|Publication number||US20020065560 A1|
|Application number||US 10/055,673|
|Publication date||May 30, 2002|
|Filing date||Jan 22, 2002|
|Priority date||Jun 12, 2000|
|Also published as||EP1294321A1, US6579318, US6852127, US20020065558, US20020077700, US20040186574, US20040186575, US20060212119, WO2001095838A1|
|Publication number||055673, 10055673, US 2002/0065560 A1, US 2002/065560 A1, US 20020065560 A1, US 20020065560A1, US 2002065560 A1, US 2002065560A1, US-A1-20020065560, US-A1-2002065560, US2002/0065560A1, US2002/065560A1, US20020065560 A1, US20020065560A1, US2002065560 A1, US2002065560A1|
|Inventors||Peter Varga, James Ogilvie|
|Original Assignee||Ortho Development Corporation|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (99), Referenced by (35), Classifications (26), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
 Not Applicable.
 Not Applicable.
 1. The Field of the Invention
 The present invention relates generally to an intervertebral spacer, and more particularly, but not necessarily entirely, to a interbody spacing system for accomplishing enhanced intervertebral fusion between adjacent vertebral bodies of a human spine.
 2. Description of Related Art
 The human spine is a complex, sophisticated mechanical system. The vertebrate spine operates as a structural member, providing structural support for the other body parts. A normal human spine is segmented with seven cervical, twelve thoracic and five lumbar segments. The lumbar portion of the spine resides on the sacrum, which is attached to the pelvis. The pelvis is supported by the hips and leg bones. The bony vertebral bodies of the spine are separated by intervertebral discs, which reside sandwiched between the vertebral bodies and operate as joints allowing known degrees of flexion, extension, lateral bending and axial rotation.
 The intervertebral disc primarily serves as a mechanical cushion between adjacent vertebral bodies, and permits controlled motions within vertebral segments of the axial skeleton. The disc is a multi-element system, having three basic components: the nucleus pulposus (“nucleus”), the anulus fibrosus (“anulus”) and two vertebral end plates. The end plates are made of thin cartilage overlying a thin layer of hard, cortical bone that attaches to the spongy, richly vascular, cancellous bone of the vertebral body. The plates thereby operate to attach adjacent vertebrae to the disc. In other words, a transitional zone is created by the end plates between the malleable disc and the bony vertebrae.
 The anulus of the disc forms the disc perimeter, and is a tough, outer fibrous ring that binds adjacent vertebrae together. The fiber layers of the anulus include fifteen to twenty overlapping plies, which are inserted into the superior and inferior vertebral bodies at roughly a 40 degree angle in both directions. This causes bi-directional torsional resistance, as about half of the angulated fibers will tighten when the vertebrae rotate in either direction.
 It is common practice to remove a spinal disc in cases of spinal disc deterioration, disease or spinal injury. The discs sometimes become diseased or damaged such that the intervertebral separation is reduced. Such events cause the height of the disc nucleus to decrease, which in turn causes the anulus to buckle in areas where the laminated plies are loosely bonded. As the overlapping laminated plies of the anulus begin to buckle and separate, either circumferential or radial anular tears may occur. Such disruption to the natural intervertebral separation produces pain, which can be alleviated by removal of the disc and maintenance of the natural separation distance. In cases of chronic back pain resulting from a degenerated or herniated disc, removal of the disc becomes medically necessary.
 In some cases, the damaged disc may be replaced with a disc prosthesis intended to duplicate the function of the natural spinal disc. U.S. Pat. No. 4,863,477 (granted Sep. 5, 1989 to Monson) discloses a resilient spinal disc prosthesis intended to replace the resiliency of a natural human spinal disc. U.S. Pat. No. 5,192,326 (granted Mar. 9, 1993 to Bao et al.) teaches a prosthetic nucleus for replacing just the nucleus portion of a human spinal disc.
 In other cases it is desired to fuse the adjacent vertebrae together after removal of the disc, sometimes referred to as “intervertebral fusion” or “interbody fusion.”
 In cases of intervertebral fusion, it is known to position a spacer centrally within the space where the spinal disc once resided, or to position multiple spacers within that space. Such practices are characterized by certain disadvantages, including a disruption in the natural curvature of the spine. For example, the vertebrae in the lower “lumbar” region of the spine reside in an arch referred to in the medical field as having a sagittal alignment. The sagittal alignment is compromised when adjacent vertebral bodies that were once angled toward each other on their posterior side become fused in a different, less angled orientation relative to one another.
 Another disadvantage of known spacing techniques and intervertebral spacers are the additional surgical complications that arise in the use of multiple spacers in a single disc space. In such cases, surgeons will often first perform a posterior surgery to remove the affected disc and affix posterior instrumentation to the posterior side of the vertebrae to hold the posterior portions of the vertebrae in a desired position. Placement of the multiple spacers is often too difficult to accomplish from the posterior side of the patient, at least without causing with undue trauma to the patient, because a surgeon would need to retract the dura nerve as well as the anterior longitudinal ligament, thereby increasing damage, pain and morbidity to the patient. Surgeons have therefore often chosen to turn the patient over after completing the posterior surgical portion, to perform an anterior operative procedure, through the patient's belly, in order to insert multiple spacers between the vertebrae from the anterior side instead of from the posterior side.
 U.S. Pat. No. 5,961,554 (granted Oct. 5, 1999 to Janson et al.) illustrates a spacer having a high degree of porosity throughout, for enhanced tissue ingrowth characteristics. This patent does not address the problem of compromising the sagittal alignment, or of increased pain and trauma to the patient by implantation of multiple spacers in a single disk space.
 The prior art is thus characterized by several disadvantages that are addressed by the present invention. The present invention minimizes, and in some aspects eliminates, the above-mentioned failures, and other problems, by utilizing the methods and structural features described herein.
 It is therefore an object of the present invention to provide an intervertebral spacing system that does not require an additional, anterior surgical procedure.
 It is another object of the present invention, in accordance with one aspect thereof, to provide such an intervertebral spacing system by which sagittal alignment of the spine is restored.
 It is a further object of the present invention, in accordance with one aspect thereof, to provide such an intervertebral spacing system that can accommodate a larger host-graft interface between adjacent vertebral bodies.
 It is an additional object of the present invention, in accordance with one aspect thereof, to provide such an intervertebral spacing system in which bone grafting material is loaded in compression between adjacent vertebral bodies of the spine.
 It is yet another object of the present invention, in accordance with one aspect thereof, to provide such an intervertebral spacing system that does not require retraction of the dural nerve, or of the anterior or posterior longitudinal ligaments, for implantation of the spacer.
 The above objects and others not specifically recited are realized in a specific illustrative embodiment of an intervertebral spacer adapted for implanting between adjacent vertebral bodies of a human spine as a load-bearing replacement for a spinal disc. The spacing member includes an external, non-porous, concavo-convex contour with respect to one dimension of said spacing member. The spacing member is preferably constructed from a rigid, non-resilient load-bearing material that is incapable of elastic deformation. The spacing member is inserted with the aid of a sheathed trocar device that is releasably attached to the spacer, to enable implantation and selective positioning of the spacer by the surgeon from the posterior side of the spine, without the need to retract the dural nerve or the posterior longitudinal ligament.
 Additional objects and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by the practice of the invention without undue experimentation. The objects and advantages of the invention may be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims.
 The above and other objects, features and advantages of the invention will become apparent from a consideration of the subsequent detailed description presented in connection with the accompanying drawings in which:
FIG. 1 is a perspective view of an intervertebral spacer, made in accordance with the principles of the present invention;
FIG. 2 is a plan view of the intervertebral spacer of FIG. 1;
FIG. 3 is a frontal view of the intervertebral spacer of FIGS. 1 and 2;
FIG. 4 is a side view of the intervertebral spacer of FIGS. 1, 2 and 3;
FIG. 5 is side view of a pair of adjacent vertebral bodies from the lumbar region of a human spine;
FIG. 6 is a schematic view of a sheathed trocar device releasably attached to a trial spacer shaped similarly to the intervertebral spacer of FIG. 1, in accordance with the principles of the present invention;
FIG. 7 is a schematic view of a sheathed trocar device releasably attached to the intervertebral spacer of FIG. 1, in accordance with the principles of the present invention;
 FIGS. 8A-8D illustrate a schematic progression of the placement of the intervertebral spacer of FIG. 1 between vertebral bodies of a human spine; and
FIG. 9 illustrates posterior instrumentation by which compression is applied to the posterior sides of a paid of adjacenet vertebral bodies of a human spine.
 For the purposes of promoting an understanding of the principles in accordance with the invention, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended. Any alterations and further modifications of the inventive features illustrated herein, and any additional applications of the principles of the invention as illustrated herein, which would normally occur to one skilled in the relevant art and having possession of this disclosure, are to be considered within the scope of the invention claimed.
 Before the apparatus and methods of the present invention are described further, it is to be understood that the invention is not limited to the particular configurations, process steps, and materials disclosed herein as such configurations, process steps, and materials may vary somewhat. It is also to be understood that the terminology employed herein is used for the purpose of describing particular embodiments of the invention only, and is not intended to be limiting since the scope of the present invention will be limited only by the appended claims and equivalents thereof.
 The publications and other reference materials referred to herein to describe the background of the invention and to provide additional detail regarding its practice are hereby incorporated by reference. The references discussed herein are provided solely for their disclosure prior to the filing date of the present application. Nothing herein is to be construed as a suggestion or admission that the inventors are not entitled to antedate such disclosure by virtue of prior invention.
 In describing and claiming the present invention, the following terminology will be used in accordance with the definitions set out below.
 As used herein, “comprising,” “including,” “containing,” “characterized by,” and grammatical equivalents thereof are inclusive or open-ended terms that do not exclude additional, unrecited elements or method steps.
 Applicants have discovered that several of the disadvantages of the prior art spinal disc replacement systems can be minimized, or even eliminated, by the use of a cashew-shaped interbody spacer having a tapered external shape, placing it is far anteriorly as possible between adjacent vertebral bodies, filling in the remaining posterior space with bone graft material, and applying compression to posterior portions of the vertebral bodies to load the bone graft in compression and restore sagittal alignment.
 Referring now to FIGS. 1-4, there is shown a spacing member, referred to also herein as an intervertebral spacer or an interbody spacer, designated generally at 10.
 Briefly stated, the spacer 10 is utilized, along with autogenous bone grafting material, to replace a diseased or damaged spinal disc. Referring now to FIGS. 5-7, the procedure is implemented by making an incision 32 in the anulus 34 connecting adjacent vertebral bodies 31. The spinal disc (not shown) is surgically removed from the incision 32, after which the spacer 10 is placed through the incision 32 into position between the vertebral bodies 31. The spacer is preferably placed with its convex, anterior sidewall 12 facing anteriorly, and with its concave, posterior sidewall 14 facing posteriorly. Bone grafting material is placed through the incision 32 to reside behind the spacer 10, after which posterior instrumentation is attached to pedicle areas 34 to force the vertebral bodies 31 together in compression, as illustrated schematically in FIG. 8D and more particularly in FIG. 9.
 The unique aspects and procedures relating to the spacer 10 will now be explained in more detail. Some of the key features of the invention comprise the size, shape and placement of spacer 10. The spacer 10 is preferably made of titanium, thus having a non-porous quality with a preferably smooth finish. The spacer 10 could also be made of ceramic, or any other suitable material that is inert and biologically compatible. The spacer 10 is thus constructed from a rigid, non-resilient load-bearing material, one that is preferably incapable of elastic deformation. The spacer 10, by its anterior, convex sidewall 12 and its posterior, concave sidewall 14, has thereby a concavo-convex contour with respect to one dimension.
 It is to be understood that the concept of an object having a concavo-convex contour with respect to one dimension of the object, as referred to herein, shall not require the concave and convex sides of the object to be parallel to one another, although such is preferred. The concept does however refer to a dimension in which the concave and convex sides of the object are at least partially facing the direction of that dimension, as indicated by the dimension 16 of FIG. 1 in relation to the spacer 10. It is also to be understood that the concept of an object being concavo-convex in a single dimension shall thereby include an object that has concave and convex sides 14 and 12 in a horizontal dimension 16, even though those very same sides are linear in a vertical dimension 20 at all points, such as in the case of the spacer 10 shown in FIG. 1. For example, the spacer 10 is concavo-convex in the anterior-posterior direction 16, though not in a medial-lateral direction 18 or vertical direction 20.
 The upper surface 22 of the spacer 10 is preferably a planer, discontinuous surface having a plurality of spaced-apart elongate recesses 24, with preferably a corner point 28 whereby one side 26 of the spacer 10 begins tapering in the medial-lateral direction 18, as shown most clearly in FIG. 3. The primary taper of the spacer 10 occurs in the anterio-to-posterior direction 16, in that the spacer 10 narrows in thickness in a continuous manner along substantially the entire spacer 10 as shown most clearly in FIG. 4. The upper surface 22 and lower surface 30 form an acute angle relative to a horizontal plane 23, the angle being with a range of preferably two to eight degrees, most preferably four degrees. The entire taper is therefore most preferably an eight degree total taper, with four degrees of taper resulting from the upper surface 22 and the other four degrees of taper resulting from the lower surface 30.
 As shown most clearly in FIG. 2, the spacer 10 has an arc-length AL that is preferably 1.218 inches, a width W that is preferably 0.320 inches, a depth D that is preferably 0.532 inches, an inner radius R2 that is 0.271 inches, an outer radius R1 that is preferably 0.591 inches, and side radii R3 and R4 that are each preferably 0.160 inches.
 The anterior, convex sidewall 12 and the posterior, concave sidewall 14 of the spacer 10 are each preferably linear in the vertical dimension 20, and are most preferably parallel relative to one another.
 The primary goal in intervertebral fusion are immobilization of the affected vertebrae, restoration of the spinal disc space and sagittal alignment, and to provide an environment for bony fusion between vertebral bodies. Applicants have discovered that these goals are most effectively accomplished by the mechanical principle of a cantilever. Using the spacer 10 as a compression point, a cantilever is constructed within the disc space as shown most clearly in FIG. 8D. The procedure for accomplishing this is as follows.
FIG. 8A is a schematic side, internal view of the vertebral bodies 31 indicated in FIG. 5. The spinal disc 33 resides between the vertebral bodies 31, all of which reside between the anterior longitudinal ligament (ALL) 36 and the posterior longitudinal ligament (PLL) 38. The dural nerve (Dura) 40 resides posteriorly to the vertebral bodies 31 and the PLL 38.
 Referring now to FIG. 8B and FIG. 9, posterior access to the spine of the patient (not shown) is accomplished. Posterior instrumentation, preferably pedicle screws 42 (FIG. 9), are affixed to posterior pedicle portions 34 of the vertebral bodies 31. The associated rods 44 and structure interconnecting the rods 44 with the pedicle screws 42 are not affixed until later on in the procedure. A posterior portion of the lower vertebral body involved in the fusion, namely, the left inferior articular facet, is removed and saved for future autogenous bone grafting. A lamina spreader (not shown, but indicated in FIGS. 8B and 8C), is placed between the spinous processes 35 (shown in FIG. 5), and is operated to spread the adjacent vertebral bodies 31 apart. The anterior longitudinal ligament 36 and posterior longitudinal ligament 38 are left intact and need not be retracted.
 After coagulation of the veins (not shown), the incision 32 (FIG. 5) is made, preferably with a #15 scalpel, or any suitable surgical instrument, in a side section of the anulus 37. The disc 33 is then detached from the vertebral end plates (not shown) with the proper surgical instrumentation, and is removed through the incision 32. Care is taken not to violate the bony vertebral end plate, which would cause excessive bleeding and compromise the resistance to axial load when the spacer 10 is inserted.
 When as much disc material has been removed as can safely be accomplished, a trial spacer 50 is used to determine the correct spacer size. The trial spacer 50 preferably has the same shape as the spacer 10, both of which are part of a set having various sizes, except that the trial spacer 50 does not include the recesses 24. The trial spacer 50 is inserted into the incision 32 with a sheathed trocar device 52. The main purpose of trial spacer 50 is to evaluate a snugness of fit of said trial spacer 50 as it resides between the adjacent vertebral bodies 31, which enables the surgeon to determine a spacer size thereby. The trial spacer 50 may also have sharp edging, and is useable to clear away any remaining unwanted tissue.
 When the spacer size has been determined, a bone graft is prepared, preferably autogenous bone graft material 54 as shown in FIG. 8C. Care is taken to remove all soft tissue from the autogenous bone, which will facilitate successful osseointegration of the graft. Additional bone can also be harvested from the spinous processes 35. The harvested autogenous bone is then passed through a bone mill (not shown) to form suitable bone grafting material as known and understood to those having ordinary skill in the art.
 The spacer 10 is inserted through the incision 32 with the sheathed trocar device 52. The sheathed trocar device 52 includes a trocar rod 56 preferably slidably disposed within a hollow sheath 58. The trocar rod 56 and the hollow sheath 58 may moveably engaged with each other in any suitable manner.
 Both the trial spacer 50 and the spacer 10 preferably include a female-threaded opening 50 a and 10 a formed therein, respectively, in which a male-threaded portion 57 of the trocar rod 56 may be releasably inserted. The trocar rod 56 may of course be releasably attached to the trial spacer 50 and spacer 10 in any other suitable manner. The trocar rod 56 has a longer length than the sheath member 58, such that a proximal portion 60 of the trocar rod 56 protrudes from the sheath member 58 when the trocar rod 56 is attached to the trial spacer 50 or the spacer 10.
 The sheathed trocar device 52 accordingly provides an efficiently stabilized, releasable connection with the spacer 10. With the trocar rod 56 being attached directly to the spacer 10, the sheath member 58 provides additional support by abutting up against the spacer and contactably circumscribing the point of the attachment of the trocar rod 56 with the spacer 10, thereby providing additional stability and control over the positioning of the spacer 10.
 The surgeon then selectively positions the spacer 10 within the space residing between the adjacent vertebral bodies 31, preferably as far anteriorly as possible and most preferably such that the spacer 10 resides in contact with the anterior longitudinal ligament 36.
 With the spacer 10 in place, the bone grafting material 54 is placed through the incision 32 and into position between the adjacent vertebral bodies 31, such that said bone grafting material 54 resides posteriorly to the concave sidewall 14 of the spacer 10, and thus between the sidewall 14 and the posterior longitudinal ligament 38. A bone funnel (not shown) as known to those having ordinary skill in the field may be used to funnel morselized bone grafting material into the incision 32.
 It is noted that the concavo-convex shape of the spacer 10, and the method of implantation with the spacer 10 residing as far anteriorly as possible, operates to provide a larger bone-graft interface between the adjacent vertebral bodies 31.
 Referring now to FIG. 8D and FIG. 9, the lamina spreader is removed and the pedicle screws 42 are interconnected with the rods 44 as known in the field. Mild compression is applied by a compression instrument 46 to thereby slide rods 44 downwardly, after which the pedicle screws 42 are tightened to hold the rods 44 in place and maintain the compression. Further compression is applied as desired, with the result being illustrated schematically in FIG. 8D. The bone grafting material 54 is thereby loaded in compression by the posteriorly compressed adjacent vertebral bodies 31 as shown. After final inspection of the placement of the bone grafting material 54, routine closure of the wound is completed. The use of drains may be made at the discretion of the surgeon.
 The spacer 10 thus operates to cause the adjacent vertebral bodies 31 to be suspended in the manner of a cantilever. The posterior compression provided by the pedicle screws 42 and rods 44, which may alternatively be provided by any other suitable holding structure, causes the adjacent vertebral bodies 31 to be brought closer together on their posterior side than on their anterior side, consistent with the natural sagittal alignment in which they were originally positioned, as understood by those having ordinary skill in the field.
 It will be appreciated that the structure and apparatus of the trocar rod 56 and sheath 58 constitute a positioning means for enabling a surgeon to adjust a position of the spacer 10 when the spacer 10 resides between the adjacent intervertebral bodies 31. That structure is merely one example of a means for positioning the spacer 10, and it should be appreciated that any structure, apparatus or system for positioning which performs functions that are the same as, or equivalent to, those disclosed herein are intended to fall within the scope of a means for positioning, including those structures, apparatus or systems for positioning which are presently known, or which may become available in the future. Anything which functions the same as, or equivalently to, a means for positioning falls within the scope of this element.
 In accordance with the features and combinations described above, a preferred method of implanting an artificial intervertebral disc includes:
 (a) making an incision in an anulus of a human spinal column between adjacent vertebral bodies of said spinal column to thereby expose a space residing between said adjacent vertebral bodies;
 (b) inserting a spacing member through the incision and into position between the adjacent vertebral bodies, and positioning said spacing member at an anterior location with respect to the spinal column such that more intervertebral space resides posteriorly to said spacing member than anteriorly thereto;
 (c) applying compression to posterior portions of the adjacent vertebral bodies.
 It is to be understood that the above-described arrangements are only illustrative of the application of the principles of the present invention. Numerous modifications and alternative arrangements may be devised by those skilled in the art without departing from the spirit and scope of the present invention and the appended are intended to cover such modifications and arrangements. Thus, while the present invention has been shown in the drawings and fully described above with particularity and detail in connection with what is presently deemed to be the most practical and preferred embodiment(s) of the invention, it will be apparent to those of ordinary skill in the art that numerous modifications, including, but not limited to, variations in size, materials, shape, form, function and manner of operation, assembly and use may be made without departing from the principles and concepts set forth herein.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US532 *||Dec 26, 1837||Machine for reducing and cutting dye woods and bark|
|US1129 *||Apr 20, 1839||hillyer|
|US4479491 *||Jul 26, 1982||Oct 30, 1984||Martin Felix M||Intervertebral stabilization implant|
|US4627853 *||May 29, 1985||Dec 9, 1986||American Hospital Supply Corporation||Method of producing prostheses for replacement of articular cartilage and prostheses so produced|
|US4678470 *||May 29, 1985||Jul 7, 1987||American Hospital Supply Corporation||Bone-grafting material|
|US4714469 *||Feb 26, 1987||Dec 22, 1987||Pfizer Hospital Products Group, Inc.||Spinal implant|
|US4863477 *||May 12, 1987||Sep 5, 1989||Monson Gary L||Synthetic intervertebral disc prosthesis|
|US4904261 *||Aug 4, 1988||Feb 27, 1990||A. W. Showell (Surgicraft) Limited||Spinal implants|
|US4932969 *||Dec 17, 1987||Jun 12, 1990||Sulzer Brothers Limited||Joint endoprosthesis|
|US4950296 *||Jun 13, 1989||Aug 21, 1990||Mcintyre Jonathan L||Bone grafting units|
|US5053049 *||May 29, 1985||Oct 1, 1991||Baxter International||Flexible prostheses of predetermined shapes and process for making same|
|US5071437 *||Nov 21, 1990||Dec 10, 1991||Acromed Corporation||Artificial disc|
|US5092893 *||Sep 4, 1990||Mar 3, 1992||Smith Thomas E||Human orthopedic vertebra implant|
|US5123926 *||Feb 22, 1991||Jun 23, 1992||Madhavan Pisharodi||Artificial spinal prosthesis|
|US5171281 *||Oct 9, 1991||Dec 15, 1992||University Of Medicine & Dentistry Of New Jersey||Functional and biocompatible intervertebral disc spacer containing elastomeric material of varying hardness|
|US5192326 *||Sep 9, 1991||Mar 9, 1993||Pfizer Hospital Products Group, Inc.||Hydrogel bead intervertebral disc nucleus|
|US5192327 *||Mar 22, 1991||Mar 9, 1993||Brantigan John W||Surgical prosthetic implant for vertebrae|
|US5275954 *||Mar 5, 1991||Jan 4, 1994||Lifenet||Process for demineralization of bone using column extraction|
|US5306303 *||Nov 19, 1991||Apr 26, 1994||The Medical College Of Wisconsin, Inc.||Bone induction method|
|US5306308 *||Oct 23, 1990||Apr 26, 1994||Ulrich Gross||Intervertebral implant|
|US5306309 *||May 4, 1992||Apr 26, 1994||Calcitek, Inc.||Spinal disk implant and implantation kit|
|US5344459 *||Mar 17, 1993||Sep 6, 1994||Swartz Stephen J||Arthroscopically implantable prosthesis|
|US5425772 *||Sep 20, 1993||Jun 20, 1995||Brantigan; John W.||Prosthetic implant for intervertebral spinal fusion|
|US5458638 *||Nov 6, 1992||Oct 17, 1995||Spine-Tech, Inc.||Non-threaded spinal implant|
|US5458643 *||Feb 1, 1994||Oct 17, 1995||Kyocera Corporation||Artificial intervertebral disc|
|US5514180 *||Jan 14, 1994||May 7, 1996||Heggeness; Michael H.||Prosthetic intervertebral devices|
|US5534028 *||Apr 20, 1993||Jul 9, 1996||Howmedica, Inc.||Hydrogel intervertebral disc nucleus with diminished lateral bulging|
|US5534030 *||Apr 25, 1994||Jul 9, 1996||Acromed Corporation||Spine disc|
|US5545229 *||Jul 28, 1993||Aug 13, 1996||University Of Medicine And Dentistry Of Nj||Functional and biocompatible intervertebral disc spacer containing elastomeric material of varying hardness|
|US5571192 *||Jul 3, 1995||Nov 5, 1996||Heinrich Ulrich||Prosthetic vertebral implant|
|US5593409 *||Feb 17, 1995||Jan 14, 1997||Sofamor Danek Group, Inc.||Interbody spinal fusion implants|
|US5609637 *||Apr 17, 1996||Mar 11, 1997||Biedermann; Lutz||Space keeper, in particular for an intervertebral disk|
|US5653762 *||Jun 7, 1995||Aug 5, 1997||Pisharodi; Madhavan||Method of stabilizing adjacent vertebrae with rotating, lockable, middle-expanded intervertebral disk stabilizer|
|US5658337 *||Apr 17, 1996||Aug 19, 1997||Spine-Tech, Inc.||Intervertebral fusion implant|
|US5674295 *||Apr 26, 1996||Oct 7, 1997||Raymedica, Inc.||Prosthetic spinal disc nucleus|
|US5702449 *||Jun 7, 1995||Dec 30, 1997||Danek Medical, Inc.||Reinforced porous spinal implants|
|US5702451 *||Dec 29, 1995||Dec 30, 1997||Biedermann; Lutz||Space holder, in particular for a vertebra or an intervertebral disk|
|US5722977 *||Jan 24, 1996||Mar 3, 1998||Danek Medical, Inc.||Method and means for anterior lumbar exact cut with quadrilateral osteotome and precision guide/spacer|
|US5725579 *||Dec 6, 1995||Mar 10, 1998||Bioland||Process for treating bone tissue and corresponding implantable biomaterials|
|US5728159 *||Jan 2, 1997||Mar 17, 1998||Musculoskeletal Transplant Foundation||Serrated bone graft|
|US5741253 *||Oct 29, 1992||Apr 21, 1998||Michelson; Gary Karlin||Method for inserting spinal implants|
|US5755798 *||Oct 25, 1996||May 26, 1998||Artos Medizinische Produkte Gmbh||Intervertebral implant|
|US5766252 *||Jan 24, 1995||Jun 16, 1998||Osteonics Corp.||Interbody spinal prosthetic implant and method|
|US5766253 *||Jan 16, 1996||Jun 16, 1998||Surgical Dynamics, Inc.||Spinal fusion device|
|US5767702 *||Jun 7, 1996||Jun 16, 1998||Kabushiki Kaisha Toshiba||Switched pull down emitter coupled logic circuits|
|US5776199 *||May 2, 1997||Jul 7, 1998||Sofamor Danek Properties||Artificial spinal fusion implants|
|US5785710 *||Jun 7, 1995||Jul 28, 1998||Sofamor Danek Group, Inc.||Interbody spinal fusion implants|
|US5797871 *||May 7, 1996||Aug 25, 1998||Lifenet Research Foundation||Ultrasonic cleaning of allograft bone|
|US5814084 *||Jan 16, 1996||Sep 29, 1998||University Of Florida Tissue Bank, Inc.||Diaphysial cortical dowel|
|US5820581 *||Mar 21, 1996||Oct 13, 1998||Lifenet Research Foundation||Process for cleaning large bone grafts and bone grafts produced thereby|
|US5824094 *||Oct 17, 1997||Oct 20, 1998||Acromed Corporation||Spinal disc|
|US5856545 *||Dec 5, 1997||Jan 5, 1999||Dow Corning Toray Silicone Co., Ltd.||Method for preparation of organopentasiloxane|
|US5860973 *||Oct 30, 1996||Jan 19, 1999||Michelson; Gary Karlin||Translateral spinal implant|
|US5861041 *||Apr 7, 1997||Jan 19, 1999||Arthit Sitiso||Intervertebral disk prosthesis and method of making the same|
|US5876457 *||May 20, 1997||Mar 2, 1999||George J. Picha||Spinal implant|
|US5888222 *||Oct 9, 1997||Mar 30, 1999||Sdgi Holding, Inc.||Intervertebral spacers|
|US5888223 *||Jun 9, 1998||Mar 30, 1999||Bray, Jr.; Robert S.||Anterior stabilization device|
|US5888224 *||Sep 5, 1997||Mar 30, 1999||Synthesis (U.S.A.)||Implant for intervertebral space|
|US5888226 *||Nov 12, 1997||Mar 30, 1999||Rogozinski; Chaim||Intervertebral prosthetic disc|
|US5888227 *||Oct 3, 1996||Mar 30, 1999||Synthes (U.S.A.)||Inter-vertebral implant|
|US5888228 *||Oct 20, 1995||Mar 30, 1999||Synthes (U.S.A.)||Intervertebral implant with cage and rotating element|
|US5897556 *||Jun 2, 1997||Apr 27, 1999||Sdgi Holdings, Inc.||Device for supporting weak bony structures|
|US5897593 *||Jul 29, 1997||Apr 27, 1999||Sulzer Spine-Tech Inc.||Lordotic spinal implant|
|US5961554 *||Dec 31, 1996||Oct 5, 1999||Janson; Frank S||Intervertebral spacer|
|US5972368 *||Jun 11, 1997||Oct 26, 1999||Sdgi Holdings, Inc.||Bone graft composites and spacers|
|US5989289 *||Oct 9, 1997||Nov 23, 1999||Sdgi Holdings, Inc.||Bone grafts|
|US6022376 *||Mar 16, 1998||Feb 8, 2000||Raymedica, Inc.||Percutaneous prosthetic spinal disc nucleus and method of manufacture|
|US6045580 *||Oct 9, 1998||Apr 4, 2000||Osteotech, Inc.||Fusion implant device and method of use|
|US6059829 *||Mar 8, 1995||May 9, 2000||Synthese||Intervertebral implant|
|US6080168 *||Aug 28, 1997||Jun 27, 2000||Levin; John M.||Compression pad for laparoscopic/thorascopic surgery|
|US6093205 *||Jun 25, 1998||Jul 25, 2000||Bridport-Gundry Plc C/O Pearsalls Implants||Surgical implant|
|US6096081 *||Jan 16, 1997||Aug 1, 2000||University Of Florida Tissue Bank, Inc.||Diaphysial cortical dowel|
|US6117174 *||Sep 16, 1998||Sep 12, 2000||Nolan; Wesley A.||Spinal implant device|
|US6132465 *||Jun 4, 1998||Oct 17, 2000||Raymedica, Inc.||Tapered prosthetic spinal disc nucleus|
|US6139579 *||Oct 31, 1997||Oct 31, 2000||Depuy Motech Acromed, Inc.||Spinal disc|
|US6143031 *||Oct 20, 1995||Nov 7, 2000||Synthes (U.S.A.)||Intervertebral implant with compressible shaped hollow element|
|US6143032 *||Nov 12, 1998||Nov 7, 2000||Schafer Micomed Gmbh||Intervertebral implant|
|US6143033 *||Dec 23, 1998||Nov 7, 2000||Synthes (Usa)||Allogenic intervertebral implant|
|US6146422 *||Jan 25, 1999||Nov 14, 2000||Lawson; Kevin Jon||Prosthetic nucleus replacement for surgical reconstruction of intervertebral discs and treatment method|
|US6149651 *||Mar 11, 1999||Nov 21, 2000||Sdgi Holdings, Inc.||Device for supporting weak bony structures|
|US6174311 *||Oct 28, 1998||Jan 16, 2001||Sdgi Holdings, Inc.||Interbody fusion grafts and instrumentation|
|US6179874 *||Apr 23, 1999||Jan 30, 2001||Cauthen Research Group, Inc.||Articulating spinal implant|
|US6210412 *||Jun 7, 1995||Apr 3, 2001||Gary Karlin Michelson||Method for inserting frusto-conical interbody spinal fusion implants|
|US6217579 *||Nov 8, 1999||Apr 17, 2001||Tibor Koros||Expandable spinal implants|
|US6235059 *||Apr 2, 1997||May 22, 2001||Scient'x (Societe A Responsabilite Limitee)||Intersomatic setting and fusion system|
|US6245072 *||Mar 9, 1999||Jun 12, 2001||Sdgi Holdings, Inc.||Methods and instruments for interbody fusion|
|US6245108 *||Jan 31, 2000||Jun 12, 2001||Spineco||Spinal fusion implant|
|US6261586 *||Aug 31, 1999||Jul 17, 2001||Sdgi Holdings, Inc.||Bone graft composites and spacers|
|US6264655 *||Aug 1, 1997||Jul 24, 2001||Madhavan Pisharodi||Cervical disk and spinal stabilizer|
|US6264656 *||May 8, 1998||Jul 24, 2001||Gary Karlin Michelson||Threaded spinal implant|
|US6277149 *||Jun 8, 1999||Aug 21, 2001||Osteotech, Inc.||Ramp-shaped intervertebral implant|
|US6296641 *||Apr 3, 1998||Oct 2, 2001||Bionx Implants Oy||Anatomical fixation implant|
|US6296647 *||Aug 6, 1999||Oct 2, 2001||Stryker Trauma Gmbh||Instrument for the positioning of an implant in the human spine|
|US6302914 *||Mar 10, 1997||Oct 16, 2001||Gary Karlin Michelson||Lordotic interbody spinal fusion implants|
|US6306170 *||Feb 22, 2001||Oct 23, 2001||Tegementa, L.L.C.||Threaded fusion cage anchoring device and method|
|US6309421 *||Apr 13, 1999||Oct 30, 2001||Madhavan Pisharodi||Rotating, locking intervertebral disk stabilizer and applicator|
|US6315795 *||Apr 3, 2000||Nov 13, 2001||Osteotech, Inc.||Fusion implant device and method of use|
|US6315797 *||Jul 20, 2000||Nov 13, 2001||Surgical Dynamics, Inc.||Artificial intervertebral disc|
|US20030074081 *||Jul 19, 2002||Apr 17, 2003||Ayers Reed A.||Non-uniform porosity tissue implant|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US6719794||May 3, 2001||Apr 13, 2004||Synthes (U.S.A.)||Intervertebral implant for transforaminal posterior lumbar interbody fusion procedure|
|US7575580||Apr 15, 2005||Aug 18, 2009||Warsaw Orthopedic, Inc.||Instruments, implants and methods for positioning implants into a spinal disc space|
|US7699877||Aug 5, 2004||Apr 20, 2010||Zimmer Spine, Inc.||Method of securing vertebrae|
|US7722530||Oct 15, 2003||May 25, 2010||Zimmer Spine, Inc.||Method of securing vertebrae|
|US7776049 *||Oct 2, 2002||Aug 17, 2010||Nuvasive, Inc.||Spinal implant inserter, implant, and method|
|US7837732 *||Nov 19, 2004||Nov 23, 2010||Warsaw Orthopedic, Inc.||Intervertebral body fusion cage with keels and implantation methods|
|US7850695||Aug 12, 2004||Dec 14, 2010||Zimmer Spine, Inc.||Method of securing vertebrae|
|US7976550||Aug 9, 2007||Jul 12, 2011||Pioneer Surgical Technology||Insertion instrument for artificial discs|
|US7998212||Sep 26, 2006||Aug 16, 2011||Warsaw Orthopedic, Inc.||Transforaminal hybrid implant|
|US8002837||May 18, 2007||Aug 23, 2011||Pioneer Surgical Technology||Spinal stabilization device and methods|
|US8114160 *||Dec 21, 2007||Feb 14, 2012||Pioneer Surgical Technology, Inc.||Implant retention device and method|
|US8118872||Aug 9, 2007||Feb 21, 2012||Pioneer Surgical Technology, Inc.||System and methods for inserting a spinal disc device into an intervertebral space|
|US8216317||Jul 10, 2012||Stryker Spine||Spinal implant apparatus and methods|
|US8231633||Mar 20, 2009||Jul 31, 2012||Warsaw Orthopedic||Instruments, implants and methods for positioning implants into a spinal disc space|
|US8372084||Sep 24, 2007||Feb 12, 2013||Pioneer Surgical Technology, Inc.||System and methods for inserting a spinal disc device into an intervertebral space|
|US8409213||Mar 18, 2010||Apr 2, 2013||Pioneer Surgical Technology, Inc.||Insertion instrument for artificial discs|
|US8414616||Sep 12, 2007||Apr 9, 2013||Pioneer Surgical Technology, Inc.||Mounting devices for fixation devices and insertion instruments used therewith|
|US8425529||Sep 30, 2010||Apr 23, 2013||Stryker Spine||Instrument for inserting surgical implant with guiding rail|
|US8540725||Jun 22, 2012||Sep 24, 2013||Roy Lim||Instruments, implants and methods for positioning implants into a spinal disc space|
|US8603175||Sep 30, 2010||Dec 10, 2013||Stryker Spine||Method of inserting surgical implant with guiding rail|
|US8690926||Jun 8, 2012||Apr 8, 2014||Stryker Spine||Spinal implant apparatus and methods|
|US8858637||Sep 30, 2010||Oct 14, 2014||Stryker Spine||Surgical implant with guiding rail|
|US9028553||Nov 5, 2009||May 12, 2015||DePuy Synthes Products, Inc.||Self-pivoting spinal implant and associated instrumentation|
|US9060874||Mar 6, 2014||Jun 23, 2015||Stryker Spine||Spinal implant apparatus and methods|
|US9101353||Sep 15, 2004||Aug 11, 2015||Zimmer Spine, Inc.||Method of securing vertebrae|
|US9101493||Feb 17, 2012||Aug 11, 2015||Pioneer Surgical Technology, Inc.||System and methods for inserting a spinal disc device into an intervertebral space|
|US20040167538 *||Feb 26, 2004||Aug 26, 2004||Synthes (U.S.A.)||Method of performing a transforaminal posterior lumbar interbody fusion procedure|
|US20040172133 *||Feb 26, 2004||Sep 2, 2004||Synthes(U.S.A.)||Intervertebral Implant for transforaminal posterior lumbar interbody fusion procedure|
|US20040176853 *||Mar 5, 2003||Sep 9, 2004||Sennett Andrew R.||Apparatus and method for spinal fusion using posteriorly implanted devices|
|US20050038511 *||Aug 5, 2004||Feb 17, 2005||Martz Erik O.||Transforaminal lumbar interbody fusion (TLIF) implant, surgical procedure and instruments for insertion of spinal implant in a spinal disc space|
|US20050149193 *||Nov 19, 2004||Jul 7, 2005||St. Francis Medical Technology, Inc.||Intervertebral body fusion cage with keels and implantation methods|
|US20100198354 *||Jul 30, 2008||Aug 5, 2010||Jeffrey Halbrecht||Method and system for patella tendon realignment|
|US20120310287 *||Dec 6, 2012||Pioneer Surgical Technology, Inc.||Artificial Disc Device|
|WO2004037074A2 *||Oct 24, 2003||May 6, 2004||Endius Inc||Method of securing vertebrae|
|WO2004078070A2 *||Mar 5, 2004||Sep 16, 2004||Cortek Inc||Apparatus and method for spinal fusion using posteriorly implanted devices|
|U.S. Classification||623/17.16, 623/17.11|
|International Classification||A61F2/44, A61F2/00, A61F2/28, A61F2/30, A61F2/46|
|Cooperative Classification||Y10S623/908, A61F2002/30133, A61F2/442, A61F2002/2835, A61F2/4611, A61F2310/00023, A61F2002/4627, A61F2/4465, A61F2230/0015, A61F2002/30828, A61F2/28, A61F2310/00179, A61F2/4684, A61F2002/30774|
|European Classification||A61F2/46T, A61F2/44F4, A61F2/46B7, A61F2/28, A61F2/44D|
|Jan 22, 2002||AS||Assignment|
Owner name: ORTHO DEVELOPMENT CORPORATION, UTAH
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:VARGA, PETER PAL, M.D.;OGILVIE, JAMES A. M.D.;REEL/FRAME:012523/0670;SIGNING DATES FROM 20000728 TO 20001211