Milling system and methods for resecting a joint articulation surface

• US 20060276796A1
• Filed: 05/26/2005
• Published: 12/07/2006
• Est. Priority Date: 05/26/2005
• Status: Active Grant

• Current Assignee: Medicinelodge, Inc (Nelso Antolotti), Zimmer Technology Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Medicinelodge, Inc (Nelso Antolotti), Zimmer Technology Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Justin, Daniel F., Goble, E. Marlowe, Hodorek, Robert A., Creger, Carlyle J.
• Granted Patent: US 7,695,477 B2
• Time in Patent Office: Days
• US Class Current: 606/79
• CPC Class Codes: A61B 17/1675 for the knee
• CPC Class Codes: A61B 17/1767 for the patella
• CPC Class Codes: A61B 2017/1602 Mills
• CPC Class Codes: A61B 2090/034 abutting on parts of the device itself
• CPC Class Codes: A61B 2090/062 penetration depth

Abstract

A milling system for use in resecting at least a portion of a joint articulation surface of a bone includes a template having a base with a top surface, an opposing bottom surface, and an opening extending therebetween. One or more fasteners are used to removably mount the template on a bone. A guide is movably mounted on the template and projecting across at least a portion of the opening of the template. The guide is selectively movable across at least a portion of the opening of the template. A rotatable mill is mounted on the guide. The mill is selectively movable along at least a portion of the length of the guide.

Claims

1. A milling system for use in resecting at least a portion of a joint articulation surface of a bone, the system comprising:

a template comprising a base having a top surface and an opposing bottom surface with an opening extending therebetween, at least two support legs projecting from the base so as to project below the bottom surface;

means for removably mounting the template on a bone when the at least two support legs are resting on the bone so as to suspend at least a portion of the base of the template above the bone; and

a rotatable mill engaged with the template so as to be selectively movable within the opening of the template.

2. The milling system as recited in claim 1, wherein the at least two support legs comprise at least three spaced apart support legs projecting from the bottom surface of the base.

3. The milling system as recited in claim 2, wherein the means for removably mounting comprises:

at least three spaced apart mounting holes formed on the template, each mounting hole extending through a corresponding one of the support legs; and

at least three fasteners, each fastener being adapted to pass through a corresponding one of the mounting holes and engage the bone.

4. The milling system as recited in claim 1, wherein the at least two support legs are integrally formed with or permanently attached to the base.

5. The milling system as recited in claim 1, wherein a portion of the base has a substantially V-shaped contour.

6. The milling system as recited in claim 1, wherein the means for removably mounting comprises at least one mounting hole formed on the template and a fastener adapted to pass through the at least one mounting hole and engage the bone.

7. The milling system as recited in claim 6, wherein the base comprises:

an annular ring that encircles the opening; and

at least three spaced apart hubs projecting from the annular ring into the opening, each hub having a corresponding mounting hole extending therethrough.

8. The milling system as recited in claim 1, further comprising:

an elongated guide mounted to the template and projecting across at least a portion of the opening of the template;

a retainer slidably coupled with the guide; and

a tubular sleeve having a passage extending therethrough, the tubular sleeve being coupled with the retainer, the mill being rotatably disposed within the tubular sleeve.

9. A milling system for use in resecting at least a portion of a joint articulation surface of a bone, the system comprising:

a template comprising a base having a top surface and an opposing bottom surface with an opening extending therebetween;

means for removably mounting the template on a bone;

a guide movably mounted on the template and projecting across at least a portion of the opening of the template, the guide being selectively movable across at least a portion of the opening of the template; and

a rotatable mill mounted on the guide, the mill being selectively movable along at least a portion of the length of the guide.

10. The milling system as recited in claim 9, further comprising at least two spaced apart support legs projecting from the base so as to extend below the bottom surface.

11. The milling system as recited in claim 9, wherein the means for removably mounting comprises:

at least three spaced apart mounting holes formed on the template; and

at least three fasteners, each fastener being adapted to pass through a corresponding one of the mounting holes and engage the bone.

12. The milling system as recited in claim 9, wherein the template further comprising a bracket projecting from the base and extending along the length of the opening of the template, the guide being coupled with and selectively movable along the length of the bracket.

13. The milling system as recited in claim 12, wherein the guide comprises a carriage coupled with the bracket and a pair of spaced apart arms projecting from the carriage and across at least a portion of opening of the template.

14. The milling system as recited in claim 13, further comprising:

a retainer having a tubular sleeve coupled therewith, the mill being disposed within the tubular sleeve; and

means for coupling the retainer to the guide so that the retainer can selectively move along the length of the guide.

15. The milling system as recited in claim 14, wherein the means for coupling comprises:

each arm of the guide having a slot formed along the length thereof; and

a post projecting from each side of the retainer, the retainer being disposed between the arms of the guide with each post being slidably disposed within the slot of a corresponding arm.

16. The milling system as recited in claim 9, further comprising a brace movable mounted on the template so as to extend over a portion of the opening of the template, the mill being supported by the brace.

17. The milling system as recited in claim 16, further comprising a tubular sleeve having a passage extending therethrough, the mill being rotatably disposed within the tubular sleeve, the tubular sleeve being coupled with the brace.

18. A milling system for use in resecting at least a portion of a joint articulation surface of a bone, the system comprising:

a template comprising a base having a top surface and an opposing bottom surface with an opening extending therebetween;

means for removably mounting-the template on a bone;

a brace movably mounted on the template so as to extend over a portion of the opening of the template; and

a rotatable mill supported by the brace, at least a portion of the mill being disposed within the opening of the template.

19. The milling system as recited in claim 18, further comprising at least two spaced apart support legs projecting from the base so as to extend below the bottom surface of the base.

20. The milling system as recited in claim 18, wherein the means for removably mounting the template on the bone comprises:

a plurality of mounting holes formed on the template; and

a plurality of fasteners, each fastener being adapted to pass through a corresponding one of the mounting holes and engage the bone.

21. The milling system as recited in claim 20, wherein the base comprises:

an annular ring that encircles the opening; and

at least three spaced apart hubs projecting from the annular ring into the opening, each hub having a corresponding one of the mounting holes extending therethrough.

22. The milling system as recited in claim 18, wherein the brace is pivotably mounted to the template.

23. The milling system as recited in claim 18, wherein the brace is slidably mounted to the template.

24. The milling system as recited in claim 18, further comprising a tubular sleeve having a passage extending therethrough, the mill being rotatably disposed within the tubular sleeve, the tubular sleeve being coupled with the brace.

25. The milling system as recited in claim 24, further comprising:

the template further comprising a bracket projecting from the base and extending along the length of the opening;

the brace being movably mounted on the bracket; and

a guide being coupled with and selectively movable along the length of the bracket, wherein the opening of the template, the brace, and the guide can be vertically aligned.

26. The milling system as recited in claim 25, further comprising a retainer movably coupling the tubular sleeve to the guide.

27. A system for use in resecting at least a portion of a joint articulation surface of a bone, the system comprising:

a mill comprising an elongated shaft having a burr mounted on an end thereof;

a tubular sleeve having a passage extending therethough, the mill being rotatably disposed within the tubular sleeve;

a retainer having a passage extending therethrough with the tubular sleeve being at least partially disposed within the passage, the retainer being releasably lockable to the tubular sleeve at at least two spaced apart locations along the length of the tubular sleeve; and

an elongated guide, the retainer being movably coupled with the guide.

28. The system as recited in claim 27, further comprising a bearing disposed within the tubular sleeve and encircling the mill.

29. The system as recited in claim 27, further comprising:

a plurality of notches recessed on an exterior surface of the tubular sleeve, the plurality of notches being spaced longitudinally along the length of the tubular sleeve; and

the retainer comprising at least one resiliently biased finger engaging with a select one of the plurality of notches.

30. The system as recited in claim 27, wherein the guide comprises a head and a pair of spaced apart arms projecting from the head.

31. The system as recited in claim 30, further comprises:

each arm of the guide having a slot formed along the length thereof; and

a post projecting from each side of the retainer, the retainer being disposed between the arms of the guide with each post being slidably disposed within the slot of a corresponding arm.

32. The system as recited in claim 27, further comprising a template comprising a base having a top surface and an opposing bottom surface with an opening extending therebetween, the guide being movably mounted to the template and a portion of the mill being disposed within the opening of the template.