Marking template for installing a custom replacement device for resurfacing a femur and associated installation method

• US 20050119664A1
• Filed: 01/07/2005
• Published: 06/02/2005
• 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 7,517,365 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 top surface;

a bottom surface;

the bottom surface substantially formed to match a distal end of a femur; and

an opening through the top and bottom surfaces adapted to guide a drill at a predetermined location along the distal end of the femur.

2. A system for installing a replacement device to a distal end of a femur having a trochlear groove surface, comprising:

a marking template, wherein;

the marking template has a back side substantially matching the distal end of a femur; and

a hole through the marking template;

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

a replacement device, wherein;

the replacement device has a bottom side substantially matching the distal end of the femur; and

a pin protruding from the bottom side of the replacement device adapted to insert into the opening on the distal end of the femur.

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 2, further including a 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 2, 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.

6. A method of installing a replacement device to the trochlear groove of a patient'"'"'s femur, comprising the steps of:

providing a replacement device having a bottom side that substantially matches the trochlear groove of a patient'"'"'s femur, wherein the bottom side of the

replacement device has a pin at a predetermined location;

providing a marking template having a back side that substantially matches the trochlear groove of the patient'"'"'s femur, wherein the marking template has an opening corresponding to the predetermined location of the pin;

removing the cartilage from the distal end of the femur;

positioning the marking template about the femur substantially similar to the desired installed position of the replacement device;

drilling a hole on the distal end of the femur though the opening of the marking template;

removing the marking template from the femur; and

inserting the pin of the replacement device into the hole of the femur to install the replacement device on the desired location of the femur.

7. A method according to claim 6, wherein the replacement device has a plurality of pins, wherein the replacement device has a plurality of holes corresponding to the plurality of pins.

8. A method according to claim 7, further including the steps of:

bonding the replacement device to the femur by applying adhesive between the two.

9. A method according to claim 7, further including the steps of bonding the replacement device to the femur by utilizing a bone ingrowth surface.