Patient-adapted and improved articular implants, designs and related guide tools

• US 9,320,620 B2
• Filed: 07/09/2013
• Issued: 04/26/2016
• Est. Priority Date: 02/24/2009
• Status: Active Grant

• Current Assignee: Conformis Incorporated
• Original Assignee: Conformis Incorporated
• Inventors: Bojarski, Raymond A., Chao, Nam T., Slamin, John, Lang, Philipp, Fitz, Wolfgang, Steines, Daniel
• Primary Examiner(s): Philogene, Pedro
• Application Number:
  US13/938,081
• Publication Number:
  US 20140136154A1
• Time in Patent Office: 1,022 Days
• Field of Search: 606/79, 606/86.R, 623 203- 2035, 623/20.14, 623/20.18, 623/20.21, 623/20.24, 623/22.11, 623/19.11, 623/17.11, 703/1, 703/3, 295/92
• US Class Current: 1/1
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/157 Cutting tibia
• CPC Class Codes: A61B 17/1764 for the knee
• CPC Class Codes: A61B 2034/107 Visualisation of planned trajectories or target regions
• 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 2/30942 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 2/384 hinged, i.e. with transverse axle restricting the movement
• CPC Class Codes: A61F 2/3859 Femoral components
• CPC Class Codes: A61F 2/3886 for stabilising knees against anterior or lateral dislocations
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2/5046 for designing or making customized prostheses, e.g. using templates, finite-element analysis or CAD-CAM techniques
• CPC Class Codes: A61F 2002/30324 differing in thickness
• CPC Class Codes: A61F 2002/30327 differing in diameter
• CPC Class Codes: A61F 2002/30952 using CAD-CAM techniques or NC-techniques
• CPC Class Codes: A61F 2002/3895 unicompartimental
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing

Abstract

Methods and devices are disclosed relating improved articular models, implant components, and related guide tools and procedures. In addition, methods and devices are disclosed relating articular models, implant components, and/or related guide tools and procedures that include one or more features derived from patient-data, for example, images of the patient'"'"'s joint. The data can be used to create a model for analyzing a patient'"'"'s joint and to devise and evaluate a course of corrective action. The data also can be used to create patient-adapted implant components and related tools and procedures.

Claims

1. A femoral implant for repairing a knee joint of a patient, comprising:

a bone-facing surface and

a condylar portion having a joint-facing surface, wherein the joint-facing surface has an overall shape defined by multiple radii of curvature, wherein a posterior portion of the joint-facing surface has a shape defined by decreasing radii of curvature.

2. The femoral implant of claim 1, wherein the multiple radii of curvature are in a sagittal plane.

3. The femoral implant of claim 2, wherein the joint-facing surface has a single radius in a coronal plane.

4. The femoral implant of claim 1, wherein the multiple radii of curvature are derived from a corresponding curve of a femoral condyle of the knee joint of the patient.

5. The femoral implant of claim 4, wherein the corresponding curve is a sagittal J-curve of the knee joint of the patient.

6. The femoral implant of claim 1, wherein a distal portion of the joint-facing surface has a smoothed curvature.

7. A knee replacement system including the femoral implant of claim 1, and a tibial implant, wherein the tibial implant has a tibial articulating surface having a shape matching the overall shape of the joint-facing surface of the femoral implant.

8. The knee replacement system of claim 7, wherein the joint-facing surface has a single radius in a coronal plane, and the tibial articulating surface has a matching single radius in the coronal plane.

9. The knee replacement system of claim 7, wherein the multiple radii of curvature are in a sagittal plane, and the tibial articulating surface has matching multiple radii of curvature in the sagittal plane.

10. The knee replacement system of claim 7, further including one or more surgical tools.

11. The knee replacement system of claim 10, wherein at least one of the one or more surgical tools is designed using electronic image data of the knee joint of the patient.