MARKING TEMPLATE FOR INSTALLING A CUSTOM REPLACEMENT DEVICE FOR RESURFACING A FEMUR AND ASSOCIATED INSTALLATION METHOD

• US 20080215059A1
• Filed: 05/14/2008
• Published: 09/04/2008
• Est. Priority Date: 03/17/2000
• Status: Active Grant

• Current Assignee: Kinamed Inc (VME Acquisition Corp)
• Original Assignee: Kinamed Inc (VME Acquisition Corp)
• Inventors: Carignan, Roger, Pratt, Clyde R.
• Granted Patent: US 7,935,150 B2
• Time in Patent Office: Days
• US Class Current: 606/96
• CPC Class Codes: A61B 17/00491 Surgical glue applicators surgical adhesives A61L24/00; two-component delivery syringes A61M5/19
• CPC Class Codes: A61B 17/1764 for the knee
• 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 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• 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 2/3859 Femoral components
• CPC Class Codes: A61F 2/3877 Patellae or trochleae
• CPC Class Codes: A61F 2/461 of knees
• CPC Class Codes: A61F 2/4657 Measuring instruments used for implanting artificial joints for surgical instruments A61B90/06
• CPC Class Codes: A61F 2002/30125 elliptical or oval
• CPC Class Codes: A61F 2002/30594 slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
• CPC Class Codes: A61F 2002/30685 Means for reducing or preventing the generation of wear particulates
• CPC Class Codes: A61F 2002/30892 parallel
• CPC Class Codes: A61F 2002/30948 using computerized tomography, i.e. CT scans
• CPC Class Codes: A61F 2002/30952 using CAD-CAM techniques or NC-techniques
• CPC Class Codes: A61F 2002/30957 using a positive or a negative model, e.g. moulds
• CPC Class Codes: A61F 2002/4658 for measuring dimensions, e.g. length
• CPC Class Codes: A61F 2230/0008 elliptical or oval
• CPC Class Codes: A61F 2310/00017 Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00029 : Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61F 2310/00203 : containing alumina or aluminium oxide
• CPC Class Codes: A61F 2310/00239 : containing zirconia or zirconium oxide ZrO2
• CPC Class Codes: A61F 2310/00407 : Coating made of titanium or of Ti-based alloys
• CPC Class Codes: A61F 2310/00796 : Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite
• CPC Class Codes: Y10S 623/901 : Method of manufacturing prosthetic device
• CPC Class Codes: Y10T 29/49764 : with testing or indicating

Abstract

A replacement device for resurfacing a joint surface of a femur and a method of making and installing such a device is provided. The custom replacement device is designed to substantially fit the trochlear groove surface, of an individual femur. Thereby creating a “customized” replacement device for that individual femur and maintaining the original kinematics of the joint. The replacement device may be defined by four boundary points, and a first and a second surface. The first of four points is 3 to 5 mm from the point of attachment of the anterior cruciate ligament to the femur. The second point is near the bottom edge of the end of the natural articulatar cartilage. The third point is at the top ridge of the right condyle and the fourth point at the top ridge of the left condyle of the femur. The top surface is designed so as to maintain centrally directed tracking of the patella perpendicular to the plane established by the distal end of the femoral condyles and aligned with the center of the femoral head.

Claims

1. A marking template for assisting drilling holes into a femur of a patient, comprising a solid body having:

a top surface;

a bottom surface;

the bottom surface having a shape custom formed to substantially match and fit a non-resected natural contour of a trochlear groove surface of a patella articulating surface of an individual patient'"'"'s femur;

the body having an opening through the top and bottom surfaces adapted to guide a drill through the body at a predetermined location along the distal end of the femur where the bottom surface is positioned in complementary relation against the distal end of the patient'"'"'s femur.

2. A system for installing a custom-made replacement device to a distal end of an individual patient'"'"'s femur, the system comprising:

a marking template having a top surface and a bottom surface, the bottom surface having a shape custom formed to substantially match and fit a non-resected natural contour of a trochlear groove surface of a patella articulating surface of the individual patient'"'"'s femur, the marking template having an opening through the top and bottom surfaces adapted to guide a drill through the marking template at a predetermined location along the distal end of the femur where the bottom surface is positioned in complementary relation against the distal end of the patient'"'"'s femur;

a drilling apparatus to form an opening on the distal end of the femur guided by the hole in the marking template; and

a custom-made replacement device, wherein the custom-made replacement device has a bottom surface having a shape custom formed to substantially match and fit a non-resected the natural contour of the distal end of the patient'"'"'s femur, and a pin protruding from the bottom surface of the custom-made replacement device adapted to be inserted into the opening on the distal end of the patient'"'"'s femur formed by the drilling apparatus.

3. A system according to claim 2, wherein the replacement device has a top side substantially tracking a trochlear groove of the femur.

4. A system according to claim 3, further including bone cement between the replacement device and the femur to bond the replacement device to the distal end of the femur.

5. A system according to claim 4, further including a bone ingrowth surface between the replacement device and the femur to bond the replacement device to the distal end of the femur.