Bone preparation instruments and methods

• US 6,635,060 B2
• Filed: 06/28/2001
• Issued: 10/21/2003
• Est. Priority Date: 07/06/2000
• Status: Expired due to Fees

• Current Assignee: Zimmer Spine, Inc. (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Sulzer Spine Tech, Inc.
• Inventors: Seme, Steven J., Longhini, Ross A., Hanson, David A.
• Primary Examiner(s): Robert, Eduardo C.
• Application Number:
  US09/896,926
• Publication Number:
  US 20020068941A1
• Time in Patent Office: 845 Days
• Field of Search: 606/79, 606/80, 606/85, 606/86, 606/96, 606/99, 606/108, 606/172, 606/183, 303/58, 302/99, 303/05, 303/15
• US Class Current: 606/79
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1659 Surgical rasps, files, planes, or scrapers
• CPC Class Codes: A61B 17/1671 for the spine
• CPC Class Codes: A61B 17/1735 for rasps or chisels
• CPC Class Codes: A61B 17/1757 for the spine
• CPC Class Codes: A61B 2017/0256 for the spine
• CPC Class Codes: A61F 2/30744 End caps, e.g. for closing an endoprosthetic cavity
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• CPC Class Codes: A61F 2/4465 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
• CPC Class Codes: A61F 2/4603 for insertion or extraction of endoprosthetic joints or of accessories thereof
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/30131 horseshoe- or crescent- or C-shaped or U-shaped
• CPC Class Codes: A61F 2002/30383 made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30599 stackable
• CPC Class Codes: A61F 2002/3082 Grooves
• CPC Class Codes: A61F 2002/30879 Ribs
• CPC Class Codes: A61F 2002/30892 parallel
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0013 : Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2250/0063 : Nested prosthetic parts

Abstract

Instruments and methods for preparing adjacent bones for fusion, and for inserting implants are disclosed. In one embodiment, the instruments include paddles for spacing the adjacent bones a predetermined distance and a cutting edge to create a channel between the adjacent bones to receive a fusion implant. In another embodiment, the instruments include a bone cutting instrument, a rasp, and an implant inserting tool. The instruments and methods are particularly advantageous for preparing a spinal fusion implant site.

Claims

1. A bone cutting instrument comprising:

a proximal end and a distal end spaced apart along a longitudinal axis of the instrument;

first and second cutting edges at the distal end, the first and second cutting edges being diametrically opposed; and

third and fourth cutting edges at the distal end, the third and fourth cutting edges being diametrically opposed and adjacent the first and second cutting edges;

wherein the first, second, third, and fourth cutting edges define an interior void, and the first and second cutting edges extend distally beyond the third and fourth cutting edges;

wherein the first and second cutting edges are radiused.

2. The bone cutting instrument according to claim 1 wherein a relationship of the first, second, third, and fourth cutting edges defines a parallelogram.

3. The bone cutting instrument according to claim 1 further comprising a shaft disposed between the proximal and distal ends, the shaft comprising an elongated opening at the proximal end, substantially perpendicular to the longitudinal axis.

4. The bone cutting instrument according to claim 3 further comprising a hollow bore extending from the proximal end to the distal end.

5. The bone cutting instrument of claim 1 further including indicator markings to determine depth of cutting.

6. A bone cutting instrument comprising:

a proximal end and a distal end spaced apart along a longitudinal axis of the instrument;

a hollow bore extending from the proximal end to the distal end;

first and second cutting edges at the distal end, the first and second cutting edges being diametrically opposed and radiused; and

third and fourth cutting edges at the distal end, the third and fourth cutting edges being diametrically opposed and adjacent the first and second cutting edges;

wherein the first, second, third, and fourth cutting edges define an interior void;

wherein a relationship of the first, second, third, and fourth cutting edges defines a parallelogram, and the first and second cutting edges extend distally beyond the third and fourth cutting edges.

7. A bone cutting instrument comprising:

a proximal end and a distal end spaced apart along a longitudinal axis of the instrument;

first and second cutting edges at the distal end, the first and second cutting edges being diametrically opposed; and

third and fourth cutting edges at the distal end, the third and fourth cutting edges being diametrically opposed and adjacent the first and second cutting edges;

wherein the first second, third, and fourth cutting edges define an interior void, wherein the first and second cutting edges have a convex curvature extending between the third and fourth cutting edges, and the first and second cutting edges extend distally beyond the third and fourth cutting edges.

8. The bone cutting instrument of claim 7 further comprising a hollow bore extending from the proximal end to the distal end.

9. The bone cutting instrument of claim 7 wherein a relationship of the first, second, third, and fourth cutting edges defines a parallelogram.