Implant for stabilizing a bone graft during spinal fusion

• US 20060276897A1
• Filed: 12/14/2005
• Published: 12/07/2006
• Est. Priority Date: 12/13/2004
• Status: Active Grant

• Current Assignee: Kyphon SARL (Medtronic Plc)
• Original Assignee: St. Francis Medical Technologies, Inc. (Medtronic Plc)
• Inventors: Flynn, John J., Mitchell, Steven T., Zucherman, James F., Winslow, Charles J., Hsu, Ken Y., Yerby, Scott A., Fair, Christopher
• Granted Patent: US 8,066,749 B2
• Time in Patent Office: Days
• US Class Current: 623/17.110
• CPC Class Codes: A61B 17/025 Joint distractors
• CPC Class Codes: A61B 17/562 Implants for placement in joint gaps without restricting joint motion, e.g. to reduce arthritic pain
• CPC Class Codes: A61B 17/7059 Cortical plates A61B17/7007, A61B17/7058 take precedence
• CPC Class Codes: A61B 17/7064 Devices acting on, attached to, or simulating the effect of, vertebral facets; Tools therefor
• 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 17/8042 the additional component being a cover over the screw head
• CPC Class Codes: A61B 17/8635 Tips of screws
• CPC Class Codes: A61B 2017/0256 for the spine
• CPC Class Codes: A61B 2017/8655 with special features for locking in the bone
• CPC Class Codes: A61B 2090/061 for measuring dimensions, e.g. length
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/30771 applied in original prostheses, e.g. holes or grooves
• CPC Class Codes: A61F 2/4405 for apophyseal or facet joints, i.e. between adjacent spinous or transverse processes devices implanted between spinous or transverse processes A61B17/7062
• 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 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/30079 magnetic
• CPC Class Codes: A61F 2002/30092 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2002/3013 figure-"8"- or hourglass-shaped
• CPC Class Codes: A61F 2002/30176 V-shaped
• CPC Class Codes: A61F 2002/30308 : banana-shaped
• CPC Class Codes: A61F 2002/30378 : Spherically-shaped protrusion and recess
• 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 2002/30462 : retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2002/30471 : connected by a hinged linkage mechanism, e.g. of the single-bar or multi-bar linkage type
• CPC Class Codes: A61F 2002/30517 : using a locking plate
• CPC Class Codes: A61F 2002/30528 : Means for limiting said movement
• CPC Class Codes: A61F 2002/30538 : for adjusting angular orientation
• CPC Class Codes: A61F 2002/30563 : having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
• CPC Class Codes: A61F 2002/30566 : Helical springs
• CPC Class Codes: A61F 2002/30578 : having apertures, e.g. for receiving fixation screws
• CPC Class Codes: A61F 2002/30601 : telescopic
• CPC Class Codes: A61F 2002/30639 : having rolling elements between both articulating surfaces
• CPC Class Codes: A61F 2002/30708 : Means for distinguishing between left-sided and right-sided devices, Sets comprising both left-sided and right-sided prosthetic parts
• CPC Class Codes: A61F 2002/30769 : madreporic
• CPC Class Codes: A61F 2002/30841 : Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30878 : with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• 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 2002/4661 : for measuring thickness
• CPC Class Codes: A61F 2210/0014 : using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2210/009 : magnetic
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 : made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2220/0075 : sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2220/0091 : connected by a hinged linkage mechanism, e.g. of the single-bar or multi-bar linkage type
• CPC Class Codes: A61F 2230/001 : Figure-8-shaped, e.g. hourglass-shaped
• CPC Class Codes: A61F 2230/0054 : V-shaped
• CPC Class Codes: A61F 2230/0063 : Three-dimensional shapes
• CPC Class Codes: A61F 2250/0006 : for adjusting angular orientation
• CPC Class Codes: A61F 2250/0084 : Means for distinguishing between left-sided and right-sided devices; Sets comprising both left-sided and right-sided prosthetic parts
• CPC Class Codes: A61F 2310/00011 : Metals or alloys
• CPC Class Codes: A61F 2310/00796 : Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite
• CPC Class Codes: A61F 2310/00976 : Coating or prosthesis-covering structure made of proteins or of polypeptides, e.g. of bone morphogenic proteins BMP or of transforming growth factors TGF

Abstract

Systems and method in accordance with the embodiments of the present invention can include an implant for positioning at a vertebra for resisting the expulsion of a bone graft from within an intervertebral space. The implant includes a buttress plate having an intervertebral plate and an anchoring plate connected such that the intervertebral plate can move relative to the anchoring plate.

Claims

1. A method for retaining a fusion plug in place in the disk space between adjacent vertebrae, the method including:

selecting a buttress plate having an anchoring plate and an intervertebral plate with the intervertebral plate connected to the buttress plate;

positioning the anchoring plate relative to a vertebra and the intervertebral plate relative to the fusion plug; and

anchoring the anchoring plate into the vertebra with the intervertebral plate positioned over the fusion plug so that the fusion plug can not be expelled from between the disk space.

2. The method of claim 1 wherein the positioning step included pivoting the intervertebral plate relative to the anchoring plate.

3. The method of claim 1 wherein the anchoring step includes using a screw to anchor the anchoring plate to the vertebra.

4. The method of claim 3 including using a locking screw to lock the screw in place.

5. The method of claim 1 including the anchoring plate having protrusions and the step of using the protrusions to fix to position of the anchoring plate relative to the vertebra.

6. A method for retaining a fusion plug in place in the disk space between adjacent vertebrae, the method including:

selecting a buttress plate having an anchoring plate and an intervertebral plate with the intervertebral plate hinged to the buttress plate;

positioning the anchoring plate relative to a vertebra and the intervertebral plate relative to the fusion plug; and

anchoring the anchoring plate into the vertebra with the intervertebral plate positioned over the fusion plug so that the fusion plug can not be expelled from between the disk space.

7. The method of claim 6 wherein the positioning step included pivoting the intervertebral plate relative to the anchoring plate.

8. The method of claim 6 wherein the anchoring step includes using a screw to anchor the anchoring plate to the vertebra.

9. The method of claim 8 including using a locking screw to lock the screw in place.

10. The method of claim 6 including the anchoring plate having protrusions and the step of using the protrusions to fix to position of the anchoring plate relative to the vertebra.

11. An implant to resist expulsion of a bone graft from between two vertebrae, the implant comprising:

a buttress plate including;

an anchoring plate adapted to be fixedly associated with one of the two vertebrae, the anchoring plate including a bore;

an intervertebral plate connected with the anchoring plate, the intervertebral plate being adapted to extend across at least a portion of an intervertebral space between the two vertebrae; and

wherein the intervertebral plate is pivotable relative to the anchoring plate; and

a bone screw received through the bore.

12. The implant of claim 11, wherein the intervertebral plate is pivotably connected with the anchoring plate by one of a hinge and a ball-in-socket arrangement.

13. The implant of claim 11, further comprising:

a locking screw adapted to block the bone screw from at least one of a backward displacement and a rotational displacement.

14. The implant of claim 13, wherein:

the locking screw includes a chisel-point end; and

the chisel point end self-cuts the locking screw into the vertebra.

15. The implant of claim 13, further comprising:

a locking plate, including;

a first locking screw bore;

a keel; and

a protuberance; and

wherein the anchoring plate includes a second locking screw bore adapted to align with the first locking screw bore for receipt of a locking screw;

wherein the protuberance is adapted to be received at least partially within the bore.