US20040230307A1 - Device for fusing two bone segments - Google Patents
Device for fusing two bone segments Download PDFInfo
- Publication number
- US20040230307A1 US20040230307A1 US10/776,754 US77675404A US2004230307A1 US 20040230307 A1 US20040230307 A1 US 20040230307A1 US 77675404 A US77675404 A US 77675404A US 2004230307 A1 US2004230307 A1 US 2004230307A1
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- United States
- Prior art keywords
- plate
- prosthetic device
- extending
- transverse
- additional
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- A61F2/4611—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of spinal prostheses
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Definitions
- the present disclosure relates generally to the field of orthopedics and spinal surgery, and in some embodiments, the present disclosure relates to fusion-promoting prosthetic devices for insertion into an intervertebral disc space.
- anterior plating is often used in conjunction with fusion devices to supplement the stability provided by such fusion devices.
- anterior plating is inappropriate for use due to the presence of vascular structure, which impedes the implantation and positioning of the anterior plating.
- a fusion-promoting prosthetic device for insertion into an intervertebral space includes a sagitally-extending plate having caudal and cephalad edges, the caudal edge being adapted for complete insertion within a first vertebral body and the cephalad edge being adapted for complete insertion within a second vertebral body adjacent to the first vertebral body.
- the prosthetic device further includes a first transverse plate connected to the sagitally-extending plate, and a second transverse plate connected to the sagitally-extending plate, the first and second transverse plates being adapted for complete insertion within the intervertebral space.
- a fusion-promoting, spinal plating assembly includes a first plate adapted to engage a first vertebral body and a second vertebral body, and at least one additional plate connected to the first plate, the at least one additional plate extending transversely to the first plate, wherein the at least one additional plate is adapted to be inserted within an intervertebral space.
- a method for promoting fusion in an intervertebral space defined between first and second vertebral bodies includes providing a prosthetic device having a first plate adapted to engage each of the first and second vertebral bodies, and a pair of additional plates connected to the first plate, the additional pair of plates extending in a direction transverse to the first plate.
- the method further includes inserting the prosthetic device into the intervertebral space such that a first edge of the first plate is completely inserted within the first vertebral body, a second edge of the first plate is completely inserted within the second vertebral body, and each of the additional pair of plates are completely disposed within the intervertebral space.
- FIG. 1 is a lateral view of a pair of adjacent vertebral bodies.
- FIG. 2 is a lateral view of a prosthetic device for insertion between the adjacent vertebral bodies of FIG. 1.
- FIG. 3 a is a longitudinal view of the prosthetic device of FIG. 2.
- FIG. 3 b is a longitudinal view of an alternative prosthetic device.
- FIG. 4 a is a longitudinal view of a pair of the verterbral bodies of FIG. 1 having longitudinally-formed slots for receiving the prosthetic device of FIG. 2.
- FIG. 4 b is a lateral view of the prosthetic device of FIG. 2 shown longitudinally disposed between the vertebral endplates of FIG. 1.
- FIG. 5 a is a lateral view of a pair of verterbral bodies having laterally-formed slots for receiving a prosthetic device.
- FIG. 5 b is a lateral view of an alternative prosthetic device shown laterally disposed between the vertebral bodies of FIG. 5 a.
- FIG. 1 shown therein is a lateral view of a portion of a spinal column 10 , illustrating a pair of adjacent upper and lower vertebrae V 1 and V 2 , respectively, separated by an intervertebral space S created by the removal of a natural intervertebral disc.
- the illustration of two vertebrae is only intended as an example. Another example would be a sacrum and one vertebrae.
- Vascular structure 12 such as, for example, the aortic artery and associated segmental arteries, is shown disposed anteriorly adjacent to the upper and lower vertebrae V 1 , V 2 .
- a prosthetic device for insertion into the space S is generally referred to by reference numeral 20 .
- the device 20 includes a sagittally-extending support plate 22 and a pair of additional support plates 24 , 26 integrally formed with and extending generally transverse to the sagittal plate. It is understood that the transverse plates 24 , 26 may alternatively be removably connected to the sagittal plate 22 such that the prosthetic device 20 is generally modular in nature.
- the sagittal plate 22 and the transverse plates 24 , 26 of the prosthetic device 20 may be formed from a wide variety of materials
- the sagittal plate 22 and the transverse plates 24 , 26 are formed of a cobalt-chrome-molybdenum metallic alloy (ASTM F-799 or F-75).
- ASTM F-799 or F-75 cobalt-chrome-molybdenum metallic alloy
- the sagittal plate 22 and the transverse plates 24 , 26 may be formed of other materials such as titanium or stainless steel, a polymeric material such as polyethylene, or any other biocompatible material that would be apparent to one of ordinary skill in the art.
- the sagittal plate 22 is adapted to engage the upper and lower vertebrae V 1 , V 2 , respectively, and in the present example, the sagittal plate 22 extends in a plane substantially parallel to the sagittal plane (represented by axis Y lying in the sagittal plane in FIG. 1) when engaged with the upper and lower vertebrae.
- the sagittal plate 22 includes an anterior edge 30 , a posterior edge 32 , a caudal edge 34 and a cephalad edge 36 .
- the caudal and cephalad edges 34 , 36 of the sagittal plate 22 are formed as keel-like structures, which aid in the insertion of the prosthetic device 20 into the intervertebral space S.
- the caudal edge 34 of the sagittal plate 22 is beveled at the posterior portion thereof to provide a sharp, forward edge 38 with which to pierce the vertebral body V 2 upon insertion of the prosthetic device 20 .
- the cephalad edge 36 of the sagittal plate 22 is beveled at the posterior portion thereof to provide a sharp, forward edge 39 with which to pierce the vertebral body V 1 upon insertion of the prosthetic device 20 .
- the caudal and cephalad edges 34 , 36 may be angled along the entire surface thereof to aid in the circumvention of vascular structure 12 , or other obstacles, that may be in place during insertion of the prosthetic device 20 .
- the caudal and cephalad edges 34 , 36 may be angled, tapered, or configured in some other shape to facilitate the functional demands of insertion.
- the caudal and cephalad edges 34 , 36 may be configured as having winged portions, including a transverse portion 34 a , 36 a extending across each edge 34 , 36 , respectively.
- the sagittal plate 22 is adapted to promote fusion between the vertebral bodies V 1 , V 2 (FIG. 1), and as such, in one embodiment, a plurality of openings 40 are defined through the sagittal plate to promote fusion therethrough. It should be understood that any number of openings 40 may be defined through the sagittal plate 22 , including a single opening or two or more openings. It should also be understood that the openings 40 need not necessarily extend entirely through the sagittal plate 22 , but may alternatively extend partially therethrough. It should further be understood that the sagittal plate 22 need not necessarily define any openings 40 extending either partially or entirely therethrough. Additionally, although the openings 40 are illustrated as having a circular configuration, it should be understood that other sizes and configurations of the openings 40 are also contemplated.
- the sagittal plate 22 is preferably coated with a bone-growth promoting substance, such as, for example, a hydroxyapatite coating formed of calcium phosphate. Additionally, the sagittal plate 22 may be roughened prior to being coated with the bone-growth promoting substance to further enhance bone on-growth. Such surface roughening may be accomplished by way of, for example, acid etching, knurling, application of a bead coating, or other methods of roughening that would occur to one of ordinary skill in the art.
- a bone-growth promoting substance such as, for example, a hydroxyapatite coating formed of calcium phosphate.
- the sagittal plate 22 may be roughened prior to being coated with the bone-growth promoting substance to further enhance bone on-growth.
- Such surface roughening may be accomplished by way of, for example, acid etching, knurling, application of a bead coating, or other methods of roughening that would occur to one of ordinary skill in the art.
- the sagittal plate 22 may include one or more notches (not shown) or other types of indicia for receiving or engaging with a corresponding portion of a surgical instrument (not shown) to aid in the manipulation and insertion of the prosthetic device 20 within the intervertebral space S (FIG. 1) between the adjacent vertebral bodies V 1 , V 2 (FIG. 1).
- the surgical instrument (not shown) is preferably configured to release the sagittal plate 22 once properly positioned between the adjacent vertebrae.
- a surgical instrument that can be used to insert the prosthetic device 20 is described in co-pending application U.S. Ser. No. 10/430,473.
- the transverse plates 24 , 26 are adapted to engage the vertebral bodies V 1 , V 2 via a pair of bearing surfaces 42 , 44 , respectively.
- the transverse plates 24 , 26 angle towards one another in the posterior direction to accommodate an angular relationship ⁇ defined between the upper and lower vertebrae V 1 , V 2 .
- the angular relationship between the vertebral bodies V 1 , V 2 will vary depending on the particular region of the spine such as the thoracic and lumbar regions.
- the transverse plates 24 , 26 may extend across the sagittal plate 22 at a variety of angles relative to the sagittal plate, including at right angles.
- the transverse plates 24 , 26 are adapted to promote fusion between the vertebral bodies V 1 , V 2 , and as such, a plurality of openings 50 are defined through each of the transverse plates to promote fusion therethrough. It should be understood that any number of openings 50 may be defined through the transverse plates 24 , 26 , including a single opening or two or more openings. It should also be understood that the openings 50 need not necessarily extend entirely through the transverse plates 24 , 26 , but may alternatively extend partially therethrough. It should further be understood that the transverse plates 24 , 26 need not necessarily define any openings 50 extending either partially or entirely therethrough. Additionally, although the openings 50 are illustrated as having a circular configuration, it should be understood that other sizes and configurations of the openings 50 are also contemplated.
- the transverse plates 24 , 26 are preferably coated with a bone-growth promoting substance, such as, for example, a hydroxyapatite coating formed of calcium phosphate. Additionally, the transverse plates 24 , 26 may be roughened prior to being coated with the bone-growth promoting substance to further enhance bone on-growth. Such surface roughening may be accomplished by way of, for example, acid etching, knurling, application of a bead coating, or other methods of roughening that would occur to one of ordinary skill in the art.
- a bone-growth promoting substance such as, for example, a hydroxyapatite coating formed of calcium phosphate.
- the transverse plates 24 , 26 may be roughened prior to being coated with the bone-growth promoting substance to further enhance bone on-growth. Such surface roughening may be accomplished by way of, for example, acid etching, knurling, application of a bead coating, or other methods of roughening that would occur to one of ordinary skill in the art.
- the prosthetic device 20 may be inserted into the space S between the vertebrae V 1 , V 2 from a variety of approaches.
- the vertebral bodies V 1 , V 2 can be prepared to accept the prosthetic device therebetween from an offset longitudinal, or anterior-oblique, approach.
- elongate openings or slots 60 , 62 may be formed in the vertebral endplates of the upper and lower vertebrae V 1 , V 2 , respectively, at a predetermined width and to a predetermined depth.
- the slots 60 , 62 can be substantially aligned with each other to accommodate the sagittal plate 22 , and more specifically, to accommodate the caudal and cephalad edges 34 , 36 defined on the sagittal plate.
- the elongate slots 60 , 62 are rectangular-shaped and are formed by chiseling or curetting.
- other methods of forming the slots 60 , 62 are also contemplated as would occur to one of ordinary skill in the art, such as, for example, by drilling or reaming.
- the caudal and cephalad edges 34 , 36 can form their own corresponding slots by engagement and impaction of the beveled edges 38 , 39 with the vertebrae V 1 , V 2 , and thus no preformed slots are necessary.
- the prosthetic device 20 upon insertion into the intervertebral space S defined between the vertebrae V 1 , V 2 , the prosthetic device 20 is completely disposed within the intervertebral space S such that no portion of the prosthetic device extends beyond the anterior or posterior portion of the vertebrae V 1 , V 2 . Moreover, no plating external of the intervertebral space S is required upon insertion of the prosthetic device 20 , which is advantageous in avoiding the problems associated with contacting the vascular structure 12 .
- the disposition of the prosthetic device 20 in the intervertebral space S results in a relatively large graft area between the vertebrae V 1 , V 2 , the graft area being defined, in one embodiment, by that portion of the intervertebral space S not occupied by the prosthetic device 20 .
- bone grafts may be inserted into the graft area between the vertebrae V 1 , V 2 to encourage fusion between the vertebrae.
- supplemental screws may be impacted into the vertebrae V 1 , V 2 to provide additional support.
- Such screws can be press-fit completely into the vertebrae V 1 , V 2 such that no portion of the screws extends beyond the anterior or posterior portion of the vertebrae V 1 , V 2 .
- a prosthetic device 70 may be laterally inserted into an intervertebral space S′ defined between an upper vertebra V 1 ′ and a lower vertebra V 2 ′.
- the upper and lower vertebrae V 1 ′, V 2 ′ are substantially parallel to one another, and as such, the prosthetic device 70 includes a pair of transverse plates 72 , 74 , which are substantially parallel to one another and are substantially perpendicular to an associated sagittal plate 76 .
- the vertebral bodies V 1 ⁇ , V 2 ′ can be prepared to accept the prosthetic device therebetween from the lateral approach by laterally forming elongate openings or slots 78 , 80 in the vertebral endplates of the upper and lower vertebrae V 1 ′, V 2 ′, respectively, at a predetermined width and to a predetermined depth.
- the slots 78 , 80 can be substantially aligned with each other to accommodate the sagittal plate 76 .
- the elongate slots 78 , 80 are rectangular-shaped and are formed by chiseling or curetting.
- the slots 78 , 80 are also contemplated as would occur to one of ordinary skill in the art, such as, for example, by drilling or reaming.
- the prosthetic device 70 may be configured to form their own corresponding slots by engagement and impaction with the vertebrae V 1 , V 2 , and thus no preformed slots are necessary.
Abstract
Description
- This application claims the benefit of U.S. Provisional Application No. 60/446,963 filed on Feb. 12, 2003. U.S. Provisional Application No. 60/446,963 is herein incorporated by reference for all legitimate purposes. This application is a continuation of U.S. patent application Ser. No. ______ (Attorney Docket No. 31132.44), entitled “Device For Fusing Two Bone Segments” (Inventor: Lukas Eisermann) filed on Jan. 7, 2004. U.S. patent application Ser. No. ______ (Attorney Docket No. 31132.44) is herein incorporated by reference for all legitimate purposes. This application is also related to U.S. patent application Ser. No. 10/430,473, which is herein incorporated by reference for all legitimate purposes.
- The present disclosure relates generally to the field of orthopedics and spinal surgery, and in some embodiments, the present disclosure relates to fusion-promoting prosthetic devices for insertion into an intervertebral disc space.
- In the treatment of diseases, injuries or malformations affecting spinal motion segments, and especially those affecting disc tissue, it has long been known to remove some or all of a degenerated, ruptured or otherwise failing disc. In cases involving intervertebral disc tissue that has been removed or is otherwise absent from a spinal motion segment, corrective measures are taken to ensure the proper spacing of the vertebrae formerly separated by the removed disc tissue. In some instances, fusion-promoting prosthetic devices, such as fusion cages and the like, are inserted into the disc space to maintain the structural integrity of the spinal column.
- Anterior plating is often used in conjunction with fusion devices to supplement the stability provided by such fusion devices. However, in some instances, anterior plating is inappropriate for use due to the presence of vascular structure, which impedes the implantation and positioning of the anterior plating.
- Therefore, what is needed is an implantable fusion device which eliminates, or at least reduces, the need for supplemental plating external of the intervertebral space.
- A fusion-promoting prosthetic device for insertion into an intervertebral space is described. The prosthetic device includes a sagitally-extending plate having caudal and cephalad edges, the caudal edge being adapted for complete insertion within a first vertebral body and the cephalad edge being adapted for complete insertion within a second vertebral body adjacent to the first vertebral body. The prosthetic device further includes a first transverse plate connected to the sagitally-extending plate, and a second transverse plate connected to the sagitally-extending plate, the first and second transverse plates being adapted for complete insertion within the intervertebral space.
- A fusion-promoting, spinal plating assembly is described. The plating assembly includes a first plate adapted to engage a first vertebral body and a second vertebral body, and at least one additional plate connected to the first plate, the at least one additional plate extending transversely to the first plate, wherein the at least one additional plate is adapted to be inserted within an intervertebral space.
- A method for promoting fusion in an intervertebral space defined between first and second vertebral bodies is described. The method includes providing a prosthetic device having a first plate adapted to engage each of the first and second vertebral bodies, and a pair of additional plates connected to the first plate, the additional pair of plates extending in a direction transverse to the first plate. The method further includes inserting the prosthetic device into the intervertebral space such that a first edge of the first plate is completely inserted within the first vertebral body, a second edge of the first plate is completely inserted within the second vertebral body, and each of the additional pair of plates are completely disposed within the intervertebral space.
- FIG. 1 is a lateral view of a pair of adjacent vertebral bodies.
- FIG. 2 is a lateral view of a prosthetic device for insertion between the adjacent vertebral bodies of FIG. 1.
- FIG. 3a is a longitudinal view of the prosthetic device of FIG. 2.
- FIG. 3b is a longitudinal view of an alternative prosthetic device.
- FIG. 4a is a longitudinal view of a pair of the verterbral bodies of FIG. 1 having longitudinally-formed slots for receiving the prosthetic device of FIG. 2.
- FIG. 4b is a lateral view of the prosthetic device of FIG. 2 shown longitudinally disposed between the vertebral endplates of FIG. 1.
- FIG. 5a is a lateral view of a pair of verterbral bodies having laterally-formed slots for receiving a prosthetic device.
- FIG. 5b is a lateral view of an alternative prosthetic device shown laterally disposed between the vertebral bodies of FIG. 5a.
- For the purposes of promoting an understanding of the principles of the disclosure, reference will now be made to the embodiments, or examples, 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 disclosure is thereby intended. Any alterations and further modifications in the described embodiments, and any further applications of the principles of the disclosure as described herein are contemplated as would normally occur to one skilled in the art to which this disclosure relates.
- Referring now to FIG. 1, shown therein is a lateral view of a portion of a spinal column10, illustrating a pair of adjacent upper and lower vertebrae V1 and V2, respectively, separated by an intervertebral space S created by the removal of a natural intervertebral disc. The illustration of two vertebrae is only intended as an example. Another example would be a sacrum and one vertebrae.
Vascular structure 12, such as, for example, the aortic artery and associated segmental arteries, is shown disposed anteriorly adjacent to the upper and lower vertebrae V1, V2. As can be appreciated, it is not desirable to impart pressure to, or otherwise contact, thevascular structure 12 during insertion and upon implantation of a prosthetic device. - Referring now to FIGS. 2 and 3a, a prosthetic device for insertion into the space S (FIG. 1) is generally referred to by
reference numeral 20. In one embodiment, thedevice 20 includes a sagittally-extendingsupport plate 22 and a pair ofadditional support plates transverse plates sagittal plate 22 such that theprosthetic device 20 is generally modular in nature. Although thesagittal plate 22 and thetransverse plates prosthetic device 20 may be formed from a wide variety of materials, in one embodiment of the disclosure, thesagittal plate 22 and thetransverse plates sagittal plate 22 and thetransverse plates - The
sagittal plate 22 is adapted to engage the upper and lower vertebrae V1, V2, respectively, and in the present example, thesagittal plate 22 extends in a plane substantially parallel to the sagittal plane (represented by axis Y lying in the sagittal plane in FIG. 1) when engaged with the upper and lower vertebrae. Thesagittal plate 22 includes ananterior edge 30, aposterior edge 32, acaudal edge 34 and acephalad edge 36. It is understood that reference to anatomical directions in this specification such as sagittal, anterior, posterior, caudal and cephalad is for purposes of descriptive clarity only, and is not intended to limit theprosthetic device 20 to having a specific orientation relative to such anatomical directions. - The caudal and
cephalad edges sagittal plate 22 are formed as keel-like structures, which aid in the insertion of theprosthetic device 20 into the intervertebral space S. For example, in one embodiment, thecaudal edge 34 of thesagittal plate 22 is beveled at the posterior portion thereof to provide a sharp,forward edge 38 with which to pierce the vertebral body V2 upon insertion of theprosthetic device 20. In a like manner, thecephalad edge 36 of thesagittal plate 22 is beveled at the posterior portion thereof to provide a sharp,forward edge 39 with which to pierce the vertebral body V1 upon insertion of theprosthetic device 20. - It should be understood that other shapes and orientations of the caudal and
cephalad edges cephalad edges vascular structure 12, or other obstacles, that may be in place during insertion of theprosthetic device 20. Also, the caudal and cephalad edges 34, 36 may be angled, tapered, or configured in some other shape to facilitate the functional demands of insertion. In still another embodiment, such as the one depicted in FIG. 3b, the caudal and cephalad edges 34, 36 may be configured as having winged portions, including atransverse portion edge - Referring again to FIGS. 2 and 3a, the
sagittal plate 22 is adapted to promote fusion between the vertebral bodies V1, V2 (FIG. 1), and as such, in one embodiment, a plurality ofopenings 40 are defined through the sagittal plate to promote fusion therethrough. It should be understood that any number ofopenings 40 may be defined through thesagittal plate 22, including a single opening or two or more openings. It should also be understood that theopenings 40 need not necessarily extend entirely through thesagittal plate 22, but may alternatively extend partially therethrough. It should further be understood that thesagittal plate 22 need not necessarily define anyopenings 40 extending either partially or entirely therethrough. Additionally, although theopenings 40 are illustrated as having a circular configuration, it should be understood that other sizes and configurations of theopenings 40 are also contemplated. - To further promote fusion, the
sagittal plate 22 is preferably coated with a bone-growth promoting substance, such as, for example, a hydroxyapatite coating formed of calcium phosphate. Additionally, thesagittal plate 22 may be roughened prior to being coated with the bone-growth promoting substance to further enhance bone on-growth. Such surface roughening may be accomplished by way of, for example, acid etching, knurling, application of a bead coating, or other methods of roughening that would occur to one of ordinary skill in the art. - The
sagittal plate 22 may include one or more notches (not shown) or other types of indicia for receiving or engaging with a corresponding portion of a surgical instrument (not shown) to aid in the manipulation and insertion of theprosthetic device 20 within the intervertebral space S (FIG. 1) between the adjacent vertebral bodies V1, V2 (FIG. 1). The surgical instrument (not shown) is preferably configured to release thesagittal plate 22 once properly positioned between the adjacent vertebrae. One example of a surgical instrument that can be used to insert theprosthetic device 20 is described in co-pending application U.S. Ser. No. 10/430,473. - The
transverse plates surfaces transverse plates transverse plates sagittal plate 22 at a variety of angles relative to the sagittal plate, including at right angles. - As with the
sagittal plate 22, thetransverse plates openings 50 are defined through each of the transverse plates to promote fusion therethrough. It should be understood that any number ofopenings 50 may be defined through thetransverse plates openings 50 need not necessarily extend entirely through thetransverse plates transverse plates openings 50 extending either partially or entirely therethrough. Additionally, although theopenings 50 are illustrated as having a circular configuration, it should be understood that other sizes and configurations of theopenings 50 are also contemplated. - To further promote fusion, the
transverse plates transverse plates - Referring to FIGS. 4a and 4 b, the prosthetic device 20 (FIGS. 2 and 3) may be inserted into the space S between the vertebrae V1, V2 from a variety of approaches. For example, in operation, to accommodate insertion of the
prosthetic device 20, the vertebral bodies V1, V2 can be prepared to accept the prosthetic device therebetween from an offset longitudinal, or anterior-oblique, approach. Specifically, elongate openings orslots slots sagittal plate 22, and more specifically, to accommodate the caudal and cephalad edges 34, 36 defined on the sagittal plate. In one embodiment, theelongate slots slots prosthetic device 20, the caudal and cephalad edges 34, 36 can form their own corresponding slots by engagement and impaction of thebeveled edges - As is readily apparent from FIG. 4b, upon insertion into the intervertebral space S defined between the vertebrae V1, V2, the
prosthetic device 20 is completely disposed within the intervertebral space S such that no portion of the prosthetic device extends beyond the anterior or posterior portion of the vertebrae V1, V2. Moreover, no plating external of the intervertebral space S is required upon insertion of theprosthetic device 20, which is advantageous in avoiding the problems associated with contacting thevascular structure 12. In addition, the disposition of theprosthetic device 20 in the intervertebral space S results in a relatively large graft area between the vertebrae V1, V2, the graft area being defined, in one embodiment, by that portion of the intervertebral space S not occupied by theprosthetic device 20. As such, bone grafts (not shown) may be inserted into the graft area between the vertebrae V1, V2 to encourage fusion between the vertebrae. Moreover, although not required, supplemental screws (not shown) may be impacted into the vertebrae V1, V2 to provide additional support. Such screws, however, can be press-fit completely into the vertebrae V1, V2 such that no portion of the screws extends beyond the anterior or posterior portion of the vertebrae V1, V2. - Referring now to FIGS. 5a and 5 b, in another embodiment, a
prosthetic device 70 may be laterally inserted into an intervertebral space S′ defined between an upper vertebra V1′ and a lower vertebra V2′. In this embodiment, the upper and lower vertebrae V1′, V2′ are substantially parallel to one another, and as such, theprosthetic device 70 includes a pair oftransverse plates 72, 74, which are substantially parallel to one another and are substantially perpendicular to an associated sagittal plate 76. - To accommodate insertion of the
prosthetic device 70, the vertebral bodies V1ζ, V2′ can be prepared to accept the prosthetic device therebetween from the lateral approach by laterally forming elongate openings orslots slots elongate slots slots prosthetic device 20, theprosthetic device 70 may be configured to form their own corresponding slots by engagement and impaction with the vertebrae V1, V2, and thus no preformed slots are necessary. - The present disclosure has been described relative to several preferred embodiments. Improvements or modifications that become apparent to persons of ordinary skill in the art after reading this disclosure are deemed within the spirit and scope of the application. For example, although described with respect to circumventing
vascular structure 12, it is understood that the above-describedprosthetic device 20 may be desirable for use in scenarios wherevascular structure 12 is not present. Moreover, although described with respect to longitudinal and lateral insertion, it is understood that theprosthetic device 20 may be inserted into the intervertebral space S from a variety of other approaches such as the transforaminal approach. Accordingly, it is understood that several modifications, changes and substitutions are intended in the foregoing disclosure and, in some instances, some features of the disclosure will be employed without a corresponding use of other features. It is also understood that all spatial references, such as “longitudinal,” “lateral,” and “transverse,” are for illustrative purposes only and can be varied within the scope of the disclosure. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the scope of the disclosure.
Claims (22)
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