing

Abstract

An implant for a femoral head of a patient. The implant includes a shell implantable on the femoral head of the patient and correcting a defect of the femoral head. The shell is designed preoperatively to have a patient-specific first surface for articulation with the patient'"'"'s acetabulum and a patient-specific periphery mateable with a periphery of the defect. The shell caps the defect and the first surface of the shell is continuous to a remaining healthy surface of the femoral head. The defect can be a bone defect, a cartilage defect or a combination thereof.

Claims

1. An implant for a femoral head, the implant comprising:

a shell, having, a first surface configured to replace a defective area of a bone defect of a portion of an articulation surface of the femoral head, the first surface being patient-specific to the portion of the articulation surface of the femoral head and configured to conform with the patient'"'"'s acetabulum for partial articulation thereon, wherein the patient-specific first surface is a three-dimensionally curved articulation surface that is configured to replace the defective area of the femoral head with a continuation of a healthy bone surface;

a patient-specific periphery mateable with a periphery of the bone defect, such that the first surface is configured to be continuous at the periphery of the bone defect to a remaining healthy surface of the articulation surface of the femoral head and the implant is configured to replace and correct the bone defect to allow for full articulation with the patient'"'"'s acetabulum; and

a second surface opposite the first surface and configured to engage bone underlying the bone defect.

2. The implant of claim 1, further comprising a bone fixator extending from the second surface into the underlying bone.

3. The implant of claim 2, wherein the fixator is monolithically attached and integral to the implant.

4. The implant of claim 2, wherein the fixator is modularly attached to the implant.

5. The implant of claim 1, wherein the patient-specific periphery is configured to mate with a recess formed in the periphery of the bone defect.

6. The implant of claim 1, wherein the implant is shaped as a portion of a shell configured to be received in the defective area of the bone defect.

7. The implant of claim 1, wherein the second surface is configured to engage a healthy bone area exposed after the bone defect is cleaned or removed.

8. The implant of claim 1, wherein the second surface is patient-specific.

9. The implant of claim 1, wherein the second surface comprises a three-dimensionally curved surface that is configured to conform and mirror healthy bone area underlying the defect.

10. The implant of claim 2, wherein the bone fixator comprises a curved peg extending from a first end at the second surface to a narrower, second end extended away from the second surface.

11. An implant for a femoral head, the implant comprising:

a shell, having,

a first surface configured to replace a cartilage defect of a portion of an articulation surface of the femoral head, the first surface being patient-specific to the portion of the articulation surface of the femoral head and configured to conform with the patient'"'"'s acetabulum for partial articulation thereon, wherein the patient-specific first surface is a three-dimensionally curved articulation surface that is configured to replace the cartilage defect of the femoral head with a continuation of a healthy bone surface;

a patient-specific periphery mateable with a periphery of the cartilage defect, such that the first surface is configured to be continuous at the periphery of the bone defect to a remaining healthy cartilage of the articulation surface of the femoral head and the implant is configured to replace and correct the cartilage defect such that the first surface and the remaining healthy cartilage of the articulation surface allow for full articulation of the femoral head with the patient'"'"'s acetabulum; and

a second surface opposite the first surface, the second surface being patient-specific and configured to conform and engage a healthy area of the femoral head underlying the cartilage defect.

12. The implant of claim 11, wherein the implant is configured to be press-fitted into the healthy area underlying the cartilage defect.

13. The implant of claim 11, wherein the implant includes a fixation element extending from the second surface and configured to engage the healthy area of the femoral head underlying the cartilage defect.

14. The implant of claim 11, comprising pyrolytic carbon.

15. The implant of claim 11, comprising resorbable material.

16. The implant of claim 11, in combination with a cementing agent for securing the implant in the femoral head.