Instrumentation for knee resection

• US 7,789,885 B2
• Filed: 02/15/2005
• Issued: 09/07/2010
• Est. Priority Date: 01/15/2003
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Metzger, Robert
• Primary Examiner(s): Robert; Eduardo C
• Assistant Examiner(s): Comstock; David
• Application Number:
  US11/058,527
• Publication Number:
  US 20050149042A1
• Time in Patent Office: 2,030 Days
• Field of Search: 606/86.R, 606/87, 606/88, 606/89, 606/79, 606/82, 606/96, 606/102, 335/11, 335/12
• US Class Current: 606/88
• CPC Class Codes: A61B 17/02 for holding wounds open; Tractors specula A61B1/32 ; drainage appliances for wounds A61M27/00
• CPC Class Codes: A61B 17/14 Surgical saws A61B17/1637 takes precedence; tooth saws A61C3/12 ; Accessories therefor
• CPC Class Codes: A61B 17/142 with reciprocating saw blades, e.g. with cutting edges at the distal end of the saw blades
• CPC Class Codes: A61B 17/144 with cutting edges at the side of the saw blades
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/157 Cutting tibia
• CPC Class Codes: A61B 2090/061 for measuring dimensions, e.g. length

Abstract

A modular sizing device for a bone. The sizing device includes a sizer base positionable relative to the bone, a stylus, and a coupler operable to magnetically couple the base to the stylus for measuring a size of the bone.

Claims

1. A modular sizing device for a bone comprising:

a sizer base positionable relative to the bone;

a stylus including a handle, a tip, and a plate positioned between the handle and the tip and made of magnetic material and having a first elongated planar surface; and

a coupler operable to magnetically couple the base to the stylus for measuring a size of the bone, wherein the coupler includes a leg for rotatably coupling to the sizer base and an arm for engaging the stylus, the arm having a second elongated planar surface that extends generally perpendicular relative to a longitudinal axis of the leg, one of the stylus and the arm having a cavity that nestingly receives a magnet that magnetically attracts the first and second elongated planar surfaces.

2. The modular sizing device of claim 1, further comprising a quick release mechanism for positioning the sizer base relative to the bone.

3. The modular sizing device of claim 2, wherein the quick release mechanism includes a spring-loaded handle for gripping a post on the sizer base.

4. The modular sizing device of claim 2, wherein the quick release mechanism includes a spring-loaded handle having a plunger for engaging an aperture on the sizer base.

5. The modular sizing device of claim 1, wherein the leg is rotatably received in a bore defined in the sizer base.

6. The modular sizing device of claim 5 wherein the leg telescopically advances from the bore along the longitudinal axis of the leg.

7. The modular sizing device of claim 1 wherein the magnet is cylindrical and the cavity is defined in the arm and is cylindrical.

8. The modular sizing device of claim 1, wherein the leg is modularly connected to the arm.

9. The modular sizing device of claim 1, wherein the coupler is substantially T-shaped or L-shaped.

10. The modular sizing device of claim 1, wherein the coupler is integrally formed.

11. The modular sizing device of claim 1, further comprising a drilling guide.

12. The modular sizing device of claim 1, further comprising a foot component.

13. The modular sizing device of claim 12, wherein the foot component is modularly connected to the sizer base.

14. The modular sizing device of claim 1 wherein the first elongated planar surface slidably advances along the second elongated planar surface during sizing of the bone.

15. The modular sizing device of claim 1 wherein the plate is a substantially elongated rectangular shape.

16. The modular sizing device of claim 15 wherein the arm is a substantially elongated rectangular shape.

17. A kit of surgical components for femoral sizing, the kit comprising:

a stylus;

a sizer base;

a coupler for coupling the sizer base to the stylus;

a magnet that is received in a cavity of the coupler and that magnetically attaches to the stylus, the stylus being slidably translatable along the coupler during femoral sizing; and

a spring-loaded handle for quick-release coupling with the sizer base.

18. The kit of claim 17, further comprising:

at least one cutting block;

at least one drill guide configured for slidable coupling with the cutting block; and

at least one alignment guide configured for removable coupling with the cutting block.

19. The kit of claim 18, further comprising:

at least one stand-alone drill guide; and

at least one alignment guide for removable coupling with the stand-alone drill guide.

20. The kit of claim 18, wherein the alignment guide includes a flange receivable in a cutting slot of the cutting block.

21. The kit of claim 18, wherein the alignment guide includes a pair of feet configured to be positioned adjacent posterior condyles of a femur.

22. The kit of claim 18, further comprising at least one soft tissue retractor couplable to the cutting block.

23. The kit of claim 17, further comprising a foot component for removable coupling with the sizer base.

24. The kit of claim 17, wherein the sizer base includes a drill guide coupled thereto.

25. The modular sizing device of claim 17 wherein the stylus includes a plate made of magnetic material.

26. The modular sizing device of claim 25 wherein the plate has a first elongated planar surface.

27. The modular sizing device of claim 26 wherein the coupler has an arm that engages the stylus.

28. The modular sizing device of claim 27 wherein the arm has a second elongated planar surface that magnetically couples with the first elongated planar surface and wherein the elongated planar surface slidably translates along the first elongated planar surface while still being magnetically coupled.

29. The modular sizing device of claim 28 wherein the coupler includes a leg that rotatably couples to the sizer base.

30. The modular sizing device of claim 29 wherein the leg telescopically advances from a bore in the sizer base.

31. The modular sizing device of claim 30 wherein the leg defines a longitudinal axis that is transverse to the first and second elongated planar surfaces.

32. A method of sizing a bone using a modular sizing device, the method comprising:

positioning a sizer base relative to the bone, the sizer base having a coupler including a leg that selectively translates relative to the sizer base, the coupler having an arm extending from the leg;

magnetically coupling a stylus to the sizer base, the stylus including a handle, a tip and a plate made of magnetic material;

moving the tip of the stylus to a desired position relative to the bone while slidably advancing the plate of the stylus along the arm of the coupler; and

measuring a size of the bone based on a location of the tip of the stylus.

33. The method of claim 32, further comprising:

telescopically advancing the leg of the coupler from a bore on the sizer base;

observing an alignment of a portion of the leg with indicia provided on the sizer base; and

measuring the size of the bone based on the indicia.

34. The method of claim 32 wherein magnetically coupling the stylus to the sizer base includes magnetically coupling the plate of the stylus and the arm of the coupler along a plane that is transverse to a longitudinal axis of the leg.

35. The method of claim 32, further comprising rotatably coupling the leg to the sizer base.

36. The method of claim 32 wherein magnetically coupling the stylus to the sizer base comprises locating the plate against the arm and wherein moving the tip of the stylus comprises slidably advancing the plate of the stylus along the arm while still being magnetically coupled.

37. The method of claim 32, further comprising:

selecting one of two apertures on the sizer base; and

attaching a quick-release handle to one of the two apertures on the sizer base based on the selection.

38. The method of claim 37 wherein attaching the quick-release handle includes advancing a spring loaded plunger into locking engagement with one of two apertures defined in the sizer base.