Various spinal implants are known and/or are commercially available for use in replacing the natural intervertebral disc.
The present teachings provide an implantation apparatus that can include an intervertebral implant and associated instruments for facilitating implantation.
The present teachings provide an implantation apparatus for preparing adjacent vertebral bodies to receive an intervertebral implant including a plurality of keels. The implantation apparatus includes an elongated handle portion, and a template portion carried at a distal end of the handle portion substantially perpendicularly to the handle portion. The template portion defines a plurality of open channels corresponding in position and shape to the plurality of keels. Each channel is positioned and shaped for preparing a vertebral opening to receive a corresponding keel.
In one aspect, the intervertebral implant can include first and second components defining first and second articulating surfaces, respectively. One of the implant components can define a lubrication groove circumscribing the corresponding articulating surface.
Further areas of applicability of the present teachings will become apparent from the description provided hereinafter. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present teachings.
The present teachings will become more fully understood from the detailed description and the accompanying drawings, wherein:
The following description is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
With reference to the simplified view of
Turning to the simplified side view of
Turning to the simplified view of
Turning to the simplified view of
Turning to the simplified view of
An alternative artificial disc prosthesis 40 may include one or more outwardly extending keels to provide fixation relative to an adjacent vertebral body. As shown in the simplified front view of
The keels may vary in length in the anterior-posterior direction. The keels may have a leading edge and may be a constant height throughout the entire length. The tops of the keels may include structure for enhanced fixation with the adjacent vertebral bodies. Enhanced fixation may result from bone ingrowth in a direction toward the plate and/or in a direction perpendicular thereto and between the keel structures. Exemplary structures are shown in
Turning to the simplified side view of
Turning to the simplified side view of
Turning to the simplified front view of
Turning to the simplified front view of
Turning to the simplified views of
Fixation to adjacent vertebral bodies may be further enhanced through surface treatment of the plates of the intervertebral implant. For example, the plates may be treated with a titanium plasma spray with HA coating. Additionally, the plates may be roughened in a known manner and treated with a peptide nano coating.
The plates and cores of the intervertebral implant may be constructed of any suitable material, including but limited to metal, polyethylene, PEAKĀ® and ceramic.
Turning to
The forward portion 94 may additionally include a template portion 98 oriented in a plane substantially perpendicular to the spacer portion 96. The template portion 98 may function to both provide a stop for limiting insertion of the spacer portion 96 into the disc space and a template for cutting grooves in the adjacent vertebral bodies to receive keels, pegs or other fixation structure carried by the plates of the intervertebral implant. The template portion 98 may define a structure for forming channels or other openings corresponding in number, position, and shape, including size, to the number, position, and shape of keels carried by a specific intervertebral implant. In one exemplary use, the template portion 98 shown in
In use, the spacer portion 96 is inserted into the disc space and the template portion 98 is positioned adjacent to or substantially adjacent to the vertebral bodies. A cutting tool may be placed over the elongated handle 92 or other guiding structure. The cutting tool may be a chisel or other tool for forming grooves in the adjacent vertebral bodies. The grooves for the keels may be formed simultaneously or one at a time in the vertebral bodies
Turning to
The forward portion 106 may additionally include a template portion 108 oriented in a plane substantially perpendicular to the spacer portion 109. The template portion 108 may function to both provide a stop for limiting insertion of the spacer portion into the disc space and a template for cutting grooves in the adjacent vertebral bodies to receive keels, pegs or other fixation structure carried by the plates of the intervertebral implant. The template portion 108 may define a structure for forming channels corresponding in number, position, and shape to the number, position, and shape of keels carried by a specific implant. In one exemplary use, the template portion 108 shown in
Turning to
Turning to the end view of
During implantation of an artificial disc prosthesis, the natural disc may be removed and the disc space may be distracted. The disc space may be distracted with a series of spacers. The series of spacers may include a series of constant thickness, flat spacers. The flat spacers may be stacked to increase the disc space to a desired height. After a desired height has been obtained, a hollow distraction device may be placed into the disc space to maintain the desired height. The hollow device may define a generally rectangular cavity. The spacers may include a threaded aperture to facilitate insertion and/or removal. Similar distraction may be achieved through insertion of a constant thickness spacer between two opposing plates. Alternately, a series of flat, incrementally sized blocks may be sequentially introduced into the disc space to gradually increase the disc space.
Referring to
The foregoing discussion discloses and describes various features of intervertebral implants, methods for implanting intervertebral implants and instrumentation for implanting intervertebral implants. It will be appreciated that the various features described herein may be used alone or in any combination. Furthermore, it will be appreciated that an intervertebral implant incorporating one or more such features may be implanted with the methods and instrumentation described herein or alternatively with other suitable methods and instrumentation. One skilled in the art will readily recognize from such discussion, and from the accompanying drawings and claims, that various changes, modifications and variations can be made therein without departing from the spirit and scope of the present teachings as defined in the following claims.
This application claims the benefit of U.S. Provisional Application No. 60/830,153 filed on Jul. 11, 2006. The disclosure of the above application is incorporated herein by reference.
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