Method and apparatus for reaming an acetabulum

• US 20080009874A1
• Filed: 06/14/2006
• Published: 01/10/2008
• Est. Priority Date: 06/14/2006
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Meridew, Jason D., Parcher, Kim S.
• Granted Patent: US 7,670,343 B2
• Time in Patent Office: Days
• US Class Current: 606/81
• CPC Class Codes: A61B 17/1666 for the acetabulum
• CPC Class Codes: A61B 17/1746 for the acetabulum
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61B 50/33 Trays
• CPC Class Codes: A61F 2/4609 of acetabular cups
• CPC Class Codes: A61F 2002/30736 Augments or augmentation pieces, e.g. wedges or blocks for bridging a bone defect
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/3401 with radial apertures, e.g. radial bores for receiving fixation screws
• CPC Class Codes: A61F 2002/3403 Polar aperture
• CPC Class Codes: A61F 2002/4629 connected to the endoprosthesis or implant via a threaded connection
• CPC Class Codes: A61F 2002/4681 by applying mechanical shocks, e.g. by hammering

Abstract

A method and apparatus for repairing a cavity in bone may can include a longitudinal shaft having a distal end and a proximal end. A cutting tool can be selectively attachable to the distal end. A one-piece guide can have a body defining an opening and including a locator member extending therefrom. The locator member can be engageable to a first portion of the bone providing a reference point relative to the cutting tool while the cutting tool engages a second portion of the bone during cutting. The body can be slidably advanced onto the longitudinal shaft through the opening from the proximal end to an operating location in an assembled position. During operation, the body can define a handle concentric with the longitudinal shaft.

Claims

1. A tool for reaming a cavity in bone comprising:

a longitudinal shaft having a distal end and a proximal end;

a cutting tool selectively attachable to said distal end;

a one-piece guide having a body defining an opening and including a unitarily formed locator member extending therefrom, wherein said locator member is engageable to a first portion of the bone providing a reference point relative to said cutting tool while said cutting tool engages a second portion of the bone during cutting; and

wherein said body is slidably advanced onto said longitudinal shaft through said opening from said proximal end to an operating location in an assembled position.

2. The tool of claim 1 wherein during operation said body defines a handle concentric with said longitudinal shaft.

3. The tool of claim 2 wherein said body defines an arm operably connected between said locator member and said body, wherein said arm defines a first section arranged generally parallel to an axis defined by said longitudinal shaft and a second section arranged at an angle relative to said axis.

4. The tool of claim 3 wherein said arm defines a third section operatively coupled between said locator member and said second section, said third section arranged generally parallel to said first section.

5. The tool of claim 1 wherein said locator member generally defines a spherical outer engaging surface.

6. The tool of claim 5 wherein said locator member defines a concave recess defined on an inner surface, said concave recess accommodating said cutting tool.

7. The tool of claim 6 wherein said longitudinal shaft includes a stop member arranged thereon, said stop member moveable between an install position wherein said guide slidably passes over said stop member and an operating position wherein said guide is precluded from advancing beyond said stop member.

8. The tool of claim 7 wherein said stop member comprises a spring biased pin.

9. The tool of claim 8 wherein said longitudinal shaft is selectively translatable through said opening of said body in the operating position, said stop member engaging said guide.

10. A tool for reaming a cavity in bone comprising:

a longitudinal shaft having a distal end and a proximal end;

a cutting tool selectively attachable to said distal end;

a guide having a body defining an opening and including a locator member extending therefrom, wherein said locator member is engageable to a first portion of the bone while said cutting tool engages a second portion of the bone during cutting; and

wherein said guide defines a handle concentric with said longitudinal shaft.

11. The tool of claim 10 wherein said body defines an arm operably connected between said locator member and said body, wherein said arm defines a first section arranged generally parallel to an axis defined by said longitudinal shaft and a second section arranged at an angle relative to said axis.

12. The tool of claim 11 wherein said arm defines a third section operatively coupled between said locator member and said second section, said third section arranged generally parallel to said first section.

13. The tool of claim 10 wherein said locator member generally defines a spherical outer engaging surface.

14. The tool of claim 13 wherein said locator member defines a concave recess defined on an inner surface, said concave recess accommodating said cutting tool.

15. The tool of claim 14 wherein said longitudinal shaft includes a stop member arranged thereon, said stop member moveable between an install position wherein said guide slidably passes over said stop member and an operating position wherein said guide is precluded from advancing beyond said stop member.

16. The tool of claim 15 wherein said stop member comprises a spring biased pin.

17. The tool of claim 16 wherein said longitudinal shaft is selectively translatable through said opening of said body in the operating position, said stop member engaging said guide.

18. The tool of claim 11, further comprising a set of locator members selectively attachable to said arm.

19. The tool of claim 11, further comprising a set of integrally formed locator members and arms selectively attachable to said body.

20. The tool of claim 10 wherein said body includes a first and a second body defining a first and a second opening, respectively, for receiving said longitudinal shaft, wherein said first body is selectively attached to said guide such that said longitudinal shaft defines a first offset relative to said locator member and wherein said second body is selectively attached to said guide such that said longitudinal shaft defines a second offset relative to said locator member, wherein said first and second offsets are distinct.

21. A method for reaming a cavity in bone comprising:

reaming an acetabular cavity with a reamer having a longitudinal shaft;

attaching a guide member to the longitudinal shaft;

positioning the guide member in the reamed cavity thereby providing a reference point relative to the reamer, the guide member defining a handle concentric with the longitudinal shaft;

grasping the handle of the guide member with a first hand and grasping the longitudinal shaft with a second hand; and

reaming a defect adjacent the reamed cavity with the reamer.

22. The method of claim 21 wherein attaching the guide member includes slidaby advancing a body of the guide member onto said longitudinal shaft through an opening in the body.

23. The method of claim 22 wherein attaching the guide member further includes advancing the guide member from a proximal end of the longitudinal shaft.

24. The method of claim 23 wherein reaming the defect includes slidably advancing the longitudinal shaft through the opening of the guide member between stopping members arranged on the longitudinal shaft, the stopping members defining a range of travel.