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

Patent metadata

Field	Value
Publication number	US-9320620-B2
Application number	US-201313938081-A
Country	US
Kind code	B2
Filing date	Jul 9, 2013
Priority date	Feb 24, 2009
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

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.

First claim

What is claimed is:

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.

Assignees

• Conformis Inc

Inventors

• Bojarski Raymond A
• Chao Nam T
• Slamin John
• Lang Philipp
• Fitz Wolfgang
• Steines Daniel

Classifications

• A61F2002/30327

  differing in diameter · CPC title

• A61F2/3886

  for stabilising knees against anterior or lateral dislocations · CPC title

• A61F2/5046 Primary

  for designing or making customized prostheses, e.g. using templates, finite-element analysis or CAD-CAM techniques · CPC title

• A61F2/389 Primary

  Tibial components (A61F2/3868 takes precedence) · CPC title

• A61B17/1764

  for the knee · CPC title