Instrumentation for the production of fixing surfaces for a knee joint endoprosthesis

• US 20010018589A1
• Filed: 02/28/2001
• Published: 08/30/2001
• Est. Priority Date: 02/29/2000
• Status: Active Grant

• Current Assignee: Peter Brehm
• Original Assignee: Peter Brehm
• Inventors: Muller, Peter
• Granted Patent: US 6,551,324 B2
• Time in Patent Office: Days
• US Class Current: 606/88
• CPC Class Codes: A61B 17/1675 for the knee
• CPC Class Codes: A61B 17/1764 for the knee
• CPC Class Codes: A61B 2017/1602 Mills

Abstract

In an instrumentation for the production of fixing surfaces for fixing a knee joint endoprosthesis to the femoral condyle that is adjacent to the knee, and to the tibial head, provision is made for a rotary milling head, which is fixable in relation to the longitudinal axis of the femur and tibia, respectively, by fastening means and which, in relation to this longitudinal axis, is angularly adjustable in a stable stop position by being pivoted, defining milling planes, and which is displaceable in the set milling plane, covering same and working as a face milling cutter or as a cylindrical milling cutter.

Claims

1. An instrumentation for the production of fixing surfaces for a knee joint endoprosthesis to be fixed to the femoral condyle that is adjacent to the knee, and to the tibial head, characterized by a rotary milling head (2) which is fixable in relation to the longitudinal axis of the femur (40) and tibia, respectively, by fastening means and which, in relation to this longitudinal axis, is angularly adjustable in a stable stop position by being pivoted, defining milling planes (cutting planes I to V), and which is displaceable in the set milling plane (cutting planes I to V), covering same and working as a face milling cutter or as a cylindrical milling cutter.

2. An instrumentation according to

claim 1

, characterized in that the fixing means comprise joined-on clamp pieces (27, 28, 29) which enclasp the respective femur (40).

3. An instrumentation according to

claim 1

, characterized in that a first clamp grips over the femur (40) from above, with the clamp (26) having joined-on clamp pieces (27, 28, 29) which are displaceable one relative to the other and fixable in a stop position.

4. An instrumentation according to

claim 1

, characterized in that at least one of fastening thorns (30) and holes into which to insert fastening screws are formed on the ends of the joined-on clamp pieces (27, 28, 29).

5. An instrumentation according to

claim 1

, characterized in that the milling head (2) is adjustable in height.

6. An instrumentation according to

claim 1

, characterized in that a setscrew (31) for a threaded spindle of a stable stop position is provided for height adjustment.

7. An instrumentation according to

claim 1

, characterized in that the milling head (2) is linearly translationally displaceable in the milling planes via guide bars (5, 11) and pivotal by a pivot axis (16) or cross support.

8. An instrumentation according to

claim 1

, characterized in that a pre-setting equipment (17, 18) is provided for setting the position of the axis of the leg.

9. An instrumentation according to

claim 1

, characterized in that a setting equipment for the length of a leg (setscrew 31) is provided.

10. An instrumentation according to

claim 1

, characterized in that a setting equipment for the size of the prosthesis is provided.

11. An instrumentation according to

claim 1

, characterized in that at least one of the setting equipments and the motions of the milling head (2) in the milling planes (I to V) are servo motor driven.

12. An instrumentation according to

claim 1

, characterized in that triggering the servo motors is computer-controlled.

13. An instrumentation according to

claim 1

, characterized in that infrared markers are provided for navigation.