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Modulus plating system and method

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Publication number
US20030187509A1
US20030187509A1 US10405132 US40513203A US2003187509A1 US 20030187509 A1 US20030187509 A1 US 20030187509A1 US 10405132 US10405132 US 10405132 US 40513203 A US40513203 A US 40513203A US 2003187509 A1 US2003187509 A1 US 2003187509A1
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Prior art keywords
plate
vertebra
plates
system
cervical
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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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US10405132
Inventor
G. Lemole
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Zimmer Biomet Spine Inc
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Lemole G. Michael
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7059Cortical plates
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7044Screws or hooks combined with longitudinal elements which do not contact vertebrae also having plates, staples or washers bearing on the vertebrae
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8004Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with means for extending or compressing the bone or bones
    • A61B17/8009Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with means for extending or compressing the bone or bones the plate having a ratchet
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/44Joints for the spine, e.g. vertebrae, spinal discs
    • A61F2/442Intervertebral or spinal discs, e.g. resilient
    • A61F2/4425Intervertebral or spinal discs, e.g. resilient made of articulated components
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30576Special structural features of bone or joint prostheses not otherwise provided for with extending fixation tabs

Abstract

In one embodiment, a modular system for cervical fixation is disclosed. The system comprises a first plate operable to be attached to a first vertebra and a second plate operable to be attached to a second vertebra. A fixation means for connecting the first v-plate to the second v-plate is provided. The fixation means can be any one of a number of devices including a pair of beams that connect to the first and second plate, an attachment plate that attaches the first and second plates and an attachment plate that has an elastic middle portion.

Description

    CROSS REFERENCE TO RELATED APPLICATIONS
  • [0001]
    This application claims priority to U.S. Provisional Patent Application 60/369,245, filed on Apr. 1, 2002.
  • TECHNICAL FIELD OF THE INVENTION
  • [0002]
    This invention relates to medical devices and more specifically to a modulus plating system and method.
  • BACKGROUND OF THE INVENTION
  • [0003]
    Surgery for anterior cervical discectomy is performed with the patient lying on his or her back. A small incision is made in the front of the neck, to one side. After fat and muscle are pulled aside with a retractor, the disc is exposed between the vertebrae. An operating microscope may be used as part of the disc is removed with a forceps. Specialized instruments or a surgical drill may be used to enlarge the disc space. This will help the surgeon to empty the disc space fully and relieve any pressure on the nerve or spinal cord from bone spurs or the ruptured disc. If a bone graft is used, it will be placed in the disc space to help fuse the vertebrae it lies between. Any of several graft shapes may be used. In most cases, a cervical plate is applied to the cervical bodies surrounding the disc that was operated on. These cervical plates are one-piece plates that span one or more cervical bodies. An exemplary cervical plate is shown in FIG. 1. In the plate of FIG. 1, in use one end of cervical plate 1 is fixed to a vertebra and the other end of the cortical plate is attached to a second vertebra. One of the goals of a cervical plate is to improve initial stability in the post-operative period in order to decrease the need for wearing a cervical collar and result in a faster return to normal activities. In addition, anterior cervical plate fixation can potentially decrease the complications of graft dislocation, end plate fracture, and late kyphotic collapse. The operation is completed when the neck incision is closed in several layers. Unless dissolving suture material is used, the skin sutures (stitches) or staples will have to be removed after the incision has healed.
  • [0004]
    One of the drawbacks of current cervical plates and cervical plating system is that they are designed in one-piece units and may not always adaptable to cervical vertebra bodies of different sizes. Additionally, in certain designs, the bone screw that secures the plate to the cervical body can back out of the cervical body over time, loosening the cervical plates. Also, current cervical plates can only be applied at the end of surgery limiting their usefulness during the decompression and disc evacuation.
  • SUMMARY OF THE INVENTION
  • [0005]
    Thus a need has arisen for a modular plating system that overcomes a drawback of present cervical plating schemes. In the present invention, the cervical plate is a modular system consisting of at least two vertebra plates (v-plates) that attach to the vertebra body and a connecting plate that is mounted over and is attached to the v-plates.
  • [0006]
    In one embodiment, a modular system for cervical fixation is disclosed. The system comprises a first plate operable to be attached to a first vertebra and a second plate operable to be attached to a second vertebra. A fixation means for connecting the first v-plate to the second v-plate is provided. The fixation means can be any one of a number of devices including a pair of beams that connect to the first and second plate, an attachment plate that attaches the first and second plates and an attachment plate that has an elastic middle portion.
  • [0007]
    The present invention allows the use of one system to be used for any vertebral body size. Additionally, by mounting the v-plates early in the procedure, the v-plates can be used to anchor retractors and dissectors to aid in the discectomy procedure. Also, the attachment means for connecting plates are mounted over the v-plate, which helps to prevent the body screws of the v-plate from backing out. Additionally, a variable tension connector can be used to maintain tension between v-plates. A system for using talon shaped attachment means is also disclosed which provides benefits over current attachment means such as screws. A novel artificial disc system is disclosed, which provides for better disc replacement surgeries. Other technical benefits will be apparent from the description of the invention and appended claims.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0008]
    Non-limiting and non-exhaustive preferred embodiments of the present invention are described herein, with like numbers indicating like parts and where:
  • [0009]
    [0009]FIG. 1 is an illustration of a conventional vertebra plate;
  • [0010]
    [0010]FIG. 2 is an illustration of a vertebral body plate (v-plate) in accordance with the teachings of the present invention;
  • [0011]
    [0011]FIG. 3 is a drawing of a v-plate attached to a vertebra;
  • [0012]
    [0012]FIG. 4 is an illustration of the v-plate used to secure retractors and distractors;
  • [0013]
    [0013]FIG. 5 is an embodiment of FIG. 3 with an I-beam attached to each v-plate;
  • [0014]
    [0014]FIG. 6 is a detailed view of a modulus plate with an I-beam attached;
  • [0015]
    [0015]FIG. 7 is an illustration of an I-plate;
  • [0016]
    [0016]FIG. 8 is a drawing of an I-plate attached to two v-plates;
  • [0017]
    [0017]FIG. 9A is a drawing of an elastic I-plate attached to vertebra;
  • [0018]
    [0018]FIG. 9B is a side view of the elastic I-beam;
  • [0019]
    [0019]FIG. 10 illustrates a novel attachment system (talon);
  • [0020]
    [0020]FIG. 11 illustrates the talons as deployed in a vertebra body, securing a cervical plate;
  • [0021]
    [0021]FIG. 12 illustrates an embodiment of the v-plate used in conjunction with an disc; and
  • [0022]
    [0022]FIG. 13 is a flow chart illustrating a method of using the modular plating system in anterior cervical discectomy.
  • DETAILED DESCRIPTION OF THE DRAWINGS
  • [0023]
    This invention relates to components for use in a modulus plating system for cervical fixation. The system uses two or more v-plates, each of which is attached to a vertebra. After a surgical procedure is performed, the v-plates can be coupled in one of several ways to hold the vertebra together. However, the present invention is not limited solely to cervical fixation and can be applied to other spinal fixation system such as thoracic fixation, lumbar fixation, and possibly other applications such as appendicular skeleton applications and cranium applications. Thus, while the invention may be discussed primarily with regard to cervical fixation the inventive concepts are not limited to such.
  • [0024]
    [0024]FIG. 2 illustrates a vertebra body plate (v-plate) 10 in accordance with the teachings of the present invention. V-plate 10 is typically a one-piece plate that is generally oval in shape, although the exact shape and size of the v-plate 10 is unimportant as long as v-plate 10 can fit on to and secure on to a vertebra. V-plate 10 has a fixed thickness that depends on the choice of material and is chose based on the strength needed to firmly attached to the vertebra and support a fixation device in a system designed to connect to vertebra. V-plate 10 includes a body portion 12 having a first screw hole 16 and a second screw hole 20. Body screw 25, not pictured, is inserted through screw hole 16 and 20 to fix v-plate 10 to a vertebra and the like. While two screw holes are shown in FIG. 2, any number of screw holes may be used. Also, screw holes 16 and 20 can also be used as openings for bolts or other means to fix the v-plate to a bone.
  • [0025]
    V-plate 10 can be fabricated from-a metal or metal alloy such as titanium or any other suitable material including radio-opaque carbon fiber constructs. The v-plate 10 can also be fabricated from a bio-absorbable material that can be absorbed back by the body. In a typical embodiment the v-plate 10 is approximately oval in shape and can be contoured such that the v-plate 10 will match the shape of the anterior vertebral body to which it is affixed. In one embodiment, bone screws (not pictured) are inserted into screw hole 16 and 20 to fix the v-plate 10 to the vertebral body. The screw holes may be fixed trajectory screw holes. Alternatively, any other fastening means known in the art can be used. V-plate 10 can also includes an interface (not pictured) for the fixation of an I-plate 50 or I-beams 30 as described in detail in FIGS. 5 through 9b. The use of a screw locking mechanism such as a locking washer or additional screws would typically not be necessary in the present invention because the I-plate 50 or I-beams 30 as described further in FIGS. 5 through 9b would at least partially cover the screws attaching the v-plate 10 to the vertebral body, thus preventing screw back out.
  • [0026]
    Two v-plates 10 are illustrated attached to two different cervical vertebra bodies 24 using body screws 25 in FIG. 3. Illustrated between the cervical vertebra bodies 24 is a disc 26. Unlike prior art vertebra plates, the v-plates 10 are installed prior to operating on the disc. The v-plates 10 can be used during surgery to help secure body structures.
  • [0027]
    [0027]FIG. 4 illustrates two v-plates 10 attached to vertebra bodies 24 on two discs 26. Retractor arms 29 can be attached to retractor arm anchor points 31 formed on the v-plate 10. The retractor arm anchor points 31 may be part of the screw holes of v-plate 10 or may be a separate structure on v-plate 10. Anchor points 31 can be any structure formed on v-plate that allows the retractor to be solidly mounted. The retractor arms 29 can be used during surgery to hold vital tissues such as the esophagus, the carotid artery and the trachea out of the way when the surgeon operates on the disc. This is advantageous because an additional person with manual retractors or a separate retractor system is not needed. Additionally, a ratcheting system 33 can be attached to the retractor arms 29. The ratcheting system 33 can be adjusting in a conventional manner in order to separate (distract) the cervical vertebra body for access to the disc 26. At the end of the procedure a fixation means is used to connect the two v-plates 10. While any, structure that connects the two or more v-plates can be used as a fixation means, various embodiments of such fixation means are illustrated in FIG. 5 through FIG. 9b.
  • [0028]
    [0028]FIG. 5 illustrates two v-plates 10 attached to cervical vertebra 24 with an I-beam fixing the v-plates 10. In a typical embodiment, two I-beams 30 are typically used to fix the v-plates 10 in place after graft is placed between vertebra bodies 24. In this illustration only one I-beam is shown attached to one side of v-plate 10 for simplification purpose, typically an I-beam is be placed on either side of v-plate 10 parallel to each other to enhance stability. I-beam 30 is generally a straight piece of metal such as titanium. I-beam 30 can be fastened directly on top of v-plates 10 using a screw or other fastening device. Typically, I-beam 30 will attach to v-plate 20 using a locking screw 40 or similar structures. I-beam 30 is designed to at least partially block the screws or other structure attaching the v-plate 10 to the vertebra body 24. This prevents the screws from baking out. Typically I-beam 30 is constructed of titanium or other rigid materials.
  • [0029]
    [0029]FIG. 6 illustrates the I-beam 30 as shown in FIG. 5 attached to a single v-plate 10 with a lock screw 40. In this embodiment I-beam 30 is inserted through a channel 35 formed on v-plate 10. A grove 41 of I-beam 30 is mated with the channel 35 and the I-beam 30 can be inserted through the channel 35. A locking screw or similar structure is then used to fix I-beam 30 to v-plate 10. Again, for simplicity, only one I-beam 30 is shown installed, typically I-beam 30 is installed in pairs with an I-beam 30 on either side of v-plate 10. Alternatively, the I-beam 30 could attach directly on top of v-plate 10, with the use of a locking screw 40.
  • [0030]
    [0030]FIG. 7 illustrates a novel I-plate 50 for connecting v-plates 10 in accordance with the teachings of the present invention. I-plate 50 is a single structure designed to be mounted along the center of v-plate 10 as opposed to the I-beam 30, which is designed to be mounted along the side of v-plate 10. I-plate 50 can be constructed from titanium or any suitable material such as those used for v-plate 10. In one embodiment, I-plate 50 has a series of indentations 52 along each side for receiving a locking screw to help attach the I-plate to the v-plate 10 as seen in FIG. 8. In one embodiment, the radius of curvature of the indentations is greater than the radius of curvature of the screws or other structure used to attach the I-plate 50. This allows for the I-plate 50 to be angulated and adjusted to get the best fit between the I-plate 50 and v-plate 10. Two v-plates 10 along with I-plate 50 form the modulus plating system for a cervical level.
  • [0031]
    [0031]FIG. 8 illustrates I-plate 50 attached to two v-plates 10 which in turn are attached to vertebra 24 with disc 26 between the two vertebras. As seen in FIG. 8, I-plate 50 is attached to the v-plate 10 with locking screws 62 and 64. Alternatively, I-plate 50 can be attached using a conventional ratchet/cam system, as is well known in the art. I-plate 50 is designed to cover a large portion of the central part of v-plate 10. Locking screw 62 and 64 may be referenced to existing screws and/or sockets on the v-plate 10 or a variable ratchet and cam system can be used to attach I-plate 50 to each v-plate 10. I-plate 50 is designed to cover at least a portion of the screws or other structures used to secure v-plate 10 to prevent screw back out. Once the I-plate 50 is attached to the v-plates 10 the cervical fusion fixation is complete and traditional radiography or fluoroscopy can verify placement and alignment. I-plate 50 may also include one or more optional openings 66 placed such that any surgical grafts can be visualized while I-plate 50 is being applied.
  • [0032]
    [0032]FIG. 9A is a variable tension plate 70 in accordance with the teachings of the present invention. FIG. 9A illustrates variable tension plate 70 including locking screw 73 and elastic area 72. Variable tension plate 70, as illustrated in FIG. 9a and 9 b, includes a top portion 74 and a bottom portion 76. A connection bar 75, which is a sliding structure comprising groves in one embodiment, connects top portion 74 and bottom portion 76. Part of connection bar 75 is attached to top portion 74 and part to bottom portion 76. Other means for allowing connection bar to expand and contract with the expanding and contraction of variable tension plate 70 can be used. The connection bar 75 limits the contraction of variable tension plate 70 while the elasticity of the elastic area limits the stretching of variable tension plate 70
  • [0033]
    Elastic area 72 formed from an elastic polymer or other elastic means such as springs to maintain tension between the plates. As the elastic interface is stretched, tension between the plates increases. Elastic means 72 can be designed to either maintain constant tension across the graft interface or to produce a variable tension on the graft depending on how far apart the top portion 74 and bottom portion 76 of variable tension plate 70 are stretched. The elastic polymer or springs means can also be encased within the plate, applied over the plate either laterally or medially, or fixed in some other fashion as would be well known in the art. The advantage of this system is that traditional stresses that exist at a variable angle screw interface in the bone would shift to a bone hardware interface with a variable tension applied over the hardware. The decreased sheer forces at the screw plate in the interface helps to prevent hardware breakage. Additionally the elasticity of the variable tension plate 70 can be used to maintain graft compression over a wide range of tensions and distractions. Alternatively, multi-level variable tension plates 70 could be utilized so that each level of cervical fixations could have its own distraction/tension between two vertebra bodies. FIG. 9B is a side view of the present invention illustrating two parts of the metal I-plates 74 and 76 held together by the elastic area 72. While this represents one possible cross section of elastic plate 70 others would be known to one skilled in the art.
  • [0034]
    [0034]FIG. 10 illustrates a novel attachment system that can be used with v-plate 10 in the present invention. Illustrated are two talons 80 which are inserted through a cervical plate 82 using guide holes 84. Titanium plate 82 may be the v-plate 10. In one embodiment talons 80 are sharp, pointed, curved nails manufactured of titanium that have a decreasing diameter from an end 81 to a tip 83. The tip 83 of the talon 80 is designed to be sharp enough to accelerate into a bone without fracturing the vertebra body. In a typical embodiment talons 80 are applied to either side of a cervical plate 82 into the vertebral body. One talon may have a slight rostral bend and the other a caudal curve. This ensures that each one would move into the body without hitting each other on the way in. Once deployed into the vertebra body the shape of the talons 80 helps to resist pull out force as opposed to traditional screws that resist pull out force solely on the grip between the grooves of the screw and bone mass. The talons 80 may be locked in the place using locking screws or washers or, in present invention, covered by an I-beam 30 or I-plate 50 or variable tension plate 70. In one embodiment the talons 80 may be applied using a modified air gun. In one embodiment, an air gun can be modified to both place the cervical plate 82 and deploy the talons 80 in one operation. By sizing the talon 80 such that they are not long enough to either threaten to impinge on the spinal cord or vertebral arteries, safety is enhanced. In one embodiment, screw threads could be placed into the ends of the talon to facilitate pull out in case the construct has to be removed. FIG. 11 illustrates the talons as deployed in a vertebra body 24, securing a cervical plate 82.
  • [0035]
    [0035]FIG. 12 illustrates an embodiment of the v-plate 10 used in conjunction with an artificial disc. One problem with current artificial disc is that they require a means to fix the artificial disc to adjacent vertebra and plates and across disc space until the artificial disc is incorporated into the adjacent vertebral level. As illustrated in FIG. 12 this can be accomplished by using the v-plates 10 of the present invention with L-plates 100 mounted over them. In one embodiment the L-plate 100 is a right angle plate that affixes through the v-plate 10 using a screwing system or a ratchet and cam system. A first leg 101 of the L-plate 100 attaches to the v-plate 10 in the vertebra body face while a second leg 103, at essentially a right angle to first leg 101 and adjacent to the vertebra body, secures to an artificial disc 102. Another L-plate 100 is mounted onto the other vertebra body 24 to also secure the artificial disc. This helps induce fusion of the disc. In this embodiment L-plate 100 can be made from a bio-absorbable material that could include osteogenic or osteoinductive compounds to help induce integration of the L-plate 100 into the vertebra itself. In one embodiment, a complete artificial disc structure comprising two L-plates 100 with an artificial disc mounted between them can be provided. In another embodiment, the artificial disc can be inserted separately between the vertebra and the L-plates inserted in such way that the second leg 103 of the L-plate 100 will attach to the artificial disc. In one embodiment, this can be accomplished using a prong type structure on the second leg of the L-plate 100.
  • [0036]
    [0036]FIG. 13 is a flow chart illustrating a method of using the modular plating system in an anterior cervical discectomy. In a first step 110 a small incision is made in the front of the neck, to one side. Next, in step 112, fat and muscle are pulled aside with a retractor, the disc is exposed between the vertebras. In a next step 1 14, the v-plates 10 are secured to the vertebral bodies of each level to be fixated. This is different then current methods employing vertebra plates that are not secured until the end of the operation. Next, in step 116, the discectomy is completed. Part of the disc is removed and specialized instruments or a surgical drill may be used to enlarge the disc space. This will help the surgeon to empty the disc space fully and relieve any pressure on the nerve or spinal cord from bone spurs or the ruptured disc. If a bone graft is used, it is placed in the disc space to help fuse the vertebrae it lies between. Any of several graft shapes may be used. After the graft is in place, cervical alignment is optimized and adequate compression is applied. During the operation, retractors can be attached to the v-plate to hold body structure such as the esophagus. Then, in step 118, the I-plate (or I-beam 30, variable tension plate 70 or similar structure) is locked to the v-plates 10 at each level. If necessary, traditional radiography or fluoroscopy can be used to verify hardware placement and cervical alignment. In step 120, the neck incision is closed in several layers. Unless dissolving suture material is used, the skin sutures (stitches) or staples will have to be removed after the incision has healed.
  • [0037]
    Having now described preferred embodiments of the invention modifications and variations may occur to those skilled in the art. The invention is thus not limited to the preferred embodiments, but is instead set forth in the following clauses and legal equivalents thereof. For example, although the discussions only disclosed the use of the present invention for attaching of two vertebras together, multiple vertebras can be connected without departing from the scope of the present invention.

Claims (22)

What is claimed:
1. A modular system for cervical fixation comprising:
a first plate operable to be attached to a first vertebra;
a second plate operable to be attached to a second vertebra; and
a fixation means for connecting the first v-plate to the second v-plate.
2. The system of claim 1 wherein the fixation means is one or more I-beams, each I-beam comprising an elongated structure operable to span from the first plate to the second plate, each I-beam anchoring a same side of the first plate and the second plate.
3. The system of claim 1 wherein the fixation means is an I-plate, the I-plate comprising a single piece structure operable to span from the first plate to the second plate, the I-plate anchored to the first plate at a first end of the I-plate by an anchoring means and anchored to the second plate at a second end of the I-plate.
4. The system of claim 3wherein the I-plate includes one or more openings through the I-plate to allow for visual access to the area below the I-plate once the I-plate is installed.
5. The system of claim 1 wherein a retractor is attached to the first plate and the second plate.
6. The system of claim 5 wherein a ratcheting system can be attached to the retractor to allow for manual separation or contraction of the first vertebra and the second vertebra.
5. The system of claim 1 wherein one or more additional plates are attached to one or more vertebra and all of the plates are attached by a fixation means.
6 The system of claim 1, wherein the first plates and second plates are attached to the first vertebra and the second vertebra using a curved talon, the talons having a pointed end that inserts in to the bone and a second end that secures the first plate and second plate to the first and second vertebra.
7. The system of claim 1 wherein the fixation means comprises a variable tension plate, the variable tension plate comprising a first end operable to attach to the first plate, a second end operable to attach to the second plate and an elastic middle portion connecting the first end to the second end.
8. The system of claim 1 wherein the fixation means comprises a first L-plate having a first portion attaching to the first plate and a second portion formed at essentially a right angle to the first portion and contact a portion of the first vertebra and a second L-plate having a first portion attaching to the second plate and a second portion formed at essentially a right angle to the first portion and contact a portion of the second vertebra, an artificial disc material sandwiched between the second portion of the first L-plate and the second portion of the second L-plate.
9. The system of claim 1, wherein the system is used in anterior cervical spine operations.
10. The system of claim wherein the I-plate includes a plurality of indentations formed along each side, the plurality of indentations having a radius of curvature greater than the head of the fastening device used to affix the I-plate to the first plate and the second plate, the indentations allowing for adjustment of the I-plate as it attaches to the first plate and second plate.
11. The system of claim 8 wherein the L-plate and the artificial disk material are manufactured from bio-absorbable materials.
12. The system of claim 1 wherein the first plate is attached to the first vertebra by one or more screws and the second plate is attached to the second vertebra by one or more screws.
13. The system of claim 1 wherein the attachment means covers at least part of the one or more screws used to attach the first plate and the one or more screws used to attached the second plate.
14. An apparatus for attaching a structure to a bone comprising curved talons, having a first pointed end for insertion into bone and a second end to apply pressure to in order to insert the talon into the bone.
15. The apparatus of claim 14 wherein two talons are inserted into the structure along the same line, each of the two talons curved in relation to the other to prevent the talons from impinging on each other when inserted.
16. The apparatus of claim 14 where in the structure is a vertebra plate and the bone is a vertebra body.
17. The apparatus of claim 14 wherein the talons are inserted using an air gun.
18. An artificial disc for use in replacing an injured or degenerated disc in the human body comprising:
a first L-plate having a first leg for attaching to a first vertebra and a second leg at essentially a right angle to the first leg,
a second L-plate having a first leg for attaching to a second vertebra and a second leg at essentially a right angle to the first leg, and
artificial disc material deposited between the second leg of the first L-plate and the second leg of the second L-plate having the between them.
19. The artificial disc of claim 18 wherein the artificial disc material is initially connected to either the first L-plate or the second L-plate.
20. The artificial disk of claim 18 wherein the first L-plate is mounted over a first plate attached to a first vertebra and the second L-plate is mounted to a second plate attached to a second vertebra.
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