Deformable articulating templates

Patent metadata

Field	Value
Publication number	US-9675461-B2
Application number	US-201514640082-A
Country	US
Kind code	B2
Filing date	Mar 6, 2015
Priority date	Feb 25, 2009
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A method of designing a prosthetic implant. Exemplary methods may include developing a three-dimensional model of an anatomic feature from one or more two-dimensional images. The three-dimensional model may include a plurality of radii of curvature representing the shape of respective portions of a contact surface. In some exemplary embodiments, three-dimensional models associated with a large number members of a population may be utilized to create templates for prosthetic implants. A three-dimensional model of an anatomic feature of a patient may be compared to the available templates, and a suitable template may be tested by virtually implanting the template on the three-dimensional model of the patient's anatomical feature. In some embodiments, a patient's three-dimensional model for which a suitable pre-made template is not available may be used to customize a pre-made template to design a suitable implant.

First claim

What is claimed is:

1. A prosthetic implant comprising:
a human joint component implant unique to a patient to replace a natural anatomical portion of the patient, the human joint component implant imitating size and curvature features of the natural anatomical portion;
wherein the human joint component implant incorporates a camming surface fabricated by associating a plurality of radii of curvature approximating a plurality of radii of curvature of the natural anatomical portion.

2. The prosthetic implant of claim 1 , wherein:
the human joint component is a femoral component of a knee joint;
the femoral component includes a medial condyle having the camming surface; and
the camming surface includes an anterior-to-distal-to-posterior surface incorporating at least three radii of curvature obliquely angled to a medial-lateral direction of the femoral component.

3. The prosthetic implant of claim 1 , wherein:
the human joint component is a femoral component of a knee joint;
the femoral component includes a lateral condyle having the camming surface; and
the camming surface includes an anterior-to-distal-to-posterior surface incorporating at least three radii or curvature obliquely angled to a medial-lateral direction of the femoral component.

4. The prosthetic implant of claim 1 , wherein:
the human joint component is a femoral component of a knee joint;
the femoral component includes a lateral condyle and a medial condyle, where each condyle includes its own camming surface;
the camming surface for the lateral condyle includes an anterior-to-distal-to-posterior surface incorporating at least three radii of curvature obliquely angled to a medial-lateral direction of the femoral component; and
the camming surface for the medial condyle includes an anterior-to-distal-to-posterior surface incorporating at least three radii of curvature obliquely angled to the medial-lateral direction of the femoral component;
wherein the at least three radii of curvature for the lateral condyle arc not identical to the at least three radii of curvature fur the medial condyle.

5. The prosthetic implant of claim 4 , wherein:
the femoral component includes a trochlear groove surface; and
the trochlear groove surface includes an anterior-to-distal surface incorporating at least two radii of curvature obtusely angled to a medial-lateral direction of the femoral component.

6. The prosthetic implant of claim 4 , wherein:
the femoral component includes a trochlear groove surface; and
the trochlear groove surface includes a medial-to-lateral surface incorporating at least two radii of curvature parallel to a medial-lateral direction of the femoral component.

7. The prosthetic implant of claim 1 , wherein:
the human joint component is a femoral component of a knee joint;
the femoral component includes a medial condyle having the camming surface; and
the camming surface includes a medial-to-lateral surface incorporating at least three radii of curvature generally parallel to a medial-lateral direction of the femoral component.

8. The prosthetic implant of claim 1 , wherein:
the human joint component is a femoral component of a knee joint;
the femoral component includes a lateral condyle having the camming surface; and
the camming surface includes a medial-to-lateral surface incorporating at least three radii of curvature generally parallel to a medial-lateral direction of the femoral component.

9. The prosthetic implant of claim 1 , wherein:
the human joint component is a femoral component of a knee joint;
the: femoral component includes a lateral condyle and a medial condyle, where each condyle includes its own camming surface;
the camming surface for the lateral condyle includes a medial-to-lateral surface incorporating at least three radii of curvature generally parallel to a medial-lateral direction of the femoral component; and
the camming surface for the medial condyle includes a medial-to-lateral surface incorporating at least three radii of curvature generally parallel to a medial-lateral direction of the femoral component;
wherein the at least three radii of curvature for the lateral condyle are not identical to the at least three radii of curvature for the medial condyle.

10. The prosthetic implant of claim 1 , wherein:
the human joint component is a femoral component of a knee joint;
the femoral component includes a trochlear groove surface; and
the trochlear groove surface includes an anterior-to-distal surface incorporating at least two radii of curvature obtusely angled to a medial-lateral direction of the femoral component.

11. The prosthetic implant of claim 1 , wherein:
the human joint component is a femoral component of a knee joint;
the femoral component includes a trochlear groove surface: and
the trochlear groove surface includes a medial-to-lateral surface incorporating at least two radii of curvature parallel to a medial-lateral direction of the femoral component.

12. The prosthetic implant of claim 1 , wherein:
the human joint component is a femoral component of a knee joint; and
the camming surface is a shell of a femur formed by generating profiles/points by sweeping the human joint component every ten degrees, generating a curve from the profiles/points, and matching at least four of the radii of curvature to the curve.

Assignees

• Zimmer Inc
• Zimmer Inc

Inventors

• Mahfouz Mohamed Rashwan

Classifications

• A61F2/30942 Primary

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

• G16Z99/00 Primary

  Subject matter not provided for in other main groups of this subclass · CPC title

• A61B2034/102

  Modelling of surgical devices, implants or prosthesis · CPC title

• A61F2/38

  for elbows or knees · CPC title

• A61F2/3601

  for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices (non-prosthetic internal fixation devices for the femoral head or neck A61B17/74) · CPC title