Patient-Specific Implants

• US 20110046735A1
• Filed: 11/03/2010
• Published: 02/24/2011
• Est. Priority Date: 02/27/2006
• Status: Abandoned Application

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Uthgenannt, Brian A., Fox, Duke A., May, Brian M., Metzger, Robert
• Application Number:
  US12/938,905
• Publication Number:
  US 20110046735A1
• Time in Patent Office: Days
• US Class Current: 623/14.12
• 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 2/3868 with sliding tibial bearing
• CPC Class Codes: A61F 2/3872 Meniscus for implantation between the natural bone surfaces
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2002/30014 differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30617 Visible markings for adjusting, locating or measuring
• CPC Class Codes: A61F 2002/4662 for measuring penetration depth
• CPC Class Codes: A61F 2002/4668 for measuring angles
• CPC Class Codes: A61F 2250/0018 differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2250/0029 differing in bending or flexure capacity
• CPC Class Codes: A61F 2250/0097 Visible markings, e.g. indicia
• CPC Class Codes: Y10T 29/49995 Shaping one-piece blank by removing material

Abstract

An endoprosthetic device includes a monolithic meniscal implant having a three-dimensional patient-specific tibial engagement surface nesting in and complementary to a proximal surface of the proximal tibia of a patient and a femoral articulating surface opposite to the tibial engagement surface for articulating with a femoral condyle of the patient. The meniscal implant includes a first portion and a second remainder portion, wherein the first portion is compressible relative to the second remainder portion.

Claims

1. An endoprosthetic device comprising:

a monolithic meniscal implant having a three dimensional patient-specific tibial engagement surface nesting in and complementary to a proximal surface of the proximal tibia of a patient, a femoral articulating surface opposite to the tibial engagement surface for articulating with a femoral condyle of the patient, the meniscal implant including a first portion and a second remainder portion, wherein the first portion is compressible relative to the second remainder portion.

2. The endoprosthetic device of claim 1, wherein the first portion includes a plurality of cutouts providing resiliency to the first portion.

3. The endoprosthetic device of claim 2, wherein the meniscal implant comprises cobalt chrome.

4. The endoprosthetic device of claim 2, wherein the cutouts are made by electrical discharge machining.

5. The endoprosthetic device of claim 4, wherein the cutouts are slits that impart about thirty percent compressibility to the meniscal implant in a superior-inferior direction.

6. The endoprosthetic device of claim 1, wherein the plurality of cutouts includes slits extending in an anterior-posterior direction.

7. The endoprosthetic device of claim 6, wherein the plurality of cutouts includes slits parallel to and under to the femoral articulating surface.

8. The endoprosthetic device of claim 6, wherein the plurality of slits extend to about one quarter of the meniscal implant in a superior to inferior direction.

9. The endoprosthetic device of claim 1, further comprising a tibial bearing having a patient specific profile.

10. The endoprosthetic device of claim 9, wherein the tibial bearing has a patient-specific articulating surface.

11. The endoprosthetic device of claim 9, further comprising a tibial tray having a patient-specific profile.

12. The endoprosthetic device of claim 11, wherein the tibial tray has a patient-specific bone engaging surface.

13. The endoprosthetic device of claim 12, further comprising a tibial stem coupled to the tibial tray, the tibial stem having a patient-specific orientation relative to the tibial tray.

14. The endoprosthetic device of claim 11, wherein the tibial tray is machined from a tray blank capable of accommodating different-size tibial trays, the tibial blank having a plurality of locking tabs engageable with corresponding grooves of the tibial bearing.

16. The endoprosthetic device of claim 13, wherein the first portion includes a plurality of cutouts providing resiliency and compressibility to the first portion.

17. The endoprosthetic device of claim 16, wherein the cut-outs are slits providing about thirty percent compressibility relative to the entire height of the meniscal implant,

15. An endoprosthetic device comprising:

a meniscal implant including a first portion and a second remainder portion, the first portion including a femoral articulating surface for articulating with a femoral condyle of the patient, the first portion being compressible relative to the second remainder portion, the second remainder portion including a patient specific tibial engagement surface, the tibial engagement surface complementary and engageable to a tibial proximal surface of the patient.

18. An endoprosthetic device comprising:

a tibial bearing having a patient specific profile;

a tibial component including a tibial tray having a patient-specific profile; and

a tibial stem having a patient-specific orientation relative to the tibial tray.

19. The endoprosthetic device of claim 18, wherein the tibial tray is machined from a tray blank capable of accommodating different-size tibial trays, the tibial blank having a plurality of locking tabs engageable with corresponding grooves of a tibial bearing.

20. The endoprosthetic device of claim 18, wherein the locking tabs are not patient-specific.

21. The endoprosthetic device of claim 18, wherein the tibial bearing has a patient-specific articulating surface.

22. A manufacturing method comprising:

machining a tibial tray having a patient-specific profile from a tibial tray blank having a greater size that the tibial tray; and

machining a customized tibial stem from a stem blank coupled to the tibial tray blank.

23. The method of claim 22, further comprising machining the tibial stem to have a patient-specific orientation relative to the tibial tray.

24. The method of claim 22, further comprising machining the tibial stem to have a patient-specific length.

25. The method of claim 22, further comprising machining the tibial stem to have a patient-specific shape.

26. The manufacturing method of claim 22, wherein machining a tibial tray having a patient-specific profile form a tibial tray blank includes incorporating a plurality of locking tabs from tibial tray blank to the tibial tray.

27. The manufacturing method of claim 26, further comprising customizing the locking tabs.