Laminoplasty methods using hinge device

• US 8,435,265 B2
• Filed: 03/18/2009
• Issued: 05/07/2013
• Est. Priority Date: 03/18/2009
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Spine Incorporated (Johnson & Johnson)
• Inventors: Konieczynski, David D., Hawkins, John R., Slivka, Michael A., Zalenski, Ed, Page, Jayson S., Mazzuca, Michael, Jacene, Michael
• Primary Examiner(s): Hammond, Ellen C
• Assistant Examiner(s): JOHANAS, JACQUELINE T
• Application Number:
  US12/406,726
• Publication Number:
  US 20100241165A1
• Time in Patent Office: 1,511 Days
• Field of Search: 606246-279, 606/282, 606/299, 606283-285
• US Class Current: 606/246
• CPC Class Codes: A61B 17/7059 Cortical plates A61B17/7007, A61B17/7058 take precedence
• CPC Class Codes: A61B 17/7071 Implants for expanding or repairing the vertebral arch or wedged between laminae or pedicles; Tools therefor
• CPC Class Codes: A61B 17/808 Instruments for holding or positioning bone plates, or for adjusting screw-to-plate locking mechanisms
• CPC Class Codes: A61B 17/863 with thread interrupted or changing its form along shank, other than constant taper
• CPC Class Codes: A61B 17/866 Material or manufacture
• CPC Class Codes: A61B 2017/8655 with special features for locking in the bone
• CPC Class Codes: A61B 2090/037 with a frangible part, e.g. by reduced diameter

Abstract

A vertebra implant is provided that includes an elongate body with a first end configured to mate the first end to a first location on a vertebra, and a second end having at least one fastener configured to mate the second end to a second location on a vertebra. The elongate body also includes a deformable portion extending between the first and second ends that has an unexpanded configuration in which the deformable portion is configured to allow a tool to cut bone extending between the first and second ends when the first and second ends are mated to first and second locations on a vertebra, and an expanded configuration in which the deformable portion is deformed to increase a distance between the first and second ends such that a gap is created in the cut bone. The deformable portion is configured to maintain the first and second ends at a fixed distance apart when the deformable portion is in the expanded configuration. A vertebral implant is also provided that includes an elongate member configured to extend into a vertebra and form a hinge therein using a breakage point located along a length of the elongate member.

Claims

1. A laminoplasty implant, comprising:

an elongate body having

a first elongate plate having only two fastener holes formed therein and configured to receive fasteners to mate the first elongate plate to a first location on a vertebra, the only two fastener holes in the first elongate plate defining a first axis,

a second elongate plate having only two fastener holes formed therein and configured to receive fasteners to mate the second elongate plate to a second location on a vertebra, the only two fastener holes in the second elongate plate defining a second axis, the second axis extending substantially perpendicular to the first axis, and

a deformable portion coupled to, integrally formed with, and extending between the first and second elongate plates, the deformable portion having a first portion extending along a third axis that extends transverse to the first and second axes, and a second portion extending along a fourth axis that extends transverse to the first, second, and third axes, the first portion and the second portion abutting at a bend which defines an apex, and the deformable portion having an unexpanded configuration in which the first and second elongate plates are a distance apart from one another, and the deformable portion being configured to be deformed into an expanded configuration in which the distance between the first and second elongate plates is increased such that a gap is created in a cut bone, the deformable portion being configured to maintain the first and second elongate plates at a fixed distance apart when the deformable portion is in the expanded configuration, wherein the bend defining the apex is present in both the expanded and unexpanded configurations, wherein entireties of the first elongate plate, the second elongate plate, the apex all of the fastener holes, and the deformable portions all lie in substantially the same plane in the unexpanded configuration the elongate body further comprising a first feature formed between the two fastener holes of the first elongate plate and the deformable portion and a second feature formed between the two fastener holes of second elongate plate and the deformable portion, the first and second features are notches recessed into the outer perimeter of the first and second elongate plates, respectively, and the first and second features face one another such that a tool having first and second jaws that pivot relative to one another can be positioned in the first and second features to apply a force to the first and second elongate plates to move the deformable portion to the expanded configuration, wherein the first feature is located on the first axis and the second feature is offset from the second axis.

2. The implant of claim 1, wherein the deformable portion has at least one u-shaped region.

3. The implant of claim 1, wherein the deformable portion has at least one bend formed therein in the unexpanded configuration, and wherein the deformable portion is substantially linear in the expanded configuration.

4. The implant of claim 1, wherein the deformable portion is substantially v-shaped in the unexpanded configuration.

5. The implant of claim 1, wherein the deformable portion includes a bend having an angle that is about 40°

or less in the unexpanded configuration.

6. The implant of claim 1, wherein the deformable portion has at least one v-shaped region.