Instruments and techniques for disc space preparation

• US 20060195109A1
• Filed: 04/24/2006
• Published: 08/31/2006
• Est. Priority Date: 02/22/2000
• Status: Active Grant

• Current Assignee: Eric C Lange, Steven D. DeRidder, Thomas V. Mcgahan
• Original Assignee: Eric C Lange, Steven D. DeRidder, Thomas V. Mcgahan
• Inventors: Lange, Eric C., DeRidder, Steven D., McGahan, Thomas V.
• Granted Patent: US 8,206,397 B2
• Time in Patent Office: Days
• US Class Current: 606/80
• CPC Class Codes: A61B 17/025 Joint distractors
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1671 for the spine
• CPC Class Codes: A61B 17/1757 for the spine
• CPC Class Codes: A61B 2017/0256 for the spine
• CPC Class Codes: A61B 2017/1602 Mills
• CPC Class Codes: A61B 2090/033 Abutting means, stops, e.g. abutting on tissue or skin
• CPC Class Codes: A61B 2090/062 penetration depth
• 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 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/30113 circular
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30772 Apertures or holes, e.g. of circular cross section
• CPC Class Codes: A61F 2002/30828 parallel
• CPC Class Codes: A61F 2002/30879 Ribs
• CPC Class Codes: A61F 2002/4627 with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2230/0006 circular

Abstract

A series of instruments (30, 80, 120, 210, 510, 550) are provided for direct-anterior and oblique-anterior disc space and end plate preparation. The instruments (30, 80, 120, 210, 510, 550) provide precise guidance for channel formation in the vertebral endplates by guiding rotating and bladed cutting instruments (122, 250, 580). Instrumentation (550) for oblique-anterior disc space preparation includes compound angulation to account for the angle of approach to the spine and the angulation between adjacent vertebrae. Methods and techniques for use of the instruments (30, 80, 120, 210, 510, 550) are also described.

Claims

1-20. -20. (canceled)

21. A medical instrument for preparation of a disc space between adjacent vertebrae of a patient, comprising:

a distractor including a distraction head adapted to distract the adjacent vertebrae from an oblique approach with respect to a sagital plane of the patient, said distraction head having a first leading edge and a second angled leading edge, said second leading edge being obliquely angled with respect to said first leading edge, wherein said first leading edge and said second leading edge each have adjoining upper and lower tapered surfaces.

22. The instrument of claim 21, wherein said upper and lower tapered surfaces respectively adjoin upper and lower distraction surfaces.

23. The instrument of claim 22, wherein said upper distraction surface terminates in an upper bone engaging surface, and said lower distraction surface terminates in a lower bone engaging surface.

24. The instrument of claim 23, wherein said upper and lower bone engaging surfaces are each defined by a concave arcuate surface based on an off-centered radius of curvature.

25. The instrument of claim 24, wherein said distractor further includes a shaft coupled to said distraction head, wherein said shaft has a tool engaging end adapted to engage a tool.

26. The instrument of claim 25, wherein said distraction head has a pair of opposing sidewalls adjoining said upper and lower distraction surfaces, said distraction head has an offset slot defined therein, wherein said slot is off center with respect to a centerline of said distraction head that parallelly extends between said sidewalls.

27. The instrument of claim 26, further comprising a guiding fin having a height greater than corresponding portions of said distraction head provided in said slot, wherein said fin is adapted to cut a guide channel in the vertebrae to maintain proper orientation of said distraction head during insertion.

28. The instrument of claim 21, further comprising an offset slot defined in said distraction head and a guiding fin having a height greater than corresponding portions of said distraction head provided in said slot, wherein said fin is adapted to cut a guide channel in the vertebrae to maintain proper orientation of said distraction head during insertion.

29. The instrument of claim 21, further comprising a distraction window having a working channel defined therein, said distractor being provided in said working channel, said distraction window being adapted to engage the adjacent vertebrae from the oblique approach with respect to the sagital plane of the patient.

30. The instrument of claim 29, further comprising a guide tube having a locking mechanism coupled to said distraction window.

31-43. -43. (canceled)