External tibial mill guide and method of use

Patent metadata

Field	Value
Publication number	US-9138259-B2
Application number	US-201213720659-A
Country	US
Kind code	B2
Filing date	Dec 19, 2012
Priority date	Dec 19, 2012
Publication date	Sep 22, 2015
Grant date	Sep 22, 2015

Abstract

A cutting guide includes a jig assembly that is configured to attach to a second surface of a bone. The jig assembly includes a guide block that defines a jig recess and that is configured to be disposed adjacent to the first surface. Also, the cutting guide includes a tool support that is moveably coupled to the jig assembly, and the tool support is configured to couple to the cutting tool and moveably support the cutting tool on the jig assembly. Moreover, the cutting guide includes an adapter that is removably received within the jig recess to adapt a dimension of the jig recess according to a corresponding dimension of the pocket. The adapter includes at least one adapter surface that is configured to abut the guide portion of the cutting tool to thereby limit movement of the cutting portion relative to the first surface of the bone.

First claim

What is claimed is:

1. A cutting guide for guiding cutting of a pocket within a first surface of a bone by a cutting tool, the bone also including a second surface that is spaced away from the first surface, the cutting tool including a cutting portion and a guide portion, the cutting guide comprising:
a jig assembly configured to attach to the second surface of the bone, the jig assembly including a guide block that is configured to be disposed adjacent to the first surface, the guide block defining a jig recess;
a tool support that is moveably coupled to the jig assembly, the tool support configured to couple to the cutting tool and moveably support the cutting tool on the jig assembly; and
an adapter that is removably received within the jig recess to adapt a dimension of the jig recess according to a corresponding dimension of the pocket, the adapter including at least one adapter surface that is configured to abut the guide portion of the cutting tool to thereby limit movement of the cutting portion relative to the first surface of the bone.

2. The cutting guide of claim 1 , wherein the second surface is an anterior surface of a tibia, and the first surface is a superior surface of the tibia, the jig assembly being configured to attach to the anterior surface of the tibia.

3. The cutting guide of claim 1 , wherein the adapter is generally D-shaped and includes a through hole.

4. The cutting guide of claim 1 , wherein the pocket has a depth dimension and a transverse dimension, wherein the adapter includes a first adapter surface configured to limit movement of the cutting portion according to the transverse dimension of the pocket.

5. The cutting guide of claim 1 , wherein the pocket has a depth dimension and a transverse dimension, wherein the adapter includes a second adapter surface configured to limit movement of the cutting portion according to the depth dimension of the pocket.

6. The cutting guide of claim 1 , wherein the tool support is moveable within a Cartesian coordinate system relative to the jig assembly, and wherein the tool support is constrained against movement along at least one linear axis within the Cartesian coordinate system and is moveably coupled to the jig assembly along at least one other linear axis within the Cartesian coordinate system.

7. The cutting guide of claim 6 , wherein the tool support is moveable along a first linear axis of the Cartesian coordinate system, and the tool support is configured to slidably support the cutting tool for movement along a second linear axis of the Cartesian coordinate system, the first and second linear axes being perpendicular to each other.

8. The cutting guide of claim 1 , wherein the jig assembly includes an attachment body that is configured to removably attach to the second surface of the bone, wherein the guide block is moveably attached to the attachment body.

9. The cutting guide of claim 8 , wherein the guide block is rotatably attached to the attachment body.

10. The cutting guide of claim 8 , further comprising a retaining device that is configured to selectively fix the guide block relative to the attachment body.

11. The cutting guide of claim 1 , further comprising an alignment rod that is coupled to the jig assembly, the alignment rod configured to align with a bone axis of the bone to thereby orient the guide block relative to the bone axis.

12. The cutting guide of claim 1 , further comprising a sizer with a coupling portion and a sizing portion, the coupling portion being received within the jig recess to thereby locate the sizing portion over the first surface of the bone such that relative sizes of the first surface and the sizing portion are comparable.

13. The cutting guide of claim 1 , further comprising the cutting tool.

14. A method of forming a pocket within a first surface of a bone using a cutting tool, the bone also including a second surface that is spaced away from the first surface, the cutting tool including a cutting portion and a guide portion, the method comprising:
determining a pocket dimension of the pocket;
attaching a jig assembly with a guide block that defines a jig recess to the second surface of the bone;
selecting an adapter according to the determined pocket dimension;
removably positioning the selected adapter within the jig recess to adapt a dimension of the jig recess according to the determined pocket dimension;
coupling the cutting tool to a tool support of the jig assembly;
moving the cutting tool and the tool support relative to the jig assembly and the adapter while the cutting tool is coupled to the tool support such that the cutting portion cuts the pocket in the first surface; and
abutting the guide portion against an adapter surface of the adapter to limit movement of the cutting portion relative to the first surface of the bone according to the determined pocket dimension.

15. The method of claim 14 , wherein determining the pocket dimension includes coupling a coupling portion of a sizer to the jig assembly to thereby locate a sizing portion of the sizer over the first surface of the bone, and further comprising comparing relative sizes of the first surface and the sizing portion.

16. The method of claim 15 , wherein coupling the cutting tool to the tool support results in the guide portion of the cutting tool being received in the jig recess.

17. The method of claim 14 , wherein moving the cutting tool and the tool support relative to the jig assembly includes cooperatively moving the cutting tool and the tool support within a Cartesian coordinate system relative to the jig assembly, and wherein the tool support is constrained against movement along at least one linear axis within the Cartesian coordinate system.

18. The method of claim 17 , wherein moving the cutting tool and the tool support relative to the jig assembly includes cooperatively moving the cutting tool and the tool support along a first linear axis of the Cartesian coordinate system, and sliding the cutting tool relative to the tool support along a second linear axis of the Cartesian coordinate system, the first and second linear axes being perpendicular to each other.

19. The method of claim 14 , wherein attaching the jig assembly to the second surface of the bone includes attaching the jig assembly to an anterior surface of a tibia, wherein the first surface is a superior surface of the tibia.

20. The method of claim 14 , wherein the pocket has a depth dimension and a transverse dimension, and wherein moving the cutting tool and the tool support relative to the jig assembly includes abutting a first adapter surface of the adapter and the guide portion to limit movement of the cutting portion according to the transverse dimension of the pocket.

21. The method of claim 14 , wherein the pocket has a depth dimension and a transverse dimension, and wherein moving the cutting tool and the tool support relative to the jig assembly includes abutting a second adapter surface and the guide portion to limit movement of the cutting portion according to the depth dimension of the pocket.

22. The method of claim 14 , further comprising moving the guide block relative to an attachment body of the jig assembly while the attachment body is removably attached to the second surface of the bone.

23. The method of claim 14 , further comprising aligning an alignment rod with a bone axis of the bone to thereby orient the guide block relative to the bone axis.

24.

Assignees

• Biomet Sports Medicine Llc

Inventors

• Maxson William
• Berelsman Brian K

Classifications

• A61B17/16

  Instruments for performing osteoclasis; Drills or chisels for bones; Trepans {(arthroscopic bone cutters A61B17/320016)} · CPC title

• A61B17/17

  Guides {or aligning means} for drills {, mills, pins or wires} · CPC title

• A61B17/1675

  for the knee · CPC title

• A61B17/1764

  for the knee · CPC title

• A61B2017/1602

  Mills · CPC title